Pass CPUID 0x80000005 (L1 cache and TLB info).
CPUID 0x80000006 (L2 cache and TLB and L3 cache info) has been returned
since commit 43d05de2bee7 ("KVM: pass through CPUID(0x80000006)").
Enumerating both 0x80000005 and 0x80000006 with KVM_GET_SUPPORTED_CPUID
would be better than reporting either, and 0x80000005 could be helpful
for VMM to pass it to KVM_SET_CPUID{,2} for the same reason with
0x80000006..
Signed-off-by: Takahiro Itazuri <itazur@xxxxxxxxxx>
---
Discussion was made a bit on
https://lore.kernel.org/all/20230712170258.75355-1-itazur@xxxxxxxxxx/.
If there is any reason that leaf 0x80000005 should not be enumerated or
dropping leaf 0x80000006 is preferred, please feel free to share your
thoughts.
---
arch/x86/kvm/cpuid.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0c9660a07b23..54a5b256c484 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1152,6 +1152,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
cpuid_entry_override(entry, CPUID_8000_0001_EDX);
cpuid_entry_override(entry, CPUID_8000_0001_ECX);
break;
+ case 0x80000005:
+ /* Pass host L1 cache and TLB info. */
+ break;
case 0x80000006:
/* Drop reserved bits, pass host L2 cache and TLB info. */
entry->edx &= ~GENMASK(17, 16);
--
2.38.0
