linux-kernel - [PATCH] KVM: VMX: Use accessor to read vmcs.INTR

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Date:   Mon, 27 Apr 2020 10:18:37 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: VMX: Use accessor to read vmcs.INTR_INFO when handling exception

Use vmx_get_intr_info() when grabbing the cached vmcs.INTR_INFO in
handle_exception_nmi() to ensure the cache isn't stale.  Bypassing the
caching accessor doesn't cause any known issues as the cache is always
refreshed by handle_exception_nmi_irqoff(), but the whole point of
adding the proper caching mechanism was to avoid such dependencies.

Fixes: 8791585837f6 ("KVM: VMX: Cache vmcs.EXIT_INTR_INFO using arch avail_reg flags")
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 3ab6ca6062ce..7bddcb24f6f3 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4677,7 +4677,7 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
 	u32 vect_info;
 
 	vect_info = vmx->idt_vectoring_info;
-	intr_info = vmx->exit_intr_info;
+	intr_info = vmx_get_intr_info(vcpu);
 
 	if (is_machine_check(intr_info) || is_nmi(intr_info))
 		return 1; /* handled by handle_exception_nmi_irqoff() */
-- 
2.26.0