linux-kernel - [PATCH 41/42] KVM: selftests: Use the common cpuid() helper in cpu_vendor_string

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Message-Id: <20220604012058.1972195-42-seanjc@google.com>
Date:   Sat,  4 Jun 2022 01:20:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Jim Mattson <jmattson@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 41/42] KVM: selftests: Use the common cpuid() helper in cpu_vendor_string_is()

Use cpuid() to get CPUID.0x0 in cpu_vendor_string_is(), thus eliminating
the last open coded usage of CPUID (ignoring debug_regs.c, which emits
CPUID from the guest to trigger a VM-Exit and doesn't actually care about
the results of CPUID).

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/x86_64/processor.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 6e8c8781996c..5cb73b2f9978 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1012,15 +1012,9 @@ void kvm_x86_state_cleanup(struct kvm_x86_state *state)
 static bool cpu_vendor_string_is(const char *vendor)
 {
 	const uint32_t *chunk = (const uint32_t *)vendor;
-	int eax, ebx, ecx, edx;
-	const int leaf = 0;
-
-	__asm__ __volatile__(
-		"cpuid"
-		: /* output */ "=a"(eax), "=b"(ebx),
-		  "=c"(ecx), "=d"(edx)
-		: /* input */ "0"(leaf), "2"(0));
+	uint32_t eax, ebx, ecx, edx;
 
+	cpuid(0, &eax, &ebx, &ecx, &edx);
 	return (ebx == chunk[0] && edx == chunk[1] && ecx == chunk[2]);
 }
 
-- 
2.36.1.255.ge46751e96f-goog