linux-kernel - Re: [PATCH] KVM: nVMX: promptly process interrupts delivered while in guest mode

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Message-ID: <YXBwAbbRJFfEVGxY@google.com>
Date:   Wed, 20 Oct 2021 19:37:37 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        wanpengli@...cent.com, stable@...r.kernel.org
Subject: Re: [PATCH] KVM: nVMX: promptly process interrupts delivered while
 in guest mode

On Wed, Oct 20, 2021, Paolo Bonzini wrote:
> Since commit c300ab9f08df ("KVM: x86: Replace late check_nested_events() hack with
> more precise fix") there is no longer the certainty that check_nested_events()
> tries to inject an external interrupt vmexit to L1 on every call to vcpu_enter_guest.
> Therefore, even in that case we need to set KVM_REQ_EVENT.  This ensures
> that inject_pending_event() is called, and from there kvm_check_nested_events().
> 
> Fixes: c300ab9f08df ("KVM: x86: Replace late check_nested_events() hack with more precise fix")
> Cc: stable@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>