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SubjectRe: [PATCH v2] kvm: nVMX: Set nested_run_pending in vmx_set_nested_state after checks complete
On Wed, May 08, 2019 at 02:16:39PM +0200, Paolo Bonzini wrote:
> From: Aaron Lewis <aaronlewis@google.com>

If this is actually attributed to Aaron it needs his SOB.

> nested_run_pending=1 implies we have successfully entered guest mode.
> Move setting from external state in vmx_set_nested_state() until after
> all other checks are complete.

It'd be helpful to at least mention the flag is consumed by
nested_vmx_enter_non_root_mode().

> Based on a patch by Aaron Lewis.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---

For the code itself:

Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>

> arch/x86/kvm/vmx/nested.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index cec77f30f61c..e58caff92694 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -5420,9 +5420,6 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
> if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
> return 0;
>
> - 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);
> @@ -5446,9 +5443,14 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
> return -EINVAL;
>
> vmx->nested.dirty_vmcs12 = true;
> + vmx->nested.nested_run_pending =
> + !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
> +
> ret = nested_vmx_enter_non_root_mode(vcpu, false);
> - if (ret)
> + if (ret) {
> + vmx->nested.nested_run_pending = 0;
> return -EINVAL;
> + }
>
> return 0;
> }
> --
> 1.8.3.1
>

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