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x86/cpu: Detect VMX features on Intel, Centaur and Zhaoxin CPUs

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Add an entry in struct cpuinfo_x86 to track VMX capabilities and fill
the capabilities during IA32_FEAT_CTL MSR initialization.

Make the VMX capabilities dependent on IA32_FEAT_CTL and
X86_FEATURE_NAMES so as to avoid unnecessary overhead on CPUs that can't
possibly support VMX, or when /proc/cpuinfo is not available.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20191221044513.21680-11-sean.j.christopherson@intel.com
This commit is contained in:
Sean Christopherson
2019-12-20 20:45:04 -08:00
committed by Borislav Petkov
parent 159348784f
commit b47ce1fed4
5 changed files with 89 additions and 0 deletions
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3
arch/x86/include/asm/processor.h
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@@ -85,6 +85,9 @@ struct cpuinfo_x86 {
#ifdef CONFIG_X86_64
/* Number of 4K pages in DTLB/ITLB combined(in pages): */
int x86_tlbsize;
#endif
#ifdef CONFIG_X86_VMX_FEATURE_NAMES
__u32 vmx_capability[NVMXINTS];
#endif
__u8 x86_virt_bits;
__u8 x86_phys_bits;