/* * ARM implementation of KVM hooks * * Copyright Christoffer Dall 2009-2010 * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include #include #include "qemu/timer.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" #include "qom/object.h" #include "qapi/error.h" #include "sysemu/sysemu.h" #include "sysemu/kvm.h" #include "sysemu/kvm_int.h" #include "kvm_arm.h" #include "cpu.h" #include "trace.h" #include "internals.h" #include "hw/pci/pci.h" #include "exec/memattrs.h" #include "exec/address-spaces.h" #include "hw/boards.h" #include "hw/irq.h" #include "qapi/visitor.h" #include "qemu/log.h" const KVMCapabilityInfo kvm_arch_required_capabilities[] = { KVM_CAP_LAST_INFO }; static bool cap_has_mp_state; static bool cap_has_inject_serror_esr; static bool cap_has_inject_ext_dabt; /** * ARMHostCPUFeatures: information about the host CPU (identified * by asking the host kernel) */ typedef struct ARMHostCPUFeatures { ARMISARegisters isar; uint64_t features; uint32_t target; const char *dtb_compatible; } ARMHostCPUFeatures; static ARMHostCPUFeatures arm_host_cpu_features; int kvm_arm_vcpu_init(CPUState *cs) { ARMCPU *cpu = ARM_CPU(cs); struct kvm_vcpu_init init; init.target = cpu->kvm_target; memcpy(init.features, cpu->kvm_init_features, sizeof(init.features)); return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init); } int kvm_arm_vcpu_finalize(CPUState *cs, int feature) { return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_FINALIZE, &feature); } void kvm_arm_init_serror_injection(CPUState *cs) { cap_has_inject_serror_esr = kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_INJECT_SERROR_ESR); } bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try, int *fdarray, struct kvm_vcpu_init *init) { int ret = 0, kvmfd = -1, vmfd = -1, cpufd = -1; int max_vm_pa_size; kvmfd = qemu_open_old("/dev/kvm", O_RDWR); if (kvmfd < 0) { goto err; } max_vm_pa_size = ioctl(kvmfd, KVM_CHECK_EXTENSION, KVM_CAP_ARM_VM_IPA_SIZE); if (max_vm_pa_size < 0) { max_vm_pa_size = 0; } do { vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size); } while (vmfd == -1 && errno == EINTR); if (vmfd < 0) { goto err; } cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0); if (cpufd < 0) { goto err; } if (!init) { /* Caller doesn't want the VCPU to be initialized, so skip it */ goto finish; } if (init->target == -1) { struct kvm_vcpu_init preferred; ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, &preferred); if (!ret) { init->target = preferred.target; } } if (ret >= 0) { ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init); if (ret < 0) { goto err; } } else if (cpus_to_try) { /* Old kernel which doesn't know about the * PREFERRED_TARGET ioctl: we know it will only support * creating one kind of guest CPU which is its preferred * CPU type. */ struct kvm_vcpu_init try; while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) { try.target = *cpus_to_try++; memcpy(try.features, init->features, sizeof(init->features)); ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, &try); if (ret >= 0) { break; } } if (ret < 0) { goto err; } init->target = try.target; } else { /* Treat a NULL cpus_to_try argument the same as an empty * list, which means we will fail the call since this must * be an old kernel which doesn't support PREFERRED_TARGET. */ goto err; } finish: fdarray[0] = kvmfd; fdarray[1] = vmfd; fdarray[2] = cpufd; return true; err: if (cpufd >= 0) { close(cpufd); } if (vmfd >= 0) { close(vmfd); } if (kvmfd >= 0) { close(kvmfd); } return false; } void kvm_arm_destroy_scratch_host_vcpu(int *fdarray) { int i; for (i = 2; i >= 0; i--) { close(fdarray[i]); } } static int read_sys_reg32(int fd, uint32_t *pret, uint64_t id) { uint64_t ret; struct kvm_one_reg idreg = { .id = id, .addr = (uintptr_t)&ret }; int err; assert((id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64); err = ioctl(fd, KVM_GET_ONE_REG, &idreg); if (err < 0) { return -1; } *pret = ret; return 0; } static int read_sys_reg64(int fd, uint64_t *pret, uint64_t id) { struct kvm_one_reg idreg = { .id = id, .addr = (uintptr_t)pret }; assert((id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64); return ioctl(fd, KVM_GET_ONE_REG, &idreg); } static bool kvm_arm_pauth_supported(void) { return (kvm_check_extension(kvm_state, KVM_CAP_ARM_PTRAUTH_ADDRESS) && kvm_check_extension(kvm_state, KVM_CAP_ARM_PTRAUTH_GENERIC)); } static bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) { /* Identify the feature bits corresponding to the host CPU, and * fill out the ARMHostCPUClass fields accordingly. To do this * we have to create a scratch VM, create a single CPU inside it, * and then query that CPU for the relevant ID registers. */ int fdarray[3]; bool sve_supported; bool pmu_supported = false; uint64_t features = 0; int err; /* Old kernels may not know about the PREFERRED_TARGET ioctl: however * we know these will only support creating one kind of guest CPU, * which is its preferred CPU type. Fortunately these old kernels * support only a very limited number of CPUs. */ static const uint32_t cpus_to_try[] = { KVM_ARM_TARGET_AEM_V8, KVM_ARM_TARGET_FOUNDATION_V8, KVM_ARM_TARGET_CORTEX_A57, QEMU_KVM_ARM_TARGET_NONE }; /* * target = -1 informs kvm_arm_create_scratch_host_vcpu() * to use the preferred target */ struct kvm_vcpu_init init = { .target = -1, }; /* * Ask for SVE if supported, so that we can query ID_AA64ZFR0, * which is otherwise RAZ. */ sve_supported = kvm_arm_sve_supported(); if (sve_supported) { init.features[0] |= 1 << KVM_ARM_VCPU_SVE; } /* * Ask for Pointer Authentication if supported, so that we get * the unsanitized field values for AA64ISAR1_EL1. */ if (kvm_arm_pauth_supported()) { init.features[0] |= (1 << KVM_ARM_VCPU_PTRAUTH_ADDRESS | 1 << KVM_ARM_VCPU_PTRAUTH_GENERIC); } if (kvm_arm_pmu_supported()) { init.features[0] |= 1 << KVM_ARM_VCPU_PMU_V3; pmu_supported = true; } if (!kvm_arm_create_scratch_host_vcpu(cpus_to_try, fdarray, &init)) { return false; } ahcf->target = init.target; ahcf->dtb_compatible = "arm,arm-v8"; err = read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr0, ARM64_SYS_REG(3, 0, 0, 4, 0)); if (unlikely(err < 0)) { /* * Before v4.15, the kernel only exposed a limited number of system * registers, not including any of the interesting AArch64 ID regs. * For the most part we could leave these fields as zero with minimal * effect, since this does not affect the values seen by the guest. * * However, it could cause problems down the line for QEMU, * so provide a minimal v8.0 default. * * ??? Could read MIDR and use knowledge from cpu64.c. * ??? Could map a page of memory into our temp guest and * run the tiniest of hand-crafted kernels to extract * the values seen by the guest. * ??? Either of these sounds like too much effort just * to work around running a modern host kernel. */ ahcf->isar.id_aa64pfr0 = 0x00000011; /* EL1&0, AArch64 only */ err = 0; } else { err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr1, ARM64_SYS_REG(3, 0, 0, 4, 1)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64smfr0, ARM64_SYS_REG(3, 0, 0, 4, 5)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr0, ARM64_SYS_REG(3, 0, 0, 5, 0)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr1, ARM64_SYS_REG(3, 0, 0, 5, 1)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar0, ARM64_SYS_REG(3, 0, 0, 6, 0)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar1, ARM64_SYS_REG(3, 0, 0, 6, 1)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar2, ARM64_SYS_REG(3, 0, 0, 6, 2)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr0, ARM64_SYS_REG(3, 0, 0, 7, 0)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr1, ARM64_SYS_REG(3, 0, 0, 7, 1)); err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr2, ARM64_SYS_REG(3, 0, 0, 7, 2)); /* * Note that if AArch32 support is not present in the host, * the AArch32 sysregs are present to be read, but will * return UNKNOWN values. This is neither better nor worse * than skipping the reads and leaving 0, as we must avoid * considering the values in every case. */ err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr0, ARM64_SYS_REG(3, 0, 0, 1, 0)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr1, ARM64_SYS_REG(3, 0, 0, 1, 1)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_dfr0, ARM64_SYS_REG(3, 0, 0, 1, 2)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr0, ARM64_SYS_REG(3, 0, 0, 1, 4)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr1, ARM64_SYS_REG(3, 0, 0, 1, 5)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr2, ARM64_SYS_REG(3, 0, 0, 1, 6)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr3, ARM64_SYS_REG(3, 0, 0, 1, 7)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar0, ARM64_SYS_REG(3, 0, 0, 2, 0)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar1, ARM64_SYS_REG(3, 0, 0, 2, 1)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar2, ARM64_SYS_REG(3, 0, 0, 2, 2)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar3, ARM64_SYS_REG(3, 0, 0, 2, 3)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar4, ARM64_SYS_REG(3, 0, 0, 2, 4)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar5, ARM64_SYS_REG(3, 0, 0, 2, 5)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr4, ARM64_SYS_REG(3, 0, 0, 2, 6)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar6, ARM64_SYS_REG(3, 0, 0, 2, 7)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr0, ARM64_SYS_REG(3, 0, 0, 3, 0)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr1, ARM64_SYS_REG(3, 0, 0, 3, 1)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr2, ARM64_SYS_REG(3, 0, 0, 3, 2)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr2, ARM64_SYS_REG(3, 0, 0, 3, 4)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_dfr1, ARM64_SYS_REG(3, 0, 0, 3, 5)); err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr5, ARM64_SYS_REG(3, 0, 0, 3, 6)); /* * DBGDIDR is a bit complicated because the kernel doesn't * provide an accessor for it in 64-bit mode, which is what this * scratch VM is in, and there's no architected "64-bit sysreg * which reads the same as the 32-bit register" the way there is * for other ID registers. Instead we synthesize a value from the * AArch64 ID_AA64DFR0, the same way the kernel code in * arch/arm64/kvm/sys_regs.c:trap_dbgidr() does. * We only do this if the CPU supports AArch32 at EL1. */ if (FIELD_EX32(ahcf->isar.id_aa64pfr0, ID_AA64PFR0, EL1) >= 2) { int wrps = FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, WRPS); int brps = FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, BRPS); int ctx_cmps = FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, CTX_CMPS); int version = 6; /* ARMv8 debug architecture */ bool has_el3 = !!FIELD_EX32(ahcf->isar.id_aa64pfr0, ID_AA64PFR0, EL3); uint32_t dbgdidr = 0; dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, WRPS, wrps); dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, BRPS, brps); dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, CTX_CMPS, ctx_cmps); dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, VERSION, version); dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, NSUHD_IMP, has_el3); dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, SE_IMP, has_el3); dbgdidr |= (1 << 15); /* RES1 bit */ ahcf->isar.dbgdidr = dbgdidr; } if (pmu_supported) { /* PMCR_EL0 is only accessible if the vCPU has feature PMU_V3 */ err |= read_sys_reg64(fdarray[2], &ahcf->isar.reset_pmcr_el0, ARM64_SYS_REG(3, 3, 9, 12, 0)); } if (sve_supported) { /* * There is a range of kernels between kernel commit 73433762fcae * and f81cb2c3ad41 which have a bug where the kernel doesn't * expose SYS_ID_AA64ZFR0_EL1 via the ONE_REG API unless the VM has * enabled SVE support, which resulted in an error rather than RAZ. * So only read the register if we set KVM_ARM_VCPU_SVE above. */ err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64zfr0, ARM64_SYS_REG(3, 0, 0, 4, 4)); } } kvm_arm_destroy_scratch_host_vcpu(fdarray); if (err < 0) { return false; } /* * We can assume any KVM supporting CPU is at least a v8 * with VFPv4+Neon; this in turn implies most of the other * feature bits. */ features |= 1ULL << ARM_FEATURE_V8; features |= 1ULL << ARM_FEATURE_NEON; features |= 1ULL << ARM_FEATURE_AARCH64; features |= 1ULL << ARM_FEATURE_PMU; features |= 1ULL << ARM_FEATURE_GENERIC_TIMER; ahcf->features = features; return true; } void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu) { CPUARMState *env = &cpu->env; if (!arm_host_cpu_features.dtb_compatible) { if (!kvm_enabled() || !kvm_arm_get_host_cpu_features(&arm_host_cpu_features)) { /* We can't report this error yet, so flag that we need to * in arm_cpu_realizefn(). */ cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE; cpu->host_cpu_probe_failed = true; return; } } cpu->kvm_target = arm_host_cpu_features.target; cpu->dtb_compatible = arm_host_cpu_features.dtb_compatible; cpu->isar = arm_host_cpu_features.isar; env->features = arm_host_cpu_features.features; } static bool kvm_no_adjvtime_get(Object *obj, Error **errp) { return !ARM_CPU(obj)->kvm_adjvtime; } static void kvm_no_adjvtime_set(Object *obj, bool value, Error **errp) { ARM_CPU(obj)->kvm_adjvtime = !value; } static bool kvm_steal_time_get(Object *obj, Error **errp) { return ARM_CPU(obj)->kvm_steal_time != ON_OFF_AUTO_OFF; } static void kvm_steal_time_set(Object *obj, bool value, Error **errp) { ARM_CPU(obj)->kvm_steal_time = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; } /* KVM VCPU properties should be prefixed with "kvm-". */ void kvm_arm_add_vcpu_properties(Object *obj) { ARMCPU *cpu = ARM_CPU(obj); CPUARMState *env = &cpu->env; if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) { cpu->kvm_adjvtime = true; object_property_add_bool(obj, "kvm-no-adjvtime", kvm_no_adjvtime_get, kvm_no_adjvtime_set); object_property_set_description(obj, "kvm-no-adjvtime", "Set on to disable the adjustment of " "the virtual counter. VM stopped time " "will be counted."); } cpu->kvm_steal_time = ON_OFF_AUTO_AUTO; object_property_add_bool(obj, "kvm-steal-time", kvm_steal_time_get, kvm_steal_time_set); object_property_set_description(obj, "kvm-steal-time", "Set off to disable KVM steal time."); } bool kvm_arm_pmu_supported(void) { return kvm_check_extension(kvm_state, KVM_CAP_ARM_PMU_V3); } int kvm_arm_get_max_vm_ipa_size(MachineState *ms, bool *fixed_ipa) { KVMState *s = KVM_STATE(ms->accelerator); int ret; ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE); *fixed_ipa = ret <= 0; return ret > 0 ? ret : 40; } int kvm_arch_get_default_type(MachineState *ms) { bool fixed_ipa; int size = kvm_arm_get_max_vm_ipa_size(ms, &fixed_ipa); return fixed_ipa ? 0 : size; } int kvm_arch_init(MachineState *ms, KVMState *s) { int ret = 0; /* For ARM interrupt delivery is always asynchronous, * whether we are using an in-kernel VGIC or not. */ kvm_async_interrupts_allowed = true; /* * PSCI wakes up secondary cores, so we always need to * have vCPUs waiting in kernel space */ kvm_halt_in_kernel_allowed = true; cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE); if (ms->smp.cpus > 256 && !kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) { error_report("Using more than 256 vcpus requires a host kernel " "with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2"); ret = -EINVAL; } if (kvm_check_extension(s, KVM_CAP_ARM_NISV_TO_USER)) { if (kvm_vm_enable_cap(s, KVM_CAP_ARM_NISV_TO_USER, 0)) { error_report("Failed to enable KVM_CAP_ARM_NISV_TO_USER cap"); } else { /* Set status for supporting the external dabt injection */ cap_has_inject_ext_dabt = kvm_check_extension(s, KVM_CAP_ARM_INJECT_EXT_DABT); } } if (s->kvm_eager_split_size) { uint32_t sizes; sizes = kvm_vm_check_extension(s, KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES); if (!sizes) { s->kvm_eager_split_size = 0; warn_report("Eager Page Split support not available"); } else if (!(s->kvm_eager_split_size & sizes)) { error_report("Eager Page Split requested chunk size not valid"); ret = -EINVAL; } else { ret = kvm_vm_enable_cap(s, KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE, 0, s->kvm_eager_split_size); if (ret < 0) { error_report("Enabling of Eager Page Split failed: %s", strerror(-ret)); } } } max_hw_wps = kvm_check_extension(s, KVM_CAP_GUEST_DEBUG_HW_WPS); hw_watchpoints = g_array_sized_new(true, true, sizeof(HWWatchpoint), max_hw_wps); max_hw_bps = kvm_check_extension(s, KVM_CAP_GUEST_DEBUG_HW_BPS); hw_breakpoints = g_array_sized_new(true, true, sizeof(HWBreakpoint), max_hw_bps); return ret; } unsigned long kvm_arch_vcpu_id(CPUState *cpu) { return cpu->cpu_index; } /* We track all the KVM devices which need their memory addresses * passing to the kernel in a list of these structures. * When board init is complete we run through the list and * tell the kernel the base addresses of the memory regions. * We use a MemoryListener to track mapping and unmapping of * the regions during board creation, so the board models don't * need to do anything special for the KVM case. * * Sometimes the address must be OR'ed with some other fields * (for example for KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION). * @kda_addr_ormask aims at storing the value of those fields. */ typedef struct KVMDevice { struct kvm_arm_device_addr kda; struct kvm_device_attr kdattr; uint64_t kda_addr_ormask; MemoryRegion *mr; QSLIST_ENTRY(KVMDevice) entries; int dev_fd; } KVMDevice; static QSLIST_HEAD(, KVMDevice) kvm_devices_head; static void kvm_arm_devlistener_add(MemoryListener *listener, MemoryRegionSection *section) { KVMDevice *kd; QSLIST_FOREACH(kd, &kvm_devices_head, entries) { if (section->mr == kd->mr) { kd->kda.addr = section->offset_within_address_space; } } } static void kvm_arm_devlistener_del(MemoryListener *listener, MemoryRegionSection *section) { KVMDevice *kd; QSLIST_FOREACH(kd, &kvm_devices_head, entries) { if (section->mr == kd->mr) { kd->kda.addr = -1; } } } static MemoryListener devlistener = { .name = "kvm-arm", .region_add = kvm_arm_devlistener_add, .region_del = kvm_arm_devlistener_del, .priority = MEMORY_LISTENER_PRIORITY_MIN, }; static void kvm_arm_set_device_addr(KVMDevice *kd) { struct kvm_device_attr *attr = &kd->kdattr; int ret; /* If the device control API is available and we have a device fd on the * KVMDevice struct, let's use the newer API */ if (kd->dev_fd >= 0) { uint64_t addr = kd->kda.addr; addr |= kd->kda_addr_ormask; attr->addr = (uintptr_t)&addr; ret = kvm_device_ioctl(kd->dev_fd, KVM_SET_DEVICE_ATTR, attr); } else { ret = kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR, &kd->kda); } if (ret < 0) { fprintf(stderr, "Failed to set device address: %s\n", strerror(-ret)); abort(); } } static void kvm_arm_machine_init_done(Notifier *notifier, void *data) { KVMDevice *kd, *tkd; QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) { if (kd->kda.addr != -1) { kvm_arm_set_device_addr(kd); } memory_region_unref(kd->mr); QSLIST_REMOVE_HEAD(&kvm_devices_head, entries); g_free(kd); } memory_listener_unregister(&devlistener); } static Notifier notify = { .notify = kvm_arm_machine_init_done, }; void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group, uint64_t attr, int dev_fd, uint64_t addr_ormask) { KVMDevice *kd; if (!kvm_irqchip_in_kernel()) { return; } if (QSLIST_EMPTY(&kvm_devices_head)) { memory_listener_register(&devlistener, &address_space_memory); qemu_add_machine_init_done_notifier(¬ify); } kd = g_new0(KVMDevice, 1); kd->mr = mr; kd->kda.id = devid; kd->kda.addr = -1; kd->kdattr.flags = 0; kd->kdattr.group = group; kd->kdattr.attr = attr; kd->dev_fd = dev_fd; kd->kda_addr_ormask = addr_ormask; QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries); memory_region_ref(kd->mr); } static int compare_u64(const void *a, const void *b) { if (*(uint64_t *)a > *(uint64_t *)b) { return 1; } if (*(uint64_t *)a < *(uint64_t *)b) { return -1; } return 0; } /* * cpreg_values are sorted in ascending order by KVM register ID * (see kvm_arm_init_cpreg_list). This allows us to cheaply find * the storage for a KVM register by ID with a binary search. */ static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx) { uint64_t *res; res = bsearch(®idx, cpu->cpreg_indexes, cpu->cpreg_array_len, sizeof(uint64_t), compare_u64); assert(res); return &cpu->cpreg_values[res - cpu->cpreg_indexes]; } /* Initialize the ARMCPU cpreg list according to the kernel's * definition of what CPU registers it knows about (and throw away * the previous TCG-created cpreg list). */ int kvm_arm_init_cpreg_list(ARMCPU *cpu) { struct kvm_reg_list rl; struct kvm_reg_list *rlp; int i, ret, arraylen; CPUState *cs = CPU(cpu); rl.n = 0; ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, &rl); if (ret != -E2BIG) { return ret; } rlp = g_malloc(sizeof(struct kvm_reg_list) + rl.n * sizeof(uint64_t)); rlp->n = rl.n; ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, rlp); if (ret) { goto out; } /* Sort the list we get back from the kernel, since cpreg_tuples * must be in strictly ascending order. */ qsort(&rlp->reg, rlp->n, sizeof(rlp->reg[0]), compare_u64); for (i = 0, arraylen = 0; i < rlp->n; i++) { if (!kvm_arm_reg_syncs_via_cpreg_list(rlp->reg[i])) { continue; } switch (rlp->reg[i] & KVM_REG_SIZE_MASK) { case KVM_REG_SIZE_U32: case KVM_REG_SIZE_U64: break; default: fprintf(stderr, "Can't handle size of register in kernel list\n"); ret = -EINVAL; goto out; } arraylen++; } cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen); cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen); cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes, arraylen); cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values, arraylen); cpu->cpreg_array_len = arraylen; cpu->cpreg_vmstate_array_len = arraylen; for (i = 0, arraylen = 0; i < rlp->n; i++) { uint64_t regidx = rlp->reg[i]; if (!kvm_arm_reg_syncs_via_cpreg_list(regidx)) { continue; } cpu->cpreg_indexes[arraylen] = regidx; arraylen++; } assert(cpu->cpreg_array_len == arraylen); if (!write_kvmstate_to_list(cpu)) { /* Shouldn't happen unless kernel is inconsistent about * what registers exist. */ fprintf(stderr, "Initial read of kernel register state failed\n"); ret = -EINVAL; goto out; } out: g_free(rlp); return ret; } /** * kvm_arm_cpreg_level: * @regidx: KVM register index * * Return the level of this coprocessor/system register. Return value is * either KVM_PUT_RUNTIME_STATE, KVM_PUT_RESET_STATE, or KVM_PUT_FULL_STATE. */ static int kvm_arm_cpreg_level(uint64_t regidx) { /* * All system registers are assumed to be level KVM_PUT_RUNTIME_STATE. * If a register should be written less often, you must add it here * with a state of either KVM_PUT_RESET_STATE or KVM_PUT_FULL_STATE. */ switch (regidx) { case KVM_REG_ARM_TIMER_CNT: case KVM_REG_ARM_PTIMER_CNT: return KVM_PUT_FULL_STATE; } return KVM_PUT_RUNTIME_STATE; } bool write_kvmstate_to_list(ARMCPU *cpu) { CPUState *cs = CPU(cpu); int i; bool ok = true; for (i = 0; i < cpu->cpreg_array_len; i++) { uint64_t regidx = cpu->cpreg_indexes[i]; uint32_t v32; int ret; switch (regidx & KVM_REG_SIZE_MASK) { case KVM_REG_SIZE_U32: ret = kvm_get_one_reg(cs, regidx, &v32); if (!ret) { cpu->cpreg_values[i] = v32; } break; case KVM_REG_SIZE_U64: ret = kvm_get_one_reg(cs, regidx, cpu->cpreg_values + i); break; default: g_assert_not_reached(); } if (ret) { ok = false; } } return ok; } bool write_list_to_kvmstate(ARMCPU *cpu, int level) { CPUState *cs = CPU(cpu); int i; bool ok = true; for (i = 0; i < cpu->cpreg_array_len; i++) { uint64_t regidx = cpu->cpreg_indexes[i]; uint32_t v32; int ret; if (kvm_arm_cpreg_level(regidx) > level) { continue; } switch (regidx & KVM_REG_SIZE_MASK) { case KVM_REG_SIZE_U32: v32 = cpu->cpreg_values[i]; ret = kvm_set_one_reg(cs, regidx, &v32); break; case KVM_REG_SIZE_U64: ret = kvm_set_one_reg(cs, regidx, cpu->cpreg_values + i); break; default: g_assert_not_reached(); } if (ret) { /* We might fail for "unknown register" and also for * "you tried to set a register which is constant with * a different value from what it actually contains". */ ok = false; } } return ok; } void kvm_arm_cpu_pre_save(ARMCPU *cpu) { /* KVM virtual time adjustment */ if (cpu->kvm_vtime_dirty) { *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT) = cpu->kvm_vtime; } } void kvm_arm_cpu_post_load(ARMCPU *cpu) { /* KVM virtual time adjustment */ if (cpu->kvm_adjvtime) { cpu->kvm_vtime = *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT); cpu->kvm_vtime_dirty = true; } } void kvm_arm_reset_vcpu(ARMCPU *cpu) { int ret; /* Re-init VCPU so that all registers are set to * their respective reset values. */ ret = kvm_arm_vcpu_init(CPU(cpu)); if (ret < 0) { fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret)); abort(); } if (!write_kvmstate_to_list(cpu)) { fprintf(stderr, "write_kvmstate_to_list failed\n"); abort(); } /* * Sync the reset values also into the CPUState. This is necessary * because the next thing we do will be a kvm_arch_put_registers() * which will update the list values from the CPUState before copying * the list values back to KVM. It's OK to ignore failure returns here * for the same reason we do so in kvm_arch_get_registers(). */ write_list_to_cpustate(cpu); } /* * Update KVM's MP_STATE based on what QEMU thinks it is */ int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu) { if (cap_has_mp_state) { struct kvm_mp_state mp_state = { .mp_state = (cpu->power_state == PSCI_OFF) ? KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE }; int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state); if (ret) { fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n", __func__, ret, strerror(-ret)); return -1; } } return 0; } /* * Sync the KVM MP_STATE into QEMU */ int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu) { if (cap_has_mp_state) { struct kvm_mp_state mp_state; int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state); if (ret) { fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n", __func__, ret, strerror(-ret)); abort(); } cpu->power_state = (mp_state.mp_state == KVM_MP_STATE_STOPPED) ? PSCI_OFF : PSCI_ON; } return 0; } /** * kvm_arm_get_virtual_time: * @cs: CPUState * * Gets the VCPU's virtual counter and stores it in the KVM CPU state. */ static void kvm_arm_get_virtual_time(CPUState *cs) { ARMCPU *cpu = ARM_CPU(cs); int ret; if (cpu->kvm_vtime_dirty) { return; } ret = kvm_get_one_reg(cs, KVM_REG_ARM_TIMER_CNT, &cpu->kvm_vtime); if (ret) { error_report("Failed to get KVM_REG_ARM_TIMER_CNT"); abort(); } cpu->kvm_vtime_dirty = true; } /** * kvm_arm_put_virtual_time: * @cs: CPUState * * Sets the VCPU's virtual counter to the value stored in the KVM CPU state. */ static void kvm_arm_put_virtual_time(CPUState *cs) { ARMCPU *cpu = ARM_CPU(cs); int ret; if (!cpu->kvm_vtime_dirty) { return; } ret = kvm_set_one_reg(cs, KVM_REG_ARM_TIMER_CNT, &cpu->kvm_vtime); if (ret) { error_report("Failed to set KVM_REG_ARM_TIMER_CNT"); abort(); } cpu->kvm_vtime_dirty = false; } int kvm_put_vcpu_events(ARMCPU *cpu) { CPUARMState *env = &cpu->env; struct kvm_vcpu_events events; int ret; if (!kvm_has_vcpu_events()) { return 0; } memset(&events, 0, sizeof(events)); events.exception.serror_pending = env->serror.pending; /* Inject SError to guest with specified syndrome if host kernel * supports it, otherwise inject SError without syndrome. */ if (cap_has_inject_serror_esr) { events.exception.serror_has_esr = env->serror.has_esr; events.exception.serror_esr = env->serror.esr; } ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events); if (ret) { error_report("failed to put vcpu events"); } return ret; } int kvm_get_vcpu_events(ARMCPU *cpu) { CPUARMState *env = &cpu->env; struct kvm_vcpu_events events; int ret; if (!kvm_has_vcpu_events()) { return 0; } memset(&events, 0, sizeof(events)); ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events); if (ret) { error_report("failed to get vcpu events"); return ret; } env->serror.pending = events.exception.serror_pending; env->serror.has_esr = events.exception.serror_has_esr; env->serror.esr = events.exception.serror_esr; return 0; } #define ARM64_REG_ESR_EL1 ARM64_SYS_REG(3, 0, 5, 2, 0) #define ARM64_REG_TCR_EL1 ARM64_SYS_REG(3, 0, 2, 0, 2) /* * ESR_EL1 * ISS encoding * AARCH64: DFSC, bits [5:0] * AARCH32: * TTBCR.EAE == 0 * FS[4] - DFSR[10] * FS[3:0] - DFSR[3:0] * TTBCR.EAE == 1 * FS, bits [5:0] */ #define ESR_DFSC(aarch64, lpae, v) \ ((aarch64 || (lpae)) ? ((v) & 0x3F) \ : (((v) >> 6) | ((v) & 0x1F))) #define ESR_DFSC_EXTABT(aarch64, lpae) \ ((aarch64) ? 0x10 : (lpae) ? 0x10 : 0x8) /** * kvm_arm_verify_ext_dabt_pending: * @cs: CPUState * * Verify the fault status code wrt the Ext DABT injection * * Returns: true if the fault status code is as expected, false otherwise */ static bool kvm_arm_verify_ext_dabt_pending(CPUState *cs) { uint64_t dfsr_val; if (!kvm_get_one_reg(cs, ARM64_REG_ESR_EL1, &dfsr_val)) { ARMCPU *cpu = ARM_CPU(cs); CPUARMState *env = &cpu->env; int aarch64_mode = arm_feature(env, ARM_FEATURE_AARCH64); int lpae = 0; if (!aarch64_mode) { uint64_t ttbcr; if (!kvm_get_one_reg(cs, ARM64_REG_TCR_EL1, &ttbcr)) { lpae = arm_feature(env, ARM_FEATURE_LPAE) && (ttbcr & TTBCR_EAE); } } /* * The verification here is based on the DFSC bits * of the ESR_EL1 reg only */ return (ESR_DFSC(aarch64_mode, lpae, dfsr_val) == ESR_DFSC_EXTABT(aarch64_mode, lpae)); } return false; } void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run) { ARMCPU *cpu = ARM_CPU(cs); CPUARMState *env = &cpu->env; if (unlikely(env->ext_dabt_raised)) { /* * Verifying that the ext DABT has been properly injected, * otherwise risking indefinitely re-running the faulting instruction * Covering a very narrow case for kernels 5.5..5.5.4 * when injected abort was misconfigured to be * an IMPLEMENTATION DEFINED exception (for 32-bit EL1) */ if (!arm_feature(env, ARM_FEATURE_AARCH64) && unlikely(!kvm_arm_verify_ext_dabt_pending(cs))) { error_report("Data abort exception with no valid ISS generated by " "guest memory access. KVM unable to emulate faulting " "instruction. Failed to inject an external data abort " "into the guest."); abort(); } /* Clear the status */ env->ext_dabt_raised = 0; } } MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run) { ARMCPU *cpu; uint32_t switched_level; if (kvm_irqchip_in_kernel()) { /* * We only need to sync timer states with user-space interrupt * controllers, so return early and save cycles if we don't. */ return MEMTXATTRS_UNSPECIFIED; } cpu = ARM_CPU(cs); /* Synchronize our shadowed in-kernel device irq lines with the kvm ones */ if (run->s.regs.device_irq_level != cpu->device_irq_level) { switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level; qemu_mutex_lock_iothread(); if (switched_level & KVM_ARM_DEV_EL1_VTIMER) { qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT], !!(run->s.regs.device_irq_level & KVM_ARM_DEV_EL1_VTIMER)); switched_level &= ~KVM_ARM_DEV_EL1_VTIMER; } if (switched_level & KVM_ARM_DEV_EL1_PTIMER) { qemu_set_irq(cpu->gt_timer_outputs[GTIMER_PHYS], !!(run->s.regs.device_irq_level & KVM_ARM_DEV_EL1_PTIMER)); switched_level &= ~KVM_ARM_DEV_EL1_PTIMER; } if (switched_level & KVM_ARM_DEV_PMU) { qemu_set_irq(cpu->pmu_interrupt, !!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU)); switched_level &= ~KVM_ARM_DEV_PMU; } if (switched_level) { qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n", __func__, switched_level); } /* We also mark unknown levels as processed to not waste cycles */ cpu->device_irq_level = run->s.regs.device_irq_level; qemu_mutex_unlock_iothread(); } return MEMTXATTRS_UNSPECIFIED; } void kvm_arm_vm_state_change(void *opaque, bool running, RunState state) { CPUState *cs = opaque; ARMCPU *cpu = ARM_CPU(cs); if (running) { if (cpu->kvm_adjvtime) { kvm_arm_put_virtual_time(cs); } } else { if (cpu->kvm_adjvtime) { kvm_arm_get_virtual_time(cs); } } } /** * kvm_arm_handle_dabt_nisv: * @cs: CPUState * @esr_iss: ISS encoding (limited) for the exception from Data Abort * ISV bit set to '0b0' -> no valid instruction syndrome * @fault_ipa: faulting address for the synchronous data abort * * Returns: 0 if the exception has been handled, < 0 otherwise */ static int kvm_arm_handle_dabt_nisv(CPUState *cs, uint64_t esr_iss, uint64_t fault_ipa) { ARMCPU *cpu = ARM_CPU(cs); CPUARMState *env = &cpu->env; /* * Request KVM to inject the external data abort into the guest */ if (cap_has_inject_ext_dabt) { struct kvm_vcpu_events events = { }; /* * The external data abort event will be handled immediately by KVM * using the address fault that triggered the exit on given VCPU. * Requesting injection of the external data abort does not rely * on any other VCPU state. Therefore, in this particular case, the VCPU * synchronization can be exceptionally skipped. */ events.exception.ext_dabt_pending = 1; /* KVM_CAP_ARM_INJECT_EXT_DABT implies KVM_CAP_VCPU_EVENTS */ if (!kvm_vcpu_ioctl(cs, KVM_SET_VCPU_EVENTS, &events)) { env->ext_dabt_raised = 1; return 0; } } else { error_report("Data abort exception triggered by guest memory access " "at physical address: 0x" TARGET_FMT_lx, (target_ulong)fault_ipa); error_printf("KVM unable to emulate faulting instruction.\n"); } return -1; } /** * kvm_arm_handle_debug: * @cs: CPUState * @debug_exit: debug part of the KVM exit structure * * Returns: TRUE if the debug exception was handled. * * See v8 ARM ARM D7.2.27 ESR_ELx, Exception Syndrome Register * * To minimise translating between kernel and user-space the kernel * ABI just provides user-space with the full exception syndrome * register value to be decoded in QEMU. */ static bool kvm_arm_handle_debug(CPUState *cs, struct kvm_debug_exit_arch *debug_exit) { int hsr_ec = syn_get_ec(debug_exit->hsr); ARMCPU *cpu = ARM_CPU(cs); CPUARMState *env = &cpu->env; /* Ensure PC is synchronised */ kvm_cpu_synchronize_state(cs); switch (hsr_ec) { case EC_SOFTWARESTEP: if (cs->singlestep_enabled) { return true; } else { /* * The kernel should have suppressed the guest's ability to * single step at this point so something has gone wrong. */ error_report("%s: guest single-step while debugging unsupported" " (%"PRIx64", %"PRIx32")", __func__, env->pc, debug_exit->hsr); return false; } break; case EC_AA64_BKPT: if (kvm_find_sw_breakpoint(cs, env->pc)) { return true; } break; case EC_BREAKPOINT: if (find_hw_breakpoint(cs, env->pc)) { return true; } break; case EC_WATCHPOINT: { CPUWatchpoint *wp = find_hw_watchpoint(cs, debug_exit->far); if (wp) { cs->watchpoint_hit = wp; return true; } break; } default: error_report("%s: unhandled debug exit (%"PRIx32", %"PRIx64")", __func__, debug_exit->hsr, env->pc); } /* If we are not handling the debug exception it must belong to * the guest. Let's re-use the existing TCG interrupt code to set * everything up properly. */ cs->exception_index = EXCP_BKPT; env->exception.syndrome = debug_exit->hsr; env->exception.vaddress = debug_exit->far; env->exception.target_el = 1; qemu_mutex_lock_iothread(); arm_cpu_do_interrupt(cs); qemu_mutex_unlock_iothread(); return false; } int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) { int ret = 0; switch (run->exit_reason) { case KVM_EXIT_DEBUG: if (kvm_arm_handle_debug(cs, &run->debug.arch)) { ret = EXCP_DEBUG; } /* otherwise return to guest */ break; case KVM_EXIT_ARM_NISV: /* External DABT with no valid iss to decode */ ret = kvm_arm_handle_dabt_nisv(cs, run->arm_nisv.esr_iss, run->arm_nisv.fault_ipa); break; default: qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n", __func__, run->exit_reason); break; } return ret; } bool kvm_arch_stop_on_emulation_error(CPUState *cs) { return true; } int kvm_arch_process_async_events(CPUState *cs) { return 0; } /** * kvm_arm_hw_debug_active: * @cs: CPU State * * Return: TRUE if any hardware breakpoints in use. */ static bool kvm_arm_hw_debug_active(CPUState *cs) { return ((cur_hw_wps > 0) || (cur_hw_bps > 0)); } /** * kvm_arm_copy_hw_debug_data: * @ptr: kvm_guest_debug_arch structure * * Copy the architecture specific debug registers into the * kvm_guest_debug ioctl structure. */ static void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr) { int i; memset(ptr, 0, sizeof(struct kvm_guest_debug_arch)); for (i = 0; i < max_hw_wps; i++) { HWWatchpoint *wp = get_hw_wp(i); ptr->dbg_wcr[i] = wp->wcr; ptr->dbg_wvr[i] = wp->wvr; } for (i = 0; i < max_hw_bps; i++) { HWBreakpoint *bp = get_hw_bp(i); ptr->dbg_bcr[i] = bp->bcr; ptr->dbg_bvr[i] = bp->bvr; } } void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg) { if (kvm_sw_breakpoints_active(cs)) { dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP; } if (kvm_arm_hw_debug_active(cs)) { dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW; kvm_arm_copy_hw_debug_data(&dbg->arch); } } void kvm_arch_init_irq_routing(KVMState *s) { } int kvm_arch_irqchip_create(KVMState *s) { if (kvm_kernel_irqchip_split()) { error_report("-machine kernel_irqchip=split is not supported on ARM."); exit(1); } /* If we can create the VGIC using the newer device control API, we * let the device do this when it initializes itself, otherwise we * fall back to the old API */ return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL); } int kvm_arm_vgic_probe(void) { int val = 0; if (kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V3, true) == 0) { val |= KVM_ARM_VGIC_V3; } if (kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V2, true) == 0) { val |= KVM_ARM_VGIC_V2; } return val; } int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level) { int kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) | irq; int cpu_idx1 = cpu % 256; int cpu_idx2 = cpu / 256; kvm_irq |= (cpu_idx1 << KVM_ARM_IRQ_VCPU_SHIFT) | (cpu_idx2 << KVM_ARM_IRQ_VCPU2_SHIFT); return kvm_set_irq(kvm_state, kvm_irq, !!level); } int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route, uint64_t address, uint32_t data, PCIDevice *dev) { AddressSpace *as = pci_device_iommu_address_space(dev); hwaddr xlat, len, doorbell_gpa; MemoryRegionSection mrs; MemoryRegion *mr; if (as == &address_space_memory) { return 0; } /* MSI doorbell address is translated by an IOMMU */ RCU_READ_LOCK_GUARD(); mr = address_space_translate(as, address, &xlat, &len, true, MEMTXATTRS_UNSPECIFIED); if (!mr) { return 1; } mrs = memory_region_find(mr, xlat, 1); if (!mrs.mr) { return 1; } doorbell_gpa = mrs.offset_within_address_space; memory_region_unref(mrs.mr); route->u.msi.address_lo = doorbell_gpa; route->u.msi.address_hi = doorbell_gpa >> 32; trace_kvm_arm_fixup_msi_route(address, doorbell_gpa); return 0; } int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route, int vector, PCIDevice *dev) { return 0; } int kvm_arch_release_virq_post(int virq) { return 0; } int kvm_arch_msi_data_to_gsi(uint32_t data) { return (data - 32) & 0xffff; } bool kvm_arch_cpu_check_are_resettable(void) { return true; } static void kvm_arch_get_eager_split_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { KVMState *s = KVM_STATE(obj); uint64_t value = s->kvm_eager_split_size; visit_type_size(v, name, &value, errp); } static void kvm_arch_set_eager_split_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { KVMState *s = KVM_STATE(obj); uint64_t value; if (s->fd != -1) { error_setg(errp, "Unable to set early-split-size after KVM has been initialized"); return; } if (!visit_type_size(v, name, &value, errp)) { return; } if (value && !is_power_of_2(value)) { error_setg(errp, "early-split-size must be a power of two"); return; } s->kvm_eager_split_size = value; } void kvm_arch_accel_class_init(ObjectClass *oc) { object_class_property_add(oc, "eager-split-size", "size", kvm_arch_get_eager_split_size, kvm_arch_set_eager_split_size, NULL, NULL); object_class_property_set_description(oc, "eager-split-size", "Eager Page Split chunk size for hugepages. (default: 0, disabled)"); }