diff options
Diffstat (limited to 'target/i386/machine.c')
| -rw-r--r-- | target/i386/machine.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/target/i386/machine.c b/target/i386/machine.c index a39ce7feea..a6afdf8720 100644 --- a/target/i386/machine.c +++ b/target/i386/machine.c @@ -231,6 +231,15 @@ static int cpu_pre_save(void *opaque) env->segs[R_SS].flags &= ~(env->segs[R_SS].flags & DESC_DPL_MASK); } +#ifdef CONFIG_KVM + /* Verify we have nested virtualization state from kernel if required */ + if (cpu_has_nested_virt(env) && !env->nested_state) { + error_report("Guest enabled nested virtualization but kernel " + "does not support saving of nested state"); + return -EINVAL; + } +#endif + return 0; } @@ -278,6 +287,16 @@ static int cpu_post_load(void *opaque, int version_id) env->hflags &= ~HF_CPL_MASK; env->hflags |= (env->segs[R_SS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK; +#ifdef CONFIG_KVM + if ((env->hflags & HF_GUEST_MASK) && + (!env->nested_state || + !(env->nested_state->flags & KVM_STATE_NESTED_GUEST_MODE))) { + error_report("vCPU set in guest-mode inconsistent with " + "migrated kernel nested state"); + return -EINVAL; + } +#endif + env->fpstt = (env->fpus_vmstate >> 11) & 7; env->fpus = env->fpus_vmstate & ~0x3800; env->fptag_vmstate ^= 0xff; @@ -851,6 +870,182 @@ static const VMStateDescription vmstate_tsc_khz = { } }; +#ifdef CONFIG_KVM + +static bool vmx_vmcs12_needed(void *opaque) +{ + struct kvm_nested_state *nested_state = opaque; + return (nested_state->size > + offsetof(struct kvm_nested_state, data.vmx[0].vmcs12)); +} + +static const VMStateDescription vmstate_vmx_vmcs12 = { + .name = "cpu/kvm_nested_state/vmx/vmcs12", + .version_id = 1, + .minimum_version_id = 1, + .needed = vmx_vmcs12_needed, + .fields = (VMStateField[]) { + VMSTATE_UINT8_ARRAY(data.vmx[0].vmcs12, + struct kvm_nested_state, + KVM_STATE_NESTED_VMX_VMCS_SIZE), + VMSTATE_END_OF_LIST() + } +}; + +static bool vmx_shadow_vmcs12_needed(void *opaque) +{ + struct kvm_nested_state *nested_state = opaque; + return (nested_state->size > + offsetof(struct kvm_nested_state, data.vmx[0].shadow_vmcs12)); +} + +static const VMStateDescription vmstate_vmx_shadow_vmcs12 = { + .name = "cpu/kvm_nested_state/vmx/shadow_vmcs12", + .version_id = 1, + .minimum_version_id = 1, + .needed = vmx_shadow_vmcs12_needed, + .fields = (VMStateField[]) { + VMSTATE_UINT8_ARRAY(data.vmx[0].shadow_vmcs12, + struct kvm_nested_state, + KVM_STATE_NESTED_VMX_VMCS_SIZE), + VMSTATE_END_OF_LIST() + } +}; + +static bool vmx_nested_state_needed(void *opaque) +{ + struct kvm_nested_state *nested_state = opaque; + + return ((nested_state->format == KVM_STATE_NESTED_FORMAT_VMX) && + ((nested_state->hdr.vmx.vmxon_pa != -1ull) || + (nested_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))); +} + +static const VMStateDescription vmstate_vmx_nested_state = { + .name = "cpu/kvm_nested_state/vmx", + .version_id = 1, + .minimum_version_id = 1, + .needed = vmx_nested_state_needed, + .fields = (VMStateField[]) { + VMSTATE_U64(hdr.vmx.vmxon_pa, struct kvm_nested_state), + VMSTATE_U64(hdr.vmx.vmcs12_pa, struct kvm_nested_state), + VMSTATE_U16(hdr.vmx.smm.flags, struct kvm_nested_state), + VMSTATE_END_OF_LIST() + }, + .subsections = (const VMStateDescription*[]) { + &vmstate_vmx_vmcs12, + &vmstate_vmx_shadow_vmcs12, + NULL, + } +}; + +static bool svm_nested_state_needed(void *opaque) +{ + struct kvm_nested_state *nested_state = opaque; + + return (nested_state->format == KVM_STATE_NESTED_FORMAT_SVM); +} + +static const VMStateDescription vmstate_svm_nested_state = { + .name = "cpu/kvm_nested_state/svm", + .version_id = 1, + .minimum_version_id = 1, + .needed = svm_nested_state_needed, + .fields = (VMStateField[]) { + VMSTATE_END_OF_LIST() + } +}; + +static bool nested_state_needed(void *opaque) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + + return (env->nested_state && + (vmx_nested_state_needed(env->nested_state) || + svm_nested_state_needed(env->nested_state))); +} + +static int nested_state_post_load(void *opaque, int version_id) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + struct kvm_nested_state *nested_state = env->nested_state; + int min_nested_state_len = offsetof(struct kvm_nested_state, data); + int max_nested_state_len = kvm_max_nested_state_length(); + + /* + * If our kernel don't support setting nested state + * and we have received nested state from migration stream, + * we need to fail migration + */ + if (max_nested_state_len <= 0) { + error_report("Received nested state when kernel cannot restore it"); + return -EINVAL; + } + + /* + * Verify that the size of received nested_state struct + * at least cover required header and is not larger + * than the max size that our kernel support + */ + if (nested_state->size < min_nested_state_len) { + error_report("Received nested state size less than min: " + "len=%d, min=%d", + nested_state->size, min_nested_state_len); + return -EINVAL; + } + if (nested_state->size > max_nested_state_len) { + error_report("Recieved unsupported nested state size: " + "nested_state->size=%d, max=%d", + nested_state->size, max_nested_state_len); + return -EINVAL; + } + + /* Verify format is valid */ + if ((nested_state->format != KVM_STATE_NESTED_FORMAT_VMX) && + (nested_state->format != KVM_STATE_NESTED_FORMAT_SVM)) { + error_report("Received invalid nested state format: %d", + nested_state->format); + return -EINVAL; + } + + return 0; +} + +static const VMStateDescription vmstate_kvm_nested_state = { + .name = "cpu/kvm_nested_state", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_U16(flags, struct kvm_nested_state), + VMSTATE_U16(format, struct kvm_nested_state), + VMSTATE_U32(size, struct kvm_nested_state), + VMSTATE_END_OF_LIST() + }, + .subsections = (const VMStateDescription*[]) { + &vmstate_vmx_nested_state, + &vmstate_svm_nested_state, + NULL + } +}; + +static const VMStateDescription vmstate_nested_state = { + .name = "cpu/nested_state", + .version_id = 1, + .minimum_version_id = 1, + .needed = nested_state_needed, + .post_load = nested_state_post_load, + .fields = (VMStateField[]) { + VMSTATE_STRUCT_POINTER(env.nested_state, X86CPU, + vmstate_kvm_nested_state, + struct kvm_nested_state), + VMSTATE_END_OF_LIST() + } +}; + +#endif + static bool mcg_ext_ctl_needed(void *opaque) { X86CPU *cpu = opaque; @@ -1113,6 +1308,9 @@ VMStateDescription vmstate_x86_cpu = { #ifndef TARGET_X86_64 &vmstate_efer32, #endif +#ifdef CONFIG_KVM + &vmstate_nested_state, +#endif NULL } }; |