linux-kernel - [PATCH v2] KVM: x86: Fix the intel_pt PMI handling wrongly considered from guest

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Message-Id: <20220521072318.1226928-1-yanfei.xu@intel.com>
Date:   Sat, 21 May 2022 15:23:18 +0800
From:   Yanfei Xu <yanfei.xu@...el.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, wei.w.wang@...el.com,
        kan.liang@...el.com
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] KVM: x86: Fix the intel_pt PMI handling wrongly considered from guest

When kernel handles the vm-exit caused by external interrupts and NMI,
it always set a type of kvm_intr_type to handling_intr_from_guest to
tell if it's dealing an IRQ or NMI. For the PMI scenario, it could be
IRQ or NMI.
However the intel_pt PMI certainly is a NMI PMI, hence using
kvm_handling_nmi_from_guest() to distinguish if the intel_pt PMI comes
from guest is more appropriate. This modification can avoid the host
wrongly considered the intel_pt PMI comes from a guest once the host
intel_pt PMI breaks the handling of vm-exit of external interrupts.

Fixes: db215756ae59 ("KVM: x86: More precisely identify NMI from guest when handling PMI")
Signed-off-by: Yanfei Xu <yanfei.xu@...el.com>
---
v1->v2:
1.Fix vmx_handle_intel_pt_intr() directly instead of changing the generic function.
2.Tune the commit message.

 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 610355b9ccce..378036c1cf94 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7856,7 +7856,7 @@ static unsigned int vmx_handle_intel_pt_intr(void)
 	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
 
 	/* '0' on failure so that the !PT case can use a RET0 static call. */
-	if (!kvm_arch_pmi_in_guest(vcpu))
+	if (!kvm_handling_nmi_from_guest(vcpu))
 		return 0;
 
 	kvm_make_request(KVM_REQ_PMI, vcpu);
-- 
2.32.0