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Reply-To: Sean Christopherson <seanjc@google.com>
Date: Fri, 17 May 2024 10:38:42 -0700
In-Reply-To: <20240517173926.965351-1-seanjc@google.com>
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Subject: [PATCH v2 05/49] KVM: selftests: Assert that the @cpuid passed to
 get_cpuid_entry() is non-NULL
From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Sean Christopherson <seanjc@google.com>, 
	Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, 
	Hou Wenlong <houwenlong.hwl@antgroup.com>, Kechen Lu <kechenl@nvidia.com>, 
	Oliver Upton <oliver.upton@linux.dev>, Maxim Levitsky <mlevitsk@redhat.com>, 
	Binbin Wu <binbin.wu@linux.intel.com>, Yang Weijiang <weijiang.yang@intel.com>, 
	Robert Hoo <robert.hoo.linux@gmail.com>
Content-Type: text/plain; charset="UTF-8"

Add a sanity check in get_cpuid_entry() to provide a friendlier error than
a segfault when a test developer tries to use a vCPU CPUID helper on a
barebones vCPU.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/lib/x86_64/processor.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index c664e446136b..f0f3434d767e 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1141,6 +1141,8 @@ const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid,
 {
 	int i;
 
+	TEST_ASSERT(cpuid, "Must do vcpu_init_cpuid() first (or equivalent)");
+
 	for (i = 0; i < cpuid->nent; i++) {
 		if (cpuid->entries[i].function == function &&
 		    cpuid->entries[i].index == index)
-- 
2.45.0.215.g3402c0e53f-goog