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x86/virt: Drop unnecessary check on extended CPUID level in cpu_has_svm() 

[ Upstream commit 5df8ecfe36 ]

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: 682a810887 ("x86/kvm/svm: Simplify cpu_has_svm()")
Link: https://lore.kernel.org/r/20230721201859.2307736-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sean Christopherson 2023-07-21 13:18:52 -07:00 committed by Greg Kroah-Hartman
parent 6522397e75
commit 6a43e0d623
1 changed files with 0 additions and 6 deletions
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6
arch/x86/include/asm/virtext.h
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@ -101,12 +101,6 @@ 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";