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SubjectRe: [PATCH v2 06/10] KVM: x86: acknowledgment mechanism for async pf page ready notifications
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On 25/05/20 16:41, Vitaly Kuznetsov wrote:
> + case MSR_KVM_ASYNC_PF_ACK:
> + if (data & 0x1) {
> + vcpu->arch.apf.pageready_pending = false;
> + kvm_check_async_pf_completion(vcpu);
> + }
> + break;
> case MSR_KVM_STEAL_TIME:
>
> if (unlikely(!sched_info_on()))
> @@ -3183,6 +3189,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> case MSR_KVM_ASYNC_PF_INT:
> msr_info->data = vcpu->arch.apf.msr_int_val;
> break;
> + case MSR_KVM_ASYNC_PF_ACK:
> + msr_info->data = 0;
> + break;

How is the pageready_pending flag migrated? Should we revert the
direction of the MSR (i.e. read the flag, and write 0 to clear it)?

Paolo

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