linux-kernel - [PATCH 3/8] KVM: selftests: Assert that __vm_get

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Message-ID: <20241220013906.3518334-4-seanjc@google.com>
Date: Thu, 19 Dec 2024 17:39:01 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Anup Patel <anup@...infault.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.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
Subject: [PATCH 3/8] KVM: selftests: Assert that __vm_get_stat() actually
 finds a stat

Fail the test if it attempts to read a stat that doesn't exist, e.g. due
to a typo, or because the test tried to get a stat for the wrong scope.
As is, there's no indiciation of failure and @data is left untouched,
e.g. holds '0' or random stack data in most cases.

Fixes: 8448ec5993be ("KVM: selftests: Add NX huge pages test")
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/kvm_util.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 9138801ecb60..21b5a6261106 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2238,9 +2238,10 @@ void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data,
 
 		read_stat_data(vm->stats_fd, &vm->stats_header, desc,
 			       data, max_elements);
-
-		break;
+		return;
 	}
+
+	TEST_FAIL("Unabled to find stat '%s'", stat_name);
 }
 
 __weak void kvm_arch_vm_post_create(struct kvm_vm *vm)
-- 
2.47.1.613.gc27f4b7a9f-goog