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 c0da4dd..5bbf761 100644 (file)
--- 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)