linux-kernel - Re: [PATCH 4/6] KVM: SVM: fix races in the AVIC incomplete IPI delivery to vCPUs

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Message-ID: <ad666891-a67e-f126-da14-6de382bf0659@redhat.com>
Date:   Fri, 10 Dec 2021 12:37:54 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm@...r.kernel.org,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>, Wanpeng Li <wanpengli@...cent.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH 4/6] KVM: SVM: fix races in the AVIC incomplete IPI
 delivery to vCPUs

On 12/9/21 16:38, Sean Christopherson wrote:
> +                       if (svm_deliver_avic_intr(vcpu, -1) {
> +                               vcpu->arch.apic->irr_pending = true;
> +                               kvm_make_request(KVM_REQ_EVENT, vcpu);
> +                       }

This is a good idea, but the details depends on patch 3 so I'll send a 
series of my own.

Paolo