diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 5895 |
1 files changed, 5895 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c new file mode 100644 index 0000000000..b3f17e014c --- /dev/null +++ b/arch/s390/kvm/kvm-s390.c @@ -0,0 +1,5895 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * hosting IBM Z kernel virtual machines (s390x) + * + * Copyright IBM Corp. 2008, 2020 + * + * Author(s): Carsten Otte <cotte@de.ibm.com> + * Christian Borntraeger <borntraeger@de.ibm.com> + * Christian Ehrhardt <ehrhardt@de.ibm.com> + * Jason J. Herne <jjherne@us.ibm.com> + */ + +#define KMSG_COMPONENT "kvm-s390" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/compiler.h> +#include <linux/err.h> +#include <linux/fs.h> +#include <linux/hrtimer.h> +#include <linux/init.h> +#include <linux/kvm.h> +#include <linux/kvm_host.h> +#include <linux/mman.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/random.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/vmalloc.h> +#include <linux/bitmap.h> +#include <linux/sched/signal.h> +#include <linux/string.h> +#include <linux/pgtable.h> +#include <linux/mmu_notifier.h> + +#include <asm/asm-offsets.h> +#include <asm/lowcore.h> +#include <asm/stp.h> +#include <asm/gmap.h> +#include <asm/nmi.h> +#include <asm/switch_to.h> +#include <asm/isc.h> +#include <asm/sclp.h> +#include <asm/cpacf.h> +#include <asm/timex.h> +#include <asm/ap.h> +#include <asm/uv.h> +#include <asm/fpu/api.h> +#include "kvm-s390.h" +#include "gaccess.h" +#include "pci.h" + +#define CREATE_TRACE_POINTS +#include "trace.h" +#include "trace-s390.h" + +#define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ +#define LOCAL_IRQS 32 +#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ + (KVM_MAX_VCPUS + LOCAL_IRQS)) + +const struct _kvm_stats_desc kvm_vm_stats_desc[] = { + KVM_GENERIC_VM_STATS(), + STATS_DESC_COUNTER(VM, inject_io), + STATS_DESC_COUNTER(VM, inject_float_mchk), + STATS_DESC_COUNTER(VM, inject_pfault_done), + STATS_DESC_COUNTER(VM, inject_service_signal), + STATS_DESC_COUNTER(VM, inject_virtio), + STATS_DESC_COUNTER(VM, aen_forward) +}; + +const struct kvm_stats_header kvm_vm_stats_header = { + .name_size = KVM_STATS_NAME_SIZE, + .num_desc = ARRAY_SIZE(kvm_vm_stats_desc), + .id_offset = sizeof(struct kvm_stats_header), + .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, + .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + + sizeof(kvm_vm_stats_desc), +}; + +const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { + KVM_GENERIC_VCPU_STATS(), + STATS_DESC_COUNTER(VCPU, exit_userspace), + STATS_DESC_COUNTER(VCPU, exit_null), + STATS_DESC_COUNTER(VCPU, exit_external_request), + STATS_DESC_COUNTER(VCPU, exit_io_request), + STATS_DESC_COUNTER(VCPU, exit_external_interrupt), + STATS_DESC_COUNTER(VCPU, exit_stop_request), + STATS_DESC_COUNTER(VCPU, exit_validity), + STATS_DESC_COUNTER(VCPU, exit_instruction), + STATS_DESC_COUNTER(VCPU, exit_pei), + STATS_DESC_COUNTER(VCPU, halt_no_poll_steal), + STATS_DESC_COUNTER(VCPU, instruction_lctl), + STATS_DESC_COUNTER(VCPU, instruction_lctlg), + STATS_DESC_COUNTER(VCPU, instruction_stctl), + STATS_DESC_COUNTER(VCPU, instruction_stctg), + STATS_DESC_COUNTER(VCPU, exit_program_interruption), + STATS_DESC_COUNTER(VCPU, exit_instr_and_program), + STATS_DESC_COUNTER(VCPU, exit_operation_exception), + STATS_DESC_COUNTER(VCPU, deliver_ckc), + STATS_DESC_COUNTER(VCPU, deliver_cputm), + STATS_DESC_COUNTER(VCPU, deliver_external_call), + STATS_DESC_COUNTER(VCPU, deliver_emergency_signal), + STATS_DESC_COUNTER(VCPU, deliver_service_signal), + STATS_DESC_COUNTER(VCPU, deliver_virtio), + STATS_DESC_COUNTER(VCPU, deliver_stop_signal), + STATS_DESC_COUNTER(VCPU, deliver_prefix_signal), + STATS_DESC_COUNTER(VCPU, deliver_restart_signal), + STATS_DESC_COUNTER(VCPU, deliver_program), + STATS_DESC_COUNTER(VCPU, deliver_io), + STATS_DESC_COUNTER(VCPU, deliver_machine_check), + STATS_DESC_COUNTER(VCPU, exit_wait_state), + STATS_DESC_COUNTER(VCPU, inject_ckc), + STATS_DESC_COUNTER(VCPU, inject_cputm), + STATS_DESC_COUNTER(VCPU, inject_external_call), + STATS_DESC_COUNTER(VCPU, inject_emergency_signal), + STATS_DESC_COUNTER(VCPU, inject_mchk), + STATS_DESC_COUNTER(VCPU, inject_pfault_init), + STATS_DESC_COUNTER(VCPU, inject_program), + STATS_DESC_COUNTER(VCPU, inject_restart), + STATS_DESC_COUNTER(VCPU, inject_set_prefix), + STATS_DESC_COUNTER(VCPU, inject_stop_signal), + STATS_DESC_COUNTER(VCPU, instruction_epsw), + STATS_DESC_COUNTER(VCPU, instruction_gs), + STATS_DESC_COUNTER(VCPU, instruction_io_other), + STATS_DESC_COUNTER(VCPU, instruction_lpsw), + STATS_DESC_COUNTER(VCPU, instruction_lpswe), + STATS_DESC_COUNTER(VCPU, instruction_pfmf), + STATS_DESC_COUNTER(VCPU, instruction_ptff), + STATS_DESC_COUNTER(VCPU, instruction_sck), + STATS_DESC_COUNTER(VCPU, instruction_sckpf), + STATS_DESC_COUNTER(VCPU, instruction_stidp), + STATS_DESC_COUNTER(VCPU, instruction_spx), + STATS_DESC_COUNTER(VCPU, instruction_stpx), + STATS_DESC_COUNTER(VCPU, instruction_stap), + STATS_DESC_COUNTER(VCPU, instruction_iske), + STATS_DESC_COUNTER(VCPU, instruction_ri), + STATS_DESC_COUNTER(VCPU, instruction_rrbe), + STATS_DESC_COUNTER(VCPU, instruction_sske), + STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock), + STATS_DESC_COUNTER(VCPU, instruction_stsi), + STATS_DESC_COUNTER(VCPU, instruction_stfl), + STATS_DESC_COUNTER(VCPU, instruction_tb), + STATS_DESC_COUNTER(VCPU, instruction_tpi), + STATS_DESC_COUNTER(VCPU, instruction_tprot), + STATS_DESC_COUNTER(VCPU, instruction_tsch), + STATS_DESC_COUNTER(VCPU, instruction_sie), + STATS_DESC_COUNTER(VCPU, instruction_essa), + STATS_DESC_COUNTER(VCPU, instruction_sthyi), + STATS_DESC_COUNTER(VCPU, instruction_sigp_sense), + STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running), + STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call), + STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency), + STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency), + STATS_DESC_COUNTER(VCPU, instruction_sigp_start), + STATS_DESC_COUNTER(VCPU, instruction_sigp_stop), + STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status), + STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status), + STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status), + STATS_DESC_COUNTER(VCPU, instruction_sigp_arch), + STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix), + STATS_DESC_COUNTER(VCPU, instruction_sigp_restart), + STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset), + STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset), + STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_10), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_44), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c), + STATS_DESC_COUNTER(VCPU, diag_9c_ignored), + STATS_DESC_COUNTER(VCPU, diag_9c_forward), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_258), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_308), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_500), + STATS_DESC_COUNTER(VCPU, instruction_diagnose_other), + STATS_DESC_COUNTER(VCPU, pfault_sync) +}; + +const struct kvm_stats_header kvm_vcpu_stats_header = { + .name_size = KVM_STATS_NAME_SIZE, + .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc), + .id_offset = sizeof(struct kvm_stats_header), + .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, + .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + + sizeof(kvm_vcpu_stats_desc), +}; + +/* allow nested virtualization in KVM (if enabled by user space) */ +static int nested; +module_param(nested, int, S_IRUGO); +MODULE_PARM_DESC(nested, "Nested virtualization support"); + +/* allow 1m huge page guest backing, if !nested */ +static int hpage; +module_param(hpage, int, 0444); +MODULE_PARM_DESC(hpage, "1m huge page backing support"); + +/* maximum percentage of steal time for polling. >100 is treated like 100 */ +static u8 halt_poll_max_steal = 10; +module_param(halt_poll_max_steal, byte, 0644); +MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling"); + +/* if set to true, the GISA will be initialized and used if available */ +static bool use_gisa = true; +module_param(use_gisa, bool, 0644); +MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it."); + +/* maximum diag9c forwarding per second */ +unsigned int diag9c_forwarding_hz; +module_param(diag9c_forwarding_hz, uint, 0644); +MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off"); + +/* + * allow asynchronous deinit for protected guests; enable by default since + * the feature is opt-in anyway + */ +static int async_destroy = 1; +module_param(async_destroy, int, 0444); +MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests"); + +/* + * For now we handle at most 16 double words as this is what the s390 base + * kernel handles and stores in the prefix page. If we ever need to go beyond + * this, this requires changes to code, but the external uapi can stay. + */ +#define SIZE_INTERNAL 16 + +/* + * Base feature mask that defines default mask for facilities. Consists of the + * defines in FACILITIES_KVM and the non-hypervisor managed bits. + */ +static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM }; +/* + * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL + * and defines the facilities that can be enabled via a cpu model. + */ +static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL }; + +static unsigned long kvm_s390_fac_size(void) +{ + BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64); + BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64); + BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) > + sizeof(stfle_fac_list)); + + return SIZE_INTERNAL; +} + +/* available cpu features supported by kvm */ +static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); +/* available subfunctions indicated via query / "test bit" */ +static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; + +static struct gmap_notifier gmap_notifier; +static struct gmap_notifier vsie_gmap_notifier; +debug_info_t *kvm_s390_dbf; +debug_info_t *kvm_s390_dbf_uv; + +/* Section: not file related */ +/* forward declarations */ +static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, + unsigned long end); +static int sca_switch_to_extended(struct kvm *kvm); + +static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) +{ + u8 delta_idx = 0; + + /* + * The TOD jumps by delta, we have to compensate this by adding + * -delta to the epoch. + */ + delta = -delta; + + /* sign-extension - we're adding to signed values below */ + if ((s64)delta < 0) + delta_idx = -1; + + scb->epoch += delta; + if (scb->ecd & ECD_MEF) { + scb->epdx += delta_idx; + if (scb->epoch < delta) + scb->epdx += 1; + } +} + +/* + * This callback is executed during stop_machine(). All CPUs are therefore + * temporarily stopped. In order not to change guest behavior, we have to + * disable preemption whenever we touch the epoch of kvm and the VCPUs, + * so a CPU won't be stopped while calculating with the epoch. + */ +static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, + void *v) +{ + struct kvm *kvm; + struct kvm_vcpu *vcpu; + unsigned long i; + unsigned long long *delta = v; + + list_for_each_entry(kvm, &vm_list, vm_list) { + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); + if (i == 0) { + kvm->arch.epoch = vcpu->arch.sie_block->epoch; + kvm->arch.epdx = vcpu->arch.sie_block->epdx; + } + if (vcpu->arch.cputm_enabled) + vcpu->arch.cputm_start += *delta; + if (vcpu->arch.vsie_block) + kvm_clock_sync_scb(vcpu->arch.vsie_block, + *delta); + } + } + return NOTIFY_OK; +} + +static struct notifier_block kvm_clock_notifier = { + .notifier_call = kvm_clock_sync, +}; + +static void allow_cpu_feat(unsigned long nr) +{ + set_bit_inv(nr, kvm_s390_available_cpu_feat); +} + +static inline int plo_test_bit(unsigned char nr) +{ + unsigned long function = (unsigned long)nr | 0x100; + int cc; + + asm volatile( + " lgr 0,%[function]\n" + /* Parameter registers are ignored for "test bit" */ + " plo 0,0,0,0(0)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : [function] "d" (function) + : "cc", "0"); + return cc == 0; +} + +static __always_inline void __insn32_query(unsigned int opcode, u8 *query) +{ + asm volatile( + " lghi 0,0\n" + " lgr 1,%[query]\n" + /* Parameter registers are ignored */ + " .insn rrf,%[opc] << 16,2,4,6,0\n" + : + : [query] "d" ((unsigned long)query), [opc] "i" (opcode) + : "cc", "memory", "0", "1"); +} + +#define INSN_SORTL 0xb938 +#define INSN_DFLTCC 0xb939 + +static void __init kvm_s390_cpu_feat_init(void) +{ + int i; + + for (i = 0; i < 256; ++i) { + if (plo_test_bit(i)) + kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); + } + + if (test_facility(28)) /* TOD-clock steering */ + ptff(kvm_s390_available_subfunc.ptff, + sizeof(kvm_s390_available_subfunc.ptff), + PTFF_QAF); + + if (test_facility(17)) { /* MSA */ + __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) + kvm_s390_available_subfunc.kmac); + __cpacf_query(CPACF_KMC, (cpacf_mask_t *) + kvm_s390_available_subfunc.kmc); + __cpacf_query(CPACF_KM, (cpacf_mask_t *) + kvm_s390_available_subfunc.km); + __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) + kvm_s390_available_subfunc.kimd); + __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) + kvm_s390_available_subfunc.klmd); + } + if (test_facility(76)) /* MSA3 */ + __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) + kvm_s390_available_subfunc.pckmo); + if (test_facility(77)) { /* MSA4 */ + __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) + kvm_s390_available_subfunc.kmctr); + __cpacf_query(CPACF_KMF, (cpacf_mask_t *) + kvm_s390_available_subfunc.kmf); + __cpacf_query(CPACF_KMO, (cpacf_mask_t *) + kvm_s390_available_subfunc.kmo); + __cpacf_query(CPACF_PCC, (cpacf_mask_t *) + kvm_s390_available_subfunc.pcc); + } + if (test_facility(57)) /* MSA5 */ + __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) + kvm_s390_available_subfunc.ppno); + + if (test_facility(146)) /* MSA8 */ + __cpacf_query(CPACF_KMA, (cpacf_mask_t *) + kvm_s390_available_subfunc.kma); + + if (test_facility(155)) /* MSA9 */ + __cpacf_query(CPACF_KDSA, (cpacf_mask_t *) + kvm_s390_available_subfunc.kdsa); + + if (test_facility(150)) /* SORTL */ + __insn32_query(INSN_SORTL, kvm_s390_available_subfunc.sortl); + + if (test_facility(151)) /* DFLTCC */ + __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc); + + if (MACHINE_HAS_ESOP) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); + /* + * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), + * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). + */ + if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao || + !test_facility(3) || !nested) + return; + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); + if (sclp.has_64bscao) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); + if (sclp.has_siif) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); + if (sclp.has_gpere) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); + if (sclp.has_gsls) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); + if (sclp.has_ib) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); + if (sclp.has_cei) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); + if (sclp.has_ibs) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); + if (sclp.has_kss) + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); + /* + * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make + * all skey handling functions read/set the skey from the PGSTE + * instead of the real storage key. + * + * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make + * pages being detected as preserved although they are resident. + * + * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will + * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. + * + * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and + * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be + * correctly shadowed. We can do that for the PGSTE but not for PTE.I. + * + * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We + * cannot easily shadow the SCA because of the ipte lock. + */ +} + +static int __init __kvm_s390_init(void) +{ + int rc = -ENOMEM; + + kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); + if (!kvm_s390_dbf) + return -ENOMEM; + + kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long)); + if (!kvm_s390_dbf_uv) + goto err_kvm_uv; + + if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) || + debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view)) + goto err_debug_view; + + kvm_s390_cpu_feat_init(); + + /* Register floating interrupt controller interface. */ + rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); + if (rc) { + pr_err("A FLIC registration call failed with rc=%d\n", rc); + goto err_flic; + } + + if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { + rc = kvm_s390_pci_init(); + if (rc) { + pr_err("Unable to allocate AIFT for PCI\n"); + goto err_pci; + } + } + + rc = kvm_s390_gib_init(GAL_ISC); + if (rc) + goto err_gib; + + gmap_notifier.notifier_call = kvm_gmap_notifier; + gmap_register_pte_notifier(&gmap_notifier); + vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier; + gmap_register_pte_notifier(&vsie_gmap_notifier); + atomic_notifier_chain_register(&s390_epoch_delta_notifier, + &kvm_clock_notifier); + + return 0; + +err_gib: + if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) + kvm_s390_pci_exit(); +err_pci: +err_flic: +err_debug_view: + debug_unregister(kvm_s390_dbf_uv); +err_kvm_uv: + debug_unregister(kvm_s390_dbf); + return rc; +} + +static void __kvm_s390_exit(void) +{ + gmap_unregister_pte_notifier(&gmap_notifier); + gmap_unregister_pte_notifier(&vsie_gmap_notifier); + atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, + &kvm_clock_notifier); + + kvm_s390_gib_destroy(); + if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) + kvm_s390_pci_exit(); + debug_unregister(kvm_s390_dbf); + debug_unregister(kvm_s390_dbf_uv); +} + +/* Section: device related */ +long kvm_arch_dev_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + if (ioctl == KVM_S390_ENABLE_SIE) + return s390_enable_sie(); + return -EINVAL; +} + +int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) +{ + int r; + + switch (ext) { + case KVM_CAP_S390_PSW: + case KVM_CAP_S390_GMAP: + case KVM_CAP_SYNC_MMU: +#ifdef CONFIG_KVM_S390_UCONTROL + case KVM_CAP_S390_UCONTROL: +#endif + case KVM_CAP_ASYNC_PF: + case KVM_CAP_SYNC_REGS: + case KVM_CAP_ONE_REG: + case KVM_CAP_ENABLE_CAP: + case KVM_CAP_S390_CSS_SUPPORT: + case KVM_CAP_IOEVENTFD: + case KVM_CAP_DEVICE_CTRL: + case KVM_CAP_S390_IRQCHIP: + case KVM_CAP_VM_ATTRIBUTES: + case KVM_CAP_MP_STATE: + case KVM_CAP_IMMEDIATE_EXIT: + case KVM_CAP_S390_INJECT_IRQ: + case KVM_CAP_S390_USER_SIGP: + case KVM_CAP_S390_USER_STSI: + case KVM_CAP_S390_SKEYS: + case KVM_CAP_S390_IRQ_STATE: + case KVM_CAP_S390_USER_INSTR0: + case KVM_CAP_S390_CMMA_MIGRATION: + case KVM_CAP_S390_AIS: + case KVM_CAP_S390_AIS_MIGRATION: + case KVM_CAP_S390_VCPU_RESETS: + case KVM_CAP_SET_GUEST_DEBUG: + case KVM_CAP_S390_DIAG318: + case KVM_CAP_IRQFD_RESAMPLE: + r = 1; + break; + case KVM_CAP_SET_GUEST_DEBUG2: + r = KVM_GUESTDBG_VALID_MASK; + break; + case KVM_CAP_S390_HPAGE_1M: + r = 0; + if (hpage && !kvm_is_ucontrol(kvm)) + r = 1; + break; + case KVM_CAP_S390_MEM_OP: + r = MEM_OP_MAX_SIZE; + break; + case KVM_CAP_S390_MEM_OP_EXTENSION: + /* + * Flag bits indicating which extensions are supported. + * If r > 0, the base extension must also be supported/indicated, + * in order to maintain backwards compatibility. + */ + r = KVM_S390_MEMOP_EXTENSION_CAP_BASE | + KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG; + break; + case KVM_CAP_NR_VCPUS: + case KVM_CAP_MAX_VCPUS: + case KVM_CAP_MAX_VCPU_ID: + r = KVM_S390_BSCA_CPU_SLOTS; + if (!kvm_s390_use_sca_entries()) + r = KVM_MAX_VCPUS; + else if (sclp.has_esca && sclp.has_64bscao) + r = KVM_S390_ESCA_CPU_SLOTS; + if (ext == KVM_CAP_NR_VCPUS) + r = min_t(unsigned int, num_online_cpus(), r); + break; + case KVM_CAP_S390_COW: + r = MACHINE_HAS_ESOP; + break; + case KVM_CAP_S390_VECTOR_REGISTERS: + r = MACHINE_HAS_VX; + break; + case KVM_CAP_S390_RI: + r = test_facility(64); + break; + case KVM_CAP_S390_GS: + r = test_facility(133); + break; + case KVM_CAP_S390_BPB: + r = test_facility(82); + break; + case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE: + r = async_destroy && is_prot_virt_host(); + break; + case KVM_CAP_S390_PROTECTED: + r = is_prot_virt_host(); + break; + case KVM_CAP_S390_PROTECTED_DUMP: { + u64 pv_cmds_dump[] = { + BIT_UVC_CMD_DUMP_INIT, + BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE, + BIT_UVC_CMD_DUMP_CPU, + BIT_UVC_CMD_DUMP_COMPLETE, + }; + int i; + + r = is_prot_virt_host(); + + for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) { + if (!test_bit_inv(pv_cmds_dump[i], + (unsigned long *)&uv_info.inst_calls_list)) { + r = 0; + break; + } + } + break; + } + case KVM_CAP_S390_ZPCI_OP: + r = kvm_s390_pci_interp_allowed(); + break; + case KVM_CAP_S390_CPU_TOPOLOGY: + r = test_facility(11); + break; + default: + r = 0; + } + return r; +} + +void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) +{ + int i; + gfn_t cur_gfn, last_gfn; + unsigned long gaddr, vmaddr; + struct gmap *gmap = kvm->arch.gmap; + DECLARE_BITMAP(bitmap, _PAGE_ENTRIES); + + /* Loop over all guest segments */ + cur_gfn = memslot->base_gfn; + last_gfn = memslot->base_gfn + memslot->npages; + for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) { + gaddr = gfn_to_gpa(cur_gfn); + vmaddr = gfn_to_hva_memslot(memslot, cur_gfn); + if (kvm_is_error_hva(vmaddr)) + continue; + + bitmap_zero(bitmap, _PAGE_ENTRIES); + gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr); + for (i = 0; i < _PAGE_ENTRIES; i++) { + if (test_bit(i, bitmap)) + mark_page_dirty(kvm, cur_gfn + i); + } + + if (fatal_signal_pending(current)) + return; + cond_resched(); + } +} + +/* Section: vm related */ +static void sca_del_vcpu(struct kvm_vcpu *vcpu); + +/* + * Get (and clear) the dirty memory log for a memory slot. + */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, + struct kvm_dirty_log *log) +{ + int r; + unsigned long n; + struct kvm_memory_slot *memslot; + int is_dirty; + + if (kvm_is_ucontrol(kvm)) + return -EINVAL; + + mutex_lock(&kvm->slots_lock); + + r = -EINVAL; + if (log->slot >= KVM_USER_MEM_SLOTS) + goto out; + + r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot); + if (r) + goto out; + + /* Clear the dirty log */ + if (is_dirty) { + n = kvm_dirty_bitmap_bytes(memslot); + memset(memslot->dirty_bitmap, 0, n); + } + r = 0; +out: + mutex_unlock(&kvm->slots_lock); + return r; +} + +static void icpt_operexc_on_all_vcpus(struct kvm *kvm) +{ + unsigned long i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); + } +} + +int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) +{ + int r; + + if (cap->flags) + return -EINVAL; + + switch (cap->cap) { + case KVM_CAP_S390_IRQCHIP: + VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); + kvm->arch.use_irqchip = 1; + r = 0; + break; + case KVM_CAP_S390_USER_SIGP: + VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); + kvm->arch.user_sigp = 1; + r = 0; + break; + case KVM_CAP_S390_VECTOR_REGISTERS: + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + r = -EBUSY; + } else if (MACHINE_HAS_VX) { + set_kvm_facility(kvm->arch.model.fac_mask, 129); + set_kvm_facility(kvm->arch.model.fac_list, 129); + if (test_facility(134)) { + set_kvm_facility(kvm->arch.model.fac_mask, 134); + set_kvm_facility(kvm->arch.model.fac_list, 134); + } + if (test_facility(135)) { + set_kvm_facility(kvm->arch.model.fac_mask, 135); + set_kvm_facility(kvm->arch.model.fac_list, 135); + } + if (test_facility(148)) { + set_kvm_facility(kvm->arch.model.fac_mask, 148); + set_kvm_facility(kvm->arch.model.fac_list, 148); + } + if (test_facility(152)) { + set_kvm_facility(kvm->arch.model.fac_mask, 152); + set_kvm_facility(kvm->arch.model.fac_list, 152); + } + if (test_facility(192)) { + set_kvm_facility(kvm->arch.model.fac_mask, 192); + set_kvm_facility(kvm->arch.model.fac_list, 192); + } + r = 0; + } else + r = -EINVAL; + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", + r ? "(not available)" : "(success)"); + break; + case KVM_CAP_S390_RI: + r = -EINVAL; + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + r = -EBUSY; + } else if (test_facility(64)) { + set_kvm_facility(kvm->arch.model.fac_mask, 64); + set_kvm_facility(kvm->arch.model.fac_list, 64); + r = 0; + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", + r ? "(not available)" : "(success)"); + break; + case KVM_CAP_S390_AIS: + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + r = -EBUSY; + } else { + set_kvm_facility(kvm->arch.model.fac_mask, 72); + set_kvm_facility(kvm->arch.model.fac_list, 72); + r = 0; + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: AIS %s", + r ? "(not available)" : "(success)"); + break; + case KVM_CAP_S390_GS: + r = -EINVAL; + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + r = -EBUSY; + } else if (test_facility(133)) { + set_kvm_facility(kvm->arch.model.fac_mask, 133); + set_kvm_facility(kvm->arch.model.fac_list, 133); + r = 0; + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", + r ? "(not available)" : "(success)"); + break; + case KVM_CAP_S390_HPAGE_1M: + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) + r = -EBUSY; + else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) + r = -EINVAL; + else { + r = 0; + mmap_write_lock(kvm->mm); + kvm->mm->context.allow_gmap_hpage_1m = 1; + mmap_write_unlock(kvm->mm); + /* + * We might have to create fake 4k page + * tables. To avoid that the hardware works on + * stale PGSTEs, we emulate these instructions. + */ + kvm->arch.use_skf = 0; + kvm->arch.use_pfmfi = 0; + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", + r ? "(not available)" : "(success)"); + break; + case KVM_CAP_S390_USER_STSI: + VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); + kvm->arch.user_stsi = 1; + r = 0; + break; + case KVM_CAP_S390_USER_INSTR0: + VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); + kvm->arch.user_instr0 = 1; + icpt_operexc_on_all_vcpus(kvm); + r = 0; + break; + case KVM_CAP_S390_CPU_TOPOLOGY: + r = -EINVAL; + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + r = -EBUSY; + } else if (test_facility(11)) { + set_kvm_facility(kvm->arch.model.fac_mask, 11); + set_kvm_facility(kvm->arch.model.fac_list, 11); + r = 0; + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s", + r ? "(not available)" : "(success)"); + break; + default: + r = -EINVAL; + break; + } + return r; +} + +static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + switch (attr->attr) { + case KVM_S390_VM_MEM_LIMIT_SIZE: + ret = 0; + VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", + kvm->arch.mem_limit); + if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) + ret = -EFAULT; + break; + default: + ret = -ENXIO; + break; + } + return ret; +} + +static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + unsigned int idx; + switch (attr->attr) { + case KVM_S390_VM_MEM_ENABLE_CMMA: + ret = -ENXIO; + if (!sclp.has_cmma) + break; + + VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) + ret = -EBUSY; + else if (kvm->mm->context.allow_gmap_hpage_1m) + ret = -EINVAL; + else { + kvm->arch.use_cmma = 1; + /* Not compatible with cmma. */ + kvm->arch.use_pfmfi = 0; + ret = 0; + } + mutex_unlock(&kvm->lock); + break; + case KVM_S390_VM_MEM_CLR_CMMA: + ret = -ENXIO; + if (!sclp.has_cmma) + break; + ret = -EINVAL; + if (!kvm->arch.use_cmma) + break; + + VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); + mutex_lock(&kvm->lock); + idx = srcu_read_lock(&kvm->srcu); + s390_reset_cmma(kvm->arch.gmap->mm); + srcu_read_unlock(&kvm->srcu, idx); + mutex_unlock(&kvm->lock); + ret = 0; + break; + case KVM_S390_VM_MEM_LIMIT_SIZE: { + unsigned long new_limit; + + if (kvm_is_ucontrol(kvm)) + return -EINVAL; + + if (get_user(new_limit, (u64 __user *)attr->addr)) + return -EFAULT; + + if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && + new_limit > kvm->arch.mem_limit) + return -E2BIG; + + if (!new_limit) + return -EINVAL; + + /* gmap_create takes last usable address */ + if (new_limit != KVM_S390_NO_MEM_LIMIT) + new_limit -= 1; + + ret = -EBUSY; + mutex_lock(&kvm->lock); + if (!kvm->created_vcpus) { + /* gmap_create will round the limit up */ + struct gmap *new = gmap_create(current->mm, new_limit); + + if (!new) { + ret = -ENOMEM; + } else { + gmap_remove(kvm->arch.gmap); + new->private = kvm; + kvm->arch.gmap = new; + ret = 0; + } + } + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); + VM_EVENT(kvm, 3, "New guest asce: 0x%pK", + (void *) kvm->arch.gmap->asce); + break; + } + default: + ret = -ENXIO; + break; + } + return ret; +} + +static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); + +void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) +{ + struct kvm_vcpu *vcpu; + unsigned long i; + + kvm_s390_vcpu_block_all(kvm); + + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_s390_vcpu_crypto_setup(vcpu); + /* recreate the shadow crycb by leaving the VSIE handler */ + kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); + } + + kvm_s390_vcpu_unblock_all(kvm); +} + +static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) +{ + mutex_lock(&kvm->lock); + switch (attr->attr) { + case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); + return -EINVAL; + } + get_random_bytes( + kvm->arch.crypto.crycb->aes_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); + kvm->arch.crypto.aes_kw = 1; + VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); + break; + case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); + return -EINVAL; + } + get_random_bytes( + kvm->arch.crypto.crycb->dea_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); + kvm->arch.crypto.dea_kw = 1; + VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); + break; + case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); + return -EINVAL; + } + kvm->arch.crypto.aes_kw = 0; + memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, + sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); + VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); + break; + case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); + return -EINVAL; + } + kvm->arch.crypto.dea_kw = 0; + memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, + sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); + VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); + break; + case KVM_S390_VM_CRYPTO_ENABLE_APIE: + if (!ap_instructions_available()) { + mutex_unlock(&kvm->lock); + return -EOPNOTSUPP; + } + kvm->arch.crypto.apie = 1; + break; + case KVM_S390_VM_CRYPTO_DISABLE_APIE: + if (!ap_instructions_available()) { + mutex_unlock(&kvm->lock); + return -EOPNOTSUPP; + } + kvm->arch.crypto.apie = 0; + break; + default: + mutex_unlock(&kvm->lock); + return -ENXIO; + } + + kvm_s390_vcpu_crypto_reset_all(kvm); + mutex_unlock(&kvm->lock); + return 0; +} + +static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu) +{ + /* Only set the ECB bits after guest requests zPCI interpretation */ + if (!vcpu->kvm->arch.use_zpci_interp) + return; + + vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI; + vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI; +} + +void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm) +{ + struct kvm_vcpu *vcpu; + unsigned long i; + + lockdep_assert_held(&kvm->lock); + + if (!kvm_s390_pci_interp_allowed()) + return; + + /* + * If host is configured for PCI and the necessary facilities are + * available, turn on interpretation for the life of this guest + */ + kvm->arch.use_zpci_interp = 1; + + kvm_s390_vcpu_block_all(kvm); + + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_s390_vcpu_pci_setup(vcpu); + kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); + } + + kvm_s390_vcpu_unblock_all(kvm); +} + +static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) +{ + unsigned long cx; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(cx, vcpu, kvm) + kvm_s390_sync_request(req, vcpu); +} + +/* + * Must be called with kvm->srcu held to avoid races on memslots, and with + * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration. + */ +static int kvm_s390_vm_start_migration(struct kvm *kvm) +{ + struct kvm_memory_slot *ms; + struct kvm_memslots *slots; + unsigned long ram_pages = 0; + int bkt; + + /* migration mode already enabled */ + if (kvm->arch.migration_mode) + return 0; + slots = kvm_memslots(kvm); + if (!slots || kvm_memslots_empty(slots)) + return -EINVAL; + + if (!kvm->arch.use_cmma) { + kvm->arch.migration_mode = 1; + return 0; + } + /* mark all the pages in active slots as dirty */ + kvm_for_each_memslot(ms, bkt, slots) { + if (!ms->dirty_bitmap) + return -EINVAL; + /* + * The second half of the bitmap is only used on x86, + * and would be wasted otherwise, so we put it to good + * use here to keep track of the state of the storage + * attributes. + */ + memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms)); + ram_pages += ms->npages; + } + atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages); + kvm->arch.migration_mode = 1; + kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); + return 0; +} + +/* + * Must be called with kvm->slots_lock to avoid races with ourselves and + * kvm_s390_vm_start_migration. + */ +static int kvm_s390_vm_stop_migration(struct kvm *kvm) +{ + /* migration mode already disabled */ + if (!kvm->arch.migration_mode) + return 0; + kvm->arch.migration_mode = 0; + if (kvm->arch.use_cmma) + kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); + return 0; +} + +static int kvm_s390_vm_set_migration(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + int res = -ENXIO; + + mutex_lock(&kvm->slots_lock); + switch (attr->attr) { + case KVM_S390_VM_MIGRATION_START: + res = kvm_s390_vm_start_migration(kvm); + break; + case KVM_S390_VM_MIGRATION_STOP: + res = kvm_s390_vm_stop_migration(kvm); + break; + default: + break; + } + mutex_unlock(&kvm->slots_lock); + + return res; +} + +static int kvm_s390_vm_get_migration(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + u64 mig = kvm->arch.migration_mode; + + if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) + return -ENXIO; + + if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) + return -EFAULT; + return 0; +} + +static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); + +static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_tod_clock gtod; + + if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) + return -EFAULT; + + if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) + return -EINVAL; + __kvm_s390_set_tod_clock(kvm, >od); + + VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", + gtod.epoch_idx, gtod.tod); + + return 0; +} + +static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u8 gtod_high; + + if (copy_from_user(>od_high, (void __user *)attr->addr, + sizeof(gtod_high))) + return -EFAULT; + + if (gtod_high != 0) + return -EINVAL; + VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); + + return 0; +} + +static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_tod_clock gtod = { 0 }; + + if (copy_from_user(>od.tod, (void __user *)attr->addr, + sizeof(gtod.tod))) + return -EFAULT; + + __kvm_s390_set_tod_clock(kvm, >od); + VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); + return 0; +} + +static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + if (attr->flags) + return -EINVAL; + + mutex_lock(&kvm->lock); + /* + * For protected guests, the TOD is managed by the ultravisor, so trying + * to change it will never bring the expected results. + */ + if (kvm_s390_pv_is_protected(kvm)) { + ret = -EOPNOTSUPP; + goto out_unlock; + } + + switch (attr->attr) { + case KVM_S390_VM_TOD_EXT: + ret = kvm_s390_set_tod_ext(kvm, attr); + break; + case KVM_S390_VM_TOD_HIGH: + ret = kvm_s390_set_tod_high(kvm, attr); + break; + case KVM_S390_VM_TOD_LOW: + ret = kvm_s390_set_tod_low(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + +out_unlock: + mutex_unlock(&kvm->lock); + return ret; +} + +static void kvm_s390_get_tod_clock(struct kvm *kvm, + struct kvm_s390_vm_tod_clock *gtod) +{ + union tod_clock clk; + + preempt_disable(); + + store_tod_clock_ext(&clk); + + gtod->tod = clk.tod + kvm->arch.epoch; + gtod->epoch_idx = 0; + if (test_kvm_facility(kvm, 139)) { + gtod->epoch_idx = clk.ei + kvm->arch.epdx; + if (gtod->tod < clk.tod) + gtod->epoch_idx += 1; + } + + preempt_enable(); +} + +static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_tod_clock gtod; + + memset(>od, 0, sizeof(gtod)); + kvm_s390_get_tod_clock(kvm, >od); + if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) + return -EFAULT; + + VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", + gtod.epoch_idx, gtod.tod); + return 0; +} + +static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u8 gtod_high = 0; + + if (copy_to_user((void __user *)attr->addr, >od_high, + sizeof(gtod_high))) + return -EFAULT; + VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); + + return 0; +} + +static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u64 gtod; + + gtod = kvm_s390_get_tod_clock_fast(kvm); + if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) + return -EFAULT; + VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); + + return 0; +} + +static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + if (attr->flags) + return -EINVAL; + + switch (attr->attr) { + case KVM_S390_VM_TOD_EXT: + ret = kvm_s390_get_tod_ext(kvm, attr); + break; + case KVM_S390_VM_TOD_HIGH: + ret = kvm_s390_get_tod_high(kvm, attr); + break; + case KVM_S390_VM_TOD_LOW: + ret = kvm_s390_get_tod_low(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + return ret; +} + +static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_processor *proc; + u16 lowest_ibc, unblocked_ibc; + int ret = 0; + + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + ret = -EBUSY; + goto out; + } + proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT); + if (!proc) { + ret = -ENOMEM; + goto out; + } + if (!copy_from_user(proc, (void __user *)attr->addr, + sizeof(*proc))) { + kvm->arch.model.cpuid = proc->cpuid; + lowest_ibc = sclp.ibc >> 16 & 0xfff; + unblocked_ibc = sclp.ibc & 0xfff; + if (lowest_ibc && proc->ibc) { + if (proc->ibc > unblocked_ibc) + kvm->arch.model.ibc = unblocked_ibc; + else if (proc->ibc < lowest_ibc) + kvm->arch.model.ibc = lowest_ibc; + else + kvm->arch.model.ibc = proc->ibc; + } + memcpy(kvm->arch.model.fac_list, proc->fac_list, + S390_ARCH_FAC_LIST_SIZE_BYTE); + VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", + kvm->arch.model.ibc, + kvm->arch.model.cpuid); + VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", + kvm->arch.model.fac_list[0], + kvm->arch.model.fac_list[1], + kvm->arch.model.fac_list[2]); + } else + ret = -EFAULT; + kfree(proc); +out: + mutex_unlock(&kvm->lock); + return ret; +} + +static int kvm_s390_set_processor_feat(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_feat data; + + if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) + return -EFAULT; + if (!bitmap_subset((unsigned long *) data.feat, + kvm_s390_available_cpu_feat, + KVM_S390_VM_CPU_FEAT_NR_BITS)) + return -EINVAL; + + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + mutex_unlock(&kvm->lock); + return -EBUSY; + } + bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS); + mutex_unlock(&kvm->lock); + VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", + data.feat[0], + data.feat[1], + data.feat[2]); + return 0; +} + +static int kvm_s390_set_processor_subfunc(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + mutex_unlock(&kvm->lock); + return -EBUSY; + } + + if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, + sizeof(struct kvm_s390_vm_cpu_subfunc))) { + mutex_unlock(&kvm->lock); + return -EFAULT; + } + mutex_unlock(&kvm->lock); + + VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); + VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); + VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); + VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); + VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); + VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); + VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); + VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); + VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); + VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); + VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); + VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); + VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); + VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); + VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); + VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); + VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); + + return 0; +} + +#define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK \ +( \ + ((struct kvm_s390_vm_cpu_uv_feat){ \ + .ap = 1, \ + .ap_intr = 1, \ + }) \ + .feat \ +) + +static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr; + unsigned long data, filter; + + filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; + if (get_user(data, &ptr->feat)) + return -EFAULT; + if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS)) + return -EINVAL; + + mutex_lock(&kvm->lock); + if (kvm->created_vcpus) { + mutex_unlock(&kvm->lock); + return -EBUSY; + } + kvm->arch.model.uv_feat_guest.feat = data; + mutex_unlock(&kvm->lock); + + VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data); + + return 0; +} + +static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->attr) { + case KVM_S390_VM_CPU_PROCESSOR: + ret = kvm_s390_set_processor(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_FEAT: + ret = kvm_s390_set_processor_feat(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: + ret = kvm_s390_set_processor_subfunc(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: + ret = kvm_s390_set_uv_feat(kvm, attr); + break; + } + return ret; +} + +static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_processor *proc; + int ret = 0; + + proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT); + if (!proc) { + ret = -ENOMEM; + goto out; + } + proc->cpuid = kvm->arch.model.cpuid; + proc->ibc = kvm->arch.model.ibc; + memcpy(&proc->fac_list, kvm->arch.model.fac_list, + S390_ARCH_FAC_LIST_SIZE_BYTE); + VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", + kvm->arch.model.ibc, + kvm->arch.model.cpuid); + VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", + kvm->arch.model.fac_list[0], + kvm->arch.model.fac_list[1], + kvm->arch.model.fac_list[2]); + if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) + ret = -EFAULT; + kfree(proc); +out: + return ret; +} + +static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_machine *mach; + int ret = 0; + + mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT); + if (!mach) { + ret = -ENOMEM; + goto out; + } + get_cpu_id((struct cpuid *) &mach->cpuid); + mach->ibc = sclp.ibc; + memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, + S390_ARCH_FAC_LIST_SIZE_BYTE); + memcpy((unsigned long *)&mach->fac_list, stfle_fac_list, + sizeof(stfle_fac_list)); + VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", + kvm->arch.model.ibc, + kvm->arch.model.cpuid); + VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", + mach->fac_mask[0], + mach->fac_mask[1], + mach->fac_mask[2]); + VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", + mach->fac_list[0], + mach->fac_list[1], + mach->fac_list[2]); + if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) + ret = -EFAULT; + kfree(mach); +out: + return ret; +} + +static int kvm_s390_get_processor_feat(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_feat data; + + bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); + if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) + return -EFAULT; + VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", + data.feat[0], + data.feat[1], + data.feat[2]); + return 0; +} + +static int kvm_s390_get_machine_feat(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_feat data; + + bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); + if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) + return -EFAULT; + VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", + data.feat[0], + data.feat[1], + data.feat[2]); + return 0; +} + +static int kvm_s390_get_processor_subfunc(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, + sizeof(struct kvm_s390_vm_cpu_subfunc))) + return -EFAULT; + + VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); + VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); + VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); + VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); + VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); + VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); + VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); + VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); + VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); + VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); + VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); + VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); + VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); + VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); + VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); + VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); + VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], + ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); + + return 0; +} + +static int kvm_s390_get_machine_subfunc(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, + sizeof(struct kvm_s390_vm_cpu_subfunc))) + return -EFAULT; + + VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], + ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], + ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], + ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); + VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], + ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); + VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); + VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); + VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.km)[0], + ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); + VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); + VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], + ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); + VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], + ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); + VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); + VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); + VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); + VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], + ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); + VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], + ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); + VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); + VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0], + ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]); + VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0], + ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1], + ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2], + ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]); + VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", + ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0], + ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1], + ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2], + ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]); + + return 0; +} + +static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; + unsigned long feat = kvm->arch.model.uv_feat_guest.feat; + + if (put_user(feat, &dst->feat)) + return -EFAULT; + VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); + + return 0; +} + +static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; + unsigned long feat; + + BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications)); + + feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; + if (put_user(feat, &dst->feat)) + return -EFAULT; + VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); + + return 0; +} + +static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->attr) { + case KVM_S390_VM_CPU_PROCESSOR: + ret = kvm_s390_get_processor(kvm, attr); + break; + case KVM_S390_VM_CPU_MACHINE: + ret = kvm_s390_get_machine(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_FEAT: + ret = kvm_s390_get_processor_feat(kvm, attr); + break; + case KVM_S390_VM_CPU_MACHINE_FEAT: + ret = kvm_s390_get_machine_feat(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: + ret = kvm_s390_get_processor_subfunc(kvm, attr); + break; + case KVM_S390_VM_CPU_MACHINE_SUBFUNC: + ret = kvm_s390_get_machine_subfunc(kvm, attr); + break; + case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: + ret = kvm_s390_get_processor_uv_feat(kvm, attr); + break; + case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: + ret = kvm_s390_get_machine_uv_feat(kvm, attr); + break; + } + return ret; +} + +/** + * kvm_s390_update_topology_change_report - update CPU topology change report + * @kvm: guest KVM description + * @val: set or clear the MTCR bit + * + * Updates the Multiprocessor Topology-Change-Report bit to signal + * the guest with a topology change. + * This is only relevant if the topology facility is present. + * + * The SCA version, bsca or esca, doesn't matter as offset is the same. + */ +static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val) +{ + union sca_utility new, old; + struct bsca_block *sca; + + read_lock(&kvm->arch.sca_lock); + sca = kvm->arch.sca; + do { + old = READ_ONCE(sca->utility); + new = old; + new.mtcr = val; + } while (cmpxchg(&sca->utility.val, old.val, new.val) != old.val); + read_unlock(&kvm->arch.sca_lock); +} + +static int kvm_s390_set_topo_change_indication(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + if (!test_kvm_facility(kvm, 11)) + return -ENXIO; + + kvm_s390_update_topology_change_report(kvm, !!attr->attr); + return 0; +} + +static int kvm_s390_get_topo_change_indication(struct kvm *kvm, + struct kvm_device_attr *attr) +{ + u8 topo; + + if (!test_kvm_facility(kvm, 11)) + return -ENXIO; + + read_lock(&kvm->arch.sca_lock); + topo = ((struct bsca_block *)kvm->arch.sca)->utility.mtcr; + read_unlock(&kvm->arch.sca_lock); + + return put_user(topo, (u8 __user *)attr->addr); +} + +static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + switch (attr->group) { + case KVM_S390_VM_MEM_CTRL: + ret = kvm_s390_set_mem_control(kvm, attr); + break; + case KVM_S390_VM_TOD: + ret = kvm_s390_set_tod(kvm, attr); + break; + case KVM_S390_VM_CPU_MODEL: + ret = kvm_s390_set_cpu_model(kvm, attr); + break; + case KVM_S390_VM_CRYPTO: + ret = kvm_s390_vm_set_crypto(kvm, attr); + break; + case KVM_S390_VM_MIGRATION: + ret = kvm_s390_vm_set_migration(kvm, attr); + break; + case KVM_S390_VM_CPU_TOPOLOGY: + ret = kvm_s390_set_topo_change_indication(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + + return ret; +} + +static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + switch (attr->group) { + case KVM_S390_VM_MEM_CTRL: + ret = kvm_s390_get_mem_control(kvm, attr); + break; + case KVM_S390_VM_TOD: + ret = kvm_s390_get_tod(kvm, attr); + break; + case KVM_S390_VM_CPU_MODEL: + ret = kvm_s390_get_cpu_model(kvm, attr); + break; + case KVM_S390_VM_MIGRATION: + ret = kvm_s390_vm_get_migration(kvm, attr); + break; + case KVM_S390_VM_CPU_TOPOLOGY: + ret = kvm_s390_get_topo_change_indication(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + + return ret; +} + +static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + switch (attr->group) { + case KVM_S390_VM_MEM_CTRL: + switch (attr->attr) { + case KVM_S390_VM_MEM_ENABLE_CMMA: + case KVM_S390_VM_MEM_CLR_CMMA: + ret = sclp.has_cmma ? 0 : -ENXIO; + break; + case KVM_S390_VM_MEM_LIMIT_SIZE: + ret = 0; + break; + default: + ret = -ENXIO; + break; + } + break; + case KVM_S390_VM_TOD: + switch (attr->attr) { + case KVM_S390_VM_TOD_LOW: + case KVM_S390_VM_TOD_HIGH: + ret = 0; + break; + default: + ret = -ENXIO; + break; + } + break; + case KVM_S390_VM_CPU_MODEL: + switch (attr->attr) { + case KVM_S390_VM_CPU_PROCESSOR: + case KVM_S390_VM_CPU_MACHINE: + case KVM_S390_VM_CPU_PROCESSOR_FEAT: + case KVM_S390_VM_CPU_MACHINE_FEAT: + case KVM_S390_VM_CPU_MACHINE_SUBFUNC: + case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: + case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: + case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: + ret = 0; + break; + default: + ret = -ENXIO; + break; + } + break; + case KVM_S390_VM_CRYPTO: + switch (attr->attr) { + case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: + case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: + case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: + case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: + ret = 0; + break; + case KVM_S390_VM_CRYPTO_ENABLE_APIE: + case KVM_S390_VM_CRYPTO_DISABLE_APIE: + ret = ap_instructions_available() ? 0 : -ENXIO; + break; + default: + ret = -ENXIO; + break; + } + break; + case KVM_S390_VM_MIGRATION: + ret = 0; + break; + case KVM_S390_VM_CPU_TOPOLOGY: + ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO; + break; + default: + ret = -ENXIO; + break; + } + + return ret; +} + +static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) +{ + uint8_t *keys; + uint64_t hva; + int srcu_idx, i, r = 0; + + if (args->flags != 0) + return -EINVAL; + + /* Is this guest using storage keys? */ + if (!mm_uses_skeys(current->mm)) + return KVM_S390_GET_SKEYS_NONE; + + /* Enforce sane limit on memory allocation */ + if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) + return -EINVAL; + + keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT); + if (!keys) + return -ENOMEM; + + mmap_read_lock(current->mm); + srcu_idx = srcu_read_lock(&kvm->srcu); + for (i = 0; i < args->count; i++) { + hva = gfn_to_hva(kvm, args->start_gfn + i); + if (kvm_is_error_hva(hva)) { + r = -EFAULT; + break; + } + + r = get_guest_storage_key(current->mm, hva, &keys[i]); + if (r) + break; + } + srcu_read_unlock(&kvm->srcu, srcu_idx); + mmap_read_unlock(current->mm); + + if (!r) { + r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, + sizeof(uint8_t) * args->count); + if (r) + r = -EFAULT; + } + + kvfree(keys); + return r; +} + +static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) +{ + uint8_t *keys; + uint64_t hva; + int srcu_idx, i, r = 0; + bool unlocked; + + if (args->flags != 0) + return -EINVAL; + + /* Enforce sane limit on memory allocation */ + if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) + return -EINVAL; + + keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT); + if (!keys) + return -ENOMEM; + + r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, + sizeof(uint8_t) * args->count); + if (r) { + r = -EFAULT; + goto out; + } + + /* Enable storage key handling for the guest */ + r = s390_enable_skey(); + if (r) + goto out; + + i = 0; + mmap_read_lock(current->mm); + srcu_idx = srcu_read_lock(&kvm->srcu); + while (i < args->count) { + unlocked = false; + hva = gfn_to_hva(kvm, args->start_gfn + i); + if (kvm_is_error_hva(hva)) { + r = -EFAULT; + break; + } + + /* Lowest order bit is reserved */ + if (keys[i] & 0x01) { + r = -EINVAL; + break; + } + + r = set_guest_storage_key(current->mm, hva, keys[i], 0); + if (r) { + r = fixup_user_fault(current->mm, hva, + FAULT_FLAG_WRITE, &unlocked); + if (r) + break; + } + if (!r) + i++; + } + srcu_read_unlock(&kvm->srcu, srcu_idx); + mmap_read_unlock(current->mm); +out: + kvfree(keys); + return r; +} + +/* + * Base address and length must be sent at the start of each block, therefore + * it's cheaper to send some clean data, as long as it's less than the size of + * two longs. + */ +#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *)) +/* for consistency */ +#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX) + +static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, + u8 *res, unsigned long bufsize) +{ + unsigned long pgstev, hva, cur_gfn = args->start_gfn; + + args->count = 0; + while (args->count < bufsize) { + hva = gfn_to_hva(kvm, cur_gfn); + /* + * We return an error if the first value was invalid, but we + * return successfully if at least one value was copied. + */ + if (kvm_is_error_hva(hva)) + return args->count ? 0 : -EFAULT; + if (get_pgste(kvm->mm, hva, &pgstev) < 0) + pgstev = 0; + res[args->count++] = (pgstev >> 24) & 0x43; + cur_gfn++; + } + + return 0; +} + +static struct kvm_memory_slot *gfn_to_memslot_approx(struct kvm_memslots *slots, + gfn_t gfn) +{ + return ____gfn_to_memslot(slots, gfn, true); +} + +static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots, + unsigned long cur_gfn) +{ + struct kvm_memory_slot *ms = gfn_to_memslot_approx(slots, cur_gfn); + unsigned long ofs = cur_gfn - ms->base_gfn; + struct rb_node *mnode = &ms->gfn_node[slots->node_idx]; + + if (ms->base_gfn + ms->npages <= cur_gfn) { + mnode = rb_next(mnode); + /* If we are above the highest slot, wrap around */ + if (!mnode) + mnode = rb_first(&slots->gfn_tree); + + ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]); + ofs = 0; + } + + if (cur_gfn < ms->base_gfn) + ofs = 0; + + ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs); + while (ofs >= ms->npages && (mnode = rb_next(mnode))) { + ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]); + ofs = find_first_bit(kvm_second_dirty_bitmap(ms), ms->npages); + } + return ms->base_gfn + ofs; +} + +static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, + u8 *res, unsigned long bufsize) +{ + unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev; + struct kvm_memslots *slots = kvm_memslots(kvm); + struct kvm_memory_slot *ms; + + if (unlikely(kvm_memslots_empty(slots))) + return 0; + + cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn); + ms = gfn_to_memslot(kvm, cur_gfn); + args->count = 0; + args->start_gfn = cur_gfn; + if (!ms) + return 0; + next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); + mem_end = kvm_s390_get_gfn_end(slots); + + while (args->count < bufsize) { + hva = gfn_to_hva(kvm, cur_gfn); + if (kvm_is_error_hva(hva)) + return 0; + /* Decrement only if we actually flipped the bit to 0 */ + if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) + atomic64_dec(&kvm->arch.cmma_dirty_pages); + if (get_pgste(kvm->mm, hva, &pgstev) < 0) + pgstev = 0; + /* Save the value */ + res[args->count++] = (pgstev >> 24) & 0x43; + /* If the next bit is too far away, stop. */ + if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE) + return 0; + /* If we reached the previous "next", find the next one */ + if (cur_gfn == next_gfn) + next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); + /* Reached the end of memory or of the buffer, stop */ + if ((next_gfn >= mem_end) || + (next_gfn - args->start_gfn >= bufsize)) + return 0; + cur_gfn++; + /* Reached the end of the current memslot, take the next one. */ + if (cur_gfn - ms->base_gfn >= ms->npages) { + ms = gfn_to_memslot(kvm, cur_gfn); + if (!ms) + return 0; + } + } + return 0; +} + +/* + * This function searches for the next page with dirty CMMA attributes, and + * saves the attributes in the buffer up to either the end of the buffer or + * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; + * no trailing clean bytes are saved. + * In case no dirty bits were found, or if CMMA was not enabled or used, the + * output buffer will indicate 0 as length. + */ +static int kvm_s390_get_cmma_bits(struct kvm *kvm, + struct kvm_s390_cmma_log *args) +{ + unsigned long bufsize; + int srcu_idx, peek, ret; + u8 *values; + + if (!kvm->arch.use_cmma) + return -ENXIO; + /* Invalid/unsupported flags were specified */ + if (args->flags & ~KVM_S390_CMMA_PEEK) + return -EINVAL; + /* Migration mode query, and we are not doing a migration */ + peek = !!(args->flags & KVM_S390_CMMA_PEEK); + if (!peek && !kvm->arch.migration_mode) + return -EINVAL; + /* CMMA is disabled or was not used, or the buffer has length zero */ + bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX); + if (!bufsize || !kvm->mm->context.uses_cmm) { + memset(args, 0, sizeof(*args)); + return 0; + } + /* We are not peeking, and there are no dirty pages */ + if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { + memset(args, 0, sizeof(*args)); + return 0; + } + + values = vmalloc(bufsize); + if (!values) + return -ENOMEM; + + mmap_read_lock(kvm->mm); + srcu_idx = srcu_read_lock(&kvm->srcu); + if (peek) + ret = kvm_s390_peek_cmma(kvm, args, values, bufsize); + else + ret = kvm_s390_get_cmma(kvm, args, values, bufsize); + srcu_read_unlock(&kvm->srcu, srcu_idx); + mmap_read_unlock(kvm->mm); + + if (kvm->arch.migration_mode) + args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); + else + args->remaining = 0; + + if (copy_to_user((void __user *)args->values, values, args->count)) + ret = -EFAULT; + + vfree(values); + return ret; +} + +/* + * This function sets the CMMA attributes for the given pages. If the input + * buffer has zero length, no action is taken, otherwise the attributes are + * set and the mm->context.uses_cmm flag is set. + */ +static int kvm_s390_set_cmma_bits(struct kvm *kvm, + const struct kvm_s390_cmma_log *args) +{ + unsigned long hva, mask, pgstev, i; + uint8_t *bits; + int srcu_idx, r = 0; + + mask = args->mask; + + if (!kvm->arch.use_cmma) + return -ENXIO; + /* invalid/unsupported flags */ + if (args->flags != 0) + return -EINVAL; + /* Enforce sane limit on memory allocation */ + if (args->count > KVM_S390_CMMA_SIZE_MAX) + return -EINVAL; + /* Nothing to do */ + if (args->count == 0) + return 0; + + bits = vmalloc(array_size(sizeof(*bits), args->count)); + if (!bits) + return -ENOMEM; + + r = copy_from_user(bits, (void __user *)args->values, args->count); + if (r) { + r = -EFAULT; + goto out; + } + + mmap_read_lock(kvm->mm); + srcu_idx = srcu_read_lock(&kvm->srcu); + for (i = 0; i < args->count; i++) { + hva = gfn_to_hva(kvm, args->start_gfn + i); + if (kvm_is_error_hva(hva)) { + r = -EFAULT; + break; + } + + pgstev = bits[i]; + pgstev = pgstev << 24; + mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT; + set_pgste_bits(kvm->mm, hva, mask, pgstev); + } + srcu_read_unlock(&kvm->srcu, srcu_idx); + mmap_read_unlock(kvm->mm); + + if (!kvm->mm->context.uses_cmm) { + mmap_write_lock(kvm->mm); + kvm->mm->context.uses_cmm = 1; + mmap_write_unlock(kvm->mm); + } +out: + vfree(bits); + return r; +} + +/** + * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to + * non protected. + * @kvm: the VM whose protected vCPUs are to be converted + * @rc: return value for the RC field of the UVC (in case of error) + * @rrc: return value for the RRC field of the UVC (in case of error) + * + * Does not stop in case of error, tries to convert as many + * CPUs as possible. In case of error, the RC and RRC of the last error are + * returned. + * + * Return: 0 in case of success, otherwise -EIO + */ +int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + struct kvm_vcpu *vcpu; + unsigned long i; + u16 _rc, _rrc; + int ret = 0; + + /* + * We ignore failures and try to destroy as many CPUs as possible. + * At the same time we must not free the assigned resources when + * this fails, as the ultravisor has still access to that memory. + * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak + * behind. + * We want to return the first failure rc and rrc, though. + */ + kvm_for_each_vcpu(i, vcpu, kvm) { + mutex_lock(&vcpu->mutex); + if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) { + *rc = _rc; + *rrc = _rrc; + ret = -EIO; + } + mutex_unlock(&vcpu->mutex); + } + /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */ + if (use_gisa) + kvm_s390_gisa_enable(kvm); + return ret; +} + +/** + * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM + * to protected. + * @kvm: the VM whose protected vCPUs are to be converted + * @rc: return value for the RC field of the UVC (in case of error) + * @rrc: return value for the RRC field of the UVC (in case of error) + * + * Tries to undo the conversion in case of error. + * + * Return: 0 in case of success, otherwise -EIO + */ +static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + unsigned long i; + int r = 0; + u16 dummy; + + struct kvm_vcpu *vcpu; + + /* Disable the GISA if the ultravisor does not support AIV. */ + if (!uv_has_feature(BIT_UV_FEAT_AIV)) + kvm_s390_gisa_disable(kvm); + + kvm_for_each_vcpu(i, vcpu, kvm) { + mutex_lock(&vcpu->mutex); + r = kvm_s390_pv_create_cpu(vcpu, rc, rrc); + mutex_unlock(&vcpu->mutex); + if (r) + break; + } + if (r) + kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); + return r; +} + +/* + * Here we provide user space with a direct interface to query UV + * related data like UV maxima and available features as well as + * feature specific data. + * + * To facilitate future extension of the data structures we'll try to + * write data up to the maximum requested length. + */ +static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info) +{ + ssize_t len_min; + + switch (info->header.id) { + case KVM_PV_INFO_VM: { + len_min = sizeof(info->header) + sizeof(info->vm); + + if (info->header.len_max < len_min) + return -EINVAL; + + memcpy(info->vm.inst_calls_list, + uv_info.inst_calls_list, + sizeof(uv_info.inst_calls_list)); + + /* It's max cpuid not max cpus, so it's off by one */ + info->vm.max_cpus = uv_info.max_guest_cpu_id + 1; + info->vm.max_guests = uv_info.max_num_sec_conf; + info->vm.max_guest_addr = uv_info.max_sec_stor_addr; + info->vm.feature_indication = uv_info.uv_feature_indications; + + return len_min; + } + case KVM_PV_INFO_DUMP: { + len_min = sizeof(info->header) + sizeof(info->dump); + + if (info->header.len_max < len_min) + return -EINVAL; + + info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len; + info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len; + info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len; + return len_min; + } + default: + return -EINVAL; + } +} + +static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd, + struct kvm_s390_pv_dmp dmp) +{ + int r = -EINVAL; + void __user *result_buff = (void __user *)dmp.buff_addr; + + switch (dmp.subcmd) { + case KVM_PV_DUMP_INIT: { + if (kvm->arch.pv.dumping) + break; + + /* + * Block SIE entry as concurrent dump UVCs could lead + * to validities. + */ + kvm_s390_vcpu_block_all(kvm); + + r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), + UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc); + KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x", + cmd->rc, cmd->rrc); + if (!r) { + kvm->arch.pv.dumping = true; + } else { + kvm_s390_vcpu_unblock_all(kvm); + r = -EINVAL; + } + break; + } + case KVM_PV_DUMP_CONFIG_STOR_STATE: { + if (!kvm->arch.pv.dumping) + break; + + /* + * gaddr is an output parameter since we might stop + * early. As dmp will be copied back in our caller, we + * don't need to do it ourselves. + */ + r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len, + &cmd->rc, &cmd->rrc); + break; + } + case KVM_PV_DUMP_COMPLETE: { + if (!kvm->arch.pv.dumping) + break; + + r = -EINVAL; + if (dmp.buff_len < uv_info.conf_dump_finalize_len) + break; + + r = kvm_s390_pv_dump_complete(kvm, result_buff, + &cmd->rc, &cmd->rrc); + break; + } + default: + r = -ENOTTY; + break; + } + + return r; +} + +static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) +{ + const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM); + void __user *argp = (void __user *)cmd->data; + int r = 0; + u16 dummy; + + if (need_lock) + mutex_lock(&kvm->lock); + + switch (cmd->cmd) { + case KVM_PV_ENABLE: { + r = -EINVAL; + if (kvm_s390_pv_is_protected(kvm)) + break; + + /* + * FMT 4 SIE needs esca. As we never switch back to bsca from + * esca, we need no cleanup in the error cases below + */ + r = sca_switch_to_extended(kvm); + if (r) + break; + + mmap_write_lock(current->mm); + r = gmap_mark_unmergeable(); + mmap_write_unlock(current->mm); + if (r) + break; + + r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc); + if (r) + break; + + r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc); + if (r) + kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy); + + /* we need to block service interrupts from now on */ + set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); + break; + } + case KVM_PV_ASYNC_CLEANUP_PREPARE: + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm) || !async_destroy) + break; + + r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); + /* + * If a CPU could not be destroyed, destroy VM will also fail. + * There is no point in trying to destroy it. Instead return + * the rc and rrc from the first CPU that failed destroying. + */ + if (r) + break; + r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc); + + /* no need to block service interrupts any more */ + clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); + break; + case KVM_PV_ASYNC_CLEANUP_PERFORM: + r = -EINVAL; + if (!async_destroy) + break; + /* kvm->lock must not be held; this is asserted inside the function. */ + r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc); + break; + case KVM_PV_DISABLE: { + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); + /* + * If a CPU could not be destroyed, destroy VM will also fail. + * There is no point in trying to destroy it. Instead return + * the rc and rrc from the first CPU that failed destroying. + */ + if (r) + break; + r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc); + + /* no need to block service interrupts any more */ + clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); + break; + } + case KVM_PV_SET_SEC_PARMS: { + struct kvm_s390_pv_sec_parm parms = {}; + void *hdr; + + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = -EFAULT; + if (copy_from_user(&parms, argp, sizeof(parms))) + break; + + /* Currently restricted to 8KB */ + r = -EINVAL; + if (parms.length > PAGE_SIZE * 2) + break; + + r = -ENOMEM; + hdr = vmalloc(parms.length); + if (!hdr) + break; + + r = -EFAULT; + if (!copy_from_user(hdr, (void __user *)parms.origin, + parms.length)) + r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length, + &cmd->rc, &cmd->rrc); + + vfree(hdr); + break; + } + case KVM_PV_UNPACK: { + struct kvm_s390_pv_unp unp = {}; + + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm)) + break; + + r = -EFAULT; + if (copy_from_user(&unp, argp, sizeof(unp))) + break; + + r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak, + &cmd->rc, &cmd->rrc); + break; + } + case KVM_PV_VERIFY: { + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), + UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc); + KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc, + cmd->rrc); + break; + } + case KVM_PV_PREP_RESET: { + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), + UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc); + KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x", + cmd->rc, cmd->rrc); + break; + } + case KVM_PV_UNSHARE_ALL: { + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), + UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc); + KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x", + cmd->rc, cmd->rrc); + break; + } + case KVM_PV_INFO: { + struct kvm_s390_pv_info info = {}; + ssize_t data_len; + + /* + * No need to check the VM protection here. + * + * Maybe user space wants to query some of the data + * when the VM is still unprotected. If we see the + * need to fence a new data command we can still + * return an error in the info handler. + */ + + r = -EFAULT; + if (copy_from_user(&info, argp, sizeof(info.header))) + break; + + r = -EINVAL; + if (info.header.len_max < sizeof(info.header)) + break; + + data_len = kvm_s390_handle_pv_info(&info); + if (data_len < 0) { + r = data_len; + break; + } + /* + * If a data command struct is extended (multiple + * times) this can be used to determine how much of it + * is valid. + */ + info.header.len_written = data_len; + + r = -EFAULT; + if (copy_to_user(argp, &info, data_len)) + break; + + r = 0; + break; + } + case KVM_PV_DUMP: { + struct kvm_s390_pv_dmp dmp; + + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm)) + break; + + r = -EFAULT; + if (copy_from_user(&dmp, argp, sizeof(dmp))) + break; + + r = kvm_s390_pv_dmp(kvm, cmd, dmp); + if (r) + break; + + if (copy_to_user(argp, &dmp, sizeof(dmp))) { + r = -EFAULT; + break; + } + + break; + } + default: + r = -ENOTTY; + } + if (need_lock) + mutex_unlock(&kvm->lock); + + return r; +} + +static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags) +{ + if (mop->flags & ~supported_flags || !mop->size) + return -EINVAL; + if (mop->size > MEM_OP_MAX_SIZE) + return -E2BIG; + if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { + if (mop->key > 0xf) + return -EINVAL; + } else { + mop->key = 0; + } + return 0; +} + +static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) +{ + void __user *uaddr = (void __user *)mop->buf; + enum gacc_mode acc_mode; + void *tmpbuf = NULL; + int r, srcu_idx; + + r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION | + KVM_S390_MEMOP_F_CHECK_ONLY); + if (r) + return r; + + if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { + tmpbuf = vmalloc(mop->size); + if (!tmpbuf) + return -ENOMEM; + } + + srcu_idx = srcu_read_lock(&kvm->srcu); + + if (kvm_is_error_gpa(kvm, mop->gaddr)) { + r = PGM_ADDRESSING; + goto out_unlock; + } + + acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE; + if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { + r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key); + goto out_unlock; + } + if (acc_mode == GACC_FETCH) { + r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, + mop->size, GACC_FETCH, mop->key); + if (r) + goto out_unlock; + if (copy_to_user(uaddr, tmpbuf, mop->size)) + r = -EFAULT; + } else { + if (copy_from_user(tmpbuf, uaddr, mop->size)) { + r = -EFAULT; + goto out_unlock; + } + r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, + mop->size, GACC_STORE, mop->key); + } + +out_unlock: + srcu_read_unlock(&kvm->srcu, srcu_idx); + + vfree(tmpbuf); + return r; +} + +static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop) +{ + void __user *uaddr = (void __user *)mop->buf; + void __user *old_addr = (void __user *)mop->old_addr; + union { + __uint128_t quad; + char raw[sizeof(__uint128_t)]; + } old = { .quad = 0}, new = { .quad = 0 }; + unsigned int off_in_quad = sizeof(new) - mop->size; + int r, srcu_idx; + bool success; + + r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION); + if (r) + return r; + /* + * This validates off_in_quad. Checking that size is a power + * of two is not necessary, as cmpxchg_guest_abs_with_key + * takes care of that + */ + if (mop->size > sizeof(new)) + return -EINVAL; + if (copy_from_user(&new.raw[off_in_quad], uaddr, mop->size)) + return -EFAULT; + if (copy_from_user(&old.raw[off_in_quad], old_addr, mop->size)) + return -EFAULT; + + srcu_idx = srcu_read_lock(&kvm->srcu); + + if (kvm_is_error_gpa(kvm, mop->gaddr)) { + r = PGM_ADDRESSING; + goto out_unlock; + } + + r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old.quad, + new.quad, mop->key, &success); + if (!success && copy_to_user(old_addr, &old.raw[off_in_quad], mop->size)) + r = -EFAULT; + +out_unlock: + srcu_read_unlock(&kvm->srcu, srcu_idx); + return r; +} + +static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) +{ + /* + * This is technically a heuristic only, if the kvm->lock is not + * taken, it is not guaranteed that the vm is/remains non-protected. + * This is ok from a kernel perspective, wrongdoing is detected + * on the access, -EFAULT is returned and the vm may crash the + * next time it accesses the memory in question. + * There is no sane usecase to do switching and a memop on two + * different CPUs at the same time. + */ + if (kvm_s390_pv_get_handle(kvm)) + return -EINVAL; + + switch (mop->op) { + case KVM_S390_MEMOP_ABSOLUTE_READ: + case KVM_S390_MEMOP_ABSOLUTE_WRITE: + return kvm_s390_vm_mem_op_abs(kvm, mop); + case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG: + return kvm_s390_vm_mem_op_cmpxchg(kvm, mop); + default: + return -EINVAL; + } +} + +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) +{ + struct kvm *kvm = filp->private_data; + void __user *argp = (void __user *)arg; + struct kvm_device_attr attr; + int r; + + switch (ioctl) { + case KVM_S390_INTERRUPT: { + struct kvm_s390_interrupt s390int; + + r = -EFAULT; + if (copy_from_user(&s390int, argp, sizeof(s390int))) + break; + r = kvm_s390_inject_vm(kvm, &s390int); + break; + } + case KVM_CREATE_IRQCHIP: { + struct kvm_irq_routing_entry routing; + + r = -EINVAL; + if (kvm->arch.use_irqchip) { + /* Set up dummy routing. */ + memset(&routing, 0, sizeof(routing)); + r = kvm_set_irq_routing(kvm, &routing, 0, 0); + } + break; + } + case KVM_SET_DEVICE_ATTR: { + r = -EFAULT; + if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) + break; + r = kvm_s390_vm_set_attr(kvm, &attr); + break; + } + case KVM_GET_DEVICE_ATTR: { + r = -EFAULT; + if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) + break; + r = kvm_s390_vm_get_attr(kvm, &attr); + break; + } + case KVM_HAS_DEVICE_ATTR: { + r = -EFAULT; + if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) + break; + r = kvm_s390_vm_has_attr(kvm, &attr); + break; + } + case KVM_S390_GET_SKEYS: { + struct kvm_s390_skeys args; + + r = -EFAULT; + if (copy_from_user(&args, argp, + sizeof(struct kvm_s390_skeys))) + break; + r = kvm_s390_get_skeys(kvm, &args); + break; + } + case KVM_S390_SET_SKEYS: { + struct kvm_s390_skeys args; + + r = -EFAULT; + if (copy_from_user(&args, argp, + sizeof(struct kvm_s390_skeys))) + break; + r = kvm_s390_set_skeys(kvm, &args); + break; + } + case KVM_S390_GET_CMMA_BITS: { + struct kvm_s390_cmma_log args; + + r = -EFAULT; + if (copy_from_user(&args, argp, sizeof(args))) + break; + mutex_lock(&kvm->slots_lock); + r = kvm_s390_get_cmma_bits(kvm, &args); + mutex_unlock(&kvm->slots_lock); + if (!r) { + r = copy_to_user(argp, &args, sizeof(args)); + if (r) + r = -EFAULT; + } + break; + } + case KVM_S390_SET_CMMA_BITS: { + struct kvm_s390_cmma_log args; + + r = -EFAULT; + if (copy_from_user(&args, argp, sizeof(args))) + break; + mutex_lock(&kvm->slots_lock); + r = kvm_s390_set_cmma_bits(kvm, &args); + mutex_unlock(&kvm->slots_lock); + break; + } + case KVM_S390_PV_COMMAND: { + struct kvm_pv_cmd args; + + /* protvirt means user cpu state */ + kvm_s390_set_user_cpu_state_ctrl(kvm); + r = 0; + if (!is_prot_virt_host()) { + r = -EINVAL; + break; + } + if (copy_from_user(&args, argp, sizeof(args))) { + r = -EFAULT; + break; + } + if (args.flags) { + r = -EINVAL; + break; + } + /* must be called without kvm->lock */ + r = kvm_s390_handle_pv(kvm, &args); + if (copy_to_user(argp, &args, sizeof(args))) { + r = -EFAULT; + break; + } + break; + } + case KVM_S390_MEM_OP: { + struct kvm_s390_mem_op mem_op; + + if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) + r = kvm_s390_vm_mem_op(kvm, &mem_op); + else + r = -EFAULT; + break; + } + case KVM_S390_ZPCI_OP: { + struct kvm_s390_zpci_op args; + + r = -EINVAL; + if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) + break; + if (copy_from_user(&args, argp, sizeof(args))) { + r = -EFAULT; + break; + } + r = kvm_s390_pci_zpci_op(kvm, &args); + break; + } + default: + r = -ENOTTY; + } + + return r; +} + +static int kvm_s390_apxa_installed(void) +{ + struct ap_config_info info; + + if (ap_instructions_available()) { + if (ap_qci(&info) == 0) + return info.apxa; + } + + return 0; +} + +/* + * The format of the crypto control block (CRYCB) is specified in the 3 low + * order bits of the CRYCB designation (CRYCBD) field as follows: + * Format 0: Neither the message security assist extension 3 (MSAX3) nor the + * AP extended addressing (APXA) facility are installed. + * Format 1: The APXA facility is not installed but the MSAX3 facility is. + * Format 2: Both the APXA and MSAX3 facilities are installed + */ +static void kvm_s390_set_crycb_format(struct kvm *kvm) +{ + kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb; + + /* Clear the CRYCB format bits - i.e., set format 0 by default */ + kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); + + /* Check whether MSAX3 is installed */ + if (!test_kvm_facility(kvm, 76)) + return; + + if (kvm_s390_apxa_installed()) + kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; + else + kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; +} + +/* + * kvm_arch_crypto_set_masks + * + * @kvm: pointer to the target guest's KVM struct containing the crypto masks + * to be set. + * @apm: the mask identifying the accessible AP adapters + * @aqm: the mask identifying the accessible AP domains + * @adm: the mask identifying the accessible AP control domains + * + * Set the masks that identify the adapters, domains and control domains to + * which the KVM guest is granted access. + * + * Note: The kvm->lock mutex must be locked by the caller before invoking this + * function. + */ +void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, + unsigned long *aqm, unsigned long *adm) +{ + struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; + + kvm_s390_vcpu_block_all(kvm); + + switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { + case CRYCB_FORMAT2: /* APCB1 use 256 bits */ + memcpy(crycb->apcb1.apm, apm, 32); + VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", + apm[0], apm[1], apm[2], apm[3]); + memcpy(crycb->apcb1.aqm, aqm, 32); + VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", + aqm[0], aqm[1], aqm[2], aqm[3]); + memcpy(crycb->apcb1.adm, adm, 32); + VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", + adm[0], adm[1], adm[2], adm[3]); + break; + case CRYCB_FORMAT1: + case CRYCB_FORMAT0: /* Fall through both use APCB0 */ + memcpy(crycb->apcb0.apm, apm, 8); + memcpy(crycb->apcb0.aqm, aqm, 2); + memcpy(crycb->apcb0.adm, adm, 2); + VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", + apm[0], *((unsigned short *)aqm), + *((unsigned short *)adm)); + break; + default: /* Can not happen */ + break; + } + + /* recreate the shadow crycb for each vcpu */ + kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); + kvm_s390_vcpu_unblock_all(kvm); +} +EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); + +/* + * kvm_arch_crypto_clear_masks + * + * @kvm: pointer to the target guest's KVM struct containing the crypto masks + * to be cleared. + * + * Clear the masks that identify the adapters, domains and control domains to + * which the KVM guest is granted access. + * + * Note: The kvm->lock mutex must be locked by the caller before invoking this + * function. + */ +void kvm_arch_crypto_clear_masks(struct kvm *kvm) +{ + kvm_s390_vcpu_block_all(kvm); + + memset(&kvm->arch.crypto.crycb->apcb0, 0, + sizeof(kvm->arch.crypto.crycb->apcb0)); + memset(&kvm->arch.crypto.crycb->apcb1, 0, + sizeof(kvm->arch.crypto.crycb->apcb1)); + + VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); + /* recreate the shadow crycb for each vcpu */ + kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); + kvm_s390_vcpu_unblock_all(kvm); +} +EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); + +static u64 kvm_s390_get_initial_cpuid(void) +{ + struct cpuid cpuid; + + get_cpu_id(&cpuid); + cpuid.version = 0xff; + return *((u64 *) &cpuid); +} + +static void kvm_s390_crypto_init(struct kvm *kvm) +{ + kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; + kvm_s390_set_crycb_format(kvm); + init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem); + + if (!test_kvm_facility(kvm, 76)) + return; + + /* Enable AES/DEA protected key functions by default */ + kvm->arch.crypto.aes_kw = 1; + kvm->arch.crypto.dea_kw = 1; + get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); + get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); +} + +static void sca_dispose(struct kvm *kvm) +{ + if (kvm->arch.use_esca) + free_pages_exact(kvm->arch.sca, sizeof(struct esca_block)); + else + free_page((unsigned long)(kvm->arch.sca)); + kvm->arch.sca = NULL; +} + +void kvm_arch_free_vm(struct kvm *kvm) +{ + if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) + kvm_s390_pci_clear_list(kvm); + + __kvm_arch_free_vm(kvm); +} + +int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) +{ + gfp_t alloc_flags = GFP_KERNEL_ACCOUNT; + int i, rc; + char debug_name[16]; + static unsigned long sca_offset; + + rc = -EINVAL; +#ifdef CONFIG_KVM_S390_UCONTROL + if (type & ~KVM_VM_S390_UCONTROL) + goto out_err; + if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) + goto out_err; +#else + if (type) + goto out_err; +#endif + + rc = s390_enable_sie(); + if (rc) + goto out_err; + + rc = -ENOMEM; + + if (!sclp.has_64bscao) + alloc_flags |= GFP_DMA; + rwlock_init(&kvm->arch.sca_lock); + /* start with basic SCA */ + kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags); + if (!kvm->arch.sca) + goto out_err; + mutex_lock(&kvm_lock); + sca_offset += 16; + if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE) + sca_offset = 0; + kvm->arch.sca = (struct bsca_block *) + ((char *) kvm->arch.sca + sca_offset); + mutex_unlock(&kvm_lock); + + sprintf(debug_name, "kvm-%u", current->pid); + + kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); + if (!kvm->arch.dbf) + goto out_err; + + BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); + kvm->arch.sie_page2 = + (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA); + if (!kvm->arch.sie_page2) + goto out_err; + + kvm->arch.sie_page2->kvm = kvm; + kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; + + for (i = 0; i < kvm_s390_fac_size(); i++) { + kvm->arch.model.fac_mask[i] = stfle_fac_list[i] & + (kvm_s390_fac_base[i] | + kvm_s390_fac_ext[i]); + kvm->arch.model.fac_list[i] = stfle_fac_list[i] & + kvm_s390_fac_base[i]; + } + kvm->arch.model.subfuncs = kvm_s390_available_subfunc; + + /* we are always in czam mode - even on pre z14 machines */ + set_kvm_facility(kvm->arch.model.fac_mask, 138); + set_kvm_facility(kvm->arch.model.fac_list, 138); + /* we emulate STHYI in kvm */ + set_kvm_facility(kvm->arch.model.fac_mask, 74); + set_kvm_facility(kvm->arch.model.fac_list, 74); + if (MACHINE_HAS_TLB_GUEST) { + set_kvm_facility(kvm->arch.model.fac_mask, 147); + set_kvm_facility(kvm->arch.model.fac_list, 147); + } + + if (css_general_characteristics.aiv && test_facility(65)) + set_kvm_facility(kvm->arch.model.fac_mask, 65); + + kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); + kvm->arch.model.ibc = sclp.ibc & 0x0fff; + + kvm->arch.model.uv_feat_guest.feat = 0; + + kvm_s390_crypto_init(kvm); + + if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { + mutex_lock(&kvm->lock); + kvm_s390_pci_init_list(kvm); + kvm_s390_vcpu_pci_enable_interp(kvm); + mutex_unlock(&kvm->lock); + } + + mutex_init(&kvm->arch.float_int.ais_lock); + spin_lock_init(&kvm->arch.float_int.lock); + for (i = 0; i < FIRQ_LIST_COUNT; i++) + INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); + init_waitqueue_head(&kvm->arch.ipte_wq); + mutex_init(&kvm->arch.ipte_mutex); + + debug_register_view(kvm->arch.dbf, &debug_sprintf_view); + VM_EVENT(kvm, 3, "vm created with type %lu", type); + + if (type & KVM_VM_S390_UCONTROL) { + kvm->arch.gmap = NULL; + kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT; + } else { + if (sclp.hamax == U64_MAX) + kvm->arch.mem_limit = TASK_SIZE_MAX; + else + kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX, + sclp.hamax + 1); + kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1); + if (!kvm->arch.gmap) + goto out_err; + kvm->arch.gmap->private = kvm; + kvm->arch.gmap->pfault_enabled = 0; + } + + kvm->arch.use_pfmfi = sclp.has_pfmfi; + kvm->arch.use_skf = sclp.has_skey; + spin_lock_init(&kvm->arch.start_stop_lock); + kvm_s390_vsie_init(kvm); + if (use_gisa) + kvm_s390_gisa_init(kvm); + INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup); + kvm->arch.pv.set_aside = NULL; + KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid); + + return 0; +out_err: + free_page((unsigned long)kvm->arch.sie_page2); + debug_unregister(kvm->arch.dbf); + sca_dispose(kvm); + KVM_EVENT(3, "creation of vm failed: %d", rc); + return rc; +} + +void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) +{ + u16 rc, rrc; + + VCPU_EVENT(vcpu, 3, "%s", "free cpu"); + trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); + kvm_s390_clear_local_irqs(vcpu); + kvm_clear_async_pf_completion_queue(vcpu); + if (!kvm_is_ucontrol(vcpu->kvm)) + sca_del_vcpu(vcpu); + kvm_s390_update_topology_change_report(vcpu->kvm, 1); + + if (kvm_is_ucontrol(vcpu->kvm)) + gmap_remove(vcpu->arch.gmap); + + if (vcpu->kvm->arch.use_cmma) + kvm_s390_vcpu_unsetup_cmma(vcpu); + /* We can not hold the vcpu mutex here, we are already dying */ + if (kvm_s390_pv_cpu_get_handle(vcpu)) + kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc); + free_page((unsigned long)(vcpu->arch.sie_block)); +} + +void kvm_arch_destroy_vm(struct kvm *kvm) +{ + u16 rc, rrc; + + kvm_destroy_vcpus(kvm); + sca_dispose(kvm); + kvm_s390_gisa_destroy(kvm); + /* + * We are already at the end of life and kvm->lock is not taken. + * This is ok as the file descriptor is closed by now and nobody + * can mess with the pv state. + */ + kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc); + /* + * Remove the mmu notifier only when the whole KVM VM is torn down, + * and only if one was registered to begin with. If the VM is + * currently not protected, but has been previously been protected, + * then it's possible that the notifier is still registered. + */ + if (kvm->arch.pv.mmu_notifier.ops) + mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm); + + debug_unregister(kvm->arch.dbf); + free_page((unsigned long)kvm->arch.sie_page2); + if (!kvm_is_ucontrol(kvm)) + gmap_remove(kvm->arch.gmap); + kvm_s390_destroy_adapters(kvm); + kvm_s390_clear_float_irqs(kvm); + kvm_s390_vsie_destroy(kvm); + KVM_EVENT(3, "vm 0x%pK destroyed", kvm); +} + +/* Section: vcpu related */ +static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) +{ + vcpu->arch.gmap = gmap_create(current->mm, -1UL); + if (!vcpu->arch.gmap) + return -ENOMEM; + vcpu->arch.gmap->private = vcpu->kvm; + + return 0; +} + +static void sca_del_vcpu(struct kvm_vcpu *vcpu) +{ + if (!kvm_s390_use_sca_entries()) + return; + read_lock(&vcpu->kvm->arch.sca_lock); + if (vcpu->kvm->arch.use_esca) { + struct esca_block *sca = vcpu->kvm->arch.sca; + + clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); + sca->cpu[vcpu->vcpu_id].sda = 0; + } else { + struct bsca_block *sca = vcpu->kvm->arch.sca; + + clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); + sca->cpu[vcpu->vcpu_id].sda = 0; + } + read_unlock(&vcpu->kvm->arch.sca_lock); +} + +static void sca_add_vcpu(struct kvm_vcpu *vcpu) +{ + if (!kvm_s390_use_sca_entries()) { + phys_addr_t sca_phys = virt_to_phys(vcpu->kvm->arch.sca); + + /* we still need the basic sca for the ipte control */ + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys; + return; + } + read_lock(&vcpu->kvm->arch.sca_lock); + if (vcpu->kvm->arch.use_esca) { + struct esca_block *sca = vcpu->kvm->arch.sca; + phys_addr_t sca_phys = virt_to_phys(sca); + + sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK; + vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; + set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); + } else { + struct bsca_block *sca = vcpu->kvm->arch.sca; + phys_addr_t sca_phys = virt_to_phys(sca); + + sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys; + set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); + } + read_unlock(&vcpu->kvm->arch.sca_lock); +} + +/* Basic SCA to Extended SCA data copy routines */ +static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s) +{ + d->sda = s->sda; + d->sigp_ctrl.c = s->sigp_ctrl.c; + d->sigp_ctrl.scn = s->sigp_ctrl.scn; +} + +static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s) +{ + int i; + + d->ipte_control = s->ipte_control; + d->mcn[0] = s->mcn; + for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++) + sca_copy_entry(&d->cpu[i], &s->cpu[i]); +} + +static int sca_switch_to_extended(struct kvm *kvm) +{ + struct bsca_block *old_sca = kvm->arch.sca; + struct esca_block *new_sca; + struct kvm_vcpu *vcpu; + unsigned long vcpu_idx; + u32 scaol, scaoh; + phys_addr_t new_sca_phys; + + if (kvm->arch.use_esca) + return 0; + + new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL_ACCOUNT | __GFP_ZERO); + if (!new_sca) + return -ENOMEM; + + new_sca_phys = virt_to_phys(new_sca); + scaoh = new_sca_phys >> 32; + scaol = new_sca_phys & ESCA_SCAOL_MASK; + + kvm_s390_vcpu_block_all(kvm); + write_lock(&kvm->arch.sca_lock); + + sca_copy_b_to_e(new_sca, old_sca); + + kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) { + vcpu->arch.sie_block->scaoh = scaoh; + vcpu->arch.sie_block->scaol = scaol; + vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; + } + kvm->arch.sca = new_sca; + kvm->arch.use_esca = 1; + + write_unlock(&kvm->arch.sca_lock); + kvm_s390_vcpu_unblock_all(kvm); + + free_page((unsigned long)old_sca); + + VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)", + old_sca, kvm->arch.sca); + return 0; +} + +static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) +{ + int rc; + + if (!kvm_s390_use_sca_entries()) { + if (id < KVM_MAX_VCPUS) + return true; + return false; + } + if (id < KVM_S390_BSCA_CPU_SLOTS) + return true; + if (!sclp.has_esca || !sclp.has_64bscao) + return false; + + rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm); + + return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS; +} + +/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ +static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + WARN_ON_ONCE(vcpu->arch.cputm_start != 0); + raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); + vcpu->arch.cputm_start = get_tod_clock_fast(); + raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); +} + +/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ +static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + WARN_ON_ONCE(vcpu->arch.cputm_start == 0); + raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); + vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; + vcpu->arch.cputm_start = 0; + raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); +} + +/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ +static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + WARN_ON_ONCE(vcpu->arch.cputm_enabled); + vcpu->arch.cputm_enabled = true; + __start_cpu_timer_accounting(vcpu); +} + +/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ +static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + WARN_ON_ONCE(!vcpu->arch.cputm_enabled); + __stop_cpu_timer_accounting(vcpu); + vcpu->arch.cputm_enabled = false; +} + +static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + preempt_disable(); /* protect from TOD sync and vcpu_load/put */ + __enable_cpu_timer_accounting(vcpu); + preempt_enable(); +} + +static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) +{ + preempt_disable(); /* protect from TOD sync and vcpu_load/put */ + __disable_cpu_timer_accounting(vcpu); + preempt_enable(); +} + +/* set the cpu timer - may only be called from the VCPU thread itself */ +void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) +{ + preempt_disable(); /* protect from TOD sync and vcpu_load/put */ + raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); + if (vcpu->arch.cputm_enabled) + vcpu->arch.cputm_start = get_tod_clock_fast(); + vcpu->arch.sie_block->cputm = cputm; + raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); + preempt_enable(); +} + +/* update and get the cpu timer - can also be called from other VCPU threads */ +__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) +{ + unsigned int seq; + __u64 value; + + if (unlikely(!vcpu->arch.cputm_enabled)) + return vcpu->arch.sie_block->cputm; + + preempt_disable(); /* protect from TOD sync and vcpu_load/put */ + do { + seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); + /* + * If the writer would ever execute a read in the critical + * section, e.g. in irq context, we have a deadlock. + */ + WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); + value = vcpu->arch.sie_block->cputm; + /* if cputm_start is 0, accounting is being started/stopped */ + if (likely(vcpu->arch.cputm_start)) + value -= get_tod_clock_fast() - vcpu->arch.cputm_start; + } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); + preempt_enable(); + return value; +} + +void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + + gmap_enable(vcpu->arch.enabled_gmap); + kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); + if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) + __start_cpu_timer_accounting(vcpu); + vcpu->cpu = cpu; +} + +void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) +{ + vcpu->cpu = -1; + if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) + __stop_cpu_timer_accounting(vcpu); + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); + vcpu->arch.enabled_gmap = gmap_get_enabled(); + gmap_disable(vcpu->arch.enabled_gmap); + +} + +void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) +{ + mutex_lock(&vcpu->kvm->lock); + preempt_disable(); + vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; + vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; + preempt_enable(); + mutex_unlock(&vcpu->kvm->lock); + if (!kvm_is_ucontrol(vcpu->kvm)) { + vcpu->arch.gmap = vcpu->kvm->arch.gmap; + sca_add_vcpu(vcpu); + } + if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) + vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; + /* make vcpu_load load the right gmap on the first trigger */ + vcpu->arch.enabled_gmap = vcpu->arch.gmap; +} + +static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr) +{ + if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) && + test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo)) + return true; + return false; +} + +static bool kvm_has_pckmo_ecc(struct kvm *kvm) +{ + /* At least one ECC subfunction must be present */ + return kvm_has_pckmo_subfunc(kvm, 32) || + kvm_has_pckmo_subfunc(kvm, 33) || + kvm_has_pckmo_subfunc(kvm, 34) || + kvm_has_pckmo_subfunc(kvm, 40) || + kvm_has_pckmo_subfunc(kvm, 41); + +} + +static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) +{ + /* + * If the AP instructions are not being interpreted and the MSAX3 + * facility is not configured for the guest, there is nothing to set up. + */ + if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) + return; + + vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; + vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); + vcpu->arch.sie_block->eca &= ~ECA_APIE; + vcpu->arch.sie_block->ecd &= ~ECD_ECC; + + if (vcpu->kvm->arch.crypto.apie) + vcpu->arch.sie_block->eca |= ECA_APIE; + + /* Set up protected key support */ + if (vcpu->kvm->arch.crypto.aes_kw) { + vcpu->arch.sie_block->ecb3 |= ECB3_AES; + /* ecc is also wrapped with AES key */ + if (kvm_has_pckmo_ecc(vcpu->kvm)) + vcpu->arch.sie_block->ecd |= ECD_ECC; + } + + if (vcpu->kvm->arch.crypto.dea_kw) + vcpu->arch.sie_block->ecb3 |= ECB3_DEA; +} + +void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) +{ + free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo)); + vcpu->arch.sie_block->cbrlo = 0; +} + +int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) +{ + void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); + + if (!cbrlo_page) + return -ENOMEM; + + vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page); + return 0; +} + +static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; + + vcpu->arch.sie_block->ibc = model->ibc; + if (test_kvm_facility(vcpu->kvm, 7)) + vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list); +} + +static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) +{ + int rc = 0; + u16 uvrc, uvrrc; + + atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | + CPUSTAT_SM | + CPUSTAT_STOPPED); + + if (test_kvm_facility(vcpu->kvm, 78)) + kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); + else if (test_kvm_facility(vcpu->kvm, 8)) + kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); + + kvm_s390_vcpu_setup_model(vcpu); + + /* pgste_set_pte has special handling for !MACHINE_HAS_ESOP */ + if (MACHINE_HAS_ESOP) + vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; + if (test_kvm_facility(vcpu->kvm, 9)) + vcpu->arch.sie_block->ecb |= ECB_SRSI; + if (test_kvm_facility(vcpu->kvm, 11)) + vcpu->arch.sie_block->ecb |= ECB_PTF; + if (test_kvm_facility(vcpu->kvm, 73)) + vcpu->arch.sie_block->ecb |= ECB_TE; + if (!kvm_is_ucontrol(vcpu->kvm)) + vcpu->arch.sie_block->ecb |= ECB_SPECI; + + if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) + vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; + if (test_kvm_facility(vcpu->kvm, 130)) + vcpu->arch.sie_block->ecb2 |= ECB2_IEP; + vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; + if (sclp.has_cei) + vcpu->arch.sie_block->eca |= ECA_CEI; + if (sclp.has_ib) + vcpu->arch.sie_block->eca |= ECA_IB; + if (sclp.has_siif) + vcpu->arch.sie_block->eca |= ECA_SII; + if (sclp.has_sigpif) + vcpu->arch.sie_block->eca |= ECA_SIGPI; + if (test_kvm_facility(vcpu->kvm, 129)) { + vcpu->arch.sie_block->eca |= ECA_VX; + vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; + } + if (test_kvm_facility(vcpu->kvm, 139)) + vcpu->arch.sie_block->ecd |= ECD_MEF; + if (test_kvm_facility(vcpu->kvm, 156)) + vcpu->arch.sie_block->ecd |= ECD_ETOKENF; + if (vcpu->arch.sie_block->gd) { + vcpu->arch.sie_block->eca |= ECA_AIV; + VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", + vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); + } + vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC; + vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb); + + if (sclp.has_kss) + kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); + else + vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; + + if (vcpu->kvm->arch.use_cmma) { + rc = kvm_s390_vcpu_setup_cmma(vcpu); + if (rc) + return rc; + } + hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; + + vcpu->arch.sie_block->hpid = HPID_KVM; + + kvm_s390_vcpu_crypto_setup(vcpu); + + kvm_s390_vcpu_pci_setup(vcpu); + + mutex_lock(&vcpu->kvm->lock); + if (kvm_s390_pv_is_protected(vcpu->kvm)) { + rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc); + if (rc) + kvm_s390_vcpu_unsetup_cmma(vcpu); + } + mutex_unlock(&vcpu->kvm->lock); + + return rc; +} + +int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) +{ + if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) + return -EINVAL; + return 0; +} + +int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) +{ + struct sie_page *sie_page; + int rc; + + BUILD_BUG_ON(sizeof(struct sie_page) != 4096); + sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT); + if (!sie_page) + return -ENOMEM; + + vcpu->arch.sie_block = &sie_page->sie_block; + vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb); + + /* the real guest size will always be smaller than msl */ + vcpu->arch.sie_block->mso = 0; + vcpu->arch.sie_block->msl = sclp.hamax; + + vcpu->arch.sie_block->icpua = vcpu->vcpu_id; + spin_lock_init(&vcpu->arch.local_int.lock); + vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm); + seqcount_init(&vcpu->arch.cputm_seqcount); + + vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; + kvm_clear_async_pf_completion_queue(vcpu); + vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | + KVM_SYNC_GPRS | + KVM_SYNC_ACRS | + KVM_SYNC_CRS | + KVM_SYNC_ARCH0 | + KVM_SYNC_PFAULT | + KVM_SYNC_DIAG318; + kvm_s390_set_prefix(vcpu, 0); + if (test_kvm_facility(vcpu->kvm, 64)) + vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; + if (test_kvm_facility(vcpu->kvm, 82)) + vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; + if (test_kvm_facility(vcpu->kvm, 133)) + vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; + if (test_kvm_facility(vcpu->kvm, 156)) + vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; + /* fprs can be synchronized via vrs, even if the guest has no vx. With + * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format. + */ + if (MACHINE_HAS_VX) + vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; + else + vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; + + if (kvm_is_ucontrol(vcpu->kvm)) { + rc = __kvm_ucontrol_vcpu_init(vcpu); + if (rc) + goto out_free_sie_block; + } + + VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", + vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); + trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); + + rc = kvm_s390_vcpu_setup(vcpu); + if (rc) + goto out_ucontrol_uninit; + + kvm_s390_update_topology_change_report(vcpu->kvm, 1); + return 0; + +out_ucontrol_uninit: + if (kvm_is_ucontrol(vcpu->kvm)) + gmap_remove(vcpu->arch.gmap); +out_free_sie_block: + free_page((unsigned long)(vcpu->arch.sie_block)); + return rc; +} + +int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) +{ + clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); + return kvm_s390_vcpu_has_irq(vcpu, 0); +} + +bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) +{ + return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); +} + +void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) +{ + atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); + exit_sie(vcpu); +} + +void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) +{ + atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); +} + +static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) +{ + atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); + exit_sie(vcpu); +} + +bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) +{ + return atomic_read(&vcpu->arch.sie_block->prog20) & + (PROG_BLOCK_SIE | PROG_REQUEST); +} + +static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) +{ + atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); +} + +/* + * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. + * If the CPU is not running (e.g. waiting as idle) the function will + * return immediately. */ +void exit_sie(struct kvm_vcpu *vcpu) +{ + kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); + kvm_s390_vsie_kick(vcpu); + while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) + cpu_relax(); +} + +/* Kick a guest cpu out of SIE to process a request synchronously */ +void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) +{ + __kvm_make_request(req, vcpu); + kvm_s390_vcpu_request(vcpu); +} + +static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, + unsigned long end) +{ + struct kvm *kvm = gmap->private; + struct kvm_vcpu *vcpu; + unsigned long prefix; + unsigned long i; + + if (gmap_is_shadow(gmap)) + return; + if (start >= 1UL << 31) + /* We are only interested in prefix pages */ + return; + kvm_for_each_vcpu(i, vcpu, kvm) { + /* match against both prefix pages */ + prefix = kvm_s390_get_prefix(vcpu); + if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) { + VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx", + start, end); + kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); + } + } +} + +bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) +{ + /* do not poll with more than halt_poll_max_steal percent of steal time */ + if (S390_lowcore.avg_steal_timer * 100 / (TICK_USEC << 12) >= + READ_ONCE(halt_poll_max_steal)) { + vcpu->stat.halt_no_poll_steal++; + return true; + } + return false; +} + +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) +{ + /* kvm common code refers to this, but never calls it */ + BUG(); + return 0; +} + +static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, + struct kvm_one_reg *reg) +{ + int r = -EINVAL; + + switch (reg->id) { + case KVM_REG_S390_TODPR: + r = put_user(vcpu->arch.sie_block->todpr, + (u32 __user *)reg->addr); + break; + case KVM_REG_S390_EPOCHDIFF: + r = put_user(vcpu->arch.sie_block->epoch, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_CPU_TIMER: + r = put_user(kvm_s390_get_cpu_timer(vcpu), + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_CLOCK_COMP: + r = put_user(vcpu->arch.sie_block->ckc, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PFTOKEN: + r = put_user(vcpu->arch.pfault_token, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PFCOMPARE: + r = put_user(vcpu->arch.pfault_compare, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PFSELECT: + r = put_user(vcpu->arch.pfault_select, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PP: + r = put_user(vcpu->arch.sie_block->pp, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_GBEA: + r = put_user(vcpu->arch.sie_block->gbea, + (u64 __user *)reg->addr); + break; + default: + break; + } + + return r; +} + +static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, + struct kvm_one_reg *reg) +{ + int r = -EINVAL; + __u64 val; + + switch (reg->id) { + case KVM_REG_S390_TODPR: + r = get_user(vcpu->arch.sie_block->todpr, + (u32 __user *)reg->addr); + break; + case KVM_REG_S390_EPOCHDIFF: + r = get_user(vcpu->arch.sie_block->epoch, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_CPU_TIMER: + r = get_user(val, (u64 __user *)reg->addr); + if (!r) + kvm_s390_set_cpu_timer(vcpu, val); + break; + case KVM_REG_S390_CLOCK_COMP: + r = get_user(vcpu->arch.sie_block->ckc, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PFTOKEN: + r = get_user(vcpu->arch.pfault_token, + (u64 __user *)reg->addr); + if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) + kvm_clear_async_pf_completion_queue(vcpu); + break; + case KVM_REG_S390_PFCOMPARE: + r = get_user(vcpu->arch.pfault_compare, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PFSELECT: + r = get_user(vcpu->arch.pfault_select, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_PP: + r = get_user(vcpu->arch.sie_block->pp, + (u64 __user *)reg->addr); + break; + case KVM_REG_S390_GBEA: + r = get_user(vcpu->arch.sie_block->gbea, + (u64 __user *)reg->addr); + break; + default: + break; + } + + return r; +} + +static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu) +{ + vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI; + vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; + memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb)); + + kvm_clear_async_pf_completion_queue(vcpu); + if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) + kvm_s390_vcpu_stop(vcpu); + kvm_s390_clear_local_irqs(vcpu); +} + +static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) +{ + /* Initial reset is a superset of the normal reset */ + kvm_arch_vcpu_ioctl_normal_reset(vcpu); + + /* + * This equals initial cpu reset in pop, but we don't switch to ESA. + * We do not only reset the internal data, but also ... + */ + vcpu->arch.sie_block->gpsw.mask = 0; + vcpu->arch.sie_block->gpsw.addr = 0; + kvm_s390_set_prefix(vcpu, 0); + kvm_s390_set_cpu_timer(vcpu, 0); + vcpu->arch.sie_block->ckc = 0; + memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); + vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; + vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; + + /* ... the data in sync regs */ + memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs)); + vcpu->run->s.regs.ckc = 0; + vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK; + vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK; + vcpu->run->psw_addr = 0; + vcpu->run->psw_mask = 0; + vcpu->run->s.regs.todpr = 0; + vcpu->run->s.regs.cputm = 0; + vcpu->run->s.regs.ckc = 0; + vcpu->run->s.regs.pp = 0; + vcpu->run->s.regs.gbea = 1; + vcpu->run->s.regs.fpc = 0; + /* + * Do not reset these registers in the protected case, as some of + * them are overlaid and they are not accessible in this case + * anyway. + */ + if (!kvm_s390_pv_cpu_is_protected(vcpu)) { + vcpu->arch.sie_block->gbea = 1; + vcpu->arch.sie_block->pp = 0; + vcpu->arch.sie_block->fpf &= ~FPF_BPBC; + vcpu->arch.sie_block->todpr = 0; + } +} + +static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) +{ + struct kvm_sync_regs *regs = &vcpu->run->s.regs; + + /* Clear reset is a superset of the initial reset */ + kvm_arch_vcpu_ioctl_initial_reset(vcpu); + + memset(®s->gprs, 0, sizeof(regs->gprs)); + memset(®s->vrs, 0, sizeof(regs->vrs)); + memset(®s->acrs, 0, sizeof(regs->acrs)); + memset(®s->gscb, 0, sizeof(regs->gscb)); + + regs->etoken = 0; + regs->etoken_extension = 0; +} + +int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + vcpu_load(vcpu); + memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); + vcpu_put(vcpu); + return 0; +} + +int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) +{ + vcpu_load(vcpu); + memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); + vcpu_put(vcpu); + return 0; +} + +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + vcpu_load(vcpu); + + memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); + memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); + + vcpu_put(vcpu); + return 0; +} + +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + vcpu_load(vcpu); + + memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); + memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); + + vcpu_put(vcpu); + return 0; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + int ret = 0; + + vcpu_load(vcpu); + + if (test_fp_ctl(fpu->fpc)) { + ret = -EINVAL; + goto out; + } + vcpu->run->s.regs.fpc = fpu->fpc; + if (MACHINE_HAS_VX) + convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, + (freg_t *) fpu->fprs); + else + memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); + +out: + vcpu_put(vcpu); + return ret; +} + +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + vcpu_load(vcpu); + + /* make sure we have the latest values */ + save_fpu_regs(); + if (MACHINE_HAS_VX) + convert_vx_to_fp((freg_t *) fpu->fprs, + (__vector128 *) vcpu->run->s.regs.vrs); + else + memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); + fpu->fpc = vcpu->run->s.regs.fpc; + + vcpu_put(vcpu); + return 0; +} + +static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) +{ + int rc = 0; + + if (!is_vcpu_stopped(vcpu)) + rc = -EBUSY; + else { + vcpu->run->psw_mask = psw.mask; + vcpu->run->psw_addr = psw.addr; + } + return rc; +} + +int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, + struct kvm_translation *tr) +{ + return -EINVAL; /* not implemented yet */ +} + +#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ + KVM_GUESTDBG_USE_HW_BP | \ + KVM_GUESTDBG_ENABLE) + +int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, + struct kvm_guest_debug *dbg) +{ + int rc = 0; + + vcpu_load(vcpu); + + vcpu->guest_debug = 0; + kvm_s390_clear_bp_data(vcpu); + + if (dbg->control & ~VALID_GUESTDBG_FLAGS) { + rc = -EINVAL; + goto out; + } + if (!sclp.has_gpere) { + rc = -EINVAL; + goto out; + } + + if (dbg->control & KVM_GUESTDBG_ENABLE) { + vcpu->guest_debug = dbg->control; + /* enforce guest PER */ + kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); + + if (dbg->control & KVM_GUESTDBG_USE_HW_BP) + rc = kvm_s390_import_bp_data(vcpu, dbg); + } else { + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); + vcpu->arch.guestdbg.last_bp = 0; + } + + if (rc) { + vcpu->guest_debug = 0; + kvm_s390_clear_bp_data(vcpu); + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); + } + +out: + vcpu_put(vcpu); + return rc; +} + +int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + int ret; + + vcpu_load(vcpu); + + /* CHECK_STOP and LOAD are not supported yet */ + ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : + KVM_MP_STATE_OPERATING; + + vcpu_put(vcpu); + return ret; +} + +int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + int rc = 0; + + vcpu_load(vcpu); + + /* user space knows about this interface - let it control the state */ + kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm); + + switch (mp_state->mp_state) { + case KVM_MP_STATE_STOPPED: + rc = kvm_s390_vcpu_stop(vcpu); + break; + case KVM_MP_STATE_OPERATING: + rc = kvm_s390_vcpu_start(vcpu); + break; + case KVM_MP_STATE_LOAD: + if (!kvm_s390_pv_cpu_is_protected(vcpu)) { + rc = -ENXIO; + break; + } + rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD); + break; + case KVM_MP_STATE_CHECK_STOP: + fallthrough; /* CHECK_STOP and LOAD are not supported yet */ + default: + rc = -ENXIO; + } + + vcpu_put(vcpu); + return rc; +} + +static bool ibs_enabled(struct kvm_vcpu *vcpu) +{ + return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); +} + +static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) +{ +retry: + kvm_s390_vcpu_request_handled(vcpu); + if (!kvm_request_pending(vcpu)) + return 0; + /* + * If the guest prefix changed, re-arm the ipte notifier for the + * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. + * This ensures that the ipte instruction for this request has + * already finished. We might race against a second unmapper that + * wants to set the blocking bit. Lets just retry the request loop. + */ + if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) { + int rc; + rc = gmap_mprotect_notify(vcpu->arch.gmap, + kvm_s390_get_prefix(vcpu), + PAGE_SIZE * 2, PROT_WRITE); + if (rc) { + kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); + return rc; + } + goto retry; + } + + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + vcpu->arch.sie_block->ihcpu = 0xffff; + goto retry; + } + + if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { + if (!ibs_enabled(vcpu)) { + trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); + kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); + } + goto retry; + } + + if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { + if (ibs_enabled(vcpu)) { + trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); + } + goto retry; + } + + if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { + vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; + goto retry; + } + + if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { + /* + * Disable CMM virtualization; we will emulate the ESSA + * instruction manually, in order to provide additional + * functionalities needed for live migration. + */ + vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; + goto retry; + } + + if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { + /* + * Re-enable CMM virtualization if CMMA is available and + * CMM has been used. + */ + if ((vcpu->kvm->arch.use_cmma) && + (vcpu->kvm->mm->context.uses_cmm)) + vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; + goto retry; + } + + /* we left the vsie handler, nothing to do, just clear the request */ + kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); + + return 0; +} + +static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) +{ + struct kvm_vcpu *vcpu; + union tod_clock clk; + unsigned long i; + + preempt_disable(); + + store_tod_clock_ext(&clk); + + kvm->arch.epoch = gtod->tod - clk.tod; + kvm->arch.epdx = 0; + if (test_kvm_facility(kvm, 139)) { + kvm->arch.epdx = gtod->epoch_idx - clk.ei; + if (kvm->arch.epoch > gtod->tod) + kvm->arch.epdx -= 1; + } + + kvm_s390_vcpu_block_all(kvm); + kvm_for_each_vcpu(i, vcpu, kvm) { + vcpu->arch.sie_block->epoch = kvm->arch.epoch; + vcpu->arch.sie_block->epdx = kvm->arch.epdx; + } + + kvm_s390_vcpu_unblock_all(kvm); + preempt_enable(); +} + +int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) +{ + if (!mutex_trylock(&kvm->lock)) + return 0; + __kvm_s390_set_tod_clock(kvm, gtod); + mutex_unlock(&kvm->lock); + return 1; +} + +/** + * kvm_arch_fault_in_page - fault-in guest page if necessary + * @vcpu: The corresponding virtual cpu + * @gpa: Guest physical address + * @writable: Whether the page should be writable or not + * + * Make sure that a guest page has been faulted-in on the host. + * + * Return: Zero on success, negative error code otherwise. + */ +long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable) +{ + return gmap_fault(vcpu->arch.gmap, gpa, + writable ? FAULT_FLAG_WRITE : 0); +} + +static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, + unsigned long token) +{ + struct kvm_s390_interrupt inti; + struct kvm_s390_irq irq; + + if (start_token) { + irq.u.ext.ext_params2 = token; + irq.type = KVM_S390_INT_PFAULT_INIT; + WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); + } else { + inti.type = KVM_S390_INT_PFAULT_DONE; + inti.parm64 = token; + WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); + } +} + +bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work) +{ + trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); + __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); + + return true; +} + +void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work) +{ + trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); + __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); +} + +void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work) +{ + /* s390 will always inject the page directly */ +} + +bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) +{ + /* + * s390 will always inject the page directly, + * but we still want check_async_completion to cleanup + */ + return true; +} + +static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) +{ + hva_t hva; + struct kvm_arch_async_pf arch; + + if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) + return false; + if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != + vcpu->arch.pfault_compare) + return false; + if (psw_extint_disabled(vcpu)) + return false; + if (kvm_s390_vcpu_has_irq(vcpu, 0)) + return false; + if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) + return false; + if (!vcpu->arch.gmap->pfault_enabled) + return false; + + hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); + hva += current->thread.gmap_addr & ~PAGE_MASK; + if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) + return false; + + return kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); +} + +static int vcpu_pre_run(struct kvm_vcpu *vcpu) +{ + int rc, cpuflags; + + /* + * On s390 notifications for arriving pages will be delivered directly + * to the guest but the house keeping for completed pfaults is + * handled outside the worker. + */ + kvm_check_async_pf_completion(vcpu); + + vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; + vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; + + if (need_resched()) + schedule(); + + if (!kvm_is_ucontrol(vcpu->kvm)) { + rc = kvm_s390_deliver_pending_interrupts(vcpu); + if (rc || guestdbg_exit_pending(vcpu)) + return rc; + } + + rc = kvm_s390_handle_requests(vcpu); + if (rc) + return rc; + + if (guestdbg_enabled(vcpu)) { + kvm_s390_backup_guest_per_regs(vcpu); + kvm_s390_patch_guest_per_regs(vcpu); + } + + clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); + + vcpu->arch.sie_block->icptcode = 0; + cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); + VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); + trace_kvm_s390_sie_enter(vcpu, cpuflags); + + return 0; +} + +static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu) +{ + struct kvm_s390_pgm_info pgm_info = { + .code = PGM_ADDRESSING, + }; + u8 opcode, ilen; + int rc; + + VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); + trace_kvm_s390_sie_fault(vcpu); + + /* + * We want to inject an addressing exception, which is defined as a + * suppressing or terminating exception. However, since we came here + * by a DAT access exception, the PSW still points to the faulting + * instruction since DAT exceptions are nullifying. So we've got + * to look up the current opcode to get the length of the instruction + * to be able to forward the PSW. + */ + rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); + ilen = insn_length(opcode); + if (rc < 0) { + return rc; + } else if (rc) { + /* Instruction-Fetching Exceptions - we can't detect the ilen. + * Forward by arbitrary ilc, injection will take care of + * nullification if necessary. + */ + pgm_info = vcpu->arch.pgm; + ilen = 4; + } + pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; + kvm_s390_forward_psw(vcpu, ilen); + return kvm_s390_inject_prog_irq(vcpu, &pgm_info); +} + +static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) +{ + struct mcck_volatile_info *mcck_info; + struct sie_page *sie_page; + + VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", + vcpu->arch.sie_block->icptcode); + trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); + + if (guestdbg_enabled(vcpu)) + kvm_s390_restore_guest_per_regs(vcpu); + + vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; + vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; + + if (exit_reason == -EINTR) { + VCPU_EVENT(vcpu, 3, "%s", "machine check"); + sie_page = container_of(vcpu->arch.sie_block, + struct sie_page, sie_block); + mcck_info = &sie_page->mcck_info; + kvm_s390_reinject_machine_check(vcpu, mcck_info); + return 0; + } + + if (vcpu->arch.sie_block->icptcode > 0) { + int rc = kvm_handle_sie_intercept(vcpu); + + if (rc != -EOPNOTSUPP) + return rc; + vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; + vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; + vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; + vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; + return -EREMOTE; + } else if (exit_reason != -EFAULT) { + vcpu->stat.exit_null++; + return 0; + } else if (kvm_is_ucontrol(vcpu->kvm)) { + vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; + vcpu->run->s390_ucontrol.trans_exc_code = + current->thread.gmap_addr; + vcpu->run->s390_ucontrol.pgm_code = 0x10; + return -EREMOTE; + } else if (current->thread.gmap_pfault) { + trace_kvm_s390_major_guest_pfault(vcpu); + current->thread.gmap_pfault = 0; + if (kvm_arch_setup_async_pf(vcpu)) + return 0; + vcpu->stat.pfault_sync++; + return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1); + } + return vcpu_post_run_fault_in_sie(vcpu); +} + +#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK) +static int __vcpu_run(struct kvm_vcpu *vcpu) +{ + int rc, exit_reason; + struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block; + + /* + * We try to hold kvm->srcu during most of vcpu_run (except when run- + * ning the guest), so that memslots (and other stuff) are protected + */ + kvm_vcpu_srcu_read_lock(vcpu); + + do { + rc = vcpu_pre_run(vcpu); + if (rc || guestdbg_exit_pending(vcpu)) + break; + + kvm_vcpu_srcu_read_unlock(vcpu); + /* + * As PF_VCPU will be used in fault handler, between + * guest_enter and guest_exit should be no uaccess. + */ + local_irq_disable(); + guest_enter_irqoff(); + __disable_cpu_timer_accounting(vcpu); + local_irq_enable(); + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + memcpy(sie_page->pv_grregs, + vcpu->run->s.regs.gprs, + sizeof(sie_page->pv_grregs)); + } + if (test_cpu_flag(CIF_FPU)) + load_fpu_regs(); + exit_reason = sie64a(vcpu->arch.sie_block, + vcpu->run->s.regs.gprs); + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + memcpy(vcpu->run->s.regs.gprs, + sie_page->pv_grregs, + sizeof(sie_page->pv_grregs)); + /* + * We're not allowed to inject interrupts on intercepts + * that leave the guest state in an "in-between" state + * where the next SIE entry will do a continuation. + * Fence interrupts in our "internal" PSW. + */ + if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR || + vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) { + vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; + } + } + local_irq_disable(); + __enable_cpu_timer_accounting(vcpu); + guest_exit_irqoff(); + local_irq_enable(); + kvm_vcpu_srcu_read_lock(vcpu); + + rc = vcpu_post_run(vcpu, exit_reason); + } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); + + kvm_vcpu_srcu_read_unlock(vcpu); + return rc; +} + +static void sync_regs_fmt2(struct kvm_vcpu *vcpu) +{ + struct kvm_run *kvm_run = vcpu->run; + struct runtime_instr_cb *riccb; + struct gs_cb *gscb; + + riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; + gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; + vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; + vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; + if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { + vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; + vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; + vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; + } + if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { + vcpu->arch.pfault_token = kvm_run->s.regs.pft; + vcpu->arch.pfault_select = kvm_run->s.regs.pfs; + vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; + if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) + kvm_clear_async_pf_completion_queue(vcpu); + } + if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) { + vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318; + vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc; + VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc); + } + /* + * If userspace sets the riccb (e.g. after migration) to a valid state, + * we should enable RI here instead of doing the lazy enablement. + */ + if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && + test_kvm_facility(vcpu->kvm, 64) && + riccb->v && + !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { + VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); + vcpu->arch.sie_block->ecb3 |= ECB3_RI; + } + /* + * If userspace sets the gscb (e.g. after migration) to non-zero, + * we should enable GS here instead of doing the lazy enablement. + */ + if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && + test_kvm_facility(vcpu->kvm, 133) && + gscb->gssm && + !vcpu->arch.gs_enabled) { + VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); + vcpu->arch.sie_block->ecb |= ECB_GS; + vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; + vcpu->arch.gs_enabled = 1; + } + if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && + test_kvm_facility(vcpu->kvm, 82)) { + vcpu->arch.sie_block->fpf &= ~FPF_BPBC; + vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; + } + if (MACHINE_HAS_GS) { + preempt_disable(); + __ctl_set_bit(2, 4); + if (current->thread.gs_cb) { + vcpu->arch.host_gscb = current->thread.gs_cb; + save_gs_cb(vcpu->arch.host_gscb); + } + if (vcpu->arch.gs_enabled) { + current->thread.gs_cb = (struct gs_cb *) + &vcpu->run->s.regs.gscb; + restore_gs_cb(current->thread.gs_cb); + } + preempt_enable(); + } + /* SIE will load etoken directly from SDNX and therefore kvm_run */ +} + +static void sync_regs(struct kvm_vcpu *vcpu) +{ + struct kvm_run *kvm_run = vcpu->run; + + if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) + kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); + if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { + memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); + /* some control register changes require a tlb flush */ + kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + } + if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { + kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); + vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; + } + save_access_regs(vcpu->arch.host_acrs); + restore_access_regs(vcpu->run->s.regs.acrs); + /* save host (userspace) fprs/vrs */ + save_fpu_regs(); + vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc; + vcpu->arch.host_fpregs.regs = current->thread.fpu.regs; + if (MACHINE_HAS_VX) + current->thread.fpu.regs = vcpu->run->s.regs.vrs; + else + current->thread.fpu.regs = vcpu->run->s.regs.fprs; + current->thread.fpu.fpc = vcpu->run->s.regs.fpc; + if (test_fp_ctl(current->thread.fpu.fpc)) + /* User space provided an invalid FPC, let's clear it */ + current->thread.fpu.fpc = 0; + + /* Sync fmt2 only data */ + if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) { + sync_regs_fmt2(vcpu); + } else { + /* + * In several places we have to modify our internal view to + * not do things that are disallowed by the ultravisor. For + * example we must not inject interrupts after specific exits + * (e.g. 112 prefix page not secure). We do this by turning + * off the machine check, external and I/O interrupt bits + * of our PSW copy. To avoid getting validity intercepts, we + * do only accept the condition code from userspace. + */ + vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC; + vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask & + PSW_MASK_CC; + } + + kvm_run->kvm_dirty_regs = 0; +} + +static void store_regs_fmt2(struct kvm_vcpu *vcpu) +{ + struct kvm_run *kvm_run = vcpu->run; + + kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; + kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; + kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; + kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; + kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val; + if (MACHINE_HAS_GS) { + preempt_disable(); + __ctl_set_bit(2, 4); + if (vcpu->arch.gs_enabled) + save_gs_cb(current->thread.gs_cb); + current->thread.gs_cb = vcpu->arch.host_gscb; + restore_gs_cb(vcpu->arch.host_gscb); + if (!vcpu->arch.host_gscb) + __ctl_clear_bit(2, 4); + vcpu->arch.host_gscb = NULL; + preempt_enable(); + } + /* SIE will save etoken directly into SDNX and therefore kvm_run */ +} + +static void store_regs(struct kvm_vcpu *vcpu) +{ + struct kvm_run *kvm_run = vcpu->run; + + kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; + kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; + kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); + memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); + kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); + kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; + kvm_run->s.regs.pft = vcpu->arch.pfault_token; + kvm_run->s.regs.pfs = vcpu->arch.pfault_select; + kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; + save_access_regs(vcpu->run->s.regs.acrs); + restore_access_regs(vcpu->arch.host_acrs); + /* Save guest register state */ + save_fpu_regs(); + vcpu->run->s.regs.fpc = current->thread.fpu.fpc; + /* Restore will be done lazily at return */ + current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc; + current->thread.fpu.regs = vcpu->arch.host_fpregs.regs; + if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) + store_regs_fmt2(vcpu); +} + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) +{ + struct kvm_run *kvm_run = vcpu->run; + int rc; + + /* + * Running a VM while dumping always has the potential to + * produce inconsistent dump data. But for PV vcpus a SIE + * entry while dumping could also lead to a fatal validity + * intercept which we absolutely want to avoid. + */ + if (vcpu->kvm->arch.pv.dumping) + return -EINVAL; + + if (kvm_run->immediate_exit) + return -EINTR; + + if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS || + kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS) + return -EINVAL; + + vcpu_load(vcpu); + + if (guestdbg_exit_pending(vcpu)) { + kvm_s390_prepare_debug_exit(vcpu); + rc = 0; + goto out; + } + + kvm_sigset_activate(vcpu); + + /* + * no need to check the return value of vcpu_start as it can only have + * an error for protvirt, but protvirt means user cpu state + */ + if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { + kvm_s390_vcpu_start(vcpu); + } else if (is_vcpu_stopped(vcpu)) { + pr_err_ratelimited("can't run stopped vcpu %d\n", + vcpu->vcpu_id); + rc = -EINVAL; + goto out; + } + + sync_regs(vcpu); + enable_cpu_timer_accounting(vcpu); + + might_fault(); + rc = __vcpu_run(vcpu); + + if (signal_pending(current) && !rc) { + kvm_run->exit_reason = KVM_EXIT_INTR; + rc = -EINTR; + } + + if (guestdbg_exit_pending(vcpu) && !rc) { + kvm_s390_prepare_debug_exit(vcpu); + rc = 0; + } + + if (rc == -EREMOTE) { + /* userspace support is needed, kvm_run has been prepared */ + rc = 0; + } + + disable_cpu_timer_accounting(vcpu); + store_regs(vcpu); + + kvm_sigset_deactivate(vcpu); + + vcpu->stat.exit_userspace++; +out: + vcpu_put(vcpu); + return rc; +} + +/* + * store status at address + * we use have two special cases: + * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit + * KVM_S390_STORE_STATUS_PREFIXED: -> prefix + */ +int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) +{ + unsigned char archmode = 1; + freg_t fprs[NUM_FPRS]; + unsigned int px; + u64 clkcomp, cputm; + int rc; + + px = kvm_s390_get_prefix(vcpu); + if (gpa == KVM_S390_STORE_STATUS_NOADDR) { + if (write_guest_abs(vcpu, 163, &archmode, 1)) + return -EFAULT; + gpa = 0; + } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { + if (write_guest_real(vcpu, 163, &archmode, 1)) + return -EFAULT; + gpa = px; + } else + gpa -= __LC_FPREGS_SAVE_AREA; + + /* manually convert vector registers if necessary */ + if (MACHINE_HAS_VX) { + convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); + rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, + fprs, 128); + } else { + rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, + vcpu->run->s.regs.fprs, 128); + } + rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, + vcpu->run->s.regs.gprs, 128); + rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, + &vcpu->arch.sie_block->gpsw, 16); + rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, + &px, 4); + rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, + &vcpu->run->s.regs.fpc, 4); + rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, + &vcpu->arch.sie_block->todpr, 4); + cputm = kvm_s390_get_cpu_timer(vcpu); + rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, + &cputm, 8); + clkcomp = vcpu->arch.sie_block->ckc >> 8; + rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, + &clkcomp, 8); + rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, + &vcpu->run->s.regs.acrs, 64); + rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, + &vcpu->arch.sie_block->gcr, 128); + return rc ? -EFAULT : 0; +} + +int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) +{ + /* + * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy + * switch in the run ioctl. Let's update our copies before we save + * it into the save area + */ + save_fpu_regs(); + vcpu->run->s.regs.fpc = current->thread.fpu.fpc; + save_access_regs(vcpu->run->s.regs.acrs); + + return kvm_s390_store_status_unloaded(vcpu, addr); +} + +static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) +{ + kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); + kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); +} + +static void __disable_ibs_on_all_vcpus(struct kvm *kvm) +{ + unsigned long i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) { + __disable_ibs_on_vcpu(vcpu); + } +} + +static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) +{ + if (!sclp.has_ibs) + return; + kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); + kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); +} + +int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) +{ + int i, online_vcpus, r = 0, started_vcpus = 0; + + if (!is_vcpu_stopped(vcpu)) + return 0; + + trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); + /* Only one cpu at a time may enter/leave the STOPPED state. */ + spin_lock(&vcpu->kvm->arch.start_stop_lock); + online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); + + /* Let's tell the UV that we want to change into the operating state */ + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR); + if (r) { + spin_unlock(&vcpu->kvm->arch.start_stop_lock); + return r; + } + } + + for (i = 0; i < online_vcpus; i++) { + if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i))) + started_vcpus++; + } + + if (started_vcpus == 0) { + /* we're the only active VCPU -> speed it up */ + __enable_ibs_on_vcpu(vcpu); + } else if (started_vcpus == 1) { + /* + * As we are starting a second VCPU, we have to disable + * the IBS facility on all VCPUs to remove potentially + * outstanding ENABLE requests. + */ + __disable_ibs_on_all_vcpus(vcpu->kvm); + } + + kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); + /* + * The real PSW might have changed due to a RESTART interpreted by the + * ultravisor. We block all interrupts and let the next sie exit + * refresh our view. + */ + if (kvm_s390_pv_cpu_is_protected(vcpu)) + vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; + /* + * Another VCPU might have used IBS while we were offline. + * Let's play safe and flush the VCPU at startup. + */ + kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); + spin_unlock(&vcpu->kvm->arch.start_stop_lock); + return 0; +} + +int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) +{ + int i, online_vcpus, r = 0, started_vcpus = 0; + struct kvm_vcpu *started_vcpu = NULL; + + if (is_vcpu_stopped(vcpu)) + return 0; + + trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); + /* Only one cpu at a time may enter/leave the STOPPED state. */ + spin_lock(&vcpu->kvm->arch.start_stop_lock); + online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); + + /* Let's tell the UV that we want to change into the stopped state */ + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP); + if (r) { + spin_unlock(&vcpu->kvm->arch.start_stop_lock); + return r; + } + } + + /* + * Set the VCPU to STOPPED and THEN clear the interrupt flag, + * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders + * have been fully processed. This will ensure that the VCPU + * is kept BUSY if another VCPU is inquiring with SIGP SENSE. + */ + kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); + kvm_s390_clear_stop_irq(vcpu); + + __disable_ibs_on_vcpu(vcpu); + + for (i = 0; i < online_vcpus; i++) { + struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i); + + if (!is_vcpu_stopped(tmp)) { + started_vcpus++; + started_vcpu = tmp; + } + } + + if (started_vcpus == 1) { + /* + * As we only have one VCPU left, we want to enable the + * IBS facility for that VCPU to speed it up. + */ + __enable_ibs_on_vcpu(started_vcpu); + } + + spin_unlock(&vcpu->kvm->arch.start_stop_lock); + return 0; +} + +static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, + struct kvm_enable_cap *cap) +{ + int r; + + if (cap->flags) + return -EINVAL; + + switch (cap->cap) { + case KVM_CAP_S390_CSS_SUPPORT: + if (!vcpu->kvm->arch.css_support) { + vcpu->kvm->arch.css_support = 1; + VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); + trace_kvm_s390_enable_css(vcpu->kvm); + } + r = 0; + break; + default: + r = -EINVAL; + break; + } + return r; +} + +static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, + struct kvm_s390_mem_op *mop) +{ + void __user *uaddr = (void __user *)mop->buf; + void *sida_addr; + int r = 0; + + if (mop->flags || !mop->size) + return -EINVAL; + if (mop->size + mop->sida_offset < mop->size) + return -EINVAL; + if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block)) + return -E2BIG; + if (!kvm_s390_pv_cpu_is_protected(vcpu)) + return -EINVAL; + + sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset; + + switch (mop->op) { + case KVM_S390_MEMOP_SIDA_READ: + if (copy_to_user(uaddr, sida_addr, mop->size)) + r = -EFAULT; + + break; + case KVM_S390_MEMOP_SIDA_WRITE: + if (copy_from_user(sida_addr, uaddr, mop->size)) + r = -EFAULT; + break; + } + return r; +} + +static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu, + struct kvm_s390_mem_op *mop) +{ + void __user *uaddr = (void __user *)mop->buf; + enum gacc_mode acc_mode; + void *tmpbuf = NULL; + int r; + + r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION | + KVM_S390_MEMOP_F_CHECK_ONLY | + KVM_S390_MEMOP_F_SKEY_PROTECTION); + if (r) + return r; + if (mop->ar >= NUM_ACRS) + return -EINVAL; + if (kvm_s390_pv_cpu_is_protected(vcpu)) + return -EINVAL; + if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { + tmpbuf = vmalloc(mop->size); + if (!tmpbuf) + return -ENOMEM; + } + + acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE; + if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { + r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, + acc_mode, mop->key); + goto out_inject; + } + if (acc_mode == GACC_FETCH) { + r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, + mop->size, mop->key); + if (r) + goto out_inject; + if (copy_to_user(uaddr, tmpbuf, mop->size)) { + r = -EFAULT; + goto out_free; + } + } else { + if (copy_from_user(tmpbuf, uaddr, mop->size)) { + r = -EFAULT; + goto out_free; + } + r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, + mop->size, mop->key); + } + +out_inject: + if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) + kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); + +out_free: + vfree(tmpbuf); + return r; +} + +static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu, + struct kvm_s390_mem_op *mop) +{ + int r, srcu_idx; + + srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + + switch (mop->op) { + case KVM_S390_MEMOP_LOGICAL_READ: + case KVM_S390_MEMOP_LOGICAL_WRITE: + r = kvm_s390_vcpu_mem_op(vcpu, mop); + break; + case KVM_S390_MEMOP_SIDA_READ: + case KVM_S390_MEMOP_SIDA_WRITE: + /* we are locked against sida going away by the vcpu->mutex */ + r = kvm_s390_vcpu_sida_op(vcpu, mop); + break; + default: + r = -EINVAL; + } + + srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); + return r; +} + +long kvm_arch_vcpu_async_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = (void __user *)arg; + int rc; + + switch (ioctl) { + case KVM_S390_IRQ: { + struct kvm_s390_irq s390irq; + + if (copy_from_user(&s390irq, argp, sizeof(s390irq))) + return -EFAULT; + rc = kvm_s390_inject_vcpu(vcpu, &s390irq); + break; + } + case KVM_S390_INTERRUPT: { + struct kvm_s390_interrupt s390int; + struct kvm_s390_irq s390irq = {}; + + if (copy_from_user(&s390int, argp, sizeof(s390int))) + return -EFAULT; + if (s390int_to_s390irq(&s390int, &s390irq)) + return -EINVAL; + rc = kvm_s390_inject_vcpu(vcpu, &s390irq); + break; + } + default: + rc = -ENOIOCTLCMD; + break; + } + + /* + * To simplify single stepping of userspace-emulated instructions, + * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see + * should_handle_per_ifetch()). However, if userspace emulation injects + * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens + * after (and not before) the interrupt delivery. + */ + if (!rc) + vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING; + + return rc; +} + +static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu, + struct kvm_pv_cmd *cmd) +{ + struct kvm_s390_pv_dmp dmp; + void *data; + int ret; + + /* Dump initialization is a prerequisite */ + if (!vcpu->kvm->arch.pv.dumping) + return -EINVAL; + + if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp))) + return -EFAULT; + + /* We only handle this subcmd right now */ + if (dmp.subcmd != KVM_PV_DUMP_CPU) + return -EINVAL; + + /* CPU dump length is the same as create cpu storage donation. */ + if (dmp.buff_len != uv_info.guest_cpu_stor_len) + return -EINVAL; + + data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL); + if (!data) + return -ENOMEM; + + ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc); + + VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x", + vcpu->vcpu_id, cmd->rc, cmd->rrc); + + if (ret) + ret = -EINVAL; + + /* On success copy over the dump data */ + if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len)) + ret = -EFAULT; + + kvfree(data); + return ret; +} + +long kvm_arch_vcpu_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = (void __user *)arg; + int idx; + long r; + u16 rc, rrc; + + vcpu_load(vcpu); + + switch (ioctl) { + case KVM_S390_STORE_STATUS: + idx = srcu_read_lock(&vcpu->kvm->srcu); + r = kvm_s390_store_status_unloaded(vcpu, arg); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + break; + case KVM_S390_SET_INITIAL_PSW: { + psw_t psw; + + r = -EFAULT; + if (copy_from_user(&psw, argp, sizeof(psw))) + break; + r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); + break; + } + case KVM_S390_CLEAR_RESET: + r = 0; + kvm_arch_vcpu_ioctl_clear_reset(vcpu); + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), + UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc); + VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x", + rc, rrc); + } + break; + case KVM_S390_INITIAL_RESET: + r = 0; + kvm_arch_vcpu_ioctl_initial_reset(vcpu); + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), + UVC_CMD_CPU_RESET_INITIAL, + &rc, &rrc); + VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x", + rc, rrc); + } + break; + case KVM_S390_NORMAL_RESET: + r = 0; + kvm_arch_vcpu_ioctl_normal_reset(vcpu); + if (kvm_s390_pv_cpu_is_protected(vcpu)) { + r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), + UVC_CMD_CPU_RESET, &rc, &rrc); + VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x", + rc, rrc); + } + break; + case KVM_SET_ONE_REG: + case KVM_GET_ONE_REG: { + struct kvm_one_reg reg; + r = -EINVAL; + if (kvm_s390_pv_cpu_is_protected(vcpu)) + break; + r = -EFAULT; + if (copy_from_user(®, argp, sizeof(reg))) + break; + if (ioctl == KVM_SET_ONE_REG) + r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); + else + r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); + break; + } +#ifdef CONFIG_KVM_S390_UCONTROL + case KVM_S390_UCAS_MAP: { + struct kvm_s390_ucas_mapping ucasmap; + + if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { + r = -EFAULT; + break; + } + + if (!kvm_is_ucontrol(vcpu->kvm)) { + r = -EINVAL; + break; + } + + r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, + ucasmap.vcpu_addr, ucasmap.length); + break; + } + case KVM_S390_UCAS_UNMAP: { + struct kvm_s390_ucas_mapping ucasmap; + + if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { + r = -EFAULT; + break; + } + + if (!kvm_is_ucontrol(vcpu->kvm)) { + r = -EINVAL; + break; + } + + r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, + ucasmap.length); + break; + } +#endif + case KVM_S390_VCPU_FAULT: { + r = gmap_fault(vcpu->arch.gmap, arg, 0); + break; + } + case KVM_ENABLE_CAP: + { + struct kvm_enable_cap cap; + r = -EFAULT; + if (copy_from_user(&cap, argp, sizeof(cap))) + break; + r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); + break; + } + case KVM_S390_MEM_OP: { + struct kvm_s390_mem_op mem_op; + + if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) + r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op); + else + r = -EFAULT; + break; + } + case KVM_S390_SET_IRQ_STATE: { + struct kvm_s390_irq_state irq_state; + + r = -EFAULT; + if (copy_from_user(&irq_state, argp, sizeof(irq_state))) + break; + if (irq_state.len > VCPU_IRQS_MAX_BUF || + irq_state.len == 0 || + irq_state.len % sizeof(struct kvm_s390_irq) > 0) { + r = -EINVAL; + break; + } + /* do not use irq_state.flags, it will break old QEMUs */ + r = kvm_s390_set_irq_state(vcpu, + (void __user *) irq_state.buf, + irq_state.len); + break; + } + case KVM_S390_GET_IRQ_STATE: { + struct kvm_s390_irq_state irq_state; + + r = -EFAULT; + if (copy_from_user(&irq_state, argp, sizeof(irq_state))) + break; + if (irq_state.len == 0) { + r = -EINVAL; + break; + } + /* do not use irq_state.flags, it will break old QEMUs */ + r = kvm_s390_get_irq_state(vcpu, + (__u8 __user *) irq_state.buf, + irq_state.len); + break; + } + case KVM_S390_PV_CPU_COMMAND: { + struct kvm_pv_cmd cmd; + + r = -EINVAL; + if (!is_prot_virt_host()) + break; + + r = -EFAULT; + if (copy_from_user(&cmd, argp, sizeof(cmd))) + break; + + r = -EINVAL; + if (cmd.flags) + break; + + /* We only handle this cmd right now */ + if (cmd.cmd != KVM_PV_DUMP) + break; + + r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd); + + /* Always copy over UV rc / rrc data */ + if (copy_to_user((__u8 __user *)argp, &cmd.rc, + sizeof(cmd.rc) + sizeof(cmd.rrc))) + r = -EFAULT; + break; + } + default: + r = -ENOTTY; + } + + vcpu_put(vcpu); + return r; +} + +vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) +{ +#ifdef CONFIG_KVM_S390_UCONTROL + if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) + && (kvm_is_ucontrol(vcpu->kvm))) { + vmf->page = virt_to_page(vcpu->arch.sie_block); + get_page(vmf->page); + return 0; + } +#endif + return VM_FAULT_SIGBUS; +} + +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) +{ + return true; +} + +/* Section: memory related */ +int kvm_arch_prepare_memory_region(struct kvm *kvm, + const struct kvm_memory_slot *old, + struct kvm_memory_slot *new, + enum kvm_mr_change change) +{ + gpa_t size; + + /* When we are protected, we should not change the memory slots */ + if (kvm_s390_pv_get_handle(kvm)) + return -EINVAL; + + if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) { + /* + * A few sanity checks. We can have memory slots which have to be + * located/ended at a segment boundary (1MB). The memory in userland is + * ok to be fragmented into various different vmas. It is okay to mmap() + * and munmap() stuff in this slot after doing this call at any time + */ + + if (new->userspace_addr & 0xffffful) + return -EINVAL; + + size = new->npages * PAGE_SIZE; + if (size & 0xffffful) + return -EINVAL; + + if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit) + return -EINVAL; + } + + if (!kvm->arch.migration_mode) + return 0; + + /* + * Turn off migration mode when: + * - userspace creates a new memslot with dirty logging off, + * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and + * dirty logging is turned off. + * Migration mode expects dirty page logging being enabled to store + * its dirty bitmap. + */ + if (change != KVM_MR_DELETE && + !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) + WARN(kvm_s390_vm_stop_migration(kvm), + "Failed to stop migration mode"); + + return 0; +} + +void kvm_arch_commit_memory_region(struct kvm *kvm, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) +{ + int rc = 0; + + switch (change) { + case KVM_MR_DELETE: + rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, + old->npages * PAGE_SIZE); + break; + case KVM_MR_MOVE: + rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, + old->npages * PAGE_SIZE); + if (rc) + break; + fallthrough; + case KVM_MR_CREATE: + rc = gmap_map_segment(kvm->arch.gmap, new->userspace_addr, + new->base_gfn * PAGE_SIZE, + new->npages * PAGE_SIZE); + break; + case KVM_MR_FLAGS_ONLY: + break; + default: + WARN(1, "Unknown KVM MR CHANGE: %d\n", change); + } + if (rc) + pr_warn("failed to commit memory region\n"); + return; +} + +static inline unsigned long nonhyp_mask(int i) +{ + unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; + + return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); +} + +static int __init kvm_s390_init(void) +{ + int i, r; + + if (!sclp.has_sief2) { + pr_info("SIE is not available\n"); + return -ENODEV; + } + + if (nested && hpage) { + pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n"); + return -EINVAL; + } + + for (i = 0; i < 16; i++) + kvm_s390_fac_base[i] |= + stfle_fac_list[i] & nonhyp_mask(i); + + r = __kvm_s390_init(); + if (r) + return r; + + r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); + if (r) { + __kvm_s390_exit(); + return r; + } + return 0; +} + +static void __exit kvm_s390_exit(void) +{ + kvm_exit(); + + __kvm_s390_exit(); +} + +module_init(kvm_s390_init); +module_exit(kvm_s390_exit); + +/* + * Enable autoloading of the kvm module. + * Note that we add the module alias here instead of virt/kvm/kvm_main.c + * since x86 takes a different approach. + */ +#include <linux/miscdevice.h> +MODULE_ALIAS_MISCDEV(KVM_MINOR); +MODULE_ALIAS("devname:kvm"); |