linux-kernel - [PATCH v2 05/13] KVM: selftests: Check for a potential unhandled exception iff KVM

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Message-ID: <20240911204158.2034295-6-seanjc@google.com>
Date: Wed, 11 Sep 2024 13:41:50 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Anup Patel <anup@...infault.org>, Paolo Bonzini <pbonzini@...hat.com>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Sean Christopherson <seanjc@...gle.com>, James Houghton <jthoughton@...gle.com>
Subject: [PATCH v2 05/13] KVM: selftests: Check for a potential unhandled
 exception iff KVM_RUN succeeded

Don't check for an unhandled exception if KVM_RUN failed, e.g. if it
returned errno=EFAULT, as reporting unhandled exceptions is done via a
ucall, i.e. requires KVM_RUN to exit cleanly.  Theoretically, checking
for a ucall on a failed KVM_RUN could get a false positive, e.g. if there
were stale data in vcpu->run from a previous exit.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/kvm_util.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 56b170b725b3..0e25011d9b51 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1719,7 +1719,8 @@ int _vcpu_run(struct kvm_vcpu *vcpu)
 		rc = __vcpu_run(vcpu);
 	} while (rc == -1 && errno == EINTR);
 
-	assert_on_unhandled_exception(vcpu);
+	if (!rc)
+		assert_on_unhandled_exception(vcpu);
 
 	return rc;
 }
-- 
2.46.0.598.g6f2099f65c-goog