diff options
Diffstat (limited to 'target/i386/kvm/kvm.c')
| -rw-r--r-- | target/i386/kvm/kvm.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index f2a96492ce..bed6c00f2c 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -15,6 +15,7 @@ #include "qemu/osdep.h" #include "qapi/qapi-events-run-state.h" #include "qapi/error.h" +#include "qapi/visitor.h" #include <sys/ioctl.h> #include <sys/utsname.h> #include <sys/syscall.h> @@ -132,6 +133,7 @@ static int has_xcrs; static int has_pit_state2; static int has_sregs2; static int has_exception_payload; +static int has_triple_fault_event; static bool has_msr_mcg_ext_ctl; @@ -139,6 +141,8 @@ static struct kvm_cpuid2 *cpuid_cache; static struct kvm_cpuid2 *hv_cpuid_cache; static struct kvm_msr_list *kvm_feature_msrs; +static KVMMSRHandlers msr_handlers[KVM_MSR_FILTER_MAX_RANGES]; + #define BUS_LOCK_SLICE_TIME 1000000000ULL /* ns */ static RateLimit bus_lock_ratelimit_ctrl; static int kvm_get_one_msr(X86CPU *cpu, int index, uint64_t *value); @@ -2397,6 +2401,17 @@ static int kvm_get_supported_msrs(KVMState *s) return ret; } +static bool kvm_rdmsr_core_thread_count(X86CPU *cpu, uint32_t msr, + uint64_t *val) +{ + CPUState *cs = CPU(cpu); + + *val = cs->nr_threads * cs->nr_cores; /* thread count, bits 15..0 */ + *val |= ((uint32_t)cs->nr_cores << 16); /* core count, bits 31..16 */ + + return true; +} + static Notifier smram_machine_done; static KVMMemoryListener smram_listener; static AddressSpace smram_address_space; @@ -2479,6 +2494,16 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } } + has_triple_fault_event = kvm_check_extension(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT); + if (has_triple_fault_event) { + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 0, true); + if (ret < 0) { + error_report("kvm: Failed to enable triple fault event cap: %s", + strerror(-ret)); + return ret; + } + } + ret = kvm_get_supported_msrs(s); if (ret < 0) { return ret; @@ -2584,6 +2609,40 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } } + if (s->notify_vmexit != NOTIFY_VMEXIT_OPTION_DISABLE && + kvm_check_extension(s, KVM_CAP_X86_NOTIFY_VMEXIT)) { + uint64_t notify_window_flags = + ((uint64_t)s->notify_window << 32) | + KVM_X86_NOTIFY_VMEXIT_ENABLED | + KVM_X86_NOTIFY_VMEXIT_USER; + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_NOTIFY_VMEXIT, 0, + notify_window_flags); + if (ret < 0) { + error_report("kvm: Failed to enable notify vmexit cap: %s", + strerror(-ret)); + return ret; + } + } + if (kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { + bool r; + + ret = kvm_vm_enable_cap(s, KVM_CAP_X86_USER_SPACE_MSR, 0, + KVM_MSR_EXIT_REASON_FILTER); + if (ret) { + error_report("Could not enable user space MSRs: %s", + strerror(-ret)); + exit(1); + } + + r = kvm_filter_msr(s, MSR_CORE_THREAD_COUNT, + kvm_rdmsr_core_thread_count, NULL); + if (!r) { + error_report("Could not install MSR_CORE_THREAD_COUNT handler: %s", + strerror(-ret)); + exit(1); + } + } + return 0; } @@ -4295,6 +4354,11 @@ static int kvm_put_vcpu_events(X86CPU *cpu, int level) } } + if (has_triple_fault_event) { + events.flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT; + events.triple_fault.pending = env->triple_fault_pending; + } + return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events); } @@ -4364,6 +4428,10 @@ static int kvm_get_vcpu_events(X86CPU *cpu) } } + if (events.flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT) { + env->triple_fault_pending = events.triple_fault.pending; + } + env->sipi_vector = events.sipi_vector; return 0; @@ -5073,6 +5141,108 @@ void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg) } } +static bool kvm_install_msr_filters(KVMState *s) +{ + uint64_t zero = 0; + struct kvm_msr_filter filter = { + .flags = KVM_MSR_FILTER_DEFAULT_ALLOW, + }; + int r, i, j = 0; + + for (i = 0; i < KVM_MSR_FILTER_MAX_RANGES; i++) { + KVMMSRHandlers *handler = &msr_handlers[i]; + if (handler->msr) { + struct kvm_msr_filter_range *range = &filter.ranges[j++]; + + *range = (struct kvm_msr_filter_range) { + .flags = 0, + .nmsrs = 1, + .base = handler->msr, + .bitmap = (__u8 *)&zero, + }; + + if (handler->rdmsr) { + range->flags |= KVM_MSR_FILTER_READ; + } + + if (handler->wrmsr) { + range->flags |= KVM_MSR_FILTER_WRITE; + } + } + } + + r = kvm_vm_ioctl(s, KVM_X86_SET_MSR_FILTER, &filter); + if (r) { + return false; + } + + return true; +} + +bool kvm_filter_msr(KVMState *s, uint32_t msr, QEMURDMSRHandler *rdmsr, + QEMUWRMSRHandler *wrmsr) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(msr_handlers); i++) { + if (!msr_handlers[i].msr) { + msr_handlers[i] = (KVMMSRHandlers) { + .msr = msr, + .rdmsr = rdmsr, + .wrmsr = wrmsr, + }; + + if (!kvm_install_msr_filters(s)) { + msr_handlers[i] = (KVMMSRHandlers) { }; + return false; + } + + return true; + } + } + + return false; +} + +static int kvm_handle_rdmsr(X86CPU *cpu, struct kvm_run *run) +{ + int i; + bool r; + + for (i = 0; i < ARRAY_SIZE(msr_handlers); i++) { + KVMMSRHandlers *handler = &msr_handlers[i]; + if (run->msr.index == handler->msr) { + if (handler->rdmsr) { + r = handler->rdmsr(cpu, handler->msr, + (uint64_t *)&run->msr.data); + run->msr.error = r ? 0 : 1; + return 0; + } + } + } + + assert(false); +} + +static int kvm_handle_wrmsr(X86CPU *cpu, struct kvm_run *run) +{ + int i; + bool r; + + for (i = 0; i < ARRAY_SIZE(msr_handlers); i++) { + KVMMSRHandlers *handler = &msr_handlers[i]; + if (run->msr.index == handler->msr) { + if (handler->wrmsr) { + r = handler->wrmsr(cpu, handler->msr, run->msr.data); + run->msr.error = r ? 0 : 1; + return 0; + } + } + } + + assert(false); +} + static bool has_sgx_provisioning; static bool __kvm_enable_sgx_provisioning(KVMState *s) @@ -5117,6 +5287,9 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) X86CPU *cpu = X86_CPU(cs); uint64_t code; int ret; + bool ctx_invalid; + char str[256]; + KVMState *state; switch (run->exit_reason) { case KVM_EXIT_HLT: @@ -5172,6 +5345,31 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) /* already handled in kvm_arch_post_run */ ret = 0; break; + case KVM_EXIT_NOTIFY: + ctx_invalid = !!(run->notify.flags & KVM_NOTIFY_CONTEXT_INVALID); + state = KVM_STATE(current_accel()); + sprintf(str, "Encounter a notify exit with %svalid context in" + " guest. There can be possible misbehaves in guest." + " Please have a look.", ctx_invalid ? "in" : ""); + if (ctx_invalid || + state->notify_vmexit == NOTIFY_VMEXIT_OPTION_INTERNAL_ERROR) { + warn_report("KVM internal error: %s", str); + ret = -1; + } else { + warn_report_once("KVM: %s", str); + ret = 0; + } + break; + case KVM_EXIT_X86_RDMSR: + /* We only enable MSR filtering, any other exit is bogus */ + assert(run->msr.reason == KVM_MSR_EXIT_REASON_FILTER); + ret = kvm_handle_rdmsr(cpu, run); + break; + case KVM_EXIT_X86_WRMSR: + /* We only enable MSR filtering, any other exit is bogus */ + assert(run->msr.reason == KVM_MSR_EXIT_REASON_FILTER); + ret = kvm_handle_wrmsr(cpu, run); + break; default: fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason); ret = -1; @@ -5448,3 +5646,71 @@ void kvm_request_xsave_components(X86CPU *cpu, uint64_t mask) mask &= ~BIT_ULL(bit); } } + +static int kvm_arch_get_notify_vmexit(Object *obj, Error **errp) +{ + KVMState *s = KVM_STATE(obj); + return s->notify_vmexit; +} + +static void kvm_arch_set_notify_vmexit(Object *obj, int value, Error **errp) +{ + KVMState *s = KVM_STATE(obj); + + if (s->fd != -1) { + error_setg(errp, "Cannot set properties after the accelerator has been initialized"); + return; + } + + s->notify_vmexit = value; +} + +static void kvm_arch_get_notify_window(Object *obj, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + KVMState *s = KVM_STATE(obj); + uint32_t value = s->notify_window; + + visit_type_uint32(v, name, &value, errp); +} + +static void kvm_arch_set_notify_window(Object *obj, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + KVMState *s = KVM_STATE(obj); + Error *error = NULL; + uint32_t value; + + if (s->fd != -1) { + error_setg(errp, "Cannot set properties after the accelerator has been initialized"); + return; + } + + visit_type_uint32(v, name, &value, &error); + if (error) { + error_propagate(errp, error); + return; + } + + s->notify_window = value; +} + +void kvm_arch_accel_class_init(ObjectClass *oc) +{ + object_class_property_add_enum(oc, "notify-vmexit", "NotifyVMexitOption", + &NotifyVmexitOption_lookup, + kvm_arch_get_notify_vmexit, + kvm_arch_set_notify_vmexit); + object_class_property_set_description(oc, "notify-vmexit", + "Enable notify VM exit"); + + object_class_property_add(oc, "notify-window", "uint32", + kvm_arch_get_notify_window, + kvm_arch_set_notify_window, + NULL, NULL); + object_class_property_set_description(oc, "notify-window", + "Clock cycles without an event window " + "after which a notification VM exit occurs"); +} |