From: Like Xu <likexu@xxxxxxxxxxx>
With the help of xstate_get_guest_group_perm(), KVM can exclude unpermitted
xfeatures in cpuid.0xd.0.eax, in which case the corresponding xfeatures
sizes should also be matched to the permitted xfeatures.
Fixing this inconsistency by introducing a local variable with the same
name also helps to fix cpuid.0xd.1.ebx and later leaf-by-leaf queries.
Fixes: 445ecdf79be0 ("kvm: x86: Exclude unpermitted xfeatures at KVM_GET_SUPPORTED_CPUID")
Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 3902c28fb6cb..3dcd58a138a9 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -887,12 +887,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
}
break;
case 0xd: {
- u64 guest_perm = xstate_get_guest_group_perm();
+ u64 supported_xcr0 = supported_xcr0 & xstate_get_guest_group_perm();
- entry->eax &= supported_xcr0 & guest_perm;
+ entry->eax &= supported_xcr0;
entry->ebx = xstate_required_size(supported_xcr0, false);
entry->ecx = entry->ebx;
- entry->edx &= (supported_xcr0 & guest_perm) >> 32;
+ entry->edx &= supported_xcr0 >> 32;
if (!supported_xcr0)
break;
--
2.33.1
