linux-kernel - Re: [PATCH 01/11] Revert "svm: Add warning message for AVIC IPI invalid target"

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Date:   Mon, 7 Feb 2022 17:44:43 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zeng Guang <guang.zeng@...el.com>,
        Chao Gao <chao.gao@...el.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: Re: [PATCH 01/11] Revert "svm: Add warning message for AVIC IPI
 invalid target"

On 2/4/22 22:41, Sean Christopherson wrote:
> Remove a WARN on an "AVIC IPI invalid target" exit, the WARN is trivial
> to trigger from guest as it will fail on any destination APIC ID that
> doesn't exist from the guest's perspective.
> 
> Don't bother recording anything in the kernel log, the common tracepoint
> for kvm_avic_incomplete_ipi() is sufficient for debugging.
> 
> This reverts commit 37ef0c4414c9743ba7f1af4392f0a27a99649f2a.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>   arch/x86/kvm/svm/avic.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index 90364d02f22a..ecc81c48c0ca 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -345,8 +345,6 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
>   		avic_kick_target_vcpus(vcpu->kvm, apic, icrl, icrh);
>   		break;
>   	case AVIC_IPI_FAILURE_INVALID_TARGET:
> -		WARN_ONCE(1, "Invalid IPI target: index=%u, vcpu=%d, icr=%#0x:%#0x\n",
> -			  index, vcpu->vcpu_id, icrh, icrl);
>   		break;
>   	case AVIC_IPI_FAILURE_INVALID_BACKING_PAGE:
>   		WARN_ONCE(1, "Invalid backing page\n");

Queued for 5.17, thanks.

Paolo