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| author | Jim Mattson <jmattson@google.com> | 2019-03-27 13:15:36 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-05-24 21:27:06 +0200 |
| commit | 32a243df82c8dc04ccba7fc6c6564ae9261cb738 (patch) | |
| tree | 92b54972850c5423e5559ec0f9ff193dddaf77a3 | |
| parent | 319f6f97e3a16c38795168753db8740f77b156c9 (diff) | |
| download | lwn-32a243df82c8dc04ccba7fc6c6564ae9261cb738.tar.gz lwn-32a243df82c8dc04ccba7fc6c6564ae9261cb738.zip | |
kvm: x86: Include multiple indices with CPUID leaf 0x8000001d
Per the APM, "CPUID Fn8000_001D_E[D,C,B,A]X reports cache topology
information for the cache enumerated by the value passed to the
instruction in ECX, referred to as Cache n in the following
description. To gather information for all cache levels, software must
repeatedly execute CPUID with 8000_001Dh in EAX and ECX set to
increasing values beginning with 0 until a value of 00h is returned in
the field CacheType (EAX[4:0]) indicating no more cache descriptions
are available for this processor."
The termination condition is the same as leaf 4, so we can reuse that
code block for leaf 0x8000001d.
Fixes: 8765d75329a38 ("KVM: X86: Extend CPUID range to include new leaf")
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 80a642a0143d..3c96ce8fbb96 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -456,8 +456,9 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, } break; } - /* function 4 has additional index. */ - case 4: { + /* functions 4 and 0x8000001d have additional index. */ + case 4: + case 0x8000001d: { int i, cache_type; entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; @@ -702,8 +703,6 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, break; case 0x8000001a: break; - case 0x8000001d: - break; /*Add support for Centaur's CPUID instruction*/ case 0xC0000000: /*Just support up to 0xC0000004 now*/ |