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@xxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
Reviewed-by: Marc Orr <marcorr@xxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index fd3951638ae4..d22bba0b2ecc 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -455,8 +455,9 @@ 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;
@@ -701,8 +702,6 @@ 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*/
--
2.21.0.392.gf8f6787159e-goog
