linux-kernel - [PATCH v2 18/21] KVM: x86: Treat pending TRIPLE

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Date:   Tue, 14 Jun 2022 20:47:27 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.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, Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: [PATCH v2 18/21] KVM: x86: Treat pending TRIPLE_FAULT requests as
 pending exceptions

Treat pending TRIPLE_FAULTS as pending exceptions.  A triple fault is an
exception for all intents and purposes, it's just not tracked as such
because there's no vector associated the exception.  E.g. if userspace
were to set vcpu->request_interrupt_window while running L2 and L2 hit a
triple fault, a triple fault nested VM-Exit should be synthesized to L1
before exiting to userspace with KVM_EXIT_IRQ_WINDOW_OPEN.

Link: https://lore.kernel.org/all/YoVHAIGcFgJit1qp@google.com
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/x86.c | 3 ---
 arch/x86/kvm/x86.h | 3 ++-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 63ee79da50df..8e54a074b7ff 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12477,9 +12477,6 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
 	if (kvm_xen_has_pending_events(vcpu))
 		return true;
 
-	if (kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu))
-		return true;
-
 	return false;
 }
 
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index eee259e387d3..078765287ec6 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -85,7 +85,8 @@ int kvm_check_nested_events(struct kvm_vcpu *vcpu);
 static inline bool kvm_is_exception_pending(struct kvm_vcpu *vcpu)
 {
 	return vcpu->arch.exception.pending ||
-	       vcpu->arch.exception_vmexit.pending;
+	       vcpu->arch.exception_vmexit.pending ||
+	       kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 }
 
 static inline void kvm_clear_exception_queue(struct kvm_vcpu *vcpu)
-- 
2.36.1.476.g0c4daa206d-goog