On Fri, 2024-05-17 at 10:38 -0700, Sean Christopherson wrote:
> Clear KVM's PV feature cache prior when processing a new guest CPUID so
> that KVM doesn't keep a stale cache entry if userspace does KVM_SET_CPUID2
> multiple times, once with a PV features entry, and a second time without.
>
> Fixes: 66570e966dd9 ("kvm: x86: only provide PV features if enabled in guest's CPUID")
> Cc: Oliver Upton <oliver.upton@xxxxxxxxx>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
> arch/x86/kvm/cpuid.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index f756a91a3f2f..be1c8f43e090 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -246,6 +246,8 @@ void kvm_update_pv_runtime(struct kvm_vcpu *vcpu)
> {
> struct kvm_cpuid_entry2 *best = kvm_find_kvm_cpuid_features(vcpu);
>
> + vcpu->arch.pv_cpuid.features = 0;
> +
> /*
> * save the feature bitmap to avoid cpuid lookup for every PV
> * operation
Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Best regards,
Maxim Levitsky
