linux-kernel - Re: [PATCH] KVM: x86: Do not change ICR on write to APIC_SELF

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Message-ID: <YhekNhrK7VKW1jDV@google.com>
Date:   Thu, 24 Feb 2022 15:28:54 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Chao Gao <chao.gao@...el.com>
Subject: Re: [PATCH] KVM: x86: Do not change ICR on write to APIC_SELF_IPI

On Thu, Feb 24, 2022, Paolo Bonzini wrote:
> Emulating writes to SELF_IPI with a write to ICR has an unwanted side effect:
> the value of ICR in vAPIC page gets changed.  The lists SELF_IPI as write-only,
                                                   ^
						   |- SDM

> with no associated MMIO offset, so any write should have no visible side
> effect in the vAPIC page.
> 
> Reported-by: Chao Gao <chao.gao@...el.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

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