[v2] SVM: vNMI (with my fixes)

[PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit

Posted by Maxim Levitsky 2 years, 9 months ago

The CPU doesn't change TLB_CTL value as stated in the PRM (15.16.2):

  "The VMRUN instruction reads, but does not change, the
  value of the TLB_CONTROL field"

Therefore the KVM shouldn't do that either.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 arch/x86/kvm/svm/nested.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index bc9cd7086fa972..37af0338da7c32 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1010,7 +1010,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
 		vmcb12->control.next_rip  = vmcb02->control.next_rip;
 
 	vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
-	vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
 	vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
 	vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
 
-- 
2.26.3

Re: [PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit

Posted by Santosh Shukla 2 years, 9 months ago

Hi Maxim,

On 11/30/2022 1:07 AM, Maxim Levitsky wrote:
> The CPU doesn't change TLB_CTL value as stated in the PRM (15.16.2):
> 
nits:
s / PRM (15.16.2) / APM (15.16.1 - TLB Flush)

>   "The VMRUN instruction reads, but does not change, the
>   value of the TLB_CONTROL field"
> 
> Therefore the KVM shouldn't do that either.
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> ---
>  arch/x86/kvm/svm/nested.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index bc9cd7086fa972..37af0338da7c32 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -1010,7 +1010,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
>  		vmcb12->control.next_rip  = vmcb02->control.next_rip;
>  
>  	vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
> -	vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
>  	vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
>  	vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
>

Re: [PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit

Posted by Maxim Levitsky 2 years, 9 months ago

On Mon, 2022-12-05 at 19:35 +0530, Santosh Shukla wrote:
> Hi Maxim,
> 
> On 11/30/2022 1:07 AM, Maxim Levitsky wrote:
> > The CPU doesn't change TLB_CTL value as stated in the PRM (15.16.2):
> > 
> nits:
> s / PRM (15.16.2) / APM (15.16.1 - TLB Flush)

True for both changes, thanks!

Best regards,
	Maxim Levitsky

> 
> >   "The VMRUN instruction reads, but does not change, the
> >   value of the TLB_CONTROL field"
> > 
> > Therefore the KVM shouldn't do that either.
> > 
> > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> > ---
> >  arch/x86/kvm/svm/nested.c | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> > index bc9cd7086fa972..37af0338da7c32 100644
> > --- a/arch/x86/kvm/svm/nested.c
> > +++ b/arch/x86/kvm/svm/nested.c
> > @@ -1010,7 +1010,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
> >  		vmcb12->control.next_rip  = vmcb02->control.next_rip;
> >  
> >  	vmcb12->control.int_ctl           = svm->nested.ctl.int_ctl;
> > -	vmcb12->control.tlb_ctl           = svm->nested.ctl.tlb_ctl;
> >  	vmcb12->control.event_inj         = svm->nested.ctl.event_inj;
> >  	vmcb12->control.event_inj_err     = svm->nested.ctl.event_inj_err;
> >