linux-kernel - [PATCH v4 3/9] KVM: nSVM: reset nested_run_pending upon nested_svm_vmrun

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Message-Id: <20200710141157.1640173-4-vkuznets@redhat.com>
Date:   Fri, 10 Jul 2020 16:11:51 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/9] KVM: nSVM: reset nested_run_pending upon nested_svm_vmrun_msrpm() failure

WARN_ON_ONCE(svm->nested.nested_run_pending) in nested_svm_vmexit()
will fire if nested_run_pending remains '1' but it doesn't really
need to, we are already failing and not going to run nested guest.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/svm/nested.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index e424bce13e6c..1cc8592b1820 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -468,6 +468,8 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
 	enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb);
 
 	if (!nested_svm_vmrun_msrpm(svm)) {
+		svm->nested.nested_run_pending = 0;
+
 		svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
 		svm->vmcb->control.exit_code_hi = 0;
 		svm->vmcb->control.exit_info_1  = 0;
-- 
2.25.4