diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 6326 |
1 files changed, 6326 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c new file mode 100644 index 000000000..6ba68dd61 --- /dev/null +++ b/arch/powerpc/kvm/book3s_hv.c @@ -0,0 +1,6326 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> + * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. + * + * Authors: + * Paul Mackerras <paulus@au1.ibm.com> + * Alexander Graf <agraf@suse.de> + * Kevin Wolf <mail@kevin-wolf.de> + * + * Description: KVM functions specific to running on Book 3S + * processors in hypervisor mode (specifically POWER7 and later). + * + * This file is derived from arch/powerpc/kvm/book3s.c, + * by Alexander Graf <agraf@suse.de>. + */ + +#include <linux/kvm_host.h> +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/preempt.h> +#include <linux/sched/signal.h> +#include <linux/sched/stat.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/anon_inodes.h> +#include <linux/cpu.h> +#include <linux/cpumask.h> +#include <linux/spinlock.h> +#include <linux/page-flags.h> +#include <linux/srcu.h> +#include <linux/miscdevice.h> +#include <linux/debugfs.h> +#include <linux/gfp.h> +#include <linux/vmalloc.h> +#include <linux/highmem.h> +#include <linux/hugetlb.h> +#include <linux/kvm_irqfd.h> +#include <linux/irqbypass.h> +#include <linux/module.h> +#include <linux/compiler.h> +#include <linux/of.h> +#include <linux/irqdomain.h> + +#include <asm/ftrace.h> +#include <asm/reg.h> +#include <asm/ppc-opcode.h> +#include <asm/asm-prototypes.h> +#include <asm/archrandom.h> +#include <asm/debug.h> +#include <asm/disassemble.h> +#include <asm/cputable.h> +#include <asm/cacheflush.h> +#include <linux/uaccess.h> +#include <asm/interrupt.h> +#include <asm/io.h> +#include <asm/kvm_ppc.h> +#include <asm/kvm_book3s.h> +#include <asm/mmu_context.h> +#include <asm/lppaca.h> +#include <asm/pmc.h> +#include <asm/processor.h> +#include <asm/cputhreads.h> +#include <asm/page.h> +#include <asm/hvcall.h> +#include <asm/switch_to.h> +#include <asm/smp.h> +#include <asm/dbell.h> +#include <asm/hmi.h> +#include <asm/pnv-pci.h> +#include <asm/mmu.h> +#include <asm/opal.h> +#include <asm/xics.h> +#include <asm/xive.h> +#include <asm/hw_breakpoint.h> +#include <asm/kvm_book3s_uvmem.h> +#include <asm/ultravisor.h> +#include <asm/dtl.h> +#include <asm/plpar_wrappers.h> + +#include "book3s.h" +#include "book3s_hv.h" + +#define CREATE_TRACE_POINTS +#include "trace_hv.h" + +/* #define EXIT_DEBUG */ +/* #define EXIT_DEBUG_SIMPLE */ +/* #define EXIT_DEBUG_INT */ + +/* Used to indicate that a guest page fault needs to be handled */ +#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) +/* Used to indicate that a guest passthrough interrupt needs to be handled */ +#define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) + +/* Used as a "null" value for timebase values */ +#define TB_NIL (~(u64)0) + +static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); + +static int dynamic_mt_modes = 6; +module_param(dynamic_mt_modes, int, 0644); +MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); +static int target_smt_mode; +module_param(target_smt_mode, int, 0644); +MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); + +static bool one_vm_per_core; +module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)"); + +#ifdef CONFIG_KVM_XICS +static const struct kernel_param_ops module_param_ops = { + .set = param_set_int, + .get = param_get_int, +}; + +module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); +MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); + +module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); +MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); +#endif + +/* If set, guests are allowed to create and control nested guests */ +static bool nested = true; +module_param(nested, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); + +static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); + +/* + * RWMR values for POWER8. These control the rate at which PURR + * and SPURR count and should be set according to the number of + * online threads in the vcore being run. + */ +#define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL +#define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL +#define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL +#define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL +#define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL +#define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL +#define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL +#define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL + +static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { + RWMR_RPA_P8_1THREAD, + RWMR_RPA_P8_1THREAD, + RWMR_RPA_P8_2THREAD, + RWMR_RPA_P8_3THREAD, + RWMR_RPA_P8_4THREAD, + RWMR_RPA_P8_5THREAD, + RWMR_RPA_P8_6THREAD, + RWMR_RPA_P8_7THREAD, + RWMR_RPA_P8_8THREAD, +}; + +static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, + int *ip) +{ + int i = *ip; + struct kvm_vcpu *vcpu; + + while (++i < MAX_SMT_THREADS) { + vcpu = READ_ONCE(vc->runnable_threads[i]); + if (vcpu) { + *ip = i; + return vcpu; + } + } + return NULL; +} + +/* Used to traverse the list of runnable threads for a given vcore */ +#define for_each_runnable_thread(i, vcpu, vc) \ + for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) + +static bool kvmppc_ipi_thread(int cpu) +{ + unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); + + /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ + if (kvmhv_on_pseries()) + return false; + + /* On POWER9 we can use msgsnd to IPI any cpu */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + msg |= get_hard_smp_processor_id(cpu); + smp_mb(); + __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); + return true; + } + + /* On POWER8 for IPIs to threads in the same core, use msgsnd */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) { + preempt_disable(); + if (cpu_first_thread_sibling(cpu) == + cpu_first_thread_sibling(smp_processor_id())) { + msg |= cpu_thread_in_core(cpu); + smp_mb(); + __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); + preempt_enable(); + return true; + } + preempt_enable(); + } + +#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) + if (cpu >= 0 && cpu < nr_cpu_ids) { + if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { + xics_wake_cpu(cpu); + return true; + } + opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); + return true; + } +#endif + + return false; +} + +static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) +{ + int cpu; + struct rcuwait *waitp; + + /* + * rcuwait_wake_up contains smp_mb() which orders prior stores that + * create pending work vs below loads of cpu fields. The other side + * is the barrier in vcpu run that orders setting the cpu fields vs + * testing for pending work. + */ + + waitp = kvm_arch_vcpu_get_wait(vcpu); + if (rcuwait_wake_up(waitp)) + ++vcpu->stat.generic.halt_wakeup; + + cpu = READ_ONCE(vcpu->arch.thread_cpu); + if (cpu >= 0 && kvmppc_ipi_thread(cpu)) + return; + + /* CPU points to the first thread of the core */ + cpu = vcpu->cpu; + if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) + smp_send_reschedule(cpu); +} + +/* + * We use the vcpu_load/put functions to measure stolen time. + * + * Stolen time is counted as time when either the vcpu is able to + * run as part of a virtual core, but the task running the vcore + * is preempted or sleeping, or when the vcpu needs something done + * in the kernel by the task running the vcpu, but that task is + * preempted or sleeping. Those two things have to be counted + * separately, since one of the vcpu tasks will take on the job + * of running the core, and the other vcpu tasks in the vcore will + * sleep waiting for it to do that, but that sleep shouldn't count + * as stolen time. + * + * Hence we accumulate stolen time when the vcpu can run as part of + * a vcore using vc->stolen_tb, and the stolen time when the vcpu + * needs its task to do other things in the kernel (for example, + * service a page fault) in busy_stolen. We don't accumulate + * stolen time for a vcore when it is inactive, or for a vcpu + * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of + * a misnomer; it means that the vcpu task is not executing in + * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in + * the kernel. We don't have any way of dividing up that time + * between time that the vcpu is genuinely stopped, time that + * the task is actively working on behalf of the vcpu, and time + * that the task is preempted, so we don't count any of it as + * stolen. + * + * Updates to busy_stolen are protected by arch.tbacct_lock; + * updates to vc->stolen_tb are protected by the vcore->stoltb_lock + * lock. The stolen times are measured in units of timebase ticks. + * (Note that the != TB_NIL checks below are purely defensive; + * they should never fail.) + * + * The POWER9 path is simpler, one vcpu per virtual core so the + * former case does not exist. If a vcpu is preempted when it is + * BUSY_IN_HOST and not ceded or otherwise blocked, then accumulate + * the stolen cycles in busy_stolen. RUNNING is not a preemptible + * state in the P9 path. + */ + +static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb) +{ + unsigned long flags; + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + spin_lock_irqsave(&vc->stoltb_lock, flags); + vc->preempt_tb = tb; + spin_unlock_irqrestore(&vc->stoltb_lock, flags); +} + +static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb) +{ + unsigned long flags; + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + spin_lock_irqsave(&vc->stoltb_lock, flags); + if (vc->preempt_tb != TB_NIL) { + vc->stolen_tb += tb - vc->preempt_tb; + vc->preempt_tb = TB_NIL; + } + spin_unlock_irqrestore(&vc->stoltb_lock, flags); +} + +static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long flags; + u64 now; + + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (vcpu->arch.busy_preempt != TB_NIL) { + WARN_ON_ONCE(vcpu->arch.state != KVMPPC_VCPU_BUSY_IN_HOST); + vc->stolen_tb += mftb() - vcpu->arch.busy_preempt; + vcpu->arch.busy_preempt = TB_NIL; + } + return; + } + + now = mftb(); + + /* + * We can test vc->runner without taking the vcore lock, + * because only this task ever sets vc->runner to this + * vcpu, and once it is set to this vcpu, only this task + * ever sets it to NULL. + */ + if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) + kvmppc_core_end_stolen(vc, now); + + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && + vcpu->arch.busy_preempt != TB_NIL) { + vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt; + vcpu->arch.busy_preempt = TB_NIL; + } + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); +} + +static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) +{ + struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long flags; + u64 now; + + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + /* + * In the P9 path, RUNNABLE is not preemptible + * (nor takes host interrupts) + */ + WARN_ON_ONCE(vcpu->arch.state == KVMPPC_VCPU_RUNNABLE); + /* + * Account stolen time when preempted while the vcpu task is + * running in the kernel (but not in qemu, which is INACTIVE). + */ + if (task_is_running(current) && + vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) + vcpu->arch.busy_preempt = mftb(); + return; + } + + now = mftb(); + + if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) + kvmppc_core_start_stolen(vc, now); + + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) + vcpu->arch.busy_preempt = now; + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); +} + +static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) +{ + vcpu->arch.pvr = pvr; +} + +/* Dummy value used in computing PCR value below */ +#define PCR_ARCH_31 (PCR_ARCH_300 << 1) + +static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) +{ + unsigned long host_pcr_bit = 0, guest_pcr_bit = 0; + struct kvmppc_vcore *vc = vcpu->arch.vcore; + + /* We can (emulate) our own architecture version and anything older */ + if (cpu_has_feature(CPU_FTR_ARCH_31)) + host_pcr_bit = PCR_ARCH_31; + else if (cpu_has_feature(CPU_FTR_ARCH_300)) + host_pcr_bit = PCR_ARCH_300; + else if (cpu_has_feature(CPU_FTR_ARCH_207S)) + host_pcr_bit = PCR_ARCH_207; + else if (cpu_has_feature(CPU_FTR_ARCH_206)) + host_pcr_bit = PCR_ARCH_206; + else + host_pcr_bit = PCR_ARCH_205; + + /* Determine lowest PCR bit needed to run guest in given PVR level */ + guest_pcr_bit = host_pcr_bit; + if (arch_compat) { + switch (arch_compat) { + case PVR_ARCH_205: + guest_pcr_bit = PCR_ARCH_205; + break; + case PVR_ARCH_206: + case PVR_ARCH_206p: + guest_pcr_bit = PCR_ARCH_206; + break; + case PVR_ARCH_207: + guest_pcr_bit = PCR_ARCH_207; + break; + case PVR_ARCH_300: + guest_pcr_bit = PCR_ARCH_300; + break; + case PVR_ARCH_31: + guest_pcr_bit = PCR_ARCH_31; + break; + default: + return -EINVAL; + } + } + + /* Check requested PCR bits don't exceed our capabilities */ + if (guest_pcr_bit > host_pcr_bit) + return -EINVAL; + + spin_lock(&vc->lock); + vc->arch_compat = arch_compat; + /* + * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit + * Also set all reserved PCR bits + */ + vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; + spin_unlock(&vc->lock); + + return 0; +} + +static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) +{ + int r; + + pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); + pr_err("pc = %.16lx msr = %.16llx trap = %x\n", + vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); + for (r = 0; r < 16; ++r) + pr_err("r%2d = %.16lx r%d = %.16lx\n", + r, kvmppc_get_gpr(vcpu, r), + r+16, kvmppc_get_gpr(vcpu, r+16)); + pr_err("ctr = %.16lx lr = %.16lx\n", + vcpu->arch.regs.ctr, vcpu->arch.regs.link); + pr_err("srr0 = %.16llx srr1 = %.16llx\n", + vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); + pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", + vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); + pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", + vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); + pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", + vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); + pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); + pr_err("fault dar = %.16lx dsisr = %.8x\n", + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); + pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); + for (r = 0; r < vcpu->arch.slb_max; ++r) + pr_err(" ESID = %.16llx VSID = %.16llx\n", + vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); + pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", + vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, + vcpu->arch.last_inst); +} + +static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) +{ + return kvm_get_vcpu_by_id(kvm, id); +} + +static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) +{ + vpa->__old_status |= LPPACA_OLD_SHARED_PROC; + vpa->yield_count = cpu_to_be32(1); +} + +static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, + unsigned long addr, unsigned long len) +{ + /* check address is cacheline aligned */ + if (addr & (L1_CACHE_BYTES - 1)) + return -EINVAL; + spin_lock(&vcpu->arch.vpa_update_lock); + if (v->next_gpa != addr || v->len != len) { + v->next_gpa = addr; + v->len = addr ? len : 0; + v->update_pending = 1; + } + spin_unlock(&vcpu->arch.vpa_update_lock); + return 0; +} + +/* Length for a per-processor buffer is passed in at offset 4 in the buffer */ +struct reg_vpa { + u32 dummy; + union { + __be16 hword; + __be32 word; + } length; +}; + +static int vpa_is_registered(struct kvmppc_vpa *vpap) +{ + if (vpap->update_pending) + return vpap->next_gpa != 0; + return vpap->pinned_addr != NULL; +} + +static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, + unsigned long flags, + unsigned long vcpuid, unsigned long vpa) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long len, nb; + void *va; + struct kvm_vcpu *tvcpu; + int err; + int subfunc; + struct kvmppc_vpa *vpap; + + tvcpu = kvmppc_find_vcpu(kvm, vcpuid); + if (!tvcpu) + return H_PARAMETER; + + subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; + if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || + subfunc == H_VPA_REG_SLB) { + /* Registering new area - address must be cache-line aligned */ + if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) + return H_PARAMETER; + + /* convert logical addr to kernel addr and read length */ + va = kvmppc_pin_guest_page(kvm, vpa, &nb); + if (va == NULL) + return H_PARAMETER; + if (subfunc == H_VPA_REG_VPA) + len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); + else + len = be32_to_cpu(((struct reg_vpa *)va)->length.word); + kvmppc_unpin_guest_page(kvm, va, vpa, false); + + /* Check length */ + if (len > nb || len < sizeof(struct reg_vpa)) + return H_PARAMETER; + } else { + vpa = 0; + len = 0; + } + + err = H_PARAMETER; + vpap = NULL; + spin_lock(&tvcpu->arch.vpa_update_lock); + + switch (subfunc) { + case H_VPA_REG_VPA: /* register VPA */ + /* + * The size of our lppaca is 1kB because of the way we align + * it for the guest to avoid crossing a 4kB boundary. We only + * use 640 bytes of the structure though, so we should accept + * clients that set a size of 640. + */ + BUILD_BUG_ON(sizeof(struct lppaca) != 640); + if (len < sizeof(struct lppaca)) + break; + vpap = &tvcpu->arch.vpa; + err = 0; + break; + + case H_VPA_REG_DTL: /* register DTL */ + if (len < sizeof(struct dtl_entry)) + break; + len -= len % sizeof(struct dtl_entry); + + /* Check that they have previously registered a VPA */ + err = H_RESOURCE; + if (!vpa_is_registered(&tvcpu->arch.vpa)) + break; + + vpap = &tvcpu->arch.dtl; + err = 0; + break; + + case H_VPA_REG_SLB: /* register SLB shadow buffer */ + /* Check that they have previously registered a VPA */ + err = H_RESOURCE; + if (!vpa_is_registered(&tvcpu->arch.vpa)) + break; + + vpap = &tvcpu->arch.slb_shadow; + err = 0; + break; + + case H_VPA_DEREG_VPA: /* deregister VPA */ + /* Check they don't still have a DTL or SLB buf registered */ + err = H_RESOURCE; + if (vpa_is_registered(&tvcpu->arch.dtl) || + vpa_is_registered(&tvcpu->arch.slb_shadow)) + break; + + vpap = &tvcpu->arch.vpa; + err = 0; + break; + + case H_VPA_DEREG_DTL: /* deregister DTL */ + vpap = &tvcpu->arch.dtl; + err = 0; + break; + + case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ + vpap = &tvcpu->arch.slb_shadow; + err = 0; + break; + } + + if (vpap) { + vpap->next_gpa = vpa; + vpap->len = len; + vpap->update_pending = 1; + } + + spin_unlock(&tvcpu->arch.vpa_update_lock); + + return err; +} + +static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) +{ + struct kvm *kvm = vcpu->kvm; + void *va; + unsigned long nb; + unsigned long gpa; + + /* + * We need to pin the page pointed to by vpap->next_gpa, + * but we can't call kvmppc_pin_guest_page under the lock + * as it does get_user_pages() and down_read(). So we + * have to drop the lock, pin the page, then get the lock + * again and check that a new area didn't get registered + * in the meantime. + */ + for (;;) { + gpa = vpap->next_gpa; + spin_unlock(&vcpu->arch.vpa_update_lock); + va = NULL; + nb = 0; + if (gpa) + va = kvmppc_pin_guest_page(kvm, gpa, &nb); + spin_lock(&vcpu->arch.vpa_update_lock); + if (gpa == vpap->next_gpa) + break; + /* sigh... unpin that one and try again */ + if (va) + kvmppc_unpin_guest_page(kvm, va, gpa, false); + } + + vpap->update_pending = 0; + if (va && nb < vpap->len) { + /* + * If it's now too short, it must be that userspace + * has changed the mappings underlying guest memory, + * so unregister the region. + */ + kvmppc_unpin_guest_page(kvm, va, gpa, false); + va = NULL; + } + if (vpap->pinned_addr) + kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, + vpap->dirty); + vpap->gpa = gpa; + vpap->pinned_addr = va; + vpap->dirty = false; + if (va) + vpap->pinned_end = va + vpap->len; +} + +static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.vpa.update_pending || + vcpu->arch.slb_shadow.update_pending || + vcpu->arch.dtl.update_pending)) + return; + + spin_lock(&vcpu->arch.vpa_update_lock); + if (vcpu->arch.vpa.update_pending) { + kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); + if (vcpu->arch.vpa.pinned_addr) + init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); + } + if (vcpu->arch.dtl.update_pending) { + kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); + vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; + vcpu->arch.dtl_index = 0; + } + if (vcpu->arch.slb_shadow.update_pending) + kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); + spin_unlock(&vcpu->arch.vpa_update_lock); +} + +/* + * Return the accumulated stolen time for the vcore up until `now'. + * The caller should hold the vcore lock. + */ +static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) +{ + u64 p; + unsigned long flags; + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + spin_lock_irqsave(&vc->stoltb_lock, flags); + p = vc->stolen_tb; + if (vc->vcore_state != VCORE_INACTIVE && + vc->preempt_tb != TB_NIL) + p += now - vc->preempt_tb; + spin_unlock_irqrestore(&vc->stoltb_lock, flags); + return p; +} + +static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, + struct lppaca *vpa, + unsigned int pcpu, u64 now, + unsigned long stolen) +{ + struct dtl_entry *dt; + + dt = vcpu->arch.dtl_ptr; + + if (!dt) + return; + + dt->dispatch_reason = 7; + dt->preempt_reason = 0; + dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid); + dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); + dt->ready_to_enqueue_time = 0; + dt->waiting_to_ready_time = 0; + dt->timebase = cpu_to_be64(now); + dt->fault_addr = 0; + dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); + dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); + + ++dt; + if (dt == vcpu->arch.dtl.pinned_end) + dt = vcpu->arch.dtl.pinned_addr; + vcpu->arch.dtl_ptr = dt; + /* order writing *dt vs. writing vpa->dtl_idx */ + smp_wmb(); + vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); + + /* vcpu->arch.dtl.dirty is set by the caller */ +} + +static void kvmppc_update_vpa_dispatch(struct kvm_vcpu *vcpu, + struct kvmppc_vcore *vc) +{ + struct lppaca *vpa; + unsigned long stolen; + unsigned long core_stolen; + u64 now; + unsigned long flags; + + vpa = vcpu->arch.vpa.pinned_addr; + if (!vpa) + return; + + now = mftb(); + + core_stolen = vcore_stolen_time(vc, now); + stolen = core_stolen - vcpu->arch.stolen_logged; + vcpu->arch.stolen_logged = core_stolen; + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); + stolen += vcpu->arch.busy_stolen; + vcpu->arch.busy_stolen = 0; + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); + + vpa->enqueue_dispatch_tb = cpu_to_be64(be64_to_cpu(vpa->enqueue_dispatch_tb) + stolen); + + __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now + vc->tb_offset, stolen); + + vcpu->arch.vpa.dirty = true; +} + +static void kvmppc_update_vpa_dispatch_p9(struct kvm_vcpu *vcpu, + struct kvmppc_vcore *vc, + u64 now) +{ + struct lppaca *vpa; + unsigned long stolen; + unsigned long stolen_delta; + + vpa = vcpu->arch.vpa.pinned_addr; + if (!vpa) + return; + + stolen = vc->stolen_tb; + stolen_delta = stolen - vcpu->arch.stolen_logged; + vcpu->arch.stolen_logged = stolen; + + vpa->enqueue_dispatch_tb = cpu_to_be64(stolen); + + __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now, stolen_delta); + + vcpu->arch.vpa.dirty = true; +} + +/* See if there is a doorbell interrupt pending for a vcpu */ +static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) +{ + int thr; + struct kvmppc_vcore *vc; + + if (vcpu->arch.doorbell_request) + return true; + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return false; + /* + * Ensure that the read of vcore->dpdes comes after the read + * of vcpu->doorbell_request. This barrier matches the + * smp_wmb() in kvmppc_guest_entry_inject(). + */ + smp_rmb(); + vc = vcpu->arch.vcore; + thr = vcpu->vcpu_id - vc->first_vcpuid; + return !!(vc->dpdes & (1 << thr)); +} + +static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) +{ + if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) + return true; + if ((!vcpu->arch.vcore->arch_compat) && + cpu_has_feature(CPU_FTR_ARCH_207S)) + return true; + return false; +} + +static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, + unsigned long resource, unsigned long value1, + unsigned long value2) +{ + switch (resource) { + case H_SET_MODE_RESOURCE_SET_CIABR: + if (!kvmppc_power8_compatible(vcpu)) + return H_P2; + if (value2) + return H_P4; + if (mflags) + return H_UNSUPPORTED_FLAG_START; + /* Guests can't breakpoint the hypervisor */ + if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) + return H_P3; + vcpu->arch.ciabr = value1; + return H_SUCCESS; + case H_SET_MODE_RESOURCE_SET_DAWR0: + if (!kvmppc_power8_compatible(vcpu)) + return H_P2; + if (!ppc_breakpoint_available()) + return H_P2; + if (mflags) + return H_UNSUPPORTED_FLAG_START; + if (value2 & DABRX_HYP) + return H_P4; + vcpu->arch.dawr0 = value1; + vcpu->arch.dawrx0 = value2; + return H_SUCCESS; + case H_SET_MODE_RESOURCE_SET_DAWR1: + if (!kvmppc_power8_compatible(vcpu)) + return H_P2; + if (!ppc_breakpoint_available()) + return H_P2; + if (!cpu_has_feature(CPU_FTR_DAWR1)) + return H_P2; + if (!vcpu->kvm->arch.dawr1_enabled) + return H_FUNCTION; + if (mflags) + return H_UNSUPPORTED_FLAG_START; + if (value2 & DABRX_HYP) + return H_P4; + vcpu->arch.dawr1 = value1; + vcpu->arch.dawrx1 = value2; + return H_SUCCESS; + case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: + /* + * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved. + * Keep this in synch with kvmppc_filter_guest_lpcr_hv. + */ + if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && + kvmhv_vcpu_is_radix(vcpu) && mflags == 3) + return H_UNSUPPORTED_FLAG_START; + return H_TOO_HARD; + default: + return H_TOO_HARD; + } +} + +/* Copy guest memory in place - must reside within a single memslot */ +static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, + unsigned long len) +{ + struct kvm_memory_slot *to_memslot = NULL; + struct kvm_memory_slot *from_memslot = NULL; + unsigned long to_addr, from_addr; + int r; + + /* Get HPA for from address */ + from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); + if (!from_memslot) + return -EFAULT; + if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) + << PAGE_SHIFT)) + return -EINVAL; + from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); + if (kvm_is_error_hva(from_addr)) + return -EFAULT; + from_addr |= (from & (PAGE_SIZE - 1)); + + /* Get HPA for to address */ + to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); + if (!to_memslot) + return -EFAULT; + if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) + << PAGE_SHIFT)) + return -EINVAL; + to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); + if (kvm_is_error_hva(to_addr)) + return -EFAULT; + to_addr |= (to & (PAGE_SIZE - 1)); + + /* Perform copy */ + r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, + len); + if (r) + return -EFAULT; + mark_page_dirty(kvm, to >> PAGE_SHIFT); + return 0; +} + +static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, + unsigned long dest, unsigned long src) +{ + u64 pg_sz = SZ_4K; /* 4K page size */ + u64 pg_mask = SZ_4K - 1; + int ret; + + /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ + if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | + H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) + return H_PARAMETER; + + /* dest (and src if copy_page flag set) must be page aligned */ + if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) + return H_PARAMETER; + + /* zero and/or copy the page as determined by the flags */ + if (flags & H_COPY_PAGE) { + ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); + if (ret < 0) + return H_PARAMETER; + } else if (flags & H_ZERO_PAGE) { + ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); + if (ret < 0) + return H_PARAMETER; + } + + /* We can ignore the remaining flags */ + + return H_SUCCESS; +} + +static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) +{ + struct kvmppc_vcore *vcore = target->arch.vcore; + + /* + * We expect to have been called by the real mode handler + * (kvmppc_rm_h_confer()) which would have directly returned + * H_SUCCESS if the source vcore wasn't idle (e.g. if it may + * have useful work to do and should not confer) so we don't + * recheck that here. + * + * In the case of the P9 single vcpu per vcore case, the real + * mode handler is not called but no other threads are in the + * source vcore. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) { + spin_lock(&vcore->lock); + if (target->arch.state == KVMPPC_VCPU_RUNNABLE && + vcore->vcore_state != VCORE_INACTIVE && + vcore->runner) + target = vcore->runner; + spin_unlock(&vcore->lock); + } + + return kvm_vcpu_yield_to(target); +} + +static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) +{ + int yield_count = 0; + struct lppaca *lppaca; + + spin_lock(&vcpu->arch.vpa_update_lock); + lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; + if (lppaca) + yield_count = be32_to_cpu(lppaca->yield_count); + spin_unlock(&vcpu->arch.vpa_update_lock); + return yield_count; +} + +/* + * H_RPT_INVALIDATE hcall handler for nested guests. + * + * Handles only nested process-scoped invalidation requests in L0. + */ +static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu) +{ + unsigned long type = kvmppc_get_gpr(vcpu, 6); + unsigned long pid, pg_sizes, start, end; + + /* + * The partition-scoped invalidations aren't handled here in L0. + */ + if (type & H_RPTI_TYPE_NESTED) + return RESUME_HOST; + + pid = kvmppc_get_gpr(vcpu, 4); + pg_sizes = kvmppc_get_gpr(vcpu, 7); + start = kvmppc_get_gpr(vcpu, 8); + end = kvmppc_get_gpr(vcpu, 9); + + do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid, + type, pg_sizes, start, end); + + kvmppc_set_gpr(vcpu, 3, H_SUCCESS); + return RESUME_GUEST; +} + +static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, + unsigned long id, unsigned long target, + unsigned long type, unsigned long pg_sizes, + unsigned long start, unsigned long end) +{ + if (!kvm_is_radix(vcpu->kvm)) + return H_UNSUPPORTED; + + if (end < start) + return H_P5; + + /* + * Partition-scoped invalidation for nested guests. + */ + if (type & H_RPTI_TYPE_NESTED) { + if (!nesting_enabled(vcpu->kvm)) + return H_FUNCTION; + + /* Support only cores as target */ + if (target != H_RPTI_TARGET_CMMU) + return H_P2; + + return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes, + start, end); + } + + /* + * Process-scoped invalidation for L1 guests. + */ + do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid, + type, pg_sizes, start, end); + return H_SUCCESS; +} + +int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long req = kvmppc_get_gpr(vcpu, 3); + unsigned long target, ret = H_SUCCESS; + int yield_count; + struct kvm_vcpu *tvcpu; + int idx, rc; + + if (req <= MAX_HCALL_OPCODE && + !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) + return RESUME_HOST; + + switch (req) { + case H_REMOVE: + ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_ENTER: + ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_READ: + ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_CLEAR_MOD: + ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_CLEAR_REF: + ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_PROTECT: + ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_BULK_REMOVE: + ret = kvmppc_h_bulk_remove(vcpu); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + + case H_CEDE: + break; + case H_PROD: + target = kvmppc_get_gpr(vcpu, 4); + tvcpu = kvmppc_find_vcpu(kvm, target); + if (!tvcpu) { + ret = H_PARAMETER; + break; + } + tvcpu->arch.prodded = 1; + smp_mb(); /* This orders prodded store vs ceded load */ + if (tvcpu->arch.ceded) + kvmppc_fast_vcpu_kick_hv(tvcpu); + break; + case H_CONFER: + target = kvmppc_get_gpr(vcpu, 4); + if (target == -1) + break; + tvcpu = kvmppc_find_vcpu(kvm, target); + if (!tvcpu) { + ret = H_PARAMETER; + break; + } + yield_count = kvmppc_get_gpr(vcpu, 5); + if (kvmppc_get_yield_count(tvcpu) != yield_count) + break; + kvm_arch_vcpu_yield_to(tvcpu); + break; + case H_REGISTER_VPA: + ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + break; + case H_RTAS: + if (list_empty(&kvm->arch.rtas_tokens)) + return RESUME_HOST; + + idx = srcu_read_lock(&kvm->srcu); + rc = kvmppc_rtas_hcall(vcpu); + srcu_read_unlock(&kvm->srcu, idx); + + if (rc == -ENOENT) + return RESUME_HOST; + else if (rc == 0) + break; + + /* Send the error out to userspace via KVM_RUN */ + return rc; + case H_LOGICAL_CI_LOAD: + ret = kvmppc_h_logical_ci_load(vcpu); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_LOGICAL_CI_STORE: + ret = kvmppc_h_logical_ci_store(vcpu); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_SET_MODE: + ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: + if (kvmppc_xics_enabled(vcpu)) { + if (xics_on_xive()) { + ret = H_NOT_AVAILABLE; + return RESUME_GUEST; + } + ret = kvmppc_xics_hcall(vcpu, req); + break; + } + return RESUME_HOST; + case H_SET_DABR: + ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); + break; + case H_SET_XDABR: + ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + break; +#ifdef CONFIG_SPAPR_TCE_IOMMU + case H_GET_TCE: + ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_PUT_TCE: + ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_PUT_TCE_INDIRECT: + ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; + case H_STUFF_TCE: + ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7)); + if (ret == H_TOO_HARD) + return RESUME_HOST; + break; +#endif + case H_RANDOM: + if (!arch_get_random_seed_longs(&vcpu->arch.regs.gpr[4], 1)) + ret = H_HARDWARE; + break; + case H_RPT_INVALIDATE: + ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6), + kvmppc_get_gpr(vcpu, 7), + kvmppc_get_gpr(vcpu, 8), + kvmppc_get_gpr(vcpu, 9)); + break; + + case H_SET_PARTITION_TABLE: + ret = H_FUNCTION; + if (nesting_enabled(kvm)) + ret = kvmhv_set_partition_table(vcpu); + break; + case H_ENTER_NESTED: + ret = H_FUNCTION; + if (!nesting_enabled(kvm)) + break; + ret = kvmhv_enter_nested_guest(vcpu); + if (ret == H_INTERRUPT) { + kvmppc_set_gpr(vcpu, 3, 0); + vcpu->arch.hcall_needed = 0; + return -EINTR; + } else if (ret == H_TOO_HARD) { + kvmppc_set_gpr(vcpu, 3, 0); + vcpu->arch.hcall_needed = 0; + return RESUME_HOST; + } + break; + case H_TLB_INVALIDATE: + ret = H_FUNCTION; + if (nesting_enabled(kvm)) + ret = kvmhv_do_nested_tlbie(vcpu); + break; + case H_COPY_TOFROM_GUEST: + ret = H_FUNCTION; + if (nesting_enabled(kvm)) + ret = kvmhv_copy_tofrom_guest_nested(vcpu); + break; + case H_PAGE_INIT: + ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + break; + case H_SVM_PAGE_IN: + ret = H_UNSUPPORTED; + if (kvmppc_get_srr1(vcpu) & MSR_S) + ret = kvmppc_h_svm_page_in(kvm, + kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + break; + case H_SVM_PAGE_OUT: + ret = H_UNSUPPORTED; + if (kvmppc_get_srr1(vcpu) & MSR_S) + ret = kvmppc_h_svm_page_out(kvm, + kvmppc_get_gpr(vcpu, 4), + kvmppc_get_gpr(vcpu, 5), + kvmppc_get_gpr(vcpu, 6)); + break; + case H_SVM_INIT_START: + ret = H_UNSUPPORTED; + if (kvmppc_get_srr1(vcpu) & MSR_S) + ret = kvmppc_h_svm_init_start(kvm); + break; + case H_SVM_INIT_DONE: + ret = H_UNSUPPORTED; + if (kvmppc_get_srr1(vcpu) & MSR_S) + ret = kvmppc_h_svm_init_done(kvm); + break; + case H_SVM_INIT_ABORT: + /* + * Even if that call is made by the Ultravisor, the SSR1 value + * is the guest context one, with the secure bit clear as it has + * not yet been secured. So we can't check it here. + * Instead the kvm->arch.secure_guest flag is checked inside + * kvmppc_h_svm_init_abort(). + */ + ret = kvmppc_h_svm_init_abort(kvm); + break; + + default: + return RESUME_HOST; + } + WARN_ON_ONCE(ret == H_TOO_HARD); + kvmppc_set_gpr(vcpu, 3, ret); + vcpu->arch.hcall_needed = 0; + return RESUME_GUEST; +} + +/* + * Handle H_CEDE in the P9 path where we don't call the real-mode hcall + * handlers in book3s_hv_rmhandlers.S. + * + * This has to be done early, not in kvmppc_pseries_do_hcall(), so + * that the cede logic in kvmppc_run_single_vcpu() works properly. + */ +static void kvmppc_cede(struct kvm_vcpu *vcpu) +{ + vcpu->arch.shregs.msr |= MSR_EE; + vcpu->arch.ceded = 1; + smp_mb(); + if (vcpu->arch.prodded) { + vcpu->arch.prodded = 0; + smp_mb(); + vcpu->arch.ceded = 0; + } +} + +static int kvmppc_hcall_impl_hv(unsigned long cmd) +{ + switch (cmd) { + case H_CEDE: + case H_PROD: + case H_CONFER: + case H_REGISTER_VPA: + case H_SET_MODE: +#ifdef CONFIG_SPAPR_TCE_IOMMU + case H_GET_TCE: + case H_PUT_TCE: + case H_PUT_TCE_INDIRECT: + case H_STUFF_TCE: +#endif + case H_LOGICAL_CI_LOAD: + case H_LOGICAL_CI_STORE: +#ifdef CONFIG_KVM_XICS + case H_XIRR: + case H_CPPR: + case H_EOI: + case H_IPI: + case H_IPOLL: + case H_XIRR_X: +#endif + case H_PAGE_INIT: + case H_RPT_INVALIDATE: + return 1; + } + + /* See if it's in the real-mode table */ + return kvmppc_hcall_impl_hv_realmode(cmd); +} + +static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) +{ + u32 last_inst; + + if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != + EMULATE_DONE) { + /* + * Fetch failed, so return to guest and + * try executing it again. + */ + return RESUME_GUEST; + } + + if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { + vcpu->run->exit_reason = KVM_EXIT_DEBUG; + vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); + return RESUME_HOST; + } else { + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + return RESUME_GUEST; + } +} + +static void do_nothing(void *x) +{ +} + +static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) +{ + int thr, cpu, pcpu, nthreads; + struct kvm_vcpu *v; + unsigned long dpdes; + + nthreads = vcpu->kvm->arch.emul_smt_mode; + dpdes = 0; + cpu = vcpu->vcpu_id & ~(nthreads - 1); + for (thr = 0; thr < nthreads; ++thr, ++cpu) { + v = kvmppc_find_vcpu(vcpu->kvm, cpu); + if (!v) + continue; + /* + * If the vcpu is currently running on a physical cpu thread, + * interrupt it in order to pull it out of the guest briefly, + * which will update its vcore->dpdes value. + */ + pcpu = READ_ONCE(v->cpu); + if (pcpu >= 0) + smp_call_function_single(pcpu, do_nothing, NULL, 1); + if (kvmppc_doorbell_pending(v)) + dpdes |= 1 << thr; + } + return dpdes; +} + +/* + * On POWER9, emulate doorbell-related instructions in order to + * give the guest the illusion of running on a multi-threaded core. + * The instructions emulated are msgsndp, msgclrp, mfspr TIR, + * and mfspr DPDES. + */ +static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) +{ + u32 inst, rb, thr; + unsigned long arg; + struct kvm *kvm = vcpu->kvm; + struct kvm_vcpu *tvcpu; + + if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE) + return RESUME_GUEST; + if (get_op(inst) != 31) + return EMULATE_FAIL; + rb = get_rb(inst); + thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); + switch (get_xop(inst)) { + case OP_31_XOP_MSGSNDP: + arg = kvmppc_get_gpr(vcpu, rb); + if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) + break; + arg &= 0x7f; + if (arg >= kvm->arch.emul_smt_mode) + break; + tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); + if (!tvcpu) + break; + if (!tvcpu->arch.doorbell_request) { + tvcpu->arch.doorbell_request = 1; + kvmppc_fast_vcpu_kick_hv(tvcpu); + } + break; + case OP_31_XOP_MSGCLRP: + arg = kvmppc_get_gpr(vcpu, rb); + if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) + break; + vcpu->arch.vcore->dpdes = 0; + vcpu->arch.doorbell_request = 0; + break; + case OP_31_XOP_MFSPR: + switch (get_sprn(inst)) { + case SPRN_TIR: + arg = thr; + break; + case SPRN_DPDES: + arg = kvmppc_read_dpdes(vcpu); + break; + default: + return EMULATE_FAIL; + } + kvmppc_set_gpr(vcpu, get_rt(inst), arg); + break; + default: + return EMULATE_FAIL; + } + kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); + return RESUME_GUEST; +} + +/* + * If the lppaca had pmcregs_in_use clear when we exited the guest, then + * HFSCR_PM is cleared for next entry. If the guest then tries to access + * the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM + * back in the guest HFSCR will cause the next entry to load the PMU SPRs and + * allow the guest access to continue. + */ +static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.hfscr_permitted & HFSCR_PM)) + return EMULATE_FAIL; + + vcpu->arch.hfscr |= HFSCR_PM; + + return RESUME_GUEST; +} + +static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB)) + return EMULATE_FAIL; + + vcpu->arch.hfscr |= HFSCR_EBB; + + return RESUME_GUEST; +} + +static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.hfscr_permitted & HFSCR_TM)) + return EMULATE_FAIL; + + vcpu->arch.hfscr |= HFSCR_TM; + + return RESUME_GUEST; +} + +static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, + struct task_struct *tsk) +{ + struct kvm_run *run = vcpu->run; + int r = RESUME_HOST; + + vcpu->stat.sum_exits++; + + /* + * This can happen if an interrupt occurs in the last stages + * of guest entry or the first stages of guest exit (i.e. after + * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV + * and before setting it to KVM_GUEST_MODE_HOST_HV). + * That can happen due to a bug, or due to a machine check + * occurring at just the wrong time. + */ + if (vcpu->arch.shregs.msr & MSR_HV) { + printk(KERN_EMERG "KVM trap in HV mode!\n"); + printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", + vcpu->arch.trap, kvmppc_get_pc(vcpu), + vcpu->arch.shregs.msr); + kvmppc_dump_regs(vcpu); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + run->hw.hardware_exit_reason = vcpu->arch.trap; + return RESUME_HOST; + } + run->exit_reason = KVM_EXIT_UNKNOWN; + run->ready_for_interrupt_injection = 1; + switch (vcpu->arch.trap) { + /* We're good on these - the host merely wanted to get our attention */ + case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: + WARN_ON_ONCE(1); /* Should never happen */ + vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; + fallthrough; + case BOOK3S_INTERRUPT_HV_DECREMENTER: + vcpu->stat.dec_exits++; + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_EXTERNAL: + case BOOK3S_INTERRUPT_H_DOORBELL: + case BOOK3S_INTERRUPT_H_VIRT: + vcpu->stat.ext_intr_exits++; + r = RESUME_GUEST; + break; + /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ + case BOOK3S_INTERRUPT_HMI: + case BOOK3S_INTERRUPT_PERFMON: + case BOOK3S_INTERRUPT_SYSTEM_RESET: + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_MACHINE_CHECK: { + static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); + /* + * Print the MCE event to host console. Ratelimit so the guest + * can't flood the host log. + */ + if (__ratelimit(&rs)) + machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); + + /* + * If the guest can do FWNMI, exit to userspace so it can + * deliver a FWNMI to the guest. + * Otherwise we synthesize a machine check for the guest + * so that it knows that the machine check occurred. + */ + if (!vcpu->kvm->arch.fwnmi_enabled) { + ulong flags = vcpu->arch.shregs.msr & 0x083c0000; + kvmppc_core_queue_machine_check(vcpu, flags); + r = RESUME_GUEST; + break; + } + + /* Exit to guest with KVM_EXIT_NMI as exit reason */ + run->exit_reason = KVM_EXIT_NMI; + run->hw.hardware_exit_reason = vcpu->arch.trap; + /* Clear out the old NMI status from run->flags */ + run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; + /* Now set the NMI status */ + if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) + run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; + else + run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; + + r = RESUME_HOST; + break; + } + case BOOK3S_INTERRUPT_PROGRAM: + { + ulong flags; + /* + * Normally program interrupts are delivered directly + * to the guest by the hardware, but we can get here + * as a result of a hypervisor emulation interrupt + * (e40) getting turned into a 700 by BML RTAS. + */ + flags = vcpu->arch.shregs.msr & 0x1f0000ull; + kvmppc_core_queue_program(vcpu, flags); + r = RESUME_GUEST; + break; + } + case BOOK3S_INTERRUPT_SYSCALL: + { + int i; + + if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) { + /* + * Guest userspace executed sc 1. This can only be + * reached by the P9 path because the old path + * handles this case in realmode hcall handlers. + */ + if (!kvmhv_vcpu_is_radix(vcpu)) { + /* + * A guest could be running PR KVM, so this + * may be a PR KVM hcall. It must be reflected + * to the guest kernel as a sc interrupt. + */ + kvmppc_core_queue_syscall(vcpu); + } else { + /* + * Radix guests can not run PR KVM or nested HV + * hash guests which might run PR KVM, so this + * is always a privilege fault. Send a program + * check to guest kernel. + */ + kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV); + } + r = RESUME_GUEST; + break; + } + + /* + * hcall - gather args and set exit_reason. This will next be + * handled by kvmppc_pseries_do_hcall which may be able to deal + * with it and resume guest, or may punt to userspace. + */ + run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); + for (i = 0; i < 9; ++i) + run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); + run->exit_reason = KVM_EXIT_PAPR_HCALL; + vcpu->arch.hcall_needed = 1; + r = RESUME_HOST; + break; + } + /* + * We get these next two if the guest accesses a page which it thinks + * it has mapped but which is not actually present, either because + * it is for an emulated I/O device or because the corresonding + * host page has been paged out. + * + * Any other HDSI/HISI interrupts have been handled already for P7/8 + * guests. For POWER9 hash guests not using rmhandlers, basic hash + * fault handling is done here. + */ + case BOOK3S_INTERRUPT_H_DATA_STORAGE: { + unsigned long vsid; + long err; + + if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && + unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) { + r = RESUME_GUEST; /* Just retry if it's the canary */ + break; + } + + if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { + /* + * Radix doesn't require anything, and pre-ISAv3.0 hash + * already attempted to handle this in rmhandlers. The + * hash fault handling below is v3 only (it uses ASDR + * via fault_gpa). + */ + r = RESUME_PAGE_FAULT; + break; + } + + if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) { + kvmppc_core_queue_data_storage(vcpu, + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); + r = RESUME_GUEST; + break; + } + + if (!(vcpu->arch.shregs.msr & MSR_DR)) + vsid = vcpu->kvm->arch.vrma_slb_v; + else + vsid = vcpu->arch.fault_gpa; + + err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, + vsid, vcpu->arch.fault_dsisr, true); + if (err == 0) { + r = RESUME_GUEST; + } else if (err == -1 || err == -2) { + r = RESUME_PAGE_FAULT; + } else { + kvmppc_core_queue_data_storage(vcpu, + vcpu->arch.fault_dar, err); + r = RESUME_GUEST; + } + break; + } + case BOOK3S_INTERRUPT_H_INST_STORAGE: { + unsigned long vsid; + long err; + + vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); + vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr & + DSISR_SRR1_MATCH_64S; + if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { + /* + * Radix doesn't require anything, and pre-ISAv3.0 hash + * already attempted to handle this in rmhandlers. The + * hash fault handling below is v3 only (it uses ASDR + * via fault_gpa). + */ + if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) + vcpu->arch.fault_dsisr |= DSISR_ISSTORE; + r = RESUME_PAGE_FAULT; + break; + } + + if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) { + kvmppc_core_queue_inst_storage(vcpu, + vcpu->arch.fault_dsisr); + r = RESUME_GUEST; + break; + } + + if (!(vcpu->arch.shregs.msr & MSR_IR)) + vsid = vcpu->kvm->arch.vrma_slb_v; + else + vsid = vcpu->arch.fault_gpa; + + err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, + vsid, vcpu->arch.fault_dsisr, false); + if (err == 0) { + r = RESUME_GUEST; + } else if (err == -1) { + r = RESUME_PAGE_FAULT; + } else { + kvmppc_core_queue_inst_storage(vcpu, err); + r = RESUME_GUEST; + } + break; + } + + /* + * This occurs if the guest executes an illegal instruction. + * If the guest debug is disabled, generate a program interrupt + * to the guest. If guest debug is enabled, we need to check + * whether the instruction is a software breakpoint instruction. + * Accordingly return to Guest or Host. + */ + case BOOK3S_INTERRUPT_H_EMUL_ASSIST: + if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) + vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? + swab32(vcpu->arch.emul_inst) : + vcpu->arch.emul_inst; + if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { + r = kvmppc_emulate_debug_inst(vcpu); + } else { + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + r = RESUME_GUEST; + } + break; + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case BOOK3S_INTERRUPT_HV_SOFTPATCH: + /* + * This occurs for various TM-related instructions that + * we need to emulate on POWER9 DD2.2. We have already + * handled the cases where the guest was in real-suspend + * mode and was transitioning to transactional state. + */ + r = kvmhv_p9_tm_emulation(vcpu); + if (r != -1) + break; + fallthrough; /* go to facility unavailable handler */ +#endif + + /* + * This occurs if the guest (kernel or userspace), does something that + * is prohibited by HFSCR. + * On POWER9, this could be a doorbell instruction that we need + * to emulate. + * Otherwise, we just generate a program interrupt to the guest. + */ + case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { + u64 cause = vcpu->arch.hfscr >> 56; + + r = EMULATE_FAIL; + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (cause == FSCR_MSGP_LG) + r = kvmppc_emulate_doorbell_instr(vcpu); + if (cause == FSCR_PM_LG) + r = kvmppc_pmu_unavailable(vcpu); + if (cause == FSCR_EBB_LG) + r = kvmppc_ebb_unavailable(vcpu); + if (cause == FSCR_TM_LG) + r = kvmppc_tm_unavailable(vcpu); + } + if (r == EMULATE_FAIL) { + kvmppc_core_queue_program(vcpu, SRR1_PROGILL); + r = RESUME_GUEST; + } + break; + } + + case BOOK3S_INTERRUPT_HV_RM_HARD: + r = RESUME_PASSTHROUGH; + break; + default: + kvmppc_dump_regs(vcpu); + printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", + vcpu->arch.trap, kvmppc_get_pc(vcpu), + vcpu->arch.shregs.msr); + run->hw.hardware_exit_reason = vcpu->arch.trap; + r = RESUME_HOST; + break; + } + + return r; +} + +static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) +{ + int r; + int srcu_idx; + + vcpu->stat.sum_exits++; + + /* + * This can happen if an interrupt occurs in the last stages + * of guest entry or the first stages of guest exit (i.e. after + * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV + * and before setting it to KVM_GUEST_MODE_HOST_HV). + * That can happen due to a bug, or due to a machine check + * occurring at just the wrong time. + */ + if (vcpu->arch.shregs.msr & MSR_HV) { + pr_emerg("KVM trap in HV mode while nested!\n"); + pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", + vcpu->arch.trap, kvmppc_get_pc(vcpu), + vcpu->arch.shregs.msr); + kvmppc_dump_regs(vcpu); + return RESUME_HOST; + } + switch (vcpu->arch.trap) { + /* We're good on these - the host merely wanted to get our attention */ + case BOOK3S_INTERRUPT_HV_DECREMENTER: + vcpu->stat.dec_exits++; + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_EXTERNAL: + vcpu->stat.ext_intr_exits++; + r = RESUME_HOST; + break; + case BOOK3S_INTERRUPT_H_DOORBELL: + case BOOK3S_INTERRUPT_H_VIRT: + vcpu->stat.ext_intr_exits++; + r = RESUME_GUEST; + break; + /* These need to go to the nested HV */ + case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: + vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; + vcpu->stat.dec_exits++; + r = RESUME_HOST; + break; + /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ + case BOOK3S_INTERRUPT_HMI: + case BOOK3S_INTERRUPT_PERFMON: + case BOOK3S_INTERRUPT_SYSTEM_RESET: + r = RESUME_GUEST; + break; + case BOOK3S_INTERRUPT_MACHINE_CHECK: + { + static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); + /* Pass the machine check to the L1 guest */ + r = RESUME_HOST; + /* Print the MCE event to host console. */ + if (__ratelimit(&rs)) + machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); + break; + } + /* + * We get these next two if the guest accesses a page which it thinks + * it has mapped but which is not actually present, either because + * it is for an emulated I/O device or because the corresonding + * host page has been paged out. + */ + case BOOK3S_INTERRUPT_H_DATA_STORAGE: + srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + r = kvmhv_nested_page_fault(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); + break; + case BOOK3S_INTERRUPT_H_INST_STORAGE: + vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); + vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & + DSISR_SRR1_MATCH_64S; + if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) + vcpu->arch.fault_dsisr |= DSISR_ISSTORE; + srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + r = kvmhv_nested_page_fault(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); + break; + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case BOOK3S_INTERRUPT_HV_SOFTPATCH: + /* + * This occurs for various TM-related instructions that + * we need to emulate on POWER9 DD2.2. We have already + * handled the cases where the guest was in real-suspend + * mode and was transitioning to transactional state. + */ + r = kvmhv_p9_tm_emulation(vcpu); + if (r != -1) + break; + fallthrough; /* go to facility unavailable handler */ +#endif + + case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { + u64 cause = vcpu->arch.hfscr >> 56; + + /* + * Only pass HFU interrupts to the L1 if the facility is + * permitted but disabled by the L1's HFSCR, otherwise + * the interrupt does not make sense to the L1 so turn + * it into a HEAI. + */ + if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) || + (vcpu->arch.nested_hfscr & (1UL << cause))) { + vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST; + + /* + * If the fetch failed, return to guest and + * try executing it again. + */ + r = kvmppc_get_last_inst(vcpu, INST_GENERIC, + &vcpu->arch.emul_inst); + if (r != EMULATE_DONE) + r = RESUME_GUEST; + else + r = RESUME_HOST; + } else { + r = RESUME_HOST; + } + + break; + } + + case BOOK3S_INTERRUPT_HV_RM_HARD: + vcpu->arch.trap = 0; + r = RESUME_GUEST; + if (!xics_on_xive()) + kvmppc_xics_rm_complete(vcpu, 0); + break; + case BOOK3S_INTERRUPT_SYSCALL: + { + unsigned long req = kvmppc_get_gpr(vcpu, 3); + + /* + * The H_RPT_INVALIDATE hcalls issued by nested + * guests for process-scoped invalidations when + * GTSE=0, are handled here in L0. + */ + if (req == H_RPT_INVALIDATE) { + r = kvmppc_nested_h_rpt_invalidate(vcpu); + break; + } + + r = RESUME_HOST; + break; + } + default: + r = RESUME_HOST; + break; + } + + return r; +} + +static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + int i; + + memset(sregs, 0, sizeof(struct kvm_sregs)); + sregs->pvr = vcpu->arch.pvr; + for (i = 0; i < vcpu->arch.slb_max; i++) { + sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; + sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; + } + + return 0; +} + +static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + int i, j; + + /* Only accept the same PVR as the host's, since we can't spoof it */ + if (sregs->pvr != vcpu->arch.pvr) + return -EINVAL; + + j = 0; + for (i = 0; i < vcpu->arch.slb_nr; i++) { + if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { + vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; + vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; + ++j; + } + } + vcpu->arch.slb_max = j; + + return 0; +} + +/* + * Enforce limits on guest LPCR values based on hardware availability, + * guest configuration, and possibly hypervisor support and security + * concerns. + */ +unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr) +{ + /* LPCR_TC only applies to HPT guests */ + if (kvm_is_radix(kvm)) + lpcr &= ~LPCR_TC; + + /* On POWER8 and above, userspace can modify AIL */ + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + lpcr &= ~LPCR_AIL; + if ((lpcr & LPCR_AIL) != LPCR_AIL_3) + lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */ + /* + * On some POWER9s we force AIL off for radix guests to prevent + * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to + * guest, which can result in Q0 translations with LPID=0 PID=PIDR to + * be cached, which the host TLB management does not expect. + */ + if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) + lpcr &= ~LPCR_AIL; + + /* + * On POWER9, allow userspace to enable large decrementer for the + * guest, whether or not the host has it enabled. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + lpcr &= ~LPCR_LD; + + return lpcr; +} + +static void verify_lpcr(struct kvm *kvm, unsigned long lpcr) +{ + if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) { + WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n", + lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr)); + } +} + +static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, + bool preserve_top32) +{ + struct kvm *kvm = vcpu->kvm; + struct kvmppc_vcore *vc = vcpu->arch.vcore; + u64 mask; + + spin_lock(&vc->lock); + + /* + * Userspace can only modify + * DPFD (default prefetch depth), ILE (interrupt little-endian), + * TC (translation control), AIL (alternate interrupt location), + * LD (large decrementer). + * These are subject to restrictions from kvmppc_filter_lcpr_hv(). + */ + mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD; + + /* Broken 32-bit version of LPCR must not clear top bits */ + if (preserve_top32) + mask &= 0xFFFFFFFF; + + new_lpcr = kvmppc_filter_lpcr_hv(kvm, + (vc->lpcr & ~mask) | (new_lpcr & mask)); + + /* + * If ILE (interrupt little-endian) has changed, update the + * MSR_LE bit in the intr_msr for each vcpu in this vcore. + */ + if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { + struct kvm_vcpu *vcpu; + unsigned long i; + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (vcpu->arch.vcore != vc) + continue; + if (new_lpcr & LPCR_ILE) + vcpu->arch.intr_msr |= MSR_LE; + else + vcpu->arch.intr_msr &= ~MSR_LE; + } + } + + vc->lpcr = new_lpcr; + + spin_unlock(&vc->lock); +} + +static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, + union kvmppc_one_reg *val) +{ + int r = 0; + long int i; + + switch (id) { + case KVM_REG_PPC_DEBUG_INST: + *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); + break; + case KVM_REG_PPC_HIOR: + *val = get_reg_val(id, 0); + break; + case KVM_REG_PPC_DABR: + *val = get_reg_val(id, vcpu->arch.dabr); + break; + case KVM_REG_PPC_DABRX: + *val = get_reg_val(id, vcpu->arch.dabrx); + break; + case KVM_REG_PPC_DSCR: + *val = get_reg_val(id, vcpu->arch.dscr); + break; + case KVM_REG_PPC_PURR: + *val = get_reg_val(id, vcpu->arch.purr); + break; + case KVM_REG_PPC_SPURR: + *val = get_reg_val(id, vcpu->arch.spurr); + break; + case KVM_REG_PPC_AMR: + *val = get_reg_val(id, vcpu->arch.amr); + break; + case KVM_REG_PPC_UAMOR: + *val = get_reg_val(id, vcpu->arch.uamor); + break; + case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: + i = id - KVM_REG_PPC_MMCR0; + *val = get_reg_val(id, vcpu->arch.mmcr[i]); + break; + case KVM_REG_PPC_MMCR2: + *val = get_reg_val(id, vcpu->arch.mmcr[2]); + break; + case KVM_REG_PPC_MMCRA: + *val = get_reg_val(id, vcpu->arch.mmcra); + break; + case KVM_REG_PPC_MMCRS: + *val = get_reg_val(id, vcpu->arch.mmcrs); + break; + case KVM_REG_PPC_MMCR3: + *val = get_reg_val(id, vcpu->arch.mmcr[3]); + break; + case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: + i = id - KVM_REG_PPC_PMC1; + *val = get_reg_val(id, vcpu->arch.pmc[i]); + break; + case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: + i = id - KVM_REG_PPC_SPMC1; + *val = get_reg_val(id, vcpu->arch.spmc[i]); + break; + case KVM_REG_PPC_SIAR: + *val = get_reg_val(id, vcpu->arch.siar); + break; + case KVM_REG_PPC_SDAR: + *val = get_reg_val(id, vcpu->arch.sdar); + break; + case KVM_REG_PPC_SIER: + *val = get_reg_val(id, vcpu->arch.sier[0]); + break; + case KVM_REG_PPC_SIER2: + *val = get_reg_val(id, vcpu->arch.sier[1]); + break; + case KVM_REG_PPC_SIER3: + *val = get_reg_val(id, vcpu->arch.sier[2]); + break; + case KVM_REG_PPC_IAMR: + *val = get_reg_val(id, vcpu->arch.iamr); + break; + case KVM_REG_PPC_PSPB: + *val = get_reg_val(id, vcpu->arch.pspb); + break; + case KVM_REG_PPC_DPDES: + /* + * On POWER9, where we are emulating msgsndp etc., + * we return 1 bit for each vcpu, which can come from + * either vcore->dpdes or doorbell_request. + * On POWER8, doorbell_request is 0. + */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + *val = get_reg_val(id, vcpu->arch.doorbell_request); + else + *val = get_reg_val(id, vcpu->arch.vcore->dpdes); + break; + case KVM_REG_PPC_VTB: + *val = get_reg_val(id, vcpu->arch.vcore->vtb); + break; + case KVM_REG_PPC_DAWR: + *val = get_reg_val(id, vcpu->arch.dawr0); + break; + case KVM_REG_PPC_DAWRX: + *val = get_reg_val(id, vcpu->arch.dawrx0); + break; + case KVM_REG_PPC_DAWR1: + *val = get_reg_val(id, vcpu->arch.dawr1); + break; + case KVM_REG_PPC_DAWRX1: + *val = get_reg_val(id, vcpu->arch.dawrx1); + break; + case KVM_REG_PPC_CIABR: + *val = get_reg_val(id, vcpu->arch.ciabr); + break; + case KVM_REG_PPC_CSIGR: + *val = get_reg_val(id, vcpu->arch.csigr); + break; + case KVM_REG_PPC_TACR: + *val = get_reg_val(id, vcpu->arch.tacr); + break; + case KVM_REG_PPC_TCSCR: + *val = get_reg_val(id, vcpu->arch.tcscr); + break; + case KVM_REG_PPC_PID: + *val = get_reg_val(id, vcpu->arch.pid); + break; + case KVM_REG_PPC_ACOP: + *val = get_reg_val(id, vcpu->arch.acop); + break; + case KVM_REG_PPC_WORT: + *val = get_reg_val(id, vcpu->arch.wort); + break; + case KVM_REG_PPC_TIDR: + *val = get_reg_val(id, vcpu->arch.tid); + break; + case KVM_REG_PPC_PSSCR: + *val = get_reg_val(id, vcpu->arch.psscr); + break; + case KVM_REG_PPC_VPA_ADDR: + spin_lock(&vcpu->arch.vpa_update_lock); + *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_VPA_SLB: + spin_lock(&vcpu->arch.vpa_update_lock); + val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; + val->vpaval.length = vcpu->arch.slb_shadow.len; + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_VPA_DTL: + spin_lock(&vcpu->arch.vpa_update_lock); + val->vpaval.addr = vcpu->arch.dtl.next_gpa; + val->vpaval.length = vcpu->arch.dtl.len; + spin_unlock(&vcpu->arch.vpa_update_lock); + break; + case KVM_REG_PPC_TB_OFFSET: + *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); + break; + case KVM_REG_PPC_LPCR: + case KVM_REG_PPC_LPCR_64: + *val = get_reg_val(id, vcpu->arch.vcore->lpcr); + break; + case KVM_REG_PPC_PPR: + *val = get_reg_val(id, vcpu->arch.ppr); + break; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case KVM_REG_PPC_TFHAR: + *val = get_reg_val(id, vcpu->arch.tfhar); + break; + case KVM_REG_PPC_TFIAR: + *val = get_reg_val(id, vcpu->arch.tfiar); + break; + case KVM_REG_PPC_TEXASR: + *val = get_reg_val(id, vcpu->arch.texasr); + break; + case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: + i = id - KVM_REG_PPC_TM_GPR0; + *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); + break; + case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: + { + int j; + i = id - KVM_REG_PPC_TM_VSR0; + if (i < 32) + for (j = 0; j < TS_FPRWIDTH; j++) + val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; + else { + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + val->vval = vcpu->arch.vr_tm.vr[i-32]; + else + r = -ENXIO; + } + break; + } + case KVM_REG_PPC_TM_CR: + *val = get_reg_val(id, vcpu->arch.cr_tm); + break; + case KVM_REG_PPC_TM_XER: + *val = get_reg_val(id, vcpu->arch.xer_tm); + break; + case KVM_REG_PPC_TM_LR: + *val = get_reg_val(id, vcpu->arch.lr_tm); + break; + case KVM_REG_PPC_TM_CTR: + *val = get_reg_val(id, vcpu->arch.ctr_tm); + break; + case KVM_REG_PPC_TM_FPSCR: + *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); + break; + case KVM_REG_PPC_TM_AMR: + *val = get_reg_val(id, vcpu->arch.amr_tm); + break; + case KVM_REG_PPC_TM_PPR: + *val = get_reg_val(id, vcpu->arch.ppr_tm); + break; + case KVM_REG_PPC_TM_VRSAVE: + *val = get_reg_val(id, vcpu->arch.vrsave_tm); + break; + case KVM_REG_PPC_TM_VSCR: + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); + else + r = -ENXIO; + break; + case KVM_REG_PPC_TM_DSCR: + *val = get_reg_val(id, vcpu->arch.dscr_tm); + break; + case KVM_REG_PPC_TM_TAR: + *val = get_reg_val(id, vcpu->arch.tar_tm); + break; +#endif + case KVM_REG_PPC_ARCH_COMPAT: + *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); + break; + case KVM_REG_PPC_DEC_EXPIRY: + *val = get_reg_val(id, vcpu->arch.dec_expires); + break; + case KVM_REG_PPC_ONLINE: + *val = get_reg_val(id, vcpu->arch.online); + break; + case KVM_REG_PPC_PTCR: + *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); + break; + default: + r = -EINVAL; + break; + } + + return r; +} + +static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, + union kvmppc_one_reg *val) +{ + int r = 0; + long int i; + unsigned long addr, len; + + switch (id) { + case KVM_REG_PPC_HIOR: + /* Only allow this to be set to zero */ + if (set_reg_val(id, *val)) + r = -EINVAL; + break; + case KVM_REG_PPC_DABR: + vcpu->arch.dabr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DABRX: + vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; + break; + case KVM_REG_PPC_DSCR: + vcpu->arch.dscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PURR: + vcpu->arch.purr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SPURR: + vcpu->arch.spurr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_AMR: + vcpu->arch.amr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_UAMOR: + vcpu->arch.uamor = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: + i = id - KVM_REG_PPC_MMCR0; + vcpu->arch.mmcr[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCR2: + vcpu->arch.mmcr[2] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCRA: + vcpu->arch.mmcra = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCRS: + vcpu->arch.mmcrs = set_reg_val(id, *val); + break; + case KVM_REG_PPC_MMCR3: + *val = get_reg_val(id, vcpu->arch.mmcr[3]); + break; + case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: + i = id - KVM_REG_PPC_PMC1; + vcpu->arch.pmc[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: + i = id - KVM_REG_PPC_SPMC1; + vcpu->arch.spmc[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIAR: + vcpu->arch.siar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SDAR: + vcpu->arch.sdar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIER: + vcpu->arch.sier[0] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIER2: + vcpu->arch.sier[1] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_SIER3: + vcpu->arch.sier[2] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_IAMR: + vcpu->arch.iamr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PSPB: + vcpu->arch.pspb = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DPDES: + if (cpu_has_feature(CPU_FTR_ARCH_300)) + vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1; + else + vcpu->arch.vcore->dpdes = set_reg_val(id, *val); + break; + case KVM_REG_PPC_VTB: + vcpu->arch.vcore->vtb = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DAWR: + vcpu->arch.dawr0 = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DAWRX: + vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP; + break; + case KVM_REG_PPC_DAWR1: + vcpu->arch.dawr1 = set_reg_val(id, *val); + break; + case KVM_REG_PPC_DAWRX1: + vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP; + break; + case KVM_REG_PPC_CIABR: + vcpu->arch.ciabr = set_reg_val(id, *val); + /* Don't allow setting breakpoints in hypervisor code */ + if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) + vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ + break; + case KVM_REG_PPC_CSIGR: + vcpu->arch.csigr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TACR: + vcpu->arch.tacr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TCSCR: + vcpu->arch.tcscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PID: + vcpu->arch.pid = set_reg_val(id, *val); + break; + case KVM_REG_PPC_ACOP: + vcpu->arch.acop = set_reg_val(id, *val); + break; + case KVM_REG_PPC_WORT: + vcpu->arch.wort = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TIDR: + vcpu->arch.tid = set_reg_val(id, *val); + break; + case KVM_REG_PPC_PSSCR: + vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; + break; + case KVM_REG_PPC_VPA_ADDR: + addr = set_reg_val(id, *val); + r = -EINVAL; + if (!addr && (vcpu->arch.slb_shadow.next_gpa || + vcpu->arch.dtl.next_gpa)) + break; + r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); + break; + case KVM_REG_PPC_VPA_SLB: + addr = val->vpaval.addr; + len = val->vpaval.length; + r = -EINVAL; + if (addr && !vcpu->arch.vpa.next_gpa) + break; + r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); + break; + case KVM_REG_PPC_VPA_DTL: + addr = val->vpaval.addr; + len = val->vpaval.length; + r = -EINVAL; + if (addr && (len < sizeof(struct dtl_entry) || + !vcpu->arch.vpa.next_gpa)) + break; + len -= len % sizeof(struct dtl_entry); + r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); + break; + case KVM_REG_PPC_TB_OFFSET: + { + /* round up to multiple of 2^24 */ + u64 tb_offset = ALIGN(set_reg_val(id, *val), 1UL << 24); + + /* + * Now that we know the timebase offset, update the + * decrementer expiry with a guest timebase value. If + * the userspace does not set DEC_EXPIRY, this ensures + * a migrated vcpu at least starts with an expired + * decrementer, which is better than a large one that + * causes a hang. + */ + if (!vcpu->arch.dec_expires && tb_offset) + vcpu->arch.dec_expires = get_tb() + tb_offset; + + vcpu->arch.vcore->tb_offset = tb_offset; + break; + } + case KVM_REG_PPC_LPCR: + kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); + break; + case KVM_REG_PPC_LPCR_64: + kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); + break; + case KVM_REG_PPC_PPR: + vcpu->arch.ppr = set_reg_val(id, *val); + break; +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + case KVM_REG_PPC_TFHAR: + vcpu->arch.tfhar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TFIAR: + vcpu->arch.tfiar = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TEXASR: + vcpu->arch.texasr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: + i = id - KVM_REG_PPC_TM_GPR0; + vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: + { + int j; + i = id - KVM_REG_PPC_TM_VSR0; + if (i < 32) + for (j = 0; j < TS_FPRWIDTH; j++) + vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; + else + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + vcpu->arch.vr_tm.vr[i-32] = val->vval; + else + r = -ENXIO; + break; + } + case KVM_REG_PPC_TM_CR: + vcpu->arch.cr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_XER: + vcpu->arch.xer_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_LR: + vcpu->arch.lr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_CTR: + vcpu->arch.ctr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_FPSCR: + vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_AMR: + vcpu->arch.amr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_PPR: + vcpu->arch.ppr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VRSAVE: + vcpu->arch.vrsave_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_VSCR: + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); + else + r = - ENXIO; + break; + case KVM_REG_PPC_TM_DSCR: + vcpu->arch.dscr_tm = set_reg_val(id, *val); + break; + case KVM_REG_PPC_TM_TAR: + vcpu->arch.tar_tm = set_reg_val(id, *val); + break; +#endif + case KVM_REG_PPC_ARCH_COMPAT: + r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); + break; + case KVM_REG_PPC_DEC_EXPIRY: + vcpu->arch.dec_expires = set_reg_val(id, *val); + break; + case KVM_REG_PPC_ONLINE: + i = set_reg_val(id, *val); + if (i && !vcpu->arch.online) + atomic_inc(&vcpu->arch.vcore->online_count); + else if (!i && vcpu->arch.online) + atomic_dec(&vcpu->arch.vcore->online_count); + vcpu->arch.online = i; + break; + case KVM_REG_PPC_PTCR: + vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); + break; + default: + r = -EINVAL; + break; + } + + return r; +} + +/* + * On POWER9, threads are independent and can be in different partitions. + * Therefore we consider each thread to be a subcore. + * There is a restriction that all threads have to be in the same + * MMU mode (radix or HPT), unfortunately, but since we only support + * HPT guests on a HPT host so far, that isn't an impediment yet. + */ +static int threads_per_vcore(struct kvm *kvm) +{ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return 1; + return threads_per_subcore; +} + +static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) +{ + struct kvmppc_vcore *vcore; + + vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); + + if (vcore == NULL) + return NULL; + + spin_lock_init(&vcore->lock); + spin_lock_init(&vcore->stoltb_lock); + rcuwait_init(&vcore->wait); + vcore->preempt_tb = TB_NIL; + vcore->lpcr = kvm->arch.lpcr; + vcore->first_vcpuid = id; + vcore->kvm = kvm; + INIT_LIST_HEAD(&vcore->preempt_list); + + return vcore; +} + +#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING +static struct debugfs_timings_element { + const char *name; + size_t offset; +} timings[] = { +#ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING + {"vcpu_entry", offsetof(struct kvm_vcpu, arch.vcpu_entry)}, + {"guest_entry", offsetof(struct kvm_vcpu, arch.guest_entry)}, + {"in_guest", offsetof(struct kvm_vcpu, arch.in_guest)}, + {"guest_exit", offsetof(struct kvm_vcpu, arch.guest_exit)}, + {"vcpu_exit", offsetof(struct kvm_vcpu, arch.vcpu_exit)}, + {"hypercall", offsetof(struct kvm_vcpu, arch.hcall)}, + {"page_fault", offsetof(struct kvm_vcpu, arch.pg_fault)}, +#else + {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, + {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, + {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, + {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, + {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, +#endif +}; + +#define N_TIMINGS (ARRAY_SIZE(timings)) + +struct debugfs_timings_state { + struct kvm_vcpu *vcpu; + unsigned int buflen; + char buf[N_TIMINGS * 100]; +}; + +static int debugfs_timings_open(struct inode *inode, struct file *file) +{ + struct kvm_vcpu *vcpu = inode->i_private; + struct debugfs_timings_state *p; + + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + return -ENOMEM; + + kvm_get_kvm(vcpu->kvm); + p->vcpu = vcpu; + file->private_data = p; + + return nonseekable_open(inode, file); +} + +static int debugfs_timings_release(struct inode *inode, struct file *file) +{ + struct debugfs_timings_state *p = file->private_data; + + kvm_put_kvm(p->vcpu->kvm); + kfree(p); + return 0; +} + +static ssize_t debugfs_timings_read(struct file *file, char __user *buf, + size_t len, loff_t *ppos) +{ + struct debugfs_timings_state *p = file->private_data; + struct kvm_vcpu *vcpu = p->vcpu; + char *s, *buf_end; + struct kvmhv_tb_accumulator tb; + u64 count; + loff_t pos; + ssize_t n; + int i, loops; + bool ok; + + if (!p->buflen) { + s = p->buf; + buf_end = s + sizeof(p->buf); + for (i = 0; i < N_TIMINGS; ++i) { + struct kvmhv_tb_accumulator *acc; + + acc = (struct kvmhv_tb_accumulator *) + ((unsigned long)vcpu + timings[i].offset); + ok = false; + for (loops = 0; loops < 1000; ++loops) { + count = acc->seqcount; + if (!(count & 1)) { + smp_rmb(); + tb = *acc; + smp_rmb(); + if (count == acc->seqcount) { + ok = true; + break; + } + } + udelay(1); + } + if (!ok) + snprintf(s, buf_end - s, "%s: stuck\n", + timings[i].name); + else + snprintf(s, buf_end - s, + "%s: %llu %llu %llu %llu\n", + timings[i].name, count / 2, + tb_to_ns(tb.tb_total), + tb_to_ns(tb.tb_min), + tb_to_ns(tb.tb_max)); + s += strlen(s); + } + p->buflen = s - p->buf; + } + + pos = *ppos; + if (pos >= p->buflen) + return 0; + if (len > p->buflen - pos) + len = p->buflen - pos; + n = copy_to_user(buf, p->buf + pos, len); + if (n) { + if (n == len) + return -EFAULT; + len -= n; + } + *ppos = pos + len; + return len; +} + +static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return -EACCES; +} + +static const struct file_operations debugfs_timings_ops = { + .owner = THIS_MODULE, + .open = debugfs_timings_open, + .release = debugfs_timings_release, + .read = debugfs_timings_read, + .write = debugfs_timings_write, + .llseek = generic_file_llseek, +}; + +/* Create a debugfs directory for the vcpu */ +static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) +{ + if (cpu_has_feature(CPU_FTR_ARCH_300) == IS_ENABLED(CONFIG_KVM_BOOK3S_HV_P9_TIMING)) + debugfs_create_file("timings", 0444, debugfs_dentry, vcpu, + &debugfs_timings_ops); + return 0; +} + +#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ +static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) +{ + return 0; +} +#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ + +static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) +{ + int err; + int core; + struct kvmppc_vcore *vcore; + struct kvm *kvm; + unsigned int id; + + kvm = vcpu->kvm; + id = vcpu->vcpu_id; + + vcpu->arch.shared = &vcpu->arch.shregs; +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE + /* + * The shared struct is never shared on HV, + * so we can always use host endianness + */ +#ifdef __BIG_ENDIAN__ + vcpu->arch.shared_big_endian = true; +#else + vcpu->arch.shared_big_endian = false; +#endif +#endif + vcpu->arch.mmcr[0] = MMCR0_FC; + if (cpu_has_feature(CPU_FTR_ARCH_31)) { + vcpu->arch.mmcr[0] |= MMCR0_PMCCEXT; + vcpu->arch.mmcra = MMCRA_BHRB_DISABLE; + } + + vcpu->arch.ctrl = CTRL_RUNLATCH; + /* default to host PVR, since we can't spoof it */ + kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); + spin_lock_init(&vcpu->arch.vpa_update_lock); + spin_lock_init(&vcpu->arch.tbacct_lock); + vcpu->arch.busy_preempt = TB_NIL; + vcpu->arch.shregs.msr = MSR_ME; + vcpu->arch.intr_msr = MSR_SF | MSR_ME; + + /* + * Set the default HFSCR for the guest from the host value. + * This value is only used on POWER9. + * On POWER9, we want to virtualize the doorbell facility, so we + * don't set the HFSCR_MSGP bit, and that causes those instructions + * to trap and then we emulate them. + */ + vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | + HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP; + if (cpu_has_feature(CPU_FTR_HVMODE)) { + vcpu->arch.hfscr &= mfspr(SPRN_HFSCR); +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) + vcpu->arch.hfscr |= HFSCR_TM; +#endif + } + if (cpu_has_feature(CPU_FTR_TM_COMP)) + vcpu->arch.hfscr |= HFSCR_TM; + + vcpu->arch.hfscr_permitted = vcpu->arch.hfscr; + + /* + * PM, EBB, TM are demand-faulted so start with it clear. + */ + vcpu->arch.hfscr &= ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM); + + kvmppc_mmu_book3s_hv_init(vcpu); + + vcpu->arch.state = KVMPPC_VCPU_NOTREADY; + + init_waitqueue_head(&vcpu->arch.cpu_run); + + mutex_lock(&kvm->lock); + vcore = NULL; + err = -EINVAL; + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { + pr_devel("KVM: VCPU ID too high\n"); + core = KVM_MAX_VCORES; + } else { + BUG_ON(kvm->arch.smt_mode != 1); + core = kvmppc_pack_vcpu_id(kvm, id); + } + } else { + core = id / kvm->arch.smt_mode; + } + if (core < KVM_MAX_VCORES) { + vcore = kvm->arch.vcores[core]; + if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { + pr_devel("KVM: collision on id %u", id); + vcore = NULL; + } else if (!vcore) { + /* + * Take mmu_setup_lock for mutual exclusion + * with kvmppc_update_lpcr(). + */ + err = -ENOMEM; + vcore = kvmppc_vcore_create(kvm, + id & ~(kvm->arch.smt_mode - 1)); + mutex_lock(&kvm->arch.mmu_setup_lock); + kvm->arch.vcores[core] = vcore; + kvm->arch.online_vcores++; + mutex_unlock(&kvm->arch.mmu_setup_lock); + } + } + mutex_unlock(&kvm->lock); + + if (!vcore) + return err; + + spin_lock(&vcore->lock); + ++vcore->num_threads; + spin_unlock(&vcore->lock); + vcpu->arch.vcore = vcore; + vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; + vcpu->arch.thread_cpu = -1; + vcpu->arch.prev_cpu = -1; + + vcpu->arch.cpu_type = KVM_CPU_3S_64; + kvmppc_sanity_check(vcpu); + + return 0; +} + +static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, + unsigned long flags) +{ + int err; + int esmt = 0; + + if (flags) + return -EINVAL; + if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) + return -EINVAL; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) { + /* + * On POWER8 (or POWER7), the threading mode is "strict", + * so we pack smt_mode vcpus per vcore. + */ + if (smt_mode > threads_per_subcore) + return -EINVAL; + } else { + /* + * On POWER9, the threading mode is "loose", + * so each vcpu gets its own vcore. + */ + esmt = smt_mode; + smt_mode = 1; + } + mutex_lock(&kvm->lock); + err = -EBUSY; + if (!kvm->arch.online_vcores) { + kvm->arch.smt_mode = smt_mode; + kvm->arch.emul_smt_mode = esmt; + err = 0; + } + mutex_unlock(&kvm->lock); + + return err; +} + +static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) +{ + if (vpa->pinned_addr) + kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, + vpa->dirty); +} + +static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) +{ + spin_lock(&vcpu->arch.vpa_update_lock); + unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); + unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); + unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); + spin_unlock(&vcpu->arch.vpa_update_lock); +} + +static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) +{ + /* Indicate we want to get back into the guest */ + return 1; +} + +static void kvmppc_set_timer(struct kvm_vcpu *vcpu) +{ + unsigned long dec_nsec, now; + + now = get_tb(); + if (now > kvmppc_dec_expires_host_tb(vcpu)) { + /* decrementer has already gone negative */ + kvmppc_core_queue_dec(vcpu); + kvmppc_core_prepare_to_enter(vcpu); + return; + } + dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now); + hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); + vcpu->arch.timer_running = 1; +} + +extern int __kvmppc_vcore_entry(void); + +static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, + struct kvm_vcpu *vcpu, u64 tb) +{ + u64 now; + + if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) + return; + spin_lock_irq(&vcpu->arch.tbacct_lock); + now = tb; + vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - + vcpu->arch.stolen_logged; + vcpu->arch.busy_preempt = now; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + spin_unlock_irq(&vcpu->arch.tbacct_lock); + --vc->n_runnable; + WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); +} + +static int kvmppc_grab_hwthread(int cpu) +{ + struct paca_struct *tpaca; + long timeout = 10000; + + tpaca = paca_ptrs[cpu]; + + /* Ensure the thread won't go into the kernel if it wakes */ + tpaca->kvm_hstate.kvm_vcpu = NULL; + tpaca->kvm_hstate.kvm_vcore = NULL; + tpaca->kvm_hstate.napping = 0; + smp_wmb(); + tpaca->kvm_hstate.hwthread_req = 1; + + /* + * If the thread is already executing in the kernel (e.g. handling + * a stray interrupt), wait for it to get back to nap mode. + * The smp_mb() is to ensure that our setting of hwthread_req + * is visible before we look at hwthread_state, so if this + * races with the code at system_reset_pSeries and the thread + * misses our setting of hwthread_req, we are sure to see its + * setting of hwthread_state, and vice versa. + */ + smp_mb(); + while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { + if (--timeout <= 0) { + pr_err("KVM: couldn't grab cpu %d\n", cpu); + return -EBUSY; + } + udelay(1); + } + return 0; +} + +static void kvmppc_release_hwthread(int cpu) +{ + struct paca_struct *tpaca; + + tpaca = paca_ptrs[cpu]; + tpaca->kvm_hstate.hwthread_req = 0; + tpaca->kvm_hstate.kvm_vcpu = NULL; + tpaca->kvm_hstate.kvm_vcore = NULL; + tpaca->kvm_hstate.kvm_split_mode = NULL; +} + +static DEFINE_PER_CPU(struct kvm *, cpu_in_guest); + +static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) +{ + struct kvm_nested_guest *nested = vcpu->arch.nested; + cpumask_t *need_tlb_flush; + int i; + + if (nested) + need_tlb_flush = &nested->need_tlb_flush; + else + need_tlb_flush = &kvm->arch.need_tlb_flush; + + cpu = cpu_first_tlb_thread_sibling(cpu); + for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); + i += cpu_tlb_thread_sibling_step()) + cpumask_set_cpu(i, need_tlb_flush); + + /* + * Make sure setting of bit in need_tlb_flush precedes testing of + * cpu_in_guest. The matching barrier on the other side is hwsync + * when switching to guest MMU mode, which happens between + * cpu_in_guest being set to the guest kvm, and need_tlb_flush bit + * being tested. + */ + smp_mb(); + + for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); + i += cpu_tlb_thread_sibling_step()) { + struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i); + + if (running == kvm) + smp_call_function_single(i, do_nothing, NULL, 1); + } +} + +static void do_migrate_away_vcpu(void *arg) +{ + struct kvm_vcpu *vcpu = arg; + struct kvm *kvm = vcpu->kvm; + + /* + * If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync; + * ptesync sequence on the old CPU before migrating to a new one, in + * case we interrupted the guest between a tlbie ; eieio ; + * tlbsync; ptesync sequence. + * + * Otherwise, ptesync is sufficient for ordering tlbiel sequences. + */ + if (kvm->arch.lpcr & LPCR_GTSE) + asm volatile("eieio; tlbsync; ptesync"); + else + asm volatile("ptesync"); +} + +static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) +{ + struct kvm_nested_guest *nested = vcpu->arch.nested; + struct kvm *kvm = vcpu->kvm; + int prev_cpu; + + if (!cpu_has_feature(CPU_FTR_HVMODE)) + return; + + if (nested) + prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; + else + prev_cpu = vcpu->arch.prev_cpu; + + /* + * With radix, the guest can do TLB invalidations itself, + * and it could choose to use the local form (tlbiel) if + * it is invalidating a translation that has only ever been + * used on one vcpu. However, that doesn't mean it has + * only ever been used on one physical cpu, since vcpus + * can move around between pcpus. To cope with this, when + * a vcpu moves from one pcpu to another, we need to tell + * any vcpus running on the same core as this vcpu previously + * ran to flush the TLB. + */ + if (prev_cpu != pcpu) { + if (prev_cpu >= 0) { + if (cpu_first_tlb_thread_sibling(prev_cpu) != + cpu_first_tlb_thread_sibling(pcpu)) + radix_flush_cpu(kvm, prev_cpu, vcpu); + + smp_call_function_single(prev_cpu, + do_migrate_away_vcpu, vcpu, 1); + } + if (nested) + nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu; + else + vcpu->arch.prev_cpu = pcpu; + } +} + +static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) +{ + int cpu; + struct paca_struct *tpaca; + + cpu = vc->pcpu; + if (vcpu) { + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } + cpu += vcpu->arch.ptid; + vcpu->cpu = vc->pcpu; + vcpu->arch.thread_cpu = cpu; + } + tpaca = paca_ptrs[cpu]; + tpaca->kvm_hstate.kvm_vcpu = vcpu; + tpaca->kvm_hstate.ptid = cpu - vc->pcpu; + tpaca->kvm_hstate.fake_suspend = 0; + /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ + smp_wmb(); + tpaca->kvm_hstate.kvm_vcore = vc; + if (cpu != smp_processor_id()) + kvmppc_ipi_thread(cpu); +} + +static void kvmppc_wait_for_nap(int n_threads) +{ + int cpu = smp_processor_id(); + int i, loops; + + if (n_threads <= 1) + return; + for (loops = 0; loops < 1000000; ++loops) { + /* + * Check if all threads are finished. + * We set the vcore pointer when starting a thread + * and the thread clears it when finished, so we look + * for any threads that still have a non-NULL vcore ptr. + */ + for (i = 1; i < n_threads; ++i) + if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) + break; + if (i == n_threads) { + HMT_medium(); + return; + } + HMT_low(); + } + HMT_medium(); + for (i = 1; i < n_threads; ++i) + if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) + pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); +} + +/* + * Check that we are on thread 0 and that any other threads in + * this core are off-line. Then grab the threads so they can't + * enter the kernel. + */ +static int on_primary_thread(void) +{ + int cpu = smp_processor_id(); + int thr; + + /* Are we on a primary subcore? */ + if (cpu_thread_in_subcore(cpu)) + return 0; + + thr = 0; + while (++thr < threads_per_subcore) + if (cpu_online(cpu + thr)) + return 0; + + /* Grab all hw threads so they can't go into the kernel */ + for (thr = 1; thr < threads_per_subcore; ++thr) { + if (kvmppc_grab_hwthread(cpu + thr)) { + /* Couldn't grab one; let the others go */ + do { + kvmppc_release_hwthread(cpu + thr); + } while (--thr > 0); + return 0; + } + } + return 1; +} + +/* + * A list of virtual cores for each physical CPU. + * These are vcores that could run but their runner VCPU tasks are + * (or may be) preempted. + */ +struct preempted_vcore_list { + struct list_head list; + spinlock_t lock; +}; + +static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); + +static void init_vcore_lists(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); + spin_lock_init(&lp->lock); + INIT_LIST_HEAD(&lp->list); + } +} + +static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) +{ + struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + vc->vcore_state = VCORE_PREEMPT; + vc->pcpu = smp_processor_id(); + if (vc->num_threads < threads_per_vcore(vc->kvm)) { + spin_lock(&lp->lock); + list_add_tail(&vc->preempt_list, &lp->list); + spin_unlock(&lp->lock); + } + + /* Start accumulating stolen time */ + kvmppc_core_start_stolen(vc, mftb()); +} + +static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) +{ + struct preempted_vcore_list *lp; + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + kvmppc_core_end_stolen(vc, mftb()); + if (!list_empty(&vc->preempt_list)) { + lp = &per_cpu(preempted_vcores, vc->pcpu); + spin_lock(&lp->lock); + list_del_init(&vc->preempt_list); + spin_unlock(&lp->lock); + } + vc->vcore_state = VCORE_INACTIVE; +} + +/* + * This stores information about the virtual cores currently + * assigned to a physical core. + */ +struct core_info { + int n_subcores; + int max_subcore_threads; + int total_threads; + int subcore_threads[MAX_SUBCORES]; + struct kvmppc_vcore *vc[MAX_SUBCORES]; +}; + +/* + * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 + * respectively in 2-way micro-threading (split-core) mode on POWER8. + */ +static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; + +static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) +{ + memset(cip, 0, sizeof(*cip)); + cip->n_subcores = 1; + cip->max_subcore_threads = vc->num_threads; + cip->total_threads = vc->num_threads; + cip->subcore_threads[0] = vc->num_threads; + cip->vc[0] = vc; +} + +static bool subcore_config_ok(int n_subcores, int n_threads) +{ + /* + * POWER9 "SMT4" cores are permanently in what is effectively a 4-way + * split-core mode, with one thread per subcore. + */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return n_subcores <= 4 && n_threads == 1; + + /* On POWER8, can only dynamically split if unsplit to begin with */ + if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) + return false; + if (n_subcores > MAX_SUBCORES) + return false; + if (n_subcores > 1) { + if (!(dynamic_mt_modes & 2)) + n_subcores = 4; + if (n_subcores > 2 && !(dynamic_mt_modes & 4)) + return false; + } + + return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; +} + +static void init_vcore_to_run(struct kvmppc_vcore *vc) +{ + vc->entry_exit_map = 0; + vc->in_guest = 0; + vc->napping_threads = 0; + vc->conferring_threads = 0; + vc->tb_offset_applied = 0; +} + +static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) +{ + int n_threads = vc->num_threads; + int sub; + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return false; + + /* In one_vm_per_core mode, require all vcores to be from the same vm */ + if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm) + return false; + + if (n_threads < cip->max_subcore_threads) + n_threads = cip->max_subcore_threads; + if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) + return false; + cip->max_subcore_threads = n_threads; + + sub = cip->n_subcores; + ++cip->n_subcores; + cip->total_threads += vc->num_threads; + cip->subcore_threads[sub] = vc->num_threads; + cip->vc[sub] = vc; + init_vcore_to_run(vc); + list_del_init(&vc->preempt_list); + + return true; +} + +/* + * Work out whether it is possible to piggyback the execution of + * vcore *pvc onto the execution of the other vcores described in *cip. + */ +static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, + int target_threads) +{ + if (cip->total_threads + pvc->num_threads > target_threads) + return false; + + return can_dynamic_split(pvc, cip); +} + +static void prepare_threads(struct kvmppc_vcore *vc) +{ + int i; + struct kvm_vcpu *vcpu; + + for_each_runnable_thread(i, vcpu, vc) { + if (signal_pending(vcpu->arch.run_task)) + vcpu->arch.ret = -EINTR; + else if (vcpu->arch.vpa.update_pending || + vcpu->arch.slb_shadow.update_pending || + vcpu->arch.dtl.update_pending) + vcpu->arch.ret = RESUME_GUEST; + else + continue; + kvmppc_remove_runnable(vc, vcpu, mftb()); + wake_up(&vcpu->arch.cpu_run); + } +} + +static void collect_piggybacks(struct core_info *cip, int target_threads) +{ + struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); + struct kvmppc_vcore *pvc, *vcnext; + + spin_lock(&lp->lock); + list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { + if (!spin_trylock(&pvc->lock)) + continue; + prepare_threads(pvc); + if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) { + list_del_init(&pvc->preempt_list); + if (pvc->runner == NULL) { + pvc->vcore_state = VCORE_INACTIVE; + kvmppc_core_end_stolen(pvc, mftb()); + } + spin_unlock(&pvc->lock); + continue; + } + if (!can_piggyback(pvc, cip, target_threads)) { + spin_unlock(&pvc->lock); + continue; + } + kvmppc_core_end_stolen(pvc, mftb()); + pvc->vcore_state = VCORE_PIGGYBACK; + if (cip->total_threads >= target_threads) + break; + } + spin_unlock(&lp->lock); +} + +static bool recheck_signals_and_mmu(struct core_info *cip) +{ + int sub, i; + struct kvm_vcpu *vcpu; + struct kvmppc_vcore *vc; + + for (sub = 0; sub < cip->n_subcores; ++sub) { + vc = cip->vc[sub]; + if (!vc->kvm->arch.mmu_ready) + return true; + for_each_runnable_thread(i, vcpu, vc) + if (signal_pending(vcpu->arch.run_task)) + return true; + } + return false; +} + +static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) +{ + int still_running = 0, i; + u64 now; + long ret; + struct kvm_vcpu *vcpu; + + spin_lock(&vc->lock); + now = get_tb(); + for_each_runnable_thread(i, vcpu, vc) { + /* + * It's safe to unlock the vcore in the loop here, because + * for_each_runnable_thread() is safe against removal of + * the vcpu, and the vcore state is VCORE_EXITING here, + * so any vcpus becoming runnable will have their arch.trap + * set to zero and can't actually run in the guest. + */ + spin_unlock(&vc->lock); + /* cancel pending dec exception if dec is positive */ + if (now < kvmppc_dec_expires_host_tb(vcpu) && + kvmppc_core_pending_dec(vcpu)) + kvmppc_core_dequeue_dec(vcpu); + + trace_kvm_guest_exit(vcpu); + + ret = RESUME_GUEST; + if (vcpu->arch.trap) + ret = kvmppc_handle_exit_hv(vcpu, + vcpu->arch.run_task); + + vcpu->arch.ret = ret; + vcpu->arch.trap = 0; + + spin_lock(&vc->lock); + if (is_kvmppc_resume_guest(vcpu->arch.ret)) { + if (vcpu->arch.pending_exceptions) + kvmppc_core_prepare_to_enter(vcpu); + if (vcpu->arch.ceded) + kvmppc_set_timer(vcpu); + else + ++still_running; + } else { + kvmppc_remove_runnable(vc, vcpu, mftb()); + wake_up(&vcpu->arch.cpu_run); + } + } + if (!is_master) { + if (still_running > 0) { + kvmppc_vcore_preempt(vc); + } else if (vc->runner) { + vc->vcore_state = VCORE_PREEMPT; + kvmppc_core_start_stolen(vc, mftb()); + } else { + vc->vcore_state = VCORE_INACTIVE; + } + if (vc->n_runnable > 0 && vc->runner == NULL) { + /* make sure there's a candidate runner awake */ + i = -1; + vcpu = next_runnable_thread(vc, &i); + wake_up(&vcpu->arch.cpu_run); + } + } + spin_unlock(&vc->lock); +} + +/* + * Clear core from the list of active host cores as we are about to + * enter the guest. Only do this if it is the primary thread of the + * core (not if a subcore) that is entering the guest. + */ +static inline int kvmppc_clear_host_core(unsigned int cpu) +{ + int core; + + if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) + return 0; + /* + * Memory barrier can be omitted here as we will do a smp_wmb() + * later in kvmppc_start_thread and we need ensure that state is + * visible to other CPUs only after we enter guest. + */ + core = cpu >> threads_shift; + kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; + return 0; +} + +/* + * Advertise this core as an active host core since we exited the guest + * Only need to do this if it is the primary thread of the core that is + * exiting. + */ +static inline int kvmppc_set_host_core(unsigned int cpu) +{ + int core; + + if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) + return 0; + + /* + * Memory barrier can be omitted here because we do a spin_unlock + * immediately after this which provides the memory barrier. + */ + core = cpu >> threads_shift; + kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; + return 0; +} + +static void set_irq_happened(int trap) +{ + switch (trap) { + case BOOK3S_INTERRUPT_EXTERNAL: + local_paca->irq_happened |= PACA_IRQ_EE; + break; + case BOOK3S_INTERRUPT_H_DOORBELL: + local_paca->irq_happened |= PACA_IRQ_DBELL; + break; + case BOOK3S_INTERRUPT_HMI: + local_paca->irq_happened |= PACA_IRQ_HMI; + break; + case BOOK3S_INTERRUPT_SYSTEM_RESET: + replay_system_reset(); + break; + } +} + +/* + * Run a set of guest threads on a physical core. + * Called with vc->lock held. + */ +static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) +{ + struct kvm_vcpu *vcpu; + int i; + int srcu_idx; + struct core_info core_info; + struct kvmppc_vcore *pvc; + struct kvm_split_mode split_info, *sip; + int split, subcore_size, active; + int sub; + bool thr0_done; + unsigned long cmd_bit, stat_bit; + int pcpu, thr; + int target_threads; + int controlled_threads; + int trap; + bool is_power8; + + if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300))) + return; + + /* + * Remove from the list any threads that have a signal pending + * or need a VPA update done + */ + prepare_threads(vc); + + /* if the runner is no longer runnable, let the caller pick a new one */ + if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) + return; + + /* + * Initialize *vc. + */ + init_vcore_to_run(vc); + vc->preempt_tb = TB_NIL; + + /* + * Number of threads that we will be controlling: the same as + * the number of threads per subcore, except on POWER9, + * where it's 1 because the threads are (mostly) independent. + */ + controlled_threads = threads_per_vcore(vc->kvm); + + /* + * Make sure we are running on primary threads, and that secondary + * threads are offline. Also check if the number of threads in this + * guest are greater than the current system threads per guest. + */ + if ((controlled_threads > 1) && + ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { + for_each_runnable_thread(i, vcpu, vc) { + vcpu->arch.ret = -EBUSY; + kvmppc_remove_runnable(vc, vcpu, mftb()); + wake_up(&vcpu->arch.cpu_run); + } + goto out; + } + + /* + * See if we could run any other vcores on the physical core + * along with this one. + */ + init_core_info(&core_info, vc); + pcpu = smp_processor_id(); + target_threads = controlled_threads; + if (target_smt_mode && target_smt_mode < target_threads) + target_threads = target_smt_mode; + if (vc->num_threads < target_threads) + collect_piggybacks(&core_info, target_threads); + + /* + * Hard-disable interrupts, and check resched flag and signals. + * If we need to reschedule or deliver a signal, clean up + * and return without going into the guest(s). + * If the mmu_ready flag has been cleared, don't go into the + * guest because that means a HPT resize operation is in progress. + */ + local_irq_disable(); + hard_irq_disable(); + if (lazy_irq_pending() || need_resched() || + recheck_signals_and_mmu(&core_info)) { + local_irq_enable(); + vc->vcore_state = VCORE_INACTIVE; + /* Unlock all except the primary vcore */ + for (sub = 1; sub < core_info.n_subcores; ++sub) { + pvc = core_info.vc[sub]; + /* Put back on to the preempted vcores list */ + kvmppc_vcore_preempt(pvc); + spin_unlock(&pvc->lock); + } + for (i = 0; i < controlled_threads; ++i) + kvmppc_release_hwthread(pcpu + i); + return; + } + + kvmppc_clear_host_core(pcpu); + + /* Decide on micro-threading (split-core) mode */ + subcore_size = threads_per_subcore; + cmd_bit = stat_bit = 0; + split = core_info.n_subcores; + sip = NULL; + is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S); + + if (split > 1) { + sip = &split_info; + memset(&split_info, 0, sizeof(split_info)); + for (sub = 0; sub < core_info.n_subcores; ++sub) + split_info.vc[sub] = core_info.vc[sub]; + + if (is_power8) { + if (split == 2 && (dynamic_mt_modes & 2)) { + cmd_bit = HID0_POWER8_1TO2LPAR; + stat_bit = HID0_POWER8_2LPARMODE; + } else { + split = 4; + cmd_bit = HID0_POWER8_1TO4LPAR; + stat_bit = HID0_POWER8_4LPARMODE; + } + subcore_size = MAX_SMT_THREADS / split; + split_info.rpr = mfspr(SPRN_RPR); + split_info.pmmar = mfspr(SPRN_PMMAR); + split_info.ldbar = mfspr(SPRN_LDBAR); + split_info.subcore_size = subcore_size; + } else { + split_info.subcore_size = 1; + } + + /* order writes to split_info before kvm_split_mode pointer */ + smp_wmb(); + } + + for (thr = 0; thr < controlled_threads; ++thr) { + struct paca_struct *paca = paca_ptrs[pcpu + thr]; + + paca->kvm_hstate.napping = 0; + paca->kvm_hstate.kvm_split_mode = sip; + } + + /* Initiate micro-threading (split-core) on POWER8 if required */ + if (cmd_bit) { + unsigned long hid0 = mfspr(SPRN_HID0); + + hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; + mb(); + mtspr(SPRN_HID0, hid0); + isync(); + for (;;) { + hid0 = mfspr(SPRN_HID0); + if (hid0 & stat_bit) + break; + cpu_relax(); + } + } + + /* + * On POWER8, set RWMR register. + * Since it only affects PURR and SPURR, it doesn't affect + * the host, so we don't save/restore the host value. + */ + if (is_power8) { + unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; + int n_online = atomic_read(&vc->online_count); + + /* + * Use the 8-thread value if we're doing split-core + * or if the vcore's online count looks bogus. + */ + if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && + n_online >= 1 && n_online <= MAX_SMT_THREADS) + rwmr_val = p8_rwmr_values[n_online]; + mtspr(SPRN_RWMR, rwmr_val); + } + + /* Start all the threads */ + active = 0; + for (sub = 0; sub < core_info.n_subcores; ++sub) { + thr = is_power8 ? subcore_thread_map[sub] : sub; + thr0_done = false; + active |= 1 << thr; + pvc = core_info.vc[sub]; + pvc->pcpu = pcpu + thr; + for_each_runnable_thread(i, vcpu, pvc) { + /* + * XXX: is kvmppc_start_thread called too late here? + * It updates vcpu->cpu and vcpu->arch.thread_cpu + * which are used by kvmppc_fast_vcpu_kick_hv(), but + * kick is called after new exceptions become available + * and exceptions are checked earlier than here, by + * kvmppc_core_prepare_to_enter. + */ + kvmppc_start_thread(vcpu, pvc); + kvmppc_update_vpa_dispatch(vcpu, pvc); + trace_kvm_guest_enter(vcpu); + if (!vcpu->arch.ptid) + thr0_done = true; + active |= 1 << (thr + vcpu->arch.ptid); + } + /* + * We need to start the first thread of each subcore + * even if it doesn't have a vcpu. + */ + if (!thr0_done) + kvmppc_start_thread(NULL, pvc); + } + + /* + * Ensure that split_info.do_nap is set after setting + * the vcore pointer in the PACA of the secondaries. + */ + smp_mb(); + + /* + * When doing micro-threading, poke the inactive threads as well. + * This gets them to the nap instruction after kvm_do_nap, + * which reduces the time taken to unsplit later. + */ + if (cmd_bit) { + split_info.do_nap = 1; /* ask secondaries to nap when done */ + for (thr = 1; thr < threads_per_subcore; ++thr) + if (!(active & (1 << thr))) + kvmppc_ipi_thread(pcpu + thr); + } + + vc->vcore_state = VCORE_RUNNING; + preempt_disable(); + + trace_kvmppc_run_core(vc, 0); + + for (sub = 0; sub < core_info.n_subcores; ++sub) + spin_unlock(&core_info.vc[sub]->lock); + + guest_timing_enter_irqoff(); + + srcu_idx = srcu_read_lock(&vc->kvm->srcu); + + guest_state_enter_irqoff(); + this_cpu_disable_ftrace(); + + trap = __kvmppc_vcore_entry(); + + this_cpu_enable_ftrace(); + guest_state_exit_irqoff(); + + srcu_read_unlock(&vc->kvm->srcu, srcu_idx); + + set_irq_happened(trap); + + spin_lock(&vc->lock); + /* prevent other vcpu threads from doing kvmppc_start_thread() now */ + vc->vcore_state = VCORE_EXITING; + + /* wait for secondary threads to finish writing their state to memory */ + kvmppc_wait_for_nap(controlled_threads); + + /* Return to whole-core mode if we split the core earlier */ + if (cmd_bit) { + unsigned long hid0 = mfspr(SPRN_HID0); + unsigned long loops = 0; + + hid0 &= ~HID0_POWER8_DYNLPARDIS; + stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; + mb(); + mtspr(SPRN_HID0, hid0); + isync(); + for (;;) { + hid0 = mfspr(SPRN_HID0); + if (!(hid0 & stat_bit)) + break; + cpu_relax(); + ++loops; + } + split_info.do_nap = 0; + } + + kvmppc_set_host_core(pcpu); + + if (!vtime_accounting_enabled_this_cpu()) { + local_irq_enable(); + /* + * Service IRQs here before guest_timing_exit_irqoff() so any + * ticks that occurred while running the guest are accounted to + * the guest. If vtime accounting is enabled, accounting uses + * TB rather than ticks, so it can be done without enabling + * interrupts here, which has the problem that it accounts + * interrupt processing overhead to the host. + */ + local_irq_disable(); + } + guest_timing_exit_irqoff(); + + local_irq_enable(); + + /* Let secondaries go back to the offline loop */ + for (i = 0; i < controlled_threads; ++i) { + kvmppc_release_hwthread(pcpu + i); + if (sip && sip->napped[i]) + kvmppc_ipi_thread(pcpu + i); + } + + spin_unlock(&vc->lock); + + /* make sure updates to secondary vcpu structs are visible now */ + smp_mb(); + + preempt_enable(); + + for (sub = 0; sub < core_info.n_subcores; ++sub) { + pvc = core_info.vc[sub]; + post_guest_process(pvc, pvc == vc); + } + + spin_lock(&vc->lock); + + out: + vc->vcore_state = VCORE_INACTIVE; + trace_kvmppc_run_core(vc, 1); +} + +static inline bool hcall_is_xics(unsigned long req) +{ + return req == H_EOI || req == H_CPPR || req == H_IPI || + req == H_IPOLL || req == H_XIRR || req == H_XIRR_X; +} + +static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu) +{ + struct lppaca *lp = vcpu->arch.vpa.pinned_addr; + if (lp) { + u32 yield_count = be32_to_cpu(lp->yield_count) + 1; + lp->yield_count = cpu_to_be32(yield_count); + vcpu->arch.vpa.dirty = 1; + } +} + +/* call our hypervisor to load up HV regs and go */ +static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb) +{ + struct kvmppc_vcore *vc = vcpu->arch.vcore; + unsigned long host_psscr; + unsigned long msr; + struct hv_guest_state hvregs; + struct p9_host_os_sprs host_os_sprs; + s64 dec; + int trap; + + msr = mfmsr(); + + save_p9_host_os_sprs(&host_os_sprs); + + /* + * We need to save and restore the guest visible part of the + * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor + * doesn't do this for us. Note only required if pseries since + * this is done in kvmhv_vcpu_entry_p9() below otherwise. + */ + host_psscr = mfspr(SPRN_PSSCR_PR); + + kvmppc_msr_hard_disable_set_facilities(vcpu, msr); + if (lazy_irq_pending()) + return 0; + + if (unlikely(load_vcpu_state(vcpu, &host_os_sprs))) + msr = mfmsr(); /* TM restore can update msr */ + + if (vcpu->arch.psscr != host_psscr) + mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); + + kvmhv_save_hv_regs(vcpu, &hvregs); + hvregs.lpcr = lpcr; + hvregs.amor = ~0; + vcpu->arch.regs.msr = vcpu->arch.shregs.msr; + hvregs.version = HV_GUEST_STATE_VERSION; + if (vcpu->arch.nested) { + hvregs.lpid = vcpu->arch.nested->shadow_lpid; + hvregs.vcpu_token = vcpu->arch.nested_vcpu_id; + } else { + hvregs.lpid = vcpu->kvm->arch.lpid; + hvregs.vcpu_token = vcpu->vcpu_id; + } + hvregs.hdec_expiry = time_limit; + + /* + * When setting DEC, we must always deal with irq_work_raise + * via NMI vs setting DEC. The problem occurs right as we + * switch into guest mode if a NMI hits and sets pending work + * and sets DEC, then that will apply to the guest and not + * bring us back to the host. + * + * irq_work_raise could check a flag (or possibly LPCR[HDICE] + * for example) and set HDEC to 1? That wouldn't solve the + * nested hv case which needs to abort the hcall or zero the + * time limit. + * + * XXX: Another day's problem. + */ + mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb); + + mtspr(SPRN_DAR, vcpu->arch.shregs.dar); + mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr); + switch_pmu_to_guest(vcpu, &host_os_sprs); + accumulate_time(vcpu, &vcpu->arch.in_guest); + trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs), + __pa(&vcpu->arch.regs)); + accumulate_time(vcpu, &vcpu->arch.guest_exit); + kvmhv_restore_hv_return_state(vcpu, &hvregs); + switch_pmu_to_host(vcpu, &host_os_sprs); + vcpu->arch.shregs.msr = vcpu->arch.regs.msr; + vcpu->arch.shregs.dar = mfspr(SPRN_DAR); + vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR); + vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); + + store_vcpu_state(vcpu); + + dec = mfspr(SPRN_DEC); + if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */ + dec = (s32) dec; + *tb = mftb(); + vcpu->arch.dec_expires = dec + (*tb + vc->tb_offset); + + timer_rearm_host_dec(*tb); + + restore_p9_host_os_sprs(vcpu, &host_os_sprs); + if (vcpu->arch.psscr != host_psscr) + mtspr(SPRN_PSSCR_PR, host_psscr); + + return trap; +} + +/* + * Guest entry for POWER9 and later CPUs. + */ +static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, + unsigned long lpcr, u64 *tb) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_nested_guest *nested = vcpu->arch.nested; + u64 next_timer; + int trap; + + next_timer = timer_get_next_tb(); + if (*tb >= next_timer) + return BOOK3S_INTERRUPT_HV_DECREMENTER; + if (next_timer < time_limit) + time_limit = next_timer; + else if (*tb >= time_limit) /* nested time limit */ + return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER; + + vcpu->arch.ceded = 0; + + vcpu_vpa_increment_dispatch(vcpu); + + if (kvmhv_on_pseries()) { + trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb); + + /* H_CEDE has to be handled now, not later */ + if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested && + kvmppc_get_gpr(vcpu, 3) == H_CEDE) { + kvmppc_cede(vcpu); + kvmppc_set_gpr(vcpu, 3, 0); + trap = 0; + } + + } else if (nested) { + __this_cpu_write(cpu_in_guest, kvm); + trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); + __this_cpu_write(cpu_in_guest, NULL); + + } else { + kvmppc_xive_push_vcpu(vcpu); + + __this_cpu_write(cpu_in_guest, kvm); + trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); + __this_cpu_write(cpu_in_guest, NULL); + + if (trap == BOOK3S_INTERRUPT_SYSCALL && + !(vcpu->arch.shregs.msr & MSR_PR)) { + unsigned long req = kvmppc_get_gpr(vcpu, 3); + + /* + * XIVE rearm and XICS hcalls must be handled + * before xive context is pulled (is this + * true?) + */ + if (req == H_CEDE) { + /* H_CEDE has to be handled now */ + kvmppc_cede(vcpu); + if (!kvmppc_xive_rearm_escalation(vcpu)) { + /* + * Pending escalation so abort + * the cede. + */ + vcpu->arch.ceded = 0; + } + kvmppc_set_gpr(vcpu, 3, 0); + trap = 0; + + } else if (req == H_ENTER_NESTED) { + /* + * L2 should not run with the L1 + * context so rearm and pull it. + */ + if (!kvmppc_xive_rearm_escalation(vcpu)) { + /* + * Pending escalation so abort + * H_ENTER_NESTED. + */ + kvmppc_set_gpr(vcpu, 3, 0); + trap = 0; + } + + } else if (hcall_is_xics(req)) { + int ret; + + ret = kvmppc_xive_xics_hcall(vcpu, req); + if (ret != H_TOO_HARD) { + kvmppc_set_gpr(vcpu, 3, ret); + trap = 0; + } + } + } + kvmppc_xive_pull_vcpu(vcpu); + + if (kvm_is_radix(kvm)) + vcpu->arch.slb_max = 0; + } + + vcpu_vpa_increment_dispatch(vcpu); + + return trap; +} + +/* + * Wait for some other vcpu thread to execute us, and + * wake us up when we need to handle something in the host. + */ +static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, + struct kvm_vcpu *vcpu, int wait_state) +{ + DEFINE_WAIT(wait); + + prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { + spin_unlock(&vc->lock); + schedule(); + spin_lock(&vc->lock); + } + finish_wait(&vcpu->arch.cpu_run, &wait); +} + +static void grow_halt_poll_ns(struct kvmppc_vcore *vc) +{ + if (!halt_poll_ns_grow) + return; + + vc->halt_poll_ns *= halt_poll_ns_grow; + if (vc->halt_poll_ns < halt_poll_ns_grow_start) + vc->halt_poll_ns = halt_poll_ns_grow_start; +} + +static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) +{ + if (halt_poll_ns_shrink == 0) + vc->halt_poll_ns = 0; + else + vc->halt_poll_ns /= halt_poll_ns_shrink; +} + +#ifdef CONFIG_KVM_XICS +static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) +{ + if (!xics_on_xive()) + return false; + return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr < + vcpu->arch.xive_saved_state.cppr; +} +#else +static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) +{ + return false; +} +#endif /* CONFIG_KVM_XICS */ + +static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu) +{ + if (vcpu->arch.pending_exceptions || vcpu->arch.prodded || + kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu)) + return true; + + return false; +} + +static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu) +{ + if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu)) + return true; + return false; +} + +/* + * Check to see if any of the runnable vcpus on the vcore have pending + * exceptions or are no longer ceded + */ +static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) +{ + struct kvm_vcpu *vcpu; + int i; + + for_each_runnable_thread(i, vcpu, vc) { + if (kvmppc_vcpu_check_block(vcpu)) + return 1; + } + + return 0; +} + +/* + * All the vcpus in this vcore are idle, so wait for a decrementer + * or external interrupt to one of the vcpus. vc->lock is held. + */ +static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) +{ + ktime_t cur, start_poll, start_wait; + int do_sleep = 1; + u64 block_ns; + + WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); + + /* Poll for pending exceptions and ceded state */ + cur = start_poll = ktime_get(); + if (vc->halt_poll_ns) { + ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); + ++vc->runner->stat.generic.halt_attempted_poll; + + vc->vcore_state = VCORE_POLLING; + spin_unlock(&vc->lock); + + do { + if (kvmppc_vcore_check_block(vc)) { + do_sleep = 0; + break; + } + cur = ktime_get(); + } while (kvm_vcpu_can_poll(cur, stop)); + + spin_lock(&vc->lock); + vc->vcore_state = VCORE_INACTIVE; + + if (!do_sleep) { + ++vc->runner->stat.generic.halt_successful_poll; + goto out; + } + } + + prepare_to_rcuwait(&vc->wait); + set_current_state(TASK_INTERRUPTIBLE); + if (kvmppc_vcore_check_block(vc)) { + finish_rcuwait(&vc->wait); + do_sleep = 0; + /* If we polled, count this as a successful poll */ + if (vc->halt_poll_ns) + ++vc->runner->stat.generic.halt_successful_poll; + goto out; + } + + start_wait = ktime_get(); + + vc->vcore_state = VCORE_SLEEPING; + trace_kvmppc_vcore_blocked(vc->runner, 0); + spin_unlock(&vc->lock); + schedule(); + finish_rcuwait(&vc->wait); + spin_lock(&vc->lock); + vc->vcore_state = VCORE_INACTIVE; + trace_kvmppc_vcore_blocked(vc->runner, 1); + ++vc->runner->stat.halt_successful_wait; + + cur = ktime_get(); + +out: + block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); + + /* Attribute wait time */ + if (do_sleep) { + vc->runner->stat.generic.halt_wait_ns += + ktime_to_ns(cur) - ktime_to_ns(start_wait); + KVM_STATS_LOG_HIST_UPDATE( + vc->runner->stat.generic.halt_wait_hist, + ktime_to_ns(cur) - ktime_to_ns(start_wait)); + /* Attribute failed poll time */ + if (vc->halt_poll_ns) { + vc->runner->stat.generic.halt_poll_fail_ns += + ktime_to_ns(start_wait) - + ktime_to_ns(start_poll); + KVM_STATS_LOG_HIST_UPDATE( + vc->runner->stat.generic.halt_poll_fail_hist, + ktime_to_ns(start_wait) - + ktime_to_ns(start_poll)); + } + } else { + /* Attribute successful poll time */ + if (vc->halt_poll_ns) { + vc->runner->stat.generic.halt_poll_success_ns += + ktime_to_ns(cur) - + ktime_to_ns(start_poll); + KVM_STATS_LOG_HIST_UPDATE( + vc->runner->stat.generic.halt_poll_success_hist, + ktime_to_ns(cur) - ktime_to_ns(start_poll)); + } + } + + /* Adjust poll time */ + if (halt_poll_ns) { + if (block_ns <= vc->halt_poll_ns) + ; + /* We slept and blocked for longer than the max halt time */ + else if (vc->halt_poll_ns && block_ns > halt_poll_ns) + shrink_halt_poll_ns(vc); + /* We slept and our poll time is too small */ + else if (vc->halt_poll_ns < halt_poll_ns && + block_ns < halt_poll_ns) + grow_halt_poll_ns(vc); + if (vc->halt_poll_ns > halt_poll_ns) + vc->halt_poll_ns = halt_poll_ns; + } else + vc->halt_poll_ns = 0; + + trace_kvmppc_vcore_wakeup(do_sleep, block_ns); +} + +/* + * This never fails for a radix guest, as none of the operations it does + * for a radix guest can fail or have a way to report failure. + */ +static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu) +{ + int r = 0; + struct kvm *kvm = vcpu->kvm; + + mutex_lock(&kvm->arch.mmu_setup_lock); + if (!kvm->arch.mmu_ready) { + if (!kvm_is_radix(kvm)) + r = kvmppc_hv_setup_htab_rma(vcpu); + if (!r) { + if (cpu_has_feature(CPU_FTR_ARCH_300)) + kvmppc_setup_partition_table(kvm); + kvm->arch.mmu_ready = 1; + } + } + mutex_unlock(&kvm->arch.mmu_setup_lock); + return r; +} + +static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + int n_ceded, i, r; + struct kvmppc_vcore *vc; + struct kvm_vcpu *v; + + trace_kvmppc_run_vcpu_enter(vcpu); + + run->exit_reason = 0; + vcpu->arch.ret = RESUME_GUEST; + vcpu->arch.trap = 0; + kvmppc_update_vpas(vcpu); + + /* + * Synchronize with other threads in this virtual core + */ + vc = vcpu->arch.vcore; + spin_lock(&vc->lock); + vcpu->arch.ceded = 0; + vcpu->arch.run_task = current; + vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); + vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; + vcpu->arch.busy_preempt = TB_NIL; + WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); + ++vc->n_runnable; + + /* + * This happens the first time this is called for a vcpu. + * If the vcore is already running, we may be able to start + * this thread straight away and have it join in. + */ + if (!signal_pending(current)) { + if ((vc->vcore_state == VCORE_PIGGYBACK || + vc->vcore_state == VCORE_RUNNING) && + !VCORE_IS_EXITING(vc)) { + kvmppc_update_vpa_dispatch(vcpu, vc); + kvmppc_start_thread(vcpu, vc); + trace_kvm_guest_enter(vcpu); + } else if (vc->vcore_state == VCORE_SLEEPING) { + rcuwait_wake_up(&vc->wait); + } + + } + + while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && + !signal_pending(current)) { + /* See if the MMU is ready to go */ + if (!vcpu->kvm->arch.mmu_ready) { + spin_unlock(&vc->lock); + r = kvmhv_setup_mmu(vcpu); + spin_lock(&vc->lock); + if (r) { + run->exit_reason = KVM_EXIT_FAIL_ENTRY; + run->fail_entry. + hardware_entry_failure_reason = 0; + vcpu->arch.ret = r; + break; + } + } + + if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) + kvmppc_vcore_end_preempt(vc); + + if (vc->vcore_state != VCORE_INACTIVE) { + kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); + continue; + } + for_each_runnable_thread(i, v, vc) { + kvmppc_core_prepare_to_enter(v); + if (signal_pending(v->arch.run_task)) { + kvmppc_remove_runnable(vc, v, mftb()); + v->stat.signal_exits++; + v->run->exit_reason = KVM_EXIT_INTR; + v->arch.ret = -EINTR; + wake_up(&v->arch.cpu_run); + } + } + if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) + break; + n_ceded = 0; + for_each_runnable_thread(i, v, vc) { + if (!kvmppc_vcpu_woken(v)) + n_ceded += v->arch.ceded; + else + v->arch.ceded = 0; + } + vc->runner = vcpu; + if (n_ceded == vc->n_runnable) { + kvmppc_vcore_blocked(vc); + } else if (need_resched()) { + kvmppc_vcore_preempt(vc); + /* Let something else run */ + cond_resched_lock(&vc->lock); + if (vc->vcore_state == VCORE_PREEMPT) + kvmppc_vcore_end_preempt(vc); + } else { + kvmppc_run_core(vc); + } + vc->runner = NULL; + } + + while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && + (vc->vcore_state == VCORE_RUNNING || + vc->vcore_state == VCORE_EXITING || + vc->vcore_state == VCORE_PIGGYBACK)) + kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); + + if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) + kvmppc_vcore_end_preempt(vc); + + if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { + kvmppc_remove_runnable(vc, vcpu, mftb()); + vcpu->stat.signal_exits++; + run->exit_reason = KVM_EXIT_INTR; + vcpu->arch.ret = -EINTR; + } + + if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { + /* Wake up some vcpu to run the core */ + i = -1; + v = next_runnable_thread(vc, &i); + wake_up(&v->arch.cpu_run); + } + + trace_kvmppc_run_vcpu_exit(vcpu); + spin_unlock(&vc->lock); + return vcpu->arch.ret; +} + +int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, + unsigned long lpcr) +{ + struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); + struct kvm_run *run = vcpu->run; + int trap, r, pcpu; + int srcu_idx; + struct kvmppc_vcore *vc; + struct kvm *kvm = vcpu->kvm; + struct kvm_nested_guest *nested = vcpu->arch.nested; + unsigned long flags; + u64 tb; + + trace_kvmppc_run_vcpu_enter(vcpu); + + run->exit_reason = 0; + vcpu->arch.ret = RESUME_GUEST; + vcpu->arch.trap = 0; + + vc = vcpu->arch.vcore; + vcpu->arch.ceded = 0; + vcpu->arch.run_task = current; + vcpu->arch.last_inst = KVM_INST_FETCH_FAILED; + + /* See if the MMU is ready to go */ + if (unlikely(!kvm->arch.mmu_ready)) { + r = kvmhv_setup_mmu(vcpu); + if (r) { + run->exit_reason = KVM_EXIT_FAIL_ENTRY; + run->fail_entry.hardware_entry_failure_reason = 0; + vcpu->arch.ret = r; + return r; + } + } + + if (need_resched()) + cond_resched(); + + kvmppc_update_vpas(vcpu); + + preempt_disable(); + pcpu = smp_processor_id(); + if (kvm_is_radix(kvm)) + kvmppc_prepare_radix_vcpu(vcpu, pcpu); + + /* flags save not required, but irq_pmu has no disable/enable API */ + powerpc_local_irq_pmu_save(flags); + + vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; + + if (signal_pending(current)) + goto sigpend; + if (need_resched() || !kvm->arch.mmu_ready) + goto out; + + vcpu->cpu = pcpu; + vcpu->arch.thread_cpu = pcpu; + vc->pcpu = pcpu; + local_paca->kvm_hstate.kvm_vcpu = vcpu; + local_paca->kvm_hstate.ptid = 0; + local_paca->kvm_hstate.fake_suspend = 0; + + /* + * Orders set cpu/thread_cpu vs testing for pending interrupts and + * doorbells below. The other side is when these fields are set vs + * kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to + * kick a vCPU to notice the pending interrupt. + */ + smp_mb(); + + if (!nested) { + kvmppc_core_prepare_to_enter(vcpu); + if (vcpu->arch.shregs.msr & MSR_EE) { + if (xive_interrupt_pending(vcpu)) + kvmppc_inject_interrupt_hv(vcpu, + BOOK3S_INTERRUPT_EXTERNAL, 0); + } else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, + &vcpu->arch.pending_exceptions)) { + lpcr |= LPCR_MER; + } + } else if (vcpu->arch.pending_exceptions || + vcpu->arch.doorbell_request || + xive_interrupt_pending(vcpu)) { + vcpu->arch.ret = RESUME_HOST; + goto out; + } + + if (vcpu->arch.timer_running) { + hrtimer_try_to_cancel(&vcpu->arch.dec_timer); + vcpu->arch.timer_running = 0; + } + + tb = mftb(); + + kvmppc_update_vpa_dispatch_p9(vcpu, vc, tb + vc->tb_offset); + + trace_kvm_guest_enter(vcpu); + + guest_timing_enter_irqoff(); + + srcu_idx = srcu_read_lock(&kvm->srcu); + + guest_state_enter_irqoff(); + this_cpu_disable_ftrace(); + + trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb); + vcpu->arch.trap = trap; + + this_cpu_enable_ftrace(); + guest_state_exit_irqoff(); + + srcu_read_unlock(&kvm->srcu, srcu_idx); + + set_irq_happened(trap); + + vcpu->cpu = -1; + vcpu->arch.thread_cpu = -1; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + + if (!vtime_accounting_enabled_this_cpu()) { + powerpc_local_irq_pmu_restore(flags); + /* + * Service IRQs here before guest_timing_exit_irqoff() so any + * ticks that occurred while running the guest are accounted to + * the guest. If vtime accounting is enabled, accounting uses + * TB rather than ticks, so it can be done without enabling + * interrupts here, which has the problem that it accounts + * interrupt processing overhead to the host. + */ + powerpc_local_irq_pmu_save(flags); + } + guest_timing_exit_irqoff(); + + powerpc_local_irq_pmu_restore(flags); + + preempt_enable(); + + /* + * cancel pending decrementer exception if DEC is now positive, or if + * entering a nested guest in which case the decrementer is now owned + * by L2 and the L1 decrementer is provided in hdec_expires + */ + if (kvmppc_core_pending_dec(vcpu) && + ((tb < kvmppc_dec_expires_host_tb(vcpu)) || + (trap == BOOK3S_INTERRUPT_SYSCALL && + kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) + kvmppc_core_dequeue_dec(vcpu); + + trace_kvm_guest_exit(vcpu); + r = RESUME_GUEST; + if (trap) { + if (!nested) + r = kvmppc_handle_exit_hv(vcpu, current); + else + r = kvmppc_handle_nested_exit(vcpu); + } + vcpu->arch.ret = r; + + if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { + kvmppc_set_timer(vcpu); + + prepare_to_rcuwait(wait); + for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + if (signal_pending(current)) { + vcpu->stat.signal_exits++; + run->exit_reason = KVM_EXIT_INTR; + vcpu->arch.ret = -EINTR; + break; + } + + if (kvmppc_vcpu_check_block(vcpu)) + break; + + trace_kvmppc_vcore_blocked(vcpu, 0); + schedule(); + trace_kvmppc_vcore_blocked(vcpu, 1); + } + finish_rcuwait(wait); + } + vcpu->arch.ceded = 0; + + done: + trace_kvmppc_run_vcpu_exit(vcpu); + + return vcpu->arch.ret; + + sigpend: + vcpu->stat.signal_exits++; + run->exit_reason = KVM_EXIT_INTR; + vcpu->arch.ret = -EINTR; + out: + vcpu->cpu = -1; + vcpu->arch.thread_cpu = -1; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + powerpc_local_irq_pmu_restore(flags); + preempt_enable(); + goto done; +} + +static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + int r; + int srcu_idx; + struct kvm *kvm; + unsigned long msr; + + start_timing(vcpu, &vcpu->arch.vcpu_entry); + + if (!vcpu->arch.sane) { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return -EINVAL; + } + + /* No need to go into the guest when all we'll do is come back out */ + if (signal_pending(current)) { + run->exit_reason = KVM_EXIT_INTR; + return -EINTR; + } + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + /* + * Don't allow entry with a suspended transaction, because + * the guest entry/exit code will lose it. + */ + if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs && + (current->thread.regs->msr & MSR_TM)) { + if (MSR_TM_ACTIVE(current->thread.regs->msr)) { + run->exit_reason = KVM_EXIT_FAIL_ENTRY; + run->fail_entry.hardware_entry_failure_reason = 0; + return -EINVAL; + } + } +#endif + + /* + * Force online to 1 for the sake of old userspace which doesn't + * set it. + */ + if (!vcpu->arch.online) { + atomic_inc(&vcpu->arch.vcore->online_count); + vcpu->arch.online = 1; + } + + kvmppc_core_prepare_to_enter(vcpu); + + kvm = vcpu->kvm; + atomic_inc(&kvm->arch.vcpus_running); + /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */ + smp_mb(); + + msr = 0; + if (IS_ENABLED(CONFIG_PPC_FPU)) + msr |= MSR_FP; + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + msr |= MSR_VEC; + if (cpu_has_feature(CPU_FTR_VSX)) + msr |= MSR_VSX; + if ((cpu_has_feature(CPU_FTR_TM) || + cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) && + (vcpu->arch.hfscr & HFSCR_TM)) + msr |= MSR_TM; + msr = msr_check_and_set(msr); + + kvmppc_save_user_regs(); + + kvmppc_save_current_sprs(); + + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + vcpu->arch.waitp = &vcpu->arch.vcore->wait; + vcpu->arch.pgdir = kvm->mm->pgd; + vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; + + do { + accumulate_time(vcpu, &vcpu->arch.guest_entry); + if (cpu_has_feature(CPU_FTR_ARCH_300)) + r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, + vcpu->arch.vcore->lpcr); + else + r = kvmppc_run_vcpu(vcpu); + + if (run->exit_reason == KVM_EXIT_PAPR_HCALL) { + accumulate_time(vcpu, &vcpu->arch.hcall); + + if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_PR)) { + /* + * These should have been caught reflected + * into the guest by now. Final sanity check: + * don't allow userspace to execute hcalls in + * the hypervisor. + */ + r = RESUME_GUEST; + continue; + } + trace_kvm_hcall_enter(vcpu); + r = kvmppc_pseries_do_hcall(vcpu); + trace_kvm_hcall_exit(vcpu, r); + kvmppc_core_prepare_to_enter(vcpu); + } else if (r == RESUME_PAGE_FAULT) { + accumulate_time(vcpu, &vcpu->arch.pg_fault); + srcu_idx = srcu_read_lock(&kvm->srcu); + r = kvmppc_book3s_hv_page_fault(vcpu, + vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); + srcu_read_unlock(&kvm->srcu, srcu_idx); + } else if (r == RESUME_PASSTHROUGH) { + if (WARN_ON(xics_on_xive())) + r = H_SUCCESS; + else + r = kvmppc_xics_rm_complete(vcpu, 0); + } + } while (is_kvmppc_resume_guest(r)); + accumulate_time(vcpu, &vcpu->arch.vcpu_exit); + + vcpu->arch.state = KVMPPC_VCPU_NOTREADY; + atomic_dec(&kvm->arch.vcpus_running); + + srr_regs_clobbered(); + + end_timing(vcpu); + + return r; +} + +static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, + int shift, int sllp) +{ + (*sps)->page_shift = shift; + (*sps)->slb_enc = sllp; + (*sps)->enc[0].page_shift = shift; + (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift); + /* + * Add 16MB MPSS support (may get filtered out by userspace) + */ + if (shift != 24) { + int penc = kvmppc_pgsize_lp_encoding(shift, 24); + if (penc != -1) { + (*sps)->enc[1].page_shift = 24; + (*sps)->enc[1].pte_enc = penc; + } + } + (*sps)++; +} + +static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, + struct kvm_ppc_smmu_info *info) +{ + struct kvm_ppc_one_seg_page_size *sps; + + /* + * POWER7, POWER8 and POWER9 all support 32 storage keys for data. + * POWER7 doesn't support keys for instruction accesses, + * POWER8 and POWER9 do. + */ + info->data_keys = 32; + info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0; + + /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */ + info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS; + info->slb_size = 32; + + /* We only support these sizes for now, and no muti-size segments */ + sps = &info->sps[0]; + kvmppc_add_seg_page_size(&sps, 12, 0); + kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01); + kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L); + + /* If running as a nested hypervisor, we don't support HPT guests */ + if (kvmhv_on_pseries()) + info->flags |= KVM_PPC_NO_HASH; + + return 0; +} + +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, + struct kvm_dirty_log *log) +{ + struct kvm_memslots *slots; + struct kvm_memory_slot *memslot; + int r; + unsigned long n, i; + unsigned long *buf, *p; + struct kvm_vcpu *vcpu; + + mutex_lock(&kvm->slots_lock); + + r = -EINVAL; + if (log->slot >= KVM_USER_MEM_SLOTS) + goto out; + + slots = kvm_memslots(kvm); + memslot = id_to_memslot(slots, log->slot); + r = -ENOENT; + if (!memslot || !memslot->dirty_bitmap) + goto out; + + /* + * Use second half of bitmap area because both HPT and radix + * accumulate bits in the first half. + */ + n = kvm_dirty_bitmap_bytes(memslot); + buf = memslot->dirty_bitmap + n / sizeof(long); + memset(buf, 0, n); + + if (kvm_is_radix(kvm)) + r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf); + else + r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf); + if (r) + goto out; + + /* + * We accumulate dirty bits in the first half of the + * memslot's dirty_bitmap area, for when pages are paged + * out or modified by the host directly. Pick up these + * bits and add them to the map. + */ + p = memslot->dirty_bitmap; + for (i = 0; i < n / sizeof(long); ++i) + buf[i] |= xchg(&p[i], 0); + + /* Harvest dirty bits from VPA and DTL updates */ + /* Note: we never modify the SLB shadow buffer areas */ + kvm_for_each_vcpu(i, vcpu, kvm) { + spin_lock(&vcpu->arch.vpa_update_lock); + kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf); + kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf); + spin_unlock(&vcpu->arch.vpa_update_lock); + } + + r = -EFAULT; + if (copy_to_user(log->dirty_bitmap, buf, n)) + goto out; + + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; +} + +static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) +{ + vfree(slot->arch.rmap); + slot->arch.rmap = NULL; +} + +static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, + const struct kvm_memory_slot *old, + struct kvm_memory_slot *new, + enum kvm_mr_change change) +{ + if (change == KVM_MR_CREATE) { + unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap)); + + if ((size >> PAGE_SHIFT) > totalram_pages()) + return -ENOMEM; + + new->arch.rmap = vzalloc(size); + if (!new->arch.rmap) + return -ENOMEM; + } else if (change != KVM_MR_DELETE) { + new->arch.rmap = old->arch.rmap; + } + + return 0; +} + +static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) +{ + /* + * If we are creating or modifying a memslot, it might make + * some address that was previously cached as emulated + * MMIO be no longer emulated MMIO, so invalidate + * all the caches of emulated MMIO translations. + */ + if (change != KVM_MR_DELETE) + atomic64_inc(&kvm->arch.mmio_update); + + /* + * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels + * have already called kvm_arch_flush_shadow_memslot() to + * flush shadow mappings. For KVM_MR_CREATE we have no + * previous mappings. So the only case to handle is + * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit + * has been changed. + * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES + * to get rid of any THP PTEs in the partition-scoped page tables + * so we can track dirtiness at the page level; we flush when + * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to + * using THP PTEs. + */ + if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) && + ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES)) + kvmppc_radix_flush_memslot(kvm, old); + /* + * If UV hasn't yet called H_SVM_INIT_START, don't register memslots. + */ + if (!kvm->arch.secure_guest) + return; + + switch (change) { + case KVM_MR_CREATE: + /* + * @TODO kvmppc_uvmem_memslot_create() can fail and + * return error. Fix this. + */ + kvmppc_uvmem_memslot_create(kvm, new); + break; + case KVM_MR_DELETE: + kvmppc_uvmem_memslot_delete(kvm, old); + break; + default: + /* TODO: Handle KVM_MR_MOVE */ + break; + } +} + +/* + * Update LPCR values in kvm->arch and in vcores. + * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion + * of kvm->arch.lpcr update). + */ +void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) +{ + long int i; + u32 cores_done = 0; + + if ((kvm->arch.lpcr & mask) == lpcr) + return; + + kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; + + for (i = 0; i < KVM_MAX_VCORES; ++i) { + struct kvmppc_vcore *vc = kvm->arch.vcores[i]; + if (!vc) + continue; + + spin_lock(&vc->lock); + vc->lpcr = (vc->lpcr & ~mask) | lpcr; + verify_lpcr(kvm, vc->lpcr); + spin_unlock(&vc->lock); + if (++cores_done >= kvm->arch.online_vcores) + break; + } +} + +void kvmppc_setup_partition_table(struct kvm *kvm) +{ + unsigned long dw0, dw1; + + if (!kvm_is_radix(kvm)) { + /* PS field - page size for VRMA */ + dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) | + ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1); + /* HTABSIZE and HTABORG fields */ + dw0 |= kvm->arch.sdr1; + + /* Second dword as set by userspace */ + dw1 = kvm->arch.process_table; + } else { + dw0 = PATB_HR | radix__get_tree_size() | + __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE; + dw1 = PATB_GR | kvm->arch.process_table; + } + kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1); +} + +/* + * Set up HPT (hashed page table) and RMA (real-mode area). + * Must be called with kvm->arch.mmu_setup_lock held. + */ +static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) +{ + int err = 0; + struct kvm *kvm = vcpu->kvm; + unsigned long hva; + struct kvm_memory_slot *memslot; + struct vm_area_struct *vma; + unsigned long lpcr = 0, senc; + unsigned long psize, porder; + int srcu_idx; + + /* Allocate hashed page table (if not done already) and reset it */ + if (!kvm->arch.hpt.virt) { + int order = KVM_DEFAULT_HPT_ORDER; + struct kvm_hpt_info info; + + err = kvmppc_allocate_hpt(&info, order); + /* If we get here, it means userspace didn't specify a + * size explicitly. So, try successively smaller + * sizes if the default failed. */ + while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER) + err = kvmppc_allocate_hpt(&info, order); + + if (err < 0) { + pr_err("KVM: Couldn't alloc HPT\n"); + goto out; + } + + kvmppc_set_hpt(kvm, &info); + } + + /* Look up the memslot for guest physical address 0 */ + srcu_idx = srcu_read_lock(&kvm->srcu); + memslot = gfn_to_memslot(kvm, 0); + + /* We must have some memory at 0 by now */ + err = -EINVAL; + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) + goto out_srcu; + + /* Look up the VMA for the start of this memory slot */ + hva = memslot->userspace_addr; + mmap_read_lock(kvm->mm); + vma = vma_lookup(kvm->mm, hva); + if (!vma || (vma->vm_flags & VM_IO)) + goto up_out; + + psize = vma_kernel_pagesize(vma); + + mmap_read_unlock(kvm->mm); + + /* We can handle 4k, 64k or 16M pages in the VRMA */ + if (psize >= 0x1000000) + psize = 0x1000000; + else if (psize >= 0x10000) + psize = 0x10000; + else + psize = 0x1000; + porder = __ilog2(psize); + + senc = slb_pgsize_encoding(psize); + kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); + /* Create HPTEs in the hash page table for the VRMA */ + kvmppc_map_vrma(vcpu, memslot, porder); + + /* Update VRMASD field in the LPCR */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) { + /* the -4 is to account for senc values starting at 0x10 */ + lpcr = senc << (LPCR_VRMASD_SH - 4); + kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); + } + + /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */ + smp_wmb(); + err = 0; + out_srcu: + srcu_read_unlock(&kvm->srcu, srcu_idx); + out: + return err; + + up_out: + mmap_read_unlock(kvm->mm); + goto out_srcu; +} + +/* + * Must be called with kvm->arch.mmu_setup_lock held and + * mmu_ready = 0 and no vcpus running. + */ +int kvmppc_switch_mmu_to_hpt(struct kvm *kvm) +{ + unsigned long lpcr, lpcr_mask; + + if (nesting_enabled(kvm)) + kvmhv_release_all_nested(kvm); + kvmppc_rmap_reset(kvm); + kvm->arch.process_table = 0; + /* Mutual exclusion with kvm_unmap_gfn_range etc. */ + spin_lock(&kvm->mmu_lock); + kvm->arch.radix = 0; + spin_unlock(&kvm->mmu_lock); + kvmppc_free_radix(kvm); + + lpcr = LPCR_VPM1; + lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; + if (cpu_has_feature(CPU_FTR_ARCH_31)) + lpcr_mask |= LPCR_HAIL; + kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); + + return 0; +} + +/* + * Must be called with kvm->arch.mmu_setup_lock held and + * mmu_ready = 0 and no vcpus running. + */ +int kvmppc_switch_mmu_to_radix(struct kvm *kvm) +{ + unsigned long lpcr, lpcr_mask; + int err; + + err = kvmppc_init_vm_radix(kvm); + if (err) + return err; + kvmppc_rmap_reset(kvm); + /* Mutual exclusion with kvm_unmap_gfn_range etc. */ + spin_lock(&kvm->mmu_lock); + kvm->arch.radix = 1; + spin_unlock(&kvm->mmu_lock); + kvmppc_free_hpt(&kvm->arch.hpt); + + lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR; + lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; + if (cpu_has_feature(CPU_FTR_ARCH_31)) { + lpcr_mask |= LPCR_HAIL; + if (cpu_has_feature(CPU_FTR_HVMODE) && + (kvm->arch.host_lpcr & LPCR_HAIL)) + lpcr |= LPCR_HAIL; + } + kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); + + return 0; +} + +#ifdef CONFIG_KVM_XICS +/* + * Allocate a per-core structure for managing state about which cores are + * running in the host versus the guest and for exchanging data between + * real mode KVM and CPU running in the host. + * This is only done for the first VM. + * The allocated structure stays even if all VMs have stopped. + * It is only freed when the kvm-hv module is unloaded. + * It's OK for this routine to fail, we just don't support host + * core operations like redirecting H_IPI wakeups. + */ +void kvmppc_alloc_host_rm_ops(void) +{ + struct kvmppc_host_rm_ops *ops; + unsigned long l_ops; + int cpu, core; + int size; + + if (cpu_has_feature(CPU_FTR_ARCH_300)) + return; + + /* Not the first time here ? */ + if (kvmppc_host_rm_ops_hv != NULL) + return; + + ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); + if (!ops) + return; + + size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); + ops->rm_core = kzalloc(size, GFP_KERNEL); + + if (!ops->rm_core) { + kfree(ops); + return; + } + + cpus_read_lock(); + + for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { + if (!cpu_online(cpu)) + continue; + + core = cpu >> threads_shift; + ops->rm_core[core].rm_state.in_host = 1; + } + + ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; + + /* + * Make the contents of the kvmppc_host_rm_ops structure visible + * to other CPUs before we assign it to the global variable. + * Do an atomic assignment (no locks used here), but if someone + * beats us to it, just free our copy and return. + */ + smp_wmb(); + l_ops = (unsigned long) ops; + + if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { + cpus_read_unlock(); + kfree(ops->rm_core); + kfree(ops); + return; + } + + cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE, + "ppc/kvm_book3s:prepare", + kvmppc_set_host_core, + kvmppc_clear_host_core); + cpus_read_unlock(); +} + +void kvmppc_free_host_rm_ops(void) +{ + if (kvmppc_host_rm_ops_hv) { + cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE); + kfree(kvmppc_host_rm_ops_hv->rm_core); + kfree(kvmppc_host_rm_ops_hv); + kvmppc_host_rm_ops_hv = NULL; + } +} +#endif + +static int kvmppc_core_init_vm_hv(struct kvm *kvm) +{ + unsigned long lpcr, lpid; + int ret; + + mutex_init(&kvm->arch.uvmem_lock); + INIT_LIST_HEAD(&kvm->arch.uvmem_pfns); + mutex_init(&kvm->arch.mmu_setup_lock); + + /* Allocate the guest's logical partition ID */ + + lpid = kvmppc_alloc_lpid(); + if ((long)lpid < 0) + return -ENOMEM; + kvm->arch.lpid = lpid; + + kvmppc_alloc_host_rm_ops(); + + kvmhv_vm_nested_init(kvm); + + /* + * Since we don't flush the TLB when tearing down a VM, + * and this lpid might have previously been used, + * make sure we flush on each core before running the new VM. + * On POWER9, the tlbie in mmu_partition_table_set_entry() + * does this flush for us. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + cpumask_setall(&kvm->arch.need_tlb_flush); + + /* Start out with the default set of hcalls enabled */ + memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, + sizeof(kvm->arch.enabled_hcalls)); + + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); + + /* Init LPCR for virtual RMA mode */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + kvm->arch.host_lpid = mfspr(SPRN_LPID); + kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); + lpcr &= LPCR_PECE | LPCR_LPES; + } else { + /* + * The L2 LPES mode will be set by the L0 according to whether + * or not it needs to take external interrupts in HV mode. + */ + lpcr = 0; + } + lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | + LPCR_VPM0 | LPCR_VPM1; + kvm->arch.vrma_slb_v = SLB_VSID_B_1T | + (VRMA_VSID << SLB_VSID_SHIFT_1T); + /* On POWER8 turn on online bit to enable PURR/SPURR */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + lpcr |= LPCR_ONL; + /* + * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed) + * Set HVICE bit to enable hypervisor virtualization interrupts. + * Set HEIC to prevent OS interrupts to go to hypervisor (should + * be unnecessary but better safe than sorry in case we re-enable + * EE in HV mode with this LPCR still set) + */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + lpcr &= ~LPCR_VPM0; + lpcr |= LPCR_HVICE | LPCR_HEIC; + + /* + * If xive is enabled, we route 0x500 interrupts directly + * to the guest. + */ + if (xics_on_xive()) + lpcr |= LPCR_LPES; + } + + /* + * If the host uses radix, the guest starts out as radix. + */ + if (radix_enabled()) { + kvm->arch.radix = 1; + kvm->arch.mmu_ready = 1; + lpcr &= ~LPCR_VPM1; + lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; + if (cpu_has_feature(CPU_FTR_HVMODE) && + cpu_has_feature(CPU_FTR_ARCH_31) && + (kvm->arch.host_lpcr & LPCR_HAIL)) + lpcr |= LPCR_HAIL; + ret = kvmppc_init_vm_radix(kvm); + if (ret) { + kvmppc_free_lpid(kvm->arch.lpid); + return ret; + } + kvmppc_setup_partition_table(kvm); + } + + verify_lpcr(kvm, lpcr); + kvm->arch.lpcr = lpcr; + + /* Initialization for future HPT resizes */ + kvm->arch.resize_hpt = NULL; + + /* + * Work out how many sets the TLB has, for the use of + * the TLB invalidation loop in book3s_hv_rmhandlers.S. + */ + if (cpu_has_feature(CPU_FTR_ARCH_31)) { + /* + * P10 will flush all the congruence class with a single tlbiel + */ + kvm->arch.tlb_sets = 1; + } else if (radix_enabled()) + kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */ + else if (cpu_has_feature(CPU_FTR_ARCH_300)) + kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */ + else if (cpu_has_feature(CPU_FTR_ARCH_207S)) + kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */ + else + kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */ + + /* + * Track that we now have a HV mode VM active. This blocks secondary + * CPU threads from coming online. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + kvm_hv_vm_activated(); + + /* + * Initialize smt_mode depending on processor. + * POWER8 and earlier have to use "strict" threading, where + * all vCPUs in a vcore have to run on the same (sub)core, + * whereas on POWER9 the threads can each run a different + * guest. + */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + kvm->arch.smt_mode = threads_per_subcore; + else + kvm->arch.smt_mode = 1; + kvm->arch.emul_smt_mode = 1; + + return 0; +} + +static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm) +{ + kvmppc_mmu_debugfs_init(kvm); + if (radix_enabled()) + kvmhv_radix_debugfs_init(kvm); + return 0; +} + +static void kvmppc_free_vcores(struct kvm *kvm) +{ + long int i; + + for (i = 0; i < KVM_MAX_VCORES; ++i) + kfree(kvm->arch.vcores[i]); + kvm->arch.online_vcores = 0; +} + +static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + kvm_hv_vm_deactivated(); + + kvmppc_free_vcores(kvm); + + + if (kvm_is_radix(kvm)) + kvmppc_free_radix(kvm); + else + kvmppc_free_hpt(&kvm->arch.hpt); + + /* Perform global invalidation and return lpid to the pool */ + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + if (nesting_enabled(kvm)) + kvmhv_release_all_nested(kvm); + kvm->arch.process_table = 0; + if (kvm->arch.secure_guest) + uv_svm_terminate(kvm->arch.lpid); + kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0); + } + + kvmppc_free_lpid(kvm->arch.lpid); + + kvmppc_free_pimap(kvm); +} + +/* We don't need to emulate any privileged instructions or dcbz */ +static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu, + unsigned int inst, int *advance) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, + ulong spr_val) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, + ulong *spr_val) +{ + return EMULATE_FAIL; +} + +static int kvmppc_core_check_processor_compat_hv(void) +{ + if (cpu_has_feature(CPU_FTR_HVMODE) && + cpu_has_feature(CPU_FTR_ARCH_206)) + return 0; + + /* POWER9 in radix mode is capable of being a nested hypervisor. */ + if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) + return 0; + + return -EIO; +} + +#ifdef CONFIG_KVM_XICS + +void kvmppc_free_pimap(struct kvm *kvm) +{ + kfree(kvm->arch.pimap); +} + +static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) +{ + return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); +} + +static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) +{ + struct irq_desc *desc; + struct kvmppc_irq_map *irq_map; + struct kvmppc_passthru_irqmap *pimap; + struct irq_chip *chip; + int i, rc = 0; + struct irq_data *host_data; + + if (!kvm_irq_bypass) + return 1; + + desc = irq_to_desc(host_irq); + if (!desc) + return -EIO; + + mutex_lock(&kvm->lock); + + pimap = kvm->arch.pimap; + if (pimap == NULL) { + /* First call, allocate structure to hold IRQ map */ + pimap = kvmppc_alloc_pimap(); + if (pimap == NULL) { + mutex_unlock(&kvm->lock); + return -ENOMEM; + } + kvm->arch.pimap = pimap; + } + + /* + * For now, we only support interrupts for which the EOI operation + * is an OPAL call followed by a write to XIRR, since that's + * what our real-mode EOI code does, or a XIVE interrupt + */ + chip = irq_data_get_irq_chip(&desc->irq_data); + if (!chip || !is_pnv_opal_msi(chip)) { + pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", + host_irq, guest_gsi); + mutex_unlock(&kvm->lock); + return -ENOENT; + } + + /* + * See if we already have an entry for this guest IRQ number. + * If it's mapped to a hardware IRQ number, that's an error, + * otherwise re-use this entry. + */ + for (i = 0; i < pimap->n_mapped; i++) { + if (guest_gsi == pimap->mapped[i].v_hwirq) { + if (pimap->mapped[i].r_hwirq) { + mutex_unlock(&kvm->lock); + return -EINVAL; + } + break; + } + } + + if (i == KVMPPC_PIRQ_MAPPED) { + mutex_unlock(&kvm->lock); + return -EAGAIN; /* table is full */ + } + + irq_map = &pimap->mapped[i]; + + irq_map->v_hwirq = guest_gsi; + irq_map->desc = desc; + + /* + * Order the above two stores before the next to serialize with + * the KVM real mode handler. + */ + smp_wmb(); + + /* + * The 'host_irq' number is mapped in the PCI-MSI domain but + * the underlying calls, which will EOI the interrupt in real + * mode, need an HW IRQ number mapped in the XICS IRQ domain. + */ + host_data = irq_domain_get_irq_data(irq_get_default_host(), host_irq); + irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data); + + if (i == pimap->n_mapped) + pimap->n_mapped++; + + if (xics_on_xive()) + rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq); + else + kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq); + if (rc) + irq_map->r_hwirq = 0; + + mutex_unlock(&kvm->lock); + + return 0; +} + +static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) +{ + struct irq_desc *desc; + struct kvmppc_passthru_irqmap *pimap; + int i, rc = 0; + + if (!kvm_irq_bypass) + return 0; + + desc = irq_to_desc(host_irq); + if (!desc) + return -EIO; + + mutex_lock(&kvm->lock); + if (!kvm->arch.pimap) + goto unlock; + + pimap = kvm->arch.pimap; + + for (i = 0; i < pimap->n_mapped; i++) { + if (guest_gsi == pimap->mapped[i].v_hwirq) + break; + } + + if (i == pimap->n_mapped) { + mutex_unlock(&kvm->lock); + return -ENODEV; + } + + if (xics_on_xive()) + rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq); + else + kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); + + /* invalidate the entry (what to do on error from the above ?) */ + pimap->mapped[i].r_hwirq = 0; + + /* + * We don't free this structure even when the count goes to + * zero. The structure is freed when we destroy the VM. + */ + unlock: + mutex_unlock(&kvm->lock); + return rc; +} + +static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, + struct irq_bypass_producer *prod) +{ + int ret = 0; + struct kvm_kernel_irqfd *irqfd = + container_of(cons, struct kvm_kernel_irqfd, consumer); + + irqfd->producer = prod; + + ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); + if (ret) + pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", + prod->irq, irqfd->gsi, ret); + + return ret; +} + +static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, + struct irq_bypass_producer *prod) +{ + int ret; + struct kvm_kernel_irqfd *irqfd = + container_of(cons, struct kvm_kernel_irqfd, consumer); + + irqfd->producer = NULL; + + /* + * When producer of consumer is unregistered, we change back to + * default external interrupt handling mode - KVM real mode + * will switch back to host. + */ + ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); + if (ret) + pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", + prod->irq, irqfd->gsi, ret); +} +#endif + +static long kvm_arch_vm_ioctl_hv(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm *kvm __maybe_unused = filp->private_data; + void __user *argp = (void __user *)arg; + long r; + + switch (ioctl) { + + case KVM_PPC_ALLOCATE_HTAB: { + u32 htab_order; + + /* If we're a nested hypervisor, we currently only support radix */ + if (kvmhv_on_pseries()) { + r = -EOPNOTSUPP; + break; + } + + r = -EFAULT; + if (get_user(htab_order, (u32 __user *)argp)) + break; + r = kvmppc_alloc_reset_hpt(kvm, htab_order); + if (r) + break; + r = 0; + break; + } + + case KVM_PPC_GET_HTAB_FD: { + struct kvm_get_htab_fd ghf; + + r = -EFAULT; + if (copy_from_user(&ghf, argp, sizeof(ghf))) + break; + r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); + break; + } + + case KVM_PPC_RESIZE_HPT_PREPARE: { + struct kvm_ppc_resize_hpt rhpt; + + r = -EFAULT; + if (copy_from_user(&rhpt, argp, sizeof(rhpt))) + break; + + r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt); + break; + } + + case KVM_PPC_RESIZE_HPT_COMMIT: { + struct kvm_ppc_resize_hpt rhpt; + + r = -EFAULT; + if (copy_from_user(&rhpt, argp, sizeof(rhpt))) + break; + + r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt); + break; + } + + default: + r = -ENOTTY; + } + + return r; +} + +/* + * List of hcall numbers to enable by default. + * For compatibility with old userspace, we enable by default + * all hcalls that were implemented before the hcall-enabling + * facility was added. Note this list should not include H_RTAS. + */ +static unsigned int default_hcall_list[] = { + H_REMOVE, + H_ENTER, + H_READ, + H_PROTECT, + H_BULK_REMOVE, +#ifdef CONFIG_SPAPR_TCE_IOMMU + H_GET_TCE, + H_PUT_TCE, +#endif + H_SET_DABR, + H_SET_XDABR, + H_CEDE, + H_PROD, + H_CONFER, + H_REGISTER_VPA, +#ifdef CONFIG_KVM_XICS + H_EOI, + H_CPPR, + H_IPI, + H_IPOLL, + H_XIRR, + H_XIRR_X, +#endif + 0 +}; + +static void init_default_hcalls(void) +{ + int i; + unsigned int hcall; + + for (i = 0; default_hcall_list[i]; ++i) { + hcall = default_hcall_list[i]; + WARN_ON(!kvmppc_hcall_impl_hv(hcall)); + __set_bit(hcall / 4, default_enabled_hcalls); + } +} + +static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg) +{ + unsigned long lpcr; + int radix; + int err; + + /* If not on a POWER9, reject it */ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return -ENODEV; + + /* If any unknown flags set, reject it */ + if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE)) + return -EINVAL; + + /* GR (guest radix) bit in process_table field must match */ + radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX); + if (!!(cfg->process_table & PATB_GR) != radix) + return -EINVAL; + + /* Process table size field must be reasonable, i.e. <= 24 */ + if ((cfg->process_table & PRTS_MASK) > 24) + return -EINVAL; + + /* We can change a guest to/from radix now, if the host is radix */ + if (radix && !radix_enabled()) + return -EINVAL; + + /* If we're a nested hypervisor, we currently only support radix */ + if (kvmhv_on_pseries() && !radix) + return -EINVAL; + + mutex_lock(&kvm->arch.mmu_setup_lock); + if (radix != kvm_is_radix(kvm)) { + if (kvm->arch.mmu_ready) { + kvm->arch.mmu_ready = 0; + /* order mmu_ready vs. vcpus_running */ + smp_mb(); + if (atomic_read(&kvm->arch.vcpus_running)) { + kvm->arch.mmu_ready = 1; + err = -EBUSY; + goto out_unlock; + } + } + if (radix) + err = kvmppc_switch_mmu_to_radix(kvm); + else + err = kvmppc_switch_mmu_to_hpt(kvm); + if (err) + goto out_unlock; + } + + kvm->arch.process_table = cfg->process_table; + kvmppc_setup_partition_table(kvm); + + lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0; + kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE); + err = 0; + + out_unlock: + mutex_unlock(&kvm->arch.mmu_setup_lock); + return err; +} + +static int kvmhv_enable_nested(struct kvm *kvm) +{ + if (!nested) + return -EPERM; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return -ENODEV; + if (!radix_enabled()) + return -ENODEV; + + /* kvm == NULL means the caller is testing if the capability exists */ + if (kvm) + kvm->arch.nested_enable = true; + return 0; +} + +static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, + int size) +{ + int rc = -EINVAL; + + if (kvmhv_vcpu_is_radix(vcpu)) { + rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size); + + if (rc > 0) + rc = -EINVAL; + } + + /* For now quadrants are the only way to access nested guest memory */ + if (rc && vcpu->arch.nested) + rc = -EAGAIN; + + return rc; +} + +static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, + int size) +{ + int rc = -EINVAL; + + if (kvmhv_vcpu_is_radix(vcpu)) { + rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size); + + if (rc > 0) + rc = -EINVAL; + } + + /* For now quadrants are the only way to access nested guest memory */ + if (rc && vcpu->arch.nested) + rc = -EAGAIN; + + return rc; +} + +static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa) +{ + unpin_vpa(kvm, vpa); + vpa->gpa = 0; + vpa->pinned_addr = NULL; + vpa->dirty = false; + vpa->update_pending = 0; +} + +/* + * Enable a guest to become a secure VM, or test whether + * that could be enabled. + * Called when the KVM_CAP_PPC_SECURE_GUEST capability is + * tested (kvm == NULL) or enabled (kvm != NULL). + */ +static int kvmhv_enable_svm(struct kvm *kvm) +{ + if (!kvmppc_uvmem_available()) + return -EINVAL; + if (kvm) + kvm->arch.svm_enabled = 1; + return 0; +} + +/* + * IOCTL handler to turn off secure mode of guest + * + * - Release all device pages + * - Issue ucall to terminate the guest on the UV side + * - Unpin the VPA pages. + * - Reinit the partition scoped page tables + */ +static int kvmhv_svm_off(struct kvm *kvm) +{ + struct kvm_vcpu *vcpu; + int mmu_was_ready; + int srcu_idx; + int ret = 0; + unsigned long i; + + if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)) + return ret; + + mutex_lock(&kvm->arch.mmu_setup_lock); + mmu_was_ready = kvm->arch.mmu_ready; + if (kvm->arch.mmu_ready) { + kvm->arch.mmu_ready = 0; + /* order mmu_ready vs. vcpus_running */ + smp_mb(); + if (atomic_read(&kvm->arch.vcpus_running)) { + kvm->arch.mmu_ready = 1; + ret = -EBUSY; + goto out; + } + } + + srcu_idx = srcu_read_lock(&kvm->srcu); + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + struct kvm_memory_slot *memslot; + struct kvm_memslots *slots = __kvm_memslots(kvm, i); + int bkt; + + if (!slots) + continue; + + kvm_for_each_memslot(memslot, bkt, slots) { + kvmppc_uvmem_drop_pages(memslot, kvm, true); + uv_unregister_mem_slot(kvm->arch.lpid, memslot->id); + } + } + srcu_read_unlock(&kvm->srcu, srcu_idx); + + ret = uv_svm_terminate(kvm->arch.lpid); + if (ret != U_SUCCESS) { + ret = -EINVAL; + goto out; + } + + /* + * When secure guest is reset, all the guest pages are sent + * to UV via UV_PAGE_IN before the non-boot vcpus get a + * chance to run and unpin their VPA pages. Unpinning of all + * VPA pages is done here explicitly so that VPA pages + * can be migrated to the secure side. + * + * This is required to for the secure SMP guest to reboot + * correctly. + */ + kvm_for_each_vcpu(i, vcpu, kvm) { + spin_lock(&vcpu->arch.vpa_update_lock); + unpin_vpa_reset(kvm, &vcpu->arch.dtl); + unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow); + unpin_vpa_reset(kvm, &vcpu->arch.vpa); + spin_unlock(&vcpu->arch.vpa_update_lock); + } + + kvmppc_setup_partition_table(kvm); + kvm->arch.secure_guest = 0; + kvm->arch.mmu_ready = mmu_was_ready; +out: + mutex_unlock(&kvm->arch.mmu_setup_lock); + return ret; +} + +static int kvmhv_enable_dawr1(struct kvm *kvm) +{ + if (!cpu_has_feature(CPU_FTR_DAWR1)) + return -ENODEV; + + /* kvm == NULL means the caller is testing if the capability exists */ + if (kvm) + kvm->arch.dawr1_enabled = true; + return 0; +} + +static bool kvmppc_hash_v3_possible(void) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return false; + + if (!cpu_has_feature(CPU_FTR_HVMODE)) + return false; + + /* + * POWER9 chips before version 2.02 can't have some threads in + * HPT mode and some in radix mode on the same core. + */ + if (radix_enabled()) { + unsigned int pvr = mfspr(SPRN_PVR); + if ((pvr >> 16) == PVR_POWER9 && + (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) || + ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101))) + return false; + } + + return true; +} + +static struct kvmppc_ops kvm_ops_hv = { + .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, + .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, + .get_one_reg = kvmppc_get_one_reg_hv, + .set_one_reg = kvmppc_set_one_reg_hv, + .vcpu_load = kvmppc_core_vcpu_load_hv, + .vcpu_put = kvmppc_core_vcpu_put_hv, + .inject_interrupt = kvmppc_inject_interrupt_hv, + .set_msr = kvmppc_set_msr_hv, + .vcpu_run = kvmppc_vcpu_run_hv, + .vcpu_create = kvmppc_core_vcpu_create_hv, + .vcpu_free = kvmppc_core_vcpu_free_hv, + .check_requests = kvmppc_core_check_requests_hv, + .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, + .flush_memslot = kvmppc_core_flush_memslot_hv, + .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, + .commit_memory_region = kvmppc_core_commit_memory_region_hv, + .unmap_gfn_range = kvm_unmap_gfn_range_hv, + .age_gfn = kvm_age_gfn_hv, + .test_age_gfn = kvm_test_age_gfn_hv, + .set_spte_gfn = kvm_set_spte_gfn_hv, + .free_memslot = kvmppc_core_free_memslot_hv, + .init_vm = kvmppc_core_init_vm_hv, + .destroy_vm = kvmppc_core_destroy_vm_hv, + .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, + .emulate_op = kvmppc_core_emulate_op_hv, + .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, + .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, + .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, + .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, + .hcall_implemented = kvmppc_hcall_impl_hv, +#ifdef CONFIG_KVM_XICS + .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv, + .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv, +#endif + .configure_mmu = kvmhv_configure_mmu, + .get_rmmu_info = kvmhv_get_rmmu_info, + .set_smt_mode = kvmhv_set_smt_mode, + .enable_nested = kvmhv_enable_nested, + .load_from_eaddr = kvmhv_load_from_eaddr, + .store_to_eaddr = kvmhv_store_to_eaddr, + .enable_svm = kvmhv_enable_svm, + .svm_off = kvmhv_svm_off, + .enable_dawr1 = kvmhv_enable_dawr1, + .hash_v3_possible = kvmppc_hash_v3_possible, + .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv, + .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv, +}; + +static int kvm_init_subcore_bitmap(void) +{ + int i, j; + int nr_cores = cpu_nr_cores(); + struct sibling_subcore_state *sibling_subcore_state; + + for (i = 0; i < nr_cores; i++) { + int first_cpu = i * threads_per_core; + int node = cpu_to_node(first_cpu); + + /* Ignore if it is already allocated. */ + if (paca_ptrs[first_cpu]->sibling_subcore_state) + continue; + + sibling_subcore_state = + kzalloc_node(sizeof(struct sibling_subcore_state), + GFP_KERNEL, node); + if (!sibling_subcore_state) + return -ENOMEM; + + + for (j = 0; j < threads_per_core; j++) { + int cpu = first_cpu + j; + + paca_ptrs[cpu]->sibling_subcore_state = + sibling_subcore_state; + } + } + return 0; +} + +static int kvmppc_radix_possible(void) +{ + return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled(); +} + +static int kvmppc_book3s_init_hv(void) +{ + int r; + + if (!tlbie_capable) { + pr_err("KVM-HV: Host does not support TLBIE\n"); + return -ENODEV; + } + + /* + * FIXME!! Do we need to check on all cpus ? + */ + r = kvmppc_core_check_processor_compat_hv(); + if (r < 0) + return -ENODEV; + + r = kvmhv_nested_init(); + if (r) + return r; + + if (!cpu_has_feature(CPU_FTR_ARCH_300)) { + r = kvm_init_subcore_bitmap(); + if (r) + goto err; + } + + /* + * We need a way of accessing the XICS interrupt controller, + * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or + * indirectly, via OPAL. + */ +#ifdef CONFIG_SMP + if (!xics_on_xive() && !kvmhv_on_pseries() && + !local_paca->kvm_hstate.xics_phys) { + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); + if (!np) { + pr_err("KVM-HV: Cannot determine method for accessing XICS\n"); + r = -ENODEV; + goto err; + } + /* presence of intc confirmed - node can be dropped again */ + of_node_put(np); + } +#endif + + init_default_hcalls(); + + init_vcore_lists(); + + r = kvmppc_mmu_hv_init(); + if (r) + goto err; + + if (kvmppc_radix_possible()) { + r = kvmppc_radix_init(); + if (r) + goto err; + } + + r = kvmppc_uvmem_init(); + if (r < 0) { + pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r); + return r; + } + + kvm_ops_hv.owner = THIS_MODULE; + kvmppc_hv_ops = &kvm_ops_hv; + + return 0; + +err: + kvmhv_nested_exit(); + kvmppc_radix_exit(); + + return r; +} + +static void kvmppc_book3s_exit_hv(void) +{ + kvmppc_uvmem_free(); + kvmppc_free_host_rm_ops(); + if (kvmppc_radix_possible()) + kvmppc_radix_exit(); + kvmppc_hv_ops = NULL; + kvmhv_nested_exit(); +} + +module_init(kvmppc_book3s_init_hv); +module_exit(kvmppc_book3s_exit_hv); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(KVM_MINOR); +MODULE_ALIAS("devname:kvm"); |