KVM: SVM: Skip intercepted PAUSE instructions after emulation

Skip PAUSE after interception to avoid unnecessarily re-executing the
instruction in the guest, e.g. after regaining control post-yield.
This is a benign bug as KVM disables PAUSE interception if filtering is
off, including the case where pause_filter_count is set to zero.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210205005750.3841462-10-seanjc@google.com>
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 100cf24..74f2658 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2980,7 +2980,7 @@ static int pause_interception(struct kvm_vcpu *vcpu)
                grow_ple_window(vcpu);
 
        kvm_vcpu_on_spin(vcpu, in_kernel);
-       return 1;
+       return kvm_skip_emulated_instruction(vcpu);
 }
 
 static int invpcid_interception(struct kvm_vcpu *vcpu)