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KVM: nVMX: include shadow vmcs12 in nested state

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The shadow vmcs12 cannot be flushed on KVM_GET_NESTED_STATE,
because at that point guest memory is assumed by userspace to
be immutable.  Capture the cache in vmx_get_nested_state, adding
another page at the end if there is an active shadow vmcs12.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-07-18 19:45:51 +02:00
parent 61ada7488f
commit fa58a9fa74
1 changed files with 30 additions and 1 deletions
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31
arch/x86/kvm/vmx.c
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@ -13191,9 +13191,15 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
kvm_state.vmx.vmxon_pa = vmx->nested.vmxon_ptr;
kvm_state.vmx.vmcs_pa = vmx->nested.current_vmptr;
if (vmx->nested.current_vmptr != -1ull)
if (vmx->nested.current_vmptr != -1ull) {
kvm_state.size += VMCS12_SIZE;
if (is_guest_mode(vcpu) &&
nested_cpu_has_shadow_vmcs(vmcs12) &&
vmcs12->vmcs_link_pointer != -1ull)
kvm_state.size += VMCS12_SIZE;
}
if (vmx->nested.smm.vmxon)
kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON;
@ -13232,6 +13238,13 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
if (copy_to_user(user_kvm_nested_state->data, vmcs12, sizeof(*vmcs12)))
return -EFAULT;
if (nested_cpu_has_shadow_vmcs(vmcs12) &&
vmcs12->vmcs_link_pointer != -1ull) {
if (copy_to_user(user_kvm_nested_state->data + VMCS12_SIZE,
get_shadow_vmcs12(vcpu), sizeof(*vmcs12)))
return -EFAULT;
}
out:
return kvm_state.size;
}
@ -13316,6 +13329,22 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
vmx->nested.nested_run_pending =
!!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
if (nested_cpu_has_shadow_vmcs(vmcs12) &&
vmcs12->vmcs_link_pointer != -1ull) {
struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12))
return -EINVAL;
if (copy_from_user(shadow_vmcs12,
user_kvm_nested_state->data + VMCS12_SIZE,
sizeof(*vmcs12)))
return -EFAULT;
if (shadow_vmcs12->hdr.revision_id != VMCS12_REVISION ||
!shadow_vmcs12->hdr.shadow_vmcs)
return -EINVAL;
}
if (check_vmentry_prereqs(vcpu, vmcs12) ||
check_vmentry_postreqs(vcpu, vmcs12, &exit_qual))
return -EINVAL;