diff mbox series

[v3,3/3] KVM: SVM: Fix disable pause loop exit/pause filtering capability on SVM

Message ID 1596165141-28874-3-git-send-email-wanpengli@tencent.com (mailing list archive)
State New, archived
Headers show
Series [v3,1/3] KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled | expand

Commit Message

Wanpeng Li July 31, 2020, 3:12 a.m. UTC 
From: Wanpeng Li <wanpengli@tencent.com>

'Commit 8566ac8b8e7c ("KVM: SVM: Implement pause loop exit logic in SVM")' 
drops disable pause loop exit/pause filtering capability completely, I 
guess it is a merge fault by Radim since disable vmexits capabilities and 
pause loop exit for SVM patchsets are merged at the same time. This patch 
reintroduces the disable pause loop exit/pause filtering capability support.

Reported-by: Haiwei Li <lihaiwei@tencent.com>
Tested-by: Haiwei Li <lihaiwei@tencent.com>
Fixes: 8566ac8b (KVM: SVM: Implement pause loop exit logic in SVM)
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
v2 -> v3:
 * simplify the condition in init_vmcb() 

 arch/x86/kvm/svm/svm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

Comments

Paolo Bonzini July 31, 2020, 7:21 a.m. UTC | #1 
On 31/07/20 05:12, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@tencent.com>
> 
> 'Commit 8566ac8b8e7c ("KVM: SVM: Implement pause loop exit logic in SVM")' 
> drops disable pause loop exit/pause filtering capability completely, I 
> guess it is a merge fault by Radim since disable vmexits capabilities and 
> pause loop exit for SVM patchsets are merged at the same time. This patch 
> reintroduces the disable pause loop exit/pause filtering capability support.
> 
> Reported-by: Haiwei Li <lihaiwei@tencent.com>
> Tested-by: Haiwei Li <lihaiwei@tencent.com>
> Fixes: 8566ac8b (KVM: SVM: Implement pause loop exit logic in SVM)
> Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
> ---
> v2 -> v3:
>  * simplify the condition in init_vmcb() 
> 
>  arch/x86/kvm/svm/svm.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index c0da4dd..bf77f90 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -1090,7 +1090,7 @@ static void init_vmcb(struct vcpu_svm *svm)
>  	svm->nested.vmcb = 0;
>  	svm->vcpu.arch.hflags = 0;
>  
> -	if (pause_filter_count) {
> +	if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
>  		control->pause_filter_count = pause_filter_count;
>  		if (pause_filter_thresh)
>  			control->pause_filter_thresh = pause_filter_thresh;
> @@ -2693,7 +2693,7 @@ static int pause_interception(struct vcpu_svm *svm)
>  	struct kvm_vcpu *vcpu = &svm->vcpu;
>  	bool in_kernel = (svm_get_cpl(vcpu) == 0);
>  
> -	if (pause_filter_thresh)
> +	if (!kvm_pause_in_guest(vcpu->kvm))
>  		grow_ple_window(vcpu);
>  
>  	kvm_vcpu_on_spin(vcpu, in_kernel);
> @@ -3780,7 +3780,7 @@ static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu)
>  
>  static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
>  {
> -	if (pause_filter_thresh)
> +	if (!kvm_pause_in_guest(vcpu->kvm))
>  		shrink_ple_window(vcpu);
>  }
>  
> @@ -3958,6 +3958,9 @@ static void svm_vm_destroy(struct kvm *kvm)
>  
>  static int svm_vm_init(struct kvm *kvm)
>  {
> +	if (!pause_filter_count || !pause_filter_thresh)
> +		kvm->arch.pause_in_guest = true;
> +
>  	if (avic) {
>  		int ret = avic_vm_init(kvm);
>  		if (ret)
> 

Queued all three, thanks.  Please do send a testcase for patch 1
however, I only queued it in order to have it in 5.8.

Paolo
Wanpeng Li July 31, 2020, 9:44 a.m. UTC | #2 
On Fri, 31 Jul 2020 at 15:21, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 31/07/20 05:12, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@tencent.com>
> >
> > 'Commit 8566ac8b8e7c ("KVM: SVM: Implement pause loop exit logic in SVM")'
> > drops disable pause loop exit/pause filtering capability completely, I
> > guess it is a merge fault by Radim since disable vmexits capabilities and
> > pause loop exit for SVM patchsets are merged at the same time. This patch
> > reintroduces the disable pause loop exit/pause filtering capability support.
> >
> > Reported-by: Haiwei Li <lihaiwei@tencent.com>
> > Tested-by: Haiwei Li <lihaiwei@tencent.com>
> > Fixes: 8566ac8b (KVM: SVM: Implement pause loop exit logic in SVM)
> > Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
> > ---
> > v2 -> v3:
> >  * simplify the condition in init_vmcb()
> >
> >  arch/x86/kvm/svm/svm.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> > index c0da4dd..bf77f90 100644
> > --- a/arch/x86/kvm/svm/svm.c
> > +++ b/arch/x86/kvm/svm/svm.c
> > @@ -1090,7 +1090,7 @@ static void init_vmcb(struct vcpu_svm *svm)
> >       svm->nested.vmcb = 0;
> >       svm->vcpu.arch.hflags = 0;
> >
> > -     if (pause_filter_count) {
> > +     if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
> >               control->pause_filter_count = pause_filter_count;
> >               if (pause_filter_thresh)
> >                       control->pause_filter_thresh = pause_filter_thresh;
> > @@ -2693,7 +2693,7 @@ static int pause_interception(struct vcpu_svm *svm)
> >       struct kvm_vcpu *vcpu = &svm->vcpu;
> >       bool in_kernel = (svm_get_cpl(vcpu) == 0);
> >
> > -     if (pause_filter_thresh)
> > +     if (!kvm_pause_in_guest(vcpu->kvm))
> >               grow_ple_window(vcpu);
> >
> >       kvm_vcpu_on_spin(vcpu, in_kernel);
> > @@ -3780,7 +3780,7 @@ static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu)
> >
> >  static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
> >  {
> > -     if (pause_filter_thresh)
> > +     if (!kvm_pause_in_guest(vcpu->kvm))
> >               shrink_ple_window(vcpu);
> >  }
> >
> > @@ -3958,6 +3958,9 @@ static void svm_vm_destroy(struct kvm *kvm)
> >
> >  static int svm_vm_init(struct kvm *kvm)
> >  {
> > +     if (!pause_filter_count || !pause_filter_thresh)
> > +             kvm->arch.pause_in_guest = true;
> > +
> >       if (avic) {
> >               int ret = avic_vm_init(kvm);
> >               if (ret)
> >
>
> Queued all three, thanks.  Please do send a testcase for patch 1
> however, I only queued it in order to have it in 5.8.

Thanks, will do in the next week, today is too busy. :)

    Wanpeng
diff mbox series

Patch

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c0da4dd..bf77f90 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1090,7 +1090,7 @@  static void init_vmcb(struct vcpu_svm *svm)
 	svm->nested.vmcb = 0;
 	svm->vcpu.arch.hflags = 0;
 
-	if (pause_filter_count) {
+	if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
 		control->pause_filter_count = pause_filter_count;
 		if (pause_filter_thresh)
 			control->pause_filter_thresh = pause_filter_thresh;
@@ -2693,7 +2693,7 @@  static int pause_interception(struct vcpu_svm *svm)
 	struct kvm_vcpu *vcpu = &svm->vcpu;
 	bool in_kernel = (svm_get_cpl(vcpu) == 0);
 
-	if (pause_filter_thresh)
+	if (!kvm_pause_in_guest(vcpu->kvm))
 		grow_ple_window(vcpu);
 
 	kvm_vcpu_on_spin(vcpu, in_kernel);
@@ -3780,7 +3780,7 @@  static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu)
 
 static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
 {
-	if (pause_filter_thresh)
+	if (!kvm_pause_in_guest(vcpu->kvm))
 		shrink_ple_window(vcpu);
 }
 
@@ -3958,6 +3958,9 @@  static void svm_vm_destroy(struct kvm *kvm)
 
 static int svm_vm_init(struct kvm *kvm)
 {
+	if (!pause_filter_count || !pause_filter_thresh)
+		kvm->arch.pause_in_guest = true;
+
 	if (avic) {
 		int ret = avic_vm_init(kvm);
 		if (ret)