From: Wanpeng Li <kernellwp@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>, kvm <kvm@vger.kernel.org>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v3 3/3] KVM: SVM: Fix disable pause loop exit/pause filtering capability on SVM
Date: Fri, 31 Jul 2020 17:44:45 +0800 [thread overview]
Message-ID: <CANRm+CzgB2G5TqcBYikq3JserkbBkNr5a9Q8Fw8E6s49TtrmvA@mail.gmail.com> (raw)
In-Reply-To: <ae8bf85f-00ee-c59c-e543-e0364481526c@redhat.com>
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
next prev parent reply other threads:[~2020-07-31 9:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-31 3:12 [PATCH v3 1/3] KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled Wanpeng Li
2020-07-31 3:12 ` [PATCH v3 2/3] KVM: LAPIC: Set the TDCR settable bits Wanpeng Li
2020-07-31 3:12 ` [PATCH v3 3/3] KVM: SVM: Fix disable pause loop exit/pause filtering capability on SVM Wanpeng Li
2020-07-31 7:21 ` Paolo Bonzini
2020-07-31 9:44 ` Wanpeng Li [this message]
2020-07-31 7:18 ` [PATCH v3 1/3] KVM: LAPIC: Prevent setting the tscdeadline timer if the lapic is hw disabled Paolo Bonzini
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