Re: [PATCH 8/8] KVM: x86: SVM: remove vgif_enabled()

[Sean Christopherson <seanjc@google.com>]

On Tue, Mar 22, 2022, Maxim Levitsky wrote:
> KVM always uses vgif when allowed, thus there is
> no need to query current vmcb for it

It'd be helpful to explicitly call out that KVM always takes V_GIF_ENABLE_MASK
from vmcs01, otherwise this looks like it does unintentend things when KVM is
runing vmcb02.

> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> ---
>  arch/x86/kvm/svm/svm.c | 12 ++++++------
>  arch/x86/kvm/svm/svm.h | 12 ++++--------
>  2 files changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index acf04cf4ed2a..70fc5897f5f2 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -172,7 +172,7 @@ static int vls = true;
>  module_param(vls, int, 0444);
>  
>  /* enable/disable Virtual GIF */
> -static int vgif = true;
> +int vgif = true;
>  module_param(vgif, int, 0444);

...

> @@ -453,14 +454,9 @@ static inline bool svm_is_intercept(struct vcpu_svm *svm, int bit)
>  	return vmcb_is_intercept(&svm->vmcb->control, bit);
>  }
>  
> -static inline bool vgif_enabled(struct vcpu_svm *svm)
> -{
> -	return !!(svm->vmcb->control.int_ctl & V_GIF_ENABLE_MASK);