linux-kernel - [PATCH v2 33/42] KVM: selftests: Use this_cpu

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Message-Id: <20220614200707.3315957-34-seanjc@google.com>
Date:   Tue, 14 Jun 2022 20:06:58 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: [PATCH v2 33/42] KVM: selftests: Use this_cpu_has() in CR4/CPUID sync test

Use this_cpu_has() to query OSXSAVE from the L1 guest in the CR4=>CPUID
sync test.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/include/x86_64/processor.h       |  3 ---
 .../selftests/kvm/x86_64/cr4_cpuid_sync_test.c     | 14 ++------------
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index be2ce21926db..f56a3a7a4246 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -158,9 +158,6 @@ struct kvm_x86_cpu_feature {
 #define X86_FEATURE_KVM_HC_MAP_GPA_RANGE	KVM_X86_CPU_FEATURE(0x40000001, 0, EAX, 16)
 #define X86_FEATURE_KVM_MIGRATION_CONTROL	KVM_X86_CPU_FEATURE(0x40000001, 0, EAX, 17)
 
-/* CPUID.1.ECX */
-#define CPUID_OSXSAVE		(1ul << 27)
-
 /* Page table bitfield declarations */
 #define PTE_PRESENT_MASK        BIT_ULL(0)
 #define PTE_WRITABLE_MASK       BIT_ULL(1)
diff --git a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
index 092fedbe6f52..a310674b6974 100644
--- a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
+++ b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
@@ -21,19 +21,9 @@
 
 static inline bool cr4_cpuid_is_sync(void)
 {
-	int func, subfunc;
-	uint32_t eax, ebx, ecx, edx;
-	uint64_t cr4;
+	uint64_t cr4 = get_cr4();
 
-	func = 0x1;
-	subfunc = 0x0;
-	__asm__ __volatile__("cpuid"
-			     : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
-			     : "a"(func), "c"(subfunc));
-
-	cr4 = get_cr4();
-
-	return (!!(ecx & CPUID_OSXSAVE)) == (!!(cr4 & X86_CR4_OSXSAVE));
+	return (this_cpu_has(X86_FEATURE_OSXSAVE) == !!(cr4 & X86_CR4_OSXSAVE));
 }
 
 static void guest_code(void)
-- 
2.36.1.476.g0c4daa206d-goog