linux-kernel - Re: [PATCH v3 3/7] KVM: nVMX: Make an event request when pending an MTF nested VM-Exit

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Date:   Mon, 22 Aug 2022 10:52:23 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        mlevitsk@...hat.com, seanjc@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH v3 3/7] KVM: nVMX: Make an event request when pending an
 MTF nested VM-Exit

On Mon, Aug 22, 2022 at 10:08 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> From: Sean Christopherson <seanjc@...gle.com>
>
> Set KVM_REQ_EVENT when MTF becomes pending to ensure that KVM will run
> through inject_pending_event() and thus vmx_check_nested_events() prior
> to re-entering the guest.
>
> MTF currently works by virtue of KVM's hack that calls
> kvm_check_nested_events() from kvm_vcpu_running(), but that hack will
> be removed in the near future.  Until that call is removed, the patch
> introduces no functional change.
>
> Fixes: 5ef8acbdd687 ("KVM: nVMX: Emulate MTF when performing instruction emulation")
> Cc: stable@...r.kernel.org
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
What happens if live migration occurs before the KVM_REQ_EVENT is processed?