diff mbox series

[12/16] x86/virt: Drop unnecessary check on extended CPUID level in cpu_has_svm()

Message ID 20221201232655.290720-13-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series x86/reboot: KVM: Clean up "emergency" virt code | expand

Commit Message

Sean Christopherson Dec. 1, 2022, 11:26 p.m. UTC 
Drop the explicit check on the extended CPUID level in cpu_has_svm(), the
kernel's cached CPUID info will leave the entire SVM leaf unset if said
leaf is not supported by hardware.  Prior to using cached information,
the check was needed to avoid false positives due to Intel's rather crazy
CPUID behavior of returning the values of the maximum supported leaf if
the specified leaf is unsupported.

Fixes: 682a8108872f ("x86/kvm/svm: Simplify cpu_has_svm()")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/include/asm/virtext.h | 6 ------
 1 file changed, 6 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
index 0b373543514f..eddc0eeb836f 100644
--- a/arch/x86/include/asm/virtext.h
+++ b/arch/x86/include/asm/virtext.h
@@ -39,12 +39,6 @@  static inline int cpu_has_svm(const char **msg)
 		return 0;
 	}
 
-	if (boot_cpu_data.extended_cpuid_level < SVM_CPUID_FUNC) {
-		if (msg)
-			*msg = "can't execute cpuid_8000000a";
-		return 0;
-	}
-
 	if (!boot_cpu_has(X86_FEATURE_SVM)) {
 		if (msg)
 			*msg = "svm not available";