The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 830f01b089b12bbe93bd55f2d62837253012a30e Mon Sep 17 00:00:00 2001

From: Wanpeng Li wanpengli@tencent.com Date: Fri, 31 Jul 2020 11:12:21 +0800 Subject: [PATCH] KVM: SVM: Fix disable pause loop exit/pause filtering capability on SVM

'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 Message-Id: 1596165141-28874-3-git-send-email-wanpengli@tencent.com Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini pbonzini@redhat.com

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index c0da4dd78ac5..5bbf76189afa 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)