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x86/cpufeatures: Assign dedicated feature word for CPUID_0x8000001F[EAX]

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commit fb35d30fe5b06cc24444f0405da8fbe0be5330d1 upstream.

Collect the scattered SME/SEV related feature flags into a dedicated
word.  There are now five recognized features in CPUID.0x8000001F.EAX,
with at least one more on the horizon (SEV-SNP).  Using a dedicated word
allows KVM to use its automagic CPUID adjustment logic when reporting
the set of supported features to userspace.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Link: https://lkml.kernel.org/r/20210122204047.2860075-2-seanjc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson
2021-01-22 12:40:46 -08:00
committed by Greg Kroah-Hartman
orang tua baf6d6c39e
melakukan 437fa179f2
8 mengubah file dengan 27 tambahan dan 17 penghapusan
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3
arch/x86/kernel/cpu/common.c
Melihat File

@@ -966,6 +966,9 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
if (c->extended_cpuid_level >= 0x8000000a)
c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);
if (c->extended_cpuid_level >= 0x8000001f)
c->x86_capability[CPUID_8000_001F_EAX] = cpuid_eax(0x8000001f);
init_scattered_cpuid_features(c);
init_speculation_control(c);

5
arch/x86/kernel/cpu/scattered.c
Melihat File

@@ -41,11 +41,6 @@ static const struct cpuid_bit cpuid_bits[] = {
{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 },
{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 },
{ X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 },
{ X86_FEATURE_SME, CPUID_EAX, 0, 0x8000001f, 0 },
{ X86_FEATURE_SEV, CPUID_EAX, 1, 0x8000001f, 0 },
{ X86_FEATURE_SEV_ES, CPUID_EAX, 3, 0x8000001f, 0 },
{ X86_FEATURE_SME_COHERENT, CPUID_EAX, 10, 0x8000001f, 0 },
{ X86_FEATURE_VM_PAGE_FLUSH, CPUID_EAX, 2, 0x8000001f, 0 },
{ 0, 0, 0, 0, 0 }
};