KVM: x86: Check the right feature bit for MSR_KVM_ASYNC_PF_ACK access

MSR_KVM_ASYNC_PF_ACK MSR is part of interrupt based asynchronous page fault
interface and not the original (deprecated) KVM_FEATURE_ASYNC_PF. This is
stated in Documentation/virt/kvm/msr.rst.

Fixes: 66570e966dd9 ("kvm: x86: only provide PV features if enabled in guest's CPUID")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Message-Id: <20210722123018.260035-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a4fd106..4116567 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3407,7 +3407,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                        return 1;
                break;
        case MSR_KVM_ASYNC_PF_ACK:
-               if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
+               if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
                        return 1;
                if (data & 0x1) {
                        vcpu->arch.apf.pageready_pending = false;
@@ -3746,7 +3746,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                msr_info->data = vcpu->arch.apf.msr_int_val;
                break;
        case MSR_KVM_ASYNC_PF_ACK:
-               if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF))
+               if (!guest_pv_has(vcpu, KVM_FEATURE_ASYNC_PF_INT))
                        return 1;
 
                msr_info->data = 0;