linux-kernel - [PATCH 34/42] KVM: selftests: Use this_cpu

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Date:   Sat,  4 Jun 2022 01:20:50 +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 34/42] KVM: selftests: Use this_cpu_has() to detect SVM
 support in L1

Replace an evil open coded instance of querying CPUID from L1 with
this_cpu_has(X86_FEATURE_SVM).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../testing/selftests/kvm/include/x86_64/svm_util.h | 13 -------------
 tools/testing/selftests/kvm/x86_64/smm_test.c       |  4 ++--
 tools/testing/selftests/kvm/x86_64/state_test.c     |  2 +-
 3 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86_64/svm_util.h b/tools/testing/selftests/kvm/include/x86_64/svm_util.h
index f48806d26989..a339b537a575 100644
--- a/tools/testing/selftests/kvm/include/x86_64/svm_util.h
+++ b/tools/testing/selftests/kvm/include/x86_64/svm_util.h
@@ -13,9 +13,6 @@
 #include "svm.h"
 #include "processor.h"
 
-#define CPUID_SVM_BIT		2
-#define CPUID_SVM		BIT_ULL(CPUID_SVM_BIT)
-
 #define SVM_EXIT_EXCP_BASE	0x040
 #define SVM_EXIT_HLT		0x078
 #define SVM_EXIT_MSR		0x07c
@@ -52,16 +49,6 @@ struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva);
 void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
 void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
 
-static inline bool cpu_has_svm(void)
-{
-	u32 eax = 0x80000001, ecx;
-
-	asm("cpuid" :
-	    "=a" (eax), "=c" (ecx) : "0" (eax) : "ebx", "edx");
-
-	return ecx & CPUID_SVM;
-}
-
 int open_sev_dev_path_or_exit(void);
 
 #endif /* SELFTEST_KVM_SVM_UTILS_H */
diff --git a/tools/testing/selftests/kvm/x86_64/smm_test.c b/tools/testing/selftests/kvm/x86_64/smm_test.c
index 40581704f129..7937db5b1037 100644
--- a/tools/testing/selftests/kvm/x86_64/smm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/smm_test.c
@@ -83,7 +83,7 @@ static void guest_code(void *arg)
 	sync_with_host(4);
 
 	if (arg) {
-		if (cpu_has_svm()) {
+		if (this_cpu_has(X86_FEATURE_SVM)) {
 			generic_svm_setup(svm, l2_guest_code,
 					  &l2_guest_stack[L2_GUEST_STACK_SIZE]);
 		} else {
@@ -99,7 +99,7 @@ static void guest_code(void *arg)
 
 		sync_with_host(7);
 
-		if (cpu_has_svm()) {
+		if (this_cpu_has(X86_FEATURE_SVM)) {
 			run_guest(svm->vmcb, svm->vmcb_gpa);
 			run_guest(svm->vmcb, svm->vmcb_gpa);
 		} else {
diff --git a/tools/testing/selftests/kvm/x86_64/state_test.c b/tools/testing/selftests/kvm/x86_64/state_test.c
index 35e96d7a6ba1..d37e25229fe5 100644
--- a/tools/testing/selftests/kvm/x86_64/state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/state_test.c
@@ -142,7 +142,7 @@ static void __attribute__((__flatten__)) guest_code(void *arg)
 	GUEST_SYNC(2);
 
 	if (arg) {
-		if (cpu_has_svm())
+		if (this_cpu_has(X86_FEATURE_SVM))
 			svm_l1_guest_code(arg);
 		else
 			vmx_l1_guest_code(arg);
-- 
2.36.1.255.ge46751e96f-goog