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Diffstat (limited to '')
| -rw-r--r-- | arch/s390/kvm/priv.c | 1452 |
1 files changed, 1452 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c new file mode 100644 index 000000000..9abdfb8b1 --- /dev/null +++ b/arch/s390/kvm/priv.c @@ -0,0 +1,1452 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * handling privileged instructions + * + * Copyright IBM Corp. 2008, 2018 + * + * Author(s): Carsten Otte <cotte@de.ibm.com> + * Christian Borntraeger <borntraeger@de.ibm.com> + */ + +#include <linux/kvm.h> +#include <linux/gfp.h> +#include <linux/errno.h> +#include <linux/compat.h> +#include <linux/mm_types.h> + +#include <asm/asm-offsets.h> +#include <asm/facility.h> +#include <asm/current.h> +#include <asm/debug.h> +#include <asm/ebcdic.h> +#include <asm/sysinfo.h> +#include <asm/pgtable.h> +#include <asm/page-states.h> +#include <asm/pgalloc.h> +#include <asm/gmap.h> +#include <asm/io.h> +#include <asm/ptrace.h> +#include <asm/sclp.h> +#include "gaccess.h" +#include "kvm-s390.h" +#include "trace.h" + +static int handle_ri(struct kvm_vcpu *vcpu) +{ + vcpu->stat.instruction_ri++; + + if (test_kvm_facility(vcpu->kvm, 64)) { + VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)"); + vcpu->arch.sie_block->ecb3 |= ECB3_RI; + kvm_s390_retry_instr(vcpu); + return 0; + } else + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); +} + +int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) +{ + if ((vcpu->arch.sie_block->ipa & 0xf) <= 4) + return handle_ri(vcpu); + else + return -EOPNOTSUPP; +} + +static int handle_gs(struct kvm_vcpu *vcpu) +{ + vcpu->stat.instruction_gs++; + + if (test_kvm_facility(vcpu->kvm, 133)) { + VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); + preempt_disable(); + __ctl_set_bit(2, 4); + current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; + restore_gs_cb(current->thread.gs_cb); + preempt_enable(); + vcpu->arch.sie_block->ecb |= ECB_GS; + vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; + vcpu->arch.gs_enabled = 1; + kvm_s390_retry_instr(vcpu); + return 0; + } else + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); +} + +int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) +{ + int code = vcpu->arch.sie_block->ipb & 0xff; + + if (code == 0x49 || code == 0x4d) + return handle_gs(vcpu); + else + return -EOPNOTSUPP; +} +/* Handle SCK (SET CLOCK) interception */ +static int handle_set_clock(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_vm_tod_clock gtod = { 0 }; + int rc; + u8 ar; + u64 op2; + + vcpu->stat.instruction_sck++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + op2 = kvm_s390_get_base_disp_s(vcpu, &ar); + if (op2 & 7) /* Operand must be on a doubleword boundary */ + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + + VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod); + kvm_s390_set_tod_clock(vcpu->kvm, >od); + + kvm_s390_set_psw_cc(vcpu, 0); + return 0; +} + +static int handle_set_prefix(struct kvm_vcpu *vcpu) +{ + u64 operand2; + u32 address; + int rc; + u8 ar; + + vcpu->stat.instruction_spx++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); + + /* must be word boundary */ + if (operand2 & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + /* get the value */ + rc = read_guest(vcpu, operand2, ar, &address, sizeof(address)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + + address &= 0x7fffe000u; + + /* + * Make sure the new value is valid memory. We only need to check the + * first page, since address is 8k aligned and memory pieces are always + * at least 1MB aligned and have at least a size of 1MB. + */ + if (kvm_is_error_gpa(vcpu->kvm, address)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + kvm_s390_set_prefix(vcpu, address); + trace_kvm_s390_handle_prefix(vcpu, 1, address); + return 0; +} + +static int handle_store_prefix(struct kvm_vcpu *vcpu) +{ + u64 operand2; + u32 address; + int rc; + u8 ar; + + vcpu->stat.instruction_stpx++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); + + /* must be word boundary */ + if (operand2 & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + address = kvm_s390_get_prefix(vcpu); + + /* get the value */ + rc = write_guest(vcpu, operand2, ar, &address, sizeof(address)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + + VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2); + trace_kvm_s390_handle_prefix(vcpu, 0, address); + return 0; +} + +static int handle_store_cpu_address(struct kvm_vcpu *vcpu) +{ + u16 vcpu_id = vcpu->vcpu_id; + u64 ga; + int rc; + u8 ar; + + vcpu->stat.instruction_stap++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + ga = kvm_s390_get_base_disp_s(vcpu, &ar); + + if (ga & 1) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + + VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga); + trace_kvm_s390_handle_stap(vcpu, ga); + return 0; +} + +int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu) +{ + int rc; + + trace_kvm_s390_skey_related_inst(vcpu); + /* Already enabled? */ + if (vcpu->arch.skey_enabled) + return 0; + + rc = s390_enable_skey(); + VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc); + if (rc) + return rc; + + if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS)) + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS); + if (!vcpu->kvm->arch.use_skf) + vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; + else + vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE); + vcpu->arch.skey_enabled = true; + return 0; +} + +static int try_handle_skey(struct kvm_vcpu *vcpu) +{ + int rc; + + rc = kvm_s390_skey_check_enable(vcpu); + if (rc) + return rc; + if (vcpu->kvm->arch.use_skf) { + /* with storage-key facility, SIE interprets it for us */ + kvm_s390_retry_instr(vcpu); + VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation"); + return -EAGAIN; + } + return 0; +} + +static int handle_iske(struct kvm_vcpu *vcpu) +{ + unsigned long gaddr, vmaddr; + unsigned char key; + int reg1, reg2; + bool unlocked; + int rc; + + vcpu->stat.instruction_iske++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + rc = try_handle_skey(vcpu); + if (rc) + return rc != -EAGAIN ? rc : 0; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; + gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); + gaddr = kvm_s390_real_to_abs(vcpu, gaddr); + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); + if (kvm_is_error_hva(vmaddr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); +retry: + unlocked = false; + down_read(¤t->mm->mmap_sem); + rc = get_guest_storage_key(current->mm, vmaddr, &key); + + if (rc) { + rc = fixup_user_fault(current, current->mm, vmaddr, + FAULT_FLAG_WRITE, &unlocked); + if (!rc) { + up_read(¤t->mm->mmap_sem); + goto retry; + } + } + up_read(¤t->mm->mmap_sem); + if (rc == -EFAULT) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + if (rc < 0) + return rc; + vcpu->run->s.regs.gprs[reg1] &= ~0xff; + vcpu->run->s.regs.gprs[reg1] |= key; + return 0; +} + +static int handle_rrbe(struct kvm_vcpu *vcpu) +{ + unsigned long vmaddr, gaddr; + int reg1, reg2; + bool unlocked; + int rc; + + vcpu->stat.instruction_rrbe++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + rc = try_handle_skey(vcpu); + if (rc) + return rc != -EAGAIN ? rc : 0; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; + gaddr = kvm_s390_logical_to_effective(vcpu, gaddr); + gaddr = kvm_s390_real_to_abs(vcpu, gaddr); + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr)); + if (kvm_is_error_hva(vmaddr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); +retry: + unlocked = false; + down_read(¤t->mm->mmap_sem); + rc = reset_guest_reference_bit(current->mm, vmaddr); + if (rc < 0) { + rc = fixup_user_fault(current, current->mm, vmaddr, + FAULT_FLAG_WRITE, &unlocked); + if (!rc) { + up_read(¤t->mm->mmap_sem); + goto retry; + } + } + up_read(¤t->mm->mmap_sem); + if (rc == -EFAULT) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + if (rc < 0) + return rc; + kvm_s390_set_psw_cc(vcpu, rc); + return 0; +} + +#define SSKE_NQ 0x8 +#define SSKE_MR 0x4 +#define SSKE_MC 0x2 +#define SSKE_MB 0x1 +static int handle_sske(struct kvm_vcpu *vcpu) +{ + unsigned char m3 = vcpu->arch.sie_block->ipb >> 28; + unsigned long start, end; + unsigned char key, oldkey; + int reg1, reg2; + bool unlocked; + int rc; + + vcpu->stat.instruction_sske++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + rc = try_handle_skey(vcpu); + if (rc) + return rc != -EAGAIN ? rc : 0; + + if (!test_kvm_facility(vcpu->kvm, 8)) + m3 &= ~SSKE_MB; + if (!test_kvm_facility(vcpu->kvm, 10)) + m3 &= ~(SSKE_MC | SSKE_MR); + if (!test_kvm_facility(vcpu->kvm, 14)) + m3 &= ~SSKE_NQ; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + key = vcpu->run->s.regs.gprs[reg1] & 0xfe; + start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; + start = kvm_s390_logical_to_effective(vcpu, start); + if (m3 & SSKE_MB) { + /* start already designates an absolute address */ + end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); + } else { + start = kvm_s390_real_to_abs(vcpu, start); + end = start + PAGE_SIZE; + } + + while (start != end) { + unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); + unlocked = false; + + if (kvm_is_error_hva(vmaddr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + down_read(¤t->mm->mmap_sem); + rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey, + m3 & SSKE_NQ, m3 & SSKE_MR, + m3 & SSKE_MC); + + if (rc < 0) { + rc = fixup_user_fault(current, current->mm, vmaddr, + FAULT_FLAG_WRITE, &unlocked); + rc = !rc ? -EAGAIN : rc; + } + up_read(¤t->mm->mmap_sem); + if (rc == -EFAULT) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + if (rc == -EAGAIN) + continue; + if (rc < 0) + return rc; + start += PAGE_SIZE; + } + + if (m3 & (SSKE_MC | SSKE_MR)) { + if (m3 & SSKE_MB) { + /* skey in reg1 is unpredictable */ + kvm_s390_set_psw_cc(vcpu, 3); + } else { + kvm_s390_set_psw_cc(vcpu, rc); + vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL; + vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8; + } + } + if (m3 & SSKE_MB) { + if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) + vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; + else + vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; + end = kvm_s390_logical_to_effective(vcpu, end); + vcpu->run->s.regs.gprs[reg2] |= end; + } + return 0; +} + +static int handle_ipte_interlock(struct kvm_vcpu *vcpu) +{ + vcpu->stat.instruction_ipte_interlock++; + if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); + kvm_s390_retry_instr(vcpu); + VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation"); + return 0; +} + +static int handle_test_block(struct kvm_vcpu *vcpu) +{ + gpa_t addr; + int reg2; + + vcpu->stat.instruction_tb++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + kvm_s390_get_regs_rre(vcpu, NULL, ®2); + addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; + addr = kvm_s390_logical_to_effective(vcpu, addr); + if (kvm_s390_check_low_addr_prot_real(vcpu, addr)) + return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); + addr = kvm_s390_real_to_abs(vcpu, addr); + + if (kvm_is_error_gpa(vcpu->kvm, addr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + /* + * We don't expect errors on modern systems, and do not care + * about storage keys (yet), so let's just clear the page. + */ + if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE)) + return -EFAULT; + kvm_s390_set_psw_cc(vcpu, 0); + vcpu->run->s.regs.gprs[0] = 0; + return 0; +} + +static int handle_tpi(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_interrupt_info *inti; + unsigned long len; + u32 tpi_data[3]; + int rc; + u64 addr; + u8 ar; + + vcpu->stat.instruction_tpi++; + + addr = kvm_s390_get_base_disp_s(vcpu, &ar); + if (addr & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0); + if (!inti) { + kvm_s390_set_psw_cc(vcpu, 0); + return 0; + } + + tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr; + tpi_data[1] = inti->io.io_int_parm; + tpi_data[2] = inti->io.io_int_word; + if (addr) { + /* + * Store the two-word I/O interruption code into the + * provided area. + */ + len = sizeof(tpi_data) - 4; + rc = write_guest(vcpu, addr, ar, &tpi_data, len); + if (rc) { + rc = kvm_s390_inject_prog_cond(vcpu, rc); + goto reinject_interrupt; + } + } else { + /* + * Store the three-word I/O interruption code into + * the appropriate lowcore area. + */ + len = sizeof(tpi_data); + if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) { + /* failed writes to the low core are not recoverable */ + rc = -EFAULT; + goto reinject_interrupt; + } + } + + /* irq was successfully handed to the guest */ + kfree(inti); + kvm_s390_set_psw_cc(vcpu, 1); + return 0; +reinject_interrupt: + /* + * If we encounter a problem storing the interruption code, the + * instruction is suppressed from the guest's view: reinject the + * interrupt. + */ + if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) { + kfree(inti); + rc = -EFAULT; + } + /* don't set the cc, a pgm irq was injected or we drop to user space */ + return rc ? -EFAULT : 0; +} + +static int handle_tsch(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_interrupt_info *inti = NULL; + const u64 isc_mask = 0xffUL << 24; /* all iscs set */ + + vcpu->stat.instruction_tsch++; + + /* a valid schid has at least one bit set */ + if (vcpu->run->s.regs.gprs[1]) + inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask, + vcpu->run->s.regs.gprs[1]); + + /* + * Prepare exit to userspace. + * We indicate whether we dequeued a pending I/O interrupt + * so that userspace can re-inject it if the instruction gets + * a program check. While this may re-order the pending I/O + * interrupts, this is no problem since the priority is kept + * intact. + */ + vcpu->run->exit_reason = KVM_EXIT_S390_TSCH; + vcpu->run->s390_tsch.dequeued = !!inti; + if (inti) { + vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id; + vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr; + vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm; + vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word; + } + vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb; + kfree(inti); + return -EREMOTE; +} + +static int handle_io_inst(struct kvm_vcpu *vcpu) +{ + VCPU_EVENT(vcpu, 4, "%s", "I/O instruction"); + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + if (vcpu->kvm->arch.css_support) { + /* + * Most I/O instructions will be handled by userspace. + * Exceptions are tpi and the interrupt portion of tsch. + */ + if (vcpu->arch.sie_block->ipa == 0xb236) + return handle_tpi(vcpu); + if (vcpu->arch.sie_block->ipa == 0xb235) + return handle_tsch(vcpu); + /* Handle in userspace. */ + vcpu->stat.instruction_io_other++; + return -EOPNOTSUPP; + } else { + /* + * Set condition code 3 to stop the guest from issuing channel + * I/O instructions. + */ + kvm_s390_set_psw_cc(vcpu, 3); + return 0; + } +} + +static int handle_stfl(struct kvm_vcpu *vcpu) +{ + int rc; + unsigned int fac; + + vcpu->stat.instruction_stfl++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + /* + * We need to shift the lower 32 facility bits (bit 0-31) from a u64 + * into a u32 memory representation. They will remain bits 0-31. + */ + fac = *vcpu->kvm->arch.model.fac_list >> 32; + rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list), + &fac, sizeof(fac)); + if (rc) + return rc; + VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac); + trace_kvm_s390_handle_stfl(vcpu, fac); + return 0; +} + +#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA) +#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL +#define PSW_ADDR_24 0x0000000000ffffffUL +#define PSW_ADDR_31 0x000000007fffffffUL + +int is_valid_psw(psw_t *psw) +{ + if (psw->mask & PSW_MASK_UNASSIGNED) + return 0; + if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) { + if (psw->addr & ~PSW_ADDR_31) + return 0; + } + if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24)) + return 0; + if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA) + return 0; + if (psw->addr & 1) + return 0; + return 1; +} + +int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu) +{ + psw_t *gpsw = &vcpu->arch.sie_block->gpsw; + psw_compat_t new_psw; + u64 addr; + int rc; + u8 ar; + + vcpu->stat.instruction_lpsw++; + + if (gpsw->mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + addr = kvm_s390_get_base_disp_s(vcpu, &ar); + if (addr & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + if (!(new_psw.mask & PSW32_MASK_BASE)) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32; + gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE; + gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE; + if (!is_valid_psw(gpsw)) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + return 0; +} + +static int handle_lpswe(struct kvm_vcpu *vcpu) +{ + psw_t new_psw; + u64 addr; + int rc; + u8 ar; + + vcpu->stat.instruction_lpswe++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + addr = kvm_s390_get_base_disp_s(vcpu, &ar); + if (addr & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + vcpu->arch.sie_block->gpsw = new_psw; + if (!is_valid_psw(&vcpu->arch.sie_block->gpsw)) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + return 0; +} + +static int handle_stidp(struct kvm_vcpu *vcpu) +{ + u64 stidp_data = vcpu->kvm->arch.model.cpuid; + u64 operand2; + int rc; + u8 ar; + + vcpu->stat.instruction_stidp++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); + + if (operand2 & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + + VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data); + return 0; +} + +static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem) +{ + int cpus = 0; + int n; + + cpus = atomic_read(&vcpu->kvm->online_vcpus); + + /* deal with other level 3 hypervisors */ + if (stsi(mem, 3, 2, 2)) + mem->count = 0; + if (mem->count < 8) + mem->count++; + for (n = mem->count - 1; n > 0 ; n--) + memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0])); + + memset(&mem->vm[0], 0, sizeof(mem->vm[0])); + mem->vm[0].cpus_total = cpus; + mem->vm[0].cpus_configured = cpus; + mem->vm[0].cpus_standby = 0; + mem->vm[0].cpus_reserved = 0; + mem->vm[0].caf = 1000; + memcpy(mem->vm[0].name, "KVMguest", 8); + ASCEBC(mem->vm[0].name, 8); + memcpy(mem->vm[0].cpi, "KVM/Linux ", 16); + ASCEBC(mem->vm[0].cpi, 16); +} + +static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar, + u8 fc, u8 sel1, u16 sel2) +{ + vcpu->run->exit_reason = KVM_EXIT_S390_STSI; + vcpu->run->s390_stsi.addr = addr; + vcpu->run->s390_stsi.ar = ar; + vcpu->run->s390_stsi.fc = fc; + vcpu->run->s390_stsi.sel1 = sel1; + vcpu->run->s390_stsi.sel2 = sel2; +} + +static int handle_stsi(struct kvm_vcpu *vcpu) +{ + int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28; + int sel1 = vcpu->run->s.regs.gprs[0] & 0xff; + int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff; + unsigned long mem = 0; + u64 operand2; + int rc = 0; + u8 ar; + + vcpu->stat.instruction_stsi++; + VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2); + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + if (fc > 3) { + kvm_s390_set_psw_cc(vcpu, 3); + return 0; + } + + if (vcpu->run->s.regs.gprs[0] & 0x0fffff00 + || vcpu->run->s.regs.gprs[1] & 0xffff0000) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + if (fc == 0) { + vcpu->run->s.regs.gprs[0] = 3 << 28; + kvm_s390_set_psw_cc(vcpu, 0); + return 0; + } + + operand2 = kvm_s390_get_base_disp_s(vcpu, &ar); + + if (operand2 & 0xfff) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + switch (fc) { + case 1: /* same handling for 1 and 2 */ + case 2: + mem = get_zeroed_page(GFP_KERNEL); + if (!mem) + goto out_no_data; + if (stsi((void *) mem, fc, sel1, sel2)) + goto out_no_data; + break; + case 3: + if (sel1 != 2 || sel2 != 2) + goto out_no_data; + mem = get_zeroed_page(GFP_KERNEL); + if (!mem) + goto out_no_data; + handle_stsi_3_2_2(vcpu, (void *) mem); + break; + } + + rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); + if (rc) { + rc = kvm_s390_inject_prog_cond(vcpu, rc); + goto out; + } + if (vcpu->kvm->arch.user_stsi) { + insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2); + rc = -EREMOTE; + } + trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2); + free_page(mem); + kvm_s390_set_psw_cc(vcpu, 0); + vcpu->run->s.regs.gprs[0] = 0; + return rc; +out_no_data: + kvm_s390_set_psw_cc(vcpu, 3); +out: + free_page(mem); + return rc; +} + +int kvm_s390_handle_b2(struct kvm_vcpu *vcpu) +{ + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x02: + return handle_stidp(vcpu); + case 0x04: + return handle_set_clock(vcpu); + case 0x10: + return handle_set_prefix(vcpu); + case 0x11: + return handle_store_prefix(vcpu); + case 0x12: + return handle_store_cpu_address(vcpu); + case 0x14: + return kvm_s390_handle_vsie(vcpu); + case 0x21: + case 0x50: + return handle_ipte_interlock(vcpu); + case 0x29: + return handle_iske(vcpu); + case 0x2a: + return handle_rrbe(vcpu); + case 0x2b: + return handle_sske(vcpu); + case 0x2c: + return handle_test_block(vcpu); + case 0x30: + case 0x31: + case 0x32: + case 0x33: + case 0x34: + case 0x35: + case 0x36: + case 0x37: + case 0x38: + case 0x39: + case 0x3a: + case 0x3b: + case 0x3c: + case 0x5f: + case 0x74: + case 0x76: + return handle_io_inst(vcpu); + case 0x56: + return handle_sthyi(vcpu); + case 0x7d: + return handle_stsi(vcpu); + case 0xb1: + return handle_stfl(vcpu); + case 0xb2: + return handle_lpswe(vcpu); + default: + return -EOPNOTSUPP; + } +} + +static int handle_epsw(struct kvm_vcpu *vcpu) +{ + int reg1, reg2; + + vcpu->stat.instruction_epsw++; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + /* This basically extracts the mask half of the psw. */ + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL; + vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32; + if (reg2) { + vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL; + vcpu->run->s.regs.gprs[reg2] |= + vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL; + } + return 0; +} + +#define PFMF_RESERVED 0xfffc0101UL +#define PFMF_SK 0x00020000UL +#define PFMF_CF 0x00010000UL +#define PFMF_UI 0x00008000UL +#define PFMF_FSC 0x00007000UL +#define PFMF_NQ 0x00000800UL +#define PFMF_MR 0x00000400UL +#define PFMF_MC 0x00000200UL +#define PFMF_KEY 0x000000feUL + +static int handle_pfmf(struct kvm_vcpu *vcpu) +{ + bool mr = false, mc = false, nq; + int reg1, reg2; + unsigned long start, end; + unsigned char key; + + vcpu->stat.instruction_pfmf++; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + if (!test_kvm_facility(vcpu->kvm, 8)) + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + /* Only provide non-quiescing support if enabled for the guest */ + if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && + !test_kvm_facility(vcpu->kvm, 14)) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + /* Only provide conditional-SSKE support if enabled for the guest */ + if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK && + test_kvm_facility(vcpu->kvm, 10)) { + mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR; + mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC; + } + + nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ; + key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY; + start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK; + start = kvm_s390_logical_to_effective(vcpu, start); + + if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { + if (kvm_s390_check_low_addr_prot_real(vcpu, start)) + return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); + } + + switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { + case 0x00000000: + /* only 4k frames specify a real address */ + start = kvm_s390_real_to_abs(vcpu, start); + end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1); + break; + case 0x00001000: + end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1); + break; + case 0x00002000: + /* only support 2G frame size if EDAT2 is available and we are + not in 24-bit addressing mode */ + if (!test_kvm_facility(vcpu->kvm, 78) || + psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1); + break; + default: + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + } + + while (start != end) { + unsigned long vmaddr; + bool unlocked = false; + + /* Translate guest address to host address */ + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start)); + if (kvm_is_error_hva(vmaddr)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) { + if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + } + + if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) { + int rc = kvm_s390_skey_check_enable(vcpu); + + if (rc) + return rc; + down_read(¤t->mm->mmap_sem); + rc = cond_set_guest_storage_key(current->mm, vmaddr, + key, NULL, nq, mr, mc); + if (rc < 0) { + rc = fixup_user_fault(current, current->mm, vmaddr, + FAULT_FLAG_WRITE, &unlocked); + rc = !rc ? -EAGAIN : rc; + } + up_read(¤t->mm->mmap_sem); + if (rc == -EFAULT) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + if (rc == -EAGAIN) + continue; + if (rc < 0) + return rc; + } + start += PAGE_SIZE; + } + if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { + if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { + vcpu->run->s.regs.gprs[reg2] = end; + } else { + vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; + end = kvm_s390_logical_to_effective(vcpu, end); + vcpu->run->s.regs.gprs[reg2] |= end; + } + } + return 0; +} + +/* + * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu) + */ +static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc) +{ + int r1, r2, nappended, entries; + unsigned long gfn, hva, res, pgstev, ptev; + unsigned long *cbrlo; + + /* + * We don't need to set SD.FPF.SK to 1 here, because if we have a + * machine check here we either handle it or crash + */ + + kvm_s390_get_regs_rre(vcpu, &r1, &r2); + gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; + hva = gfn_to_hva(vcpu->kvm, gfn); + entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; + + if (kvm_is_error_hva(hva)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); + if (nappended < 0) { + res = orc ? 0x10 : 0; + vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ + return 0; + } + res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; + /* + * Set the block-content state part of the result. 0 means resident, so + * nothing to do if the page is valid. 2 is for preserved pages + * (non-present and non-zero), and 3 for zero pages (non-present and + * zero). + */ + if (ptev & _PAGE_INVALID) { + res |= 2; + if (pgstev & _PGSTE_GPS_ZERO) + res |= 1; + } + if (pgstev & _PGSTE_GPS_NODAT) + res |= 0x20; + vcpu->run->s.regs.gprs[r1] = res; + /* + * It is possible that all the normal 511 slots were full, in which case + * we will now write in the 512th slot, which is reserved for host use. + * In both cases we let the normal essa handling code process all the + * slots, including the reserved one, if needed. + */ + if (nappended > 0) { + cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); + cbrlo[entries] = gfn << PAGE_SHIFT; + } + + if (orc) { + struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn); + + /* Increment only if we are really flipping the bit */ + if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) + atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages); + } + + return nappended; +} + +static int handle_essa(struct kvm_vcpu *vcpu) +{ + /* entries expected to be 1FF */ + int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; + unsigned long *cbrlo; + struct gmap *gmap; + int i, orc; + + VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); + gmap = vcpu->arch.gmap; + vcpu->stat.instruction_essa++; + if (!vcpu->kvm->arch.use_cmma) + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + /* Check for invalid operation request code */ + orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; + /* ORCs 0-6 are always valid */ + if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT + : ESSA_SET_STABLE_IF_RESIDENT)) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + if (!vcpu->kvm->arch.migration_mode) { + /* + * CMMA is enabled in the KVM settings, but is disabled in + * the SIE block and in the mm_context, and we are not doing + * a migration. Enable CMMA in the mm_context. + * Since we need to take a write lock to write to the context + * to avoid races with storage keys handling, we check if the + * value really needs to be written to; if the value is + * already correct, we do nothing and avoid the lock. + */ + if (vcpu->kvm->mm->context.uses_cmm == 0) { + down_write(&vcpu->kvm->mm->mmap_sem); + vcpu->kvm->mm->context.uses_cmm = 1; + up_write(&vcpu->kvm->mm->mmap_sem); + } + /* + * If we are here, we are supposed to have CMMA enabled in + * the SIE block. Enabling CMMA works on a per-CPU basis, + * while the context use_cmma flag is per process. + * It's possible that the context flag is enabled and the + * SIE flag is not, so we set the flag always; if it was + * already set, nothing changes, otherwise we enable it + * on this CPU too. + */ + vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; + /* Retry the ESSA instruction */ + kvm_s390_retry_instr(vcpu); + } else { + int srcu_idx; + + down_read(&vcpu->kvm->mm->mmap_sem); + srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + i = __do_essa(vcpu, orc); + srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); + up_read(&vcpu->kvm->mm->mmap_sem); + if (i < 0) + return i; + /* Account for the possible extra cbrl entry */ + entries += i; + } + vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ + cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); + down_read(&gmap->mm->mmap_sem); + for (i = 0; i < entries; ++i) + __gmap_zap(gmap, cbrlo[i]); + up_read(&gmap->mm->mmap_sem); + return 0; +} + +int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) +{ + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x8a: + case 0x8e: + case 0x8f: + return handle_ipte_interlock(vcpu); + case 0x8d: + return handle_epsw(vcpu); + case 0xab: + return handle_essa(vcpu); + case 0xaf: + return handle_pfmf(vcpu); + default: + return -EOPNOTSUPP; + } +} + +int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu) +{ + int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; + int reg3 = vcpu->arch.sie_block->ipa & 0x000f; + int reg, rc, nr_regs; + u32 ctl_array[16]; + u64 ga; + u8 ar; + + vcpu->stat.instruction_lctl++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + ga = kvm_s390_get_base_disp_rs(vcpu, &ar); + + if (ga & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); + trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga); + + nr_regs = ((reg3 - reg1) & 0xf) + 1; + rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + reg = reg1; + nr_regs = 0; + do { + vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul; + vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++]; + if (reg == reg3) + break; + reg = (reg + 1) % 16; + } while (1); + kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + return 0; +} + +int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu) +{ + int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; + int reg3 = vcpu->arch.sie_block->ipa & 0x000f; + int reg, rc, nr_regs; + u32 ctl_array[16]; + u64 ga; + u8 ar; + + vcpu->stat.instruction_stctl++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + ga = kvm_s390_get_base_disp_rs(vcpu, &ar); + + if (ga & 3) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); + trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga); + + reg = reg1; + nr_regs = 0; + do { + ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; + if (reg == reg3) + break; + reg = (reg + 1) % 16; + } while (1); + rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32)); + return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; +} + +static int handle_lctlg(struct kvm_vcpu *vcpu) +{ + int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; + int reg3 = vcpu->arch.sie_block->ipa & 0x000f; + int reg, rc, nr_regs; + u64 ctl_array[16]; + u64 ga; + u8 ar; + + vcpu->stat.instruction_lctlg++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); + + if (ga & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); + trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga); + + nr_regs = ((reg3 - reg1) & 0xf) + 1; + rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); + if (rc) + return kvm_s390_inject_prog_cond(vcpu, rc); + reg = reg1; + nr_regs = 0; + do { + vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++]; + if (reg == reg3) + break; + reg = (reg + 1) % 16; + } while (1); + kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + return 0; +} + +static int handle_stctg(struct kvm_vcpu *vcpu) +{ + int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4; + int reg3 = vcpu->arch.sie_block->ipa & 0x000f; + int reg, rc, nr_regs; + u64 ctl_array[16]; + u64 ga; + u8 ar; + + vcpu->stat.instruction_stctg++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + ga = kvm_s390_get_base_disp_rsy(vcpu, &ar); + + if (ga & 7) + return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); + + VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga); + trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga); + + reg = reg1; + nr_regs = 0; + do { + ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg]; + if (reg == reg3) + break; + reg = (reg + 1) % 16; + } while (1); + rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64)); + return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0; +} + +int kvm_s390_handle_eb(struct kvm_vcpu *vcpu) +{ + switch (vcpu->arch.sie_block->ipb & 0x000000ff) { + case 0x25: + return handle_stctg(vcpu); + case 0x2f: + return handle_lctlg(vcpu); + case 0x60: + case 0x61: + case 0x62: + return handle_ri(vcpu); + default: + return -EOPNOTSUPP; + } +} + +static int handle_tprot(struct kvm_vcpu *vcpu) +{ + u64 address1, address2; + unsigned long hva, gpa; + int ret = 0, cc = 0; + bool writable; + u8 ar; + + vcpu->stat.instruction_tprot++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL); + + /* we only handle the Linux memory detection case: + * access key == 0 + * everything else goes to userspace. */ + if (address2 & 0xf0) + return -EOPNOTSUPP; + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) + ipte_lock(vcpu); + ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE); + if (ret == PGM_PROTECTION) { + /* Write protected? Try again with read-only... */ + cc = 1; + ret = guest_translate_address(vcpu, address1, ar, &gpa, + GACC_FETCH); + } + if (ret) { + if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) { + ret = kvm_s390_inject_program_int(vcpu, ret); + } else if (ret > 0) { + /* Translation not available */ + kvm_s390_set_psw_cc(vcpu, 3); + ret = 0; + } + goto out_unlock; + } + + hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable); + if (kvm_is_error_hva(hva)) { + ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + } else { + if (!writable) + cc = 1; /* Write not permitted ==> read-only */ + kvm_s390_set_psw_cc(vcpu, cc); + /* Note: CC2 only occurs for storage keys (not supported yet) */ + } +out_unlock: + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT) + ipte_unlock(vcpu); + return ret; +} + +int kvm_s390_handle_e5(struct kvm_vcpu *vcpu) +{ + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x01: + return handle_tprot(vcpu); + default: + return -EOPNOTSUPP; + } +} + +static int handle_sckpf(struct kvm_vcpu *vcpu) +{ + u32 value; + + vcpu->stat.instruction_sckpf++; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000) + return kvm_s390_inject_program_int(vcpu, + PGM_SPECIFICATION); + + value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff; + vcpu->arch.sie_block->todpr = value; + + return 0; +} + +static int handle_ptff(struct kvm_vcpu *vcpu) +{ + vcpu->stat.instruction_ptff++; + + /* we don't emulate any control instructions yet */ + kvm_s390_set_psw_cc(vcpu, 3); + return 0; +} + +int kvm_s390_handle_01(struct kvm_vcpu *vcpu) +{ + switch (vcpu->arch.sie_block->ipa & 0x00ff) { + case 0x04: + return handle_ptff(vcpu); + case 0x07: + return handle_sckpf(vcpu); + default: + return -EOPNOTSUPP; + } +} |