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Subject[PATCH v2 19/22] KVM: x86: WARN on injected+pending exception even in nested case
Date
From: Sean Christopherson <sean.j.christopherson@intel.com>

WARN if a pending exception is coincident with an injected exception
before calling check_nested_events() so that the WARN will fire even if
inject_pending_event() bails early because check_nested_events() detects
the conflict. Bailing early isn't problematic (quite the opposite), but
suppressing the WARN is undesirable as it could mask a bug elsewhere in
KVM.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200423022550.15113-11-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/x86.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e8469db6ccae..44b9d834621c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7693,6 +7693,9 @@ static int inject_pending_event(struct kvm_vcpu *vcpu)
kvm_x86_ops.set_irq(vcpu);
}

+ WARN_ON_ONCE(vcpu->arch.exception.injected &&
+ vcpu->arch.exception.pending);
+
/*
* Call check_nested_events() even if we reinjected a previous event
* in order for caller to determine if it should require immediate-exit
@@ -7711,7 +7714,6 @@ static int inject_pending_event(struct kvm_vcpu *vcpu)
vcpu->arch.exception.has_error_code,
vcpu->arch.exception.error_code);

- WARN_ON_ONCE(vcpu->arch.exception.injected);
vcpu->arch.exception.pending = false;
vcpu->arch.exception.injected = true;

--
2.18.2

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