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From: Sean Christopherson <seanjc@google.com>
To: Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	 Anup Patel <anup@brainfault.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	 Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	 Christian Borntraeger <borntraeger@linux.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	 Claudio Imbrenda <imbrenda@linux.ibm.com>,
	Sean Christopherson <seanjc@google.com>,
	 Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	 kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
	 linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 3/9] KVM: selftests: Assert that __vm_get_stat() actually finds a stat
Date: Fri, 10 Jan 2025 16:50:43 -0800	[thread overview]
Message-ID: <20250111005049.1247555-4-seanjc@google.com> (raw)
In-Reply-To: <20250111005049.1247555-1-seanjc@google.com>

Fail the test if it attempts to read a stat that doesn't exist, e.g. due
to a typo (hooray, strings), 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@google.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


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  parent reply	other threads:[~2025-01-11  0:53 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-11  0:50 [PATCH v2 0/9] KVM: selftests: Binary stats fixes and infra updates Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 1/9] KVM: selftests: Fix mostly theoretical leak of VM's binary stats FD Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 2/9] KVM: selftests: Close VM's binary stats FD when releasing VM Sean Christopherson
2025-01-11  0:50 ` Sean Christopherson [this message]
2025-01-11  0:50 ` [PATCH v2 4/9] KVM: selftests: Macrofy vm_get_stat() to auto-generate stat name string Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 5/9] KVM: selftests: Add struct and helpers to wrap binary stats cache Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 6/9] KVM: selftests: Get VM's binary stats FD when opening VM Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 7/9] KVM: selftests: Adjust number of files rlimit for all "standard" VMs Sean Christopherson
2025-01-11  0:50 ` [PATCH v2 8/9] KVM: selftests: Add infrastructure for getting vCPU binary stats Sean Christopherson
2025-01-16  5:14   ` Manali Shukla
2025-01-11  0:50 ` [PATCH v2 9/9] KVM: selftests: Add compile-time assertions to guard against stats typos Sean Christopherson
2025-02-15  0:50 ` [PATCH v2 0/9] KVM: selftests: Binary stats fixes and infra updates Sean Christopherson

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