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([2001:b07:6468:f312:436:e17d:1fd9:d92a]) by smtp.gmail.com with ESMTPSA id o15sm25943715wra.83.2020.01.15.09.51.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jan 2020 09:51:28 -0800 (PST) Subject: Re: [PATCH v4 2/2] KVM: LAPIC: micro-optimize fixed mode ipi delivery To: Wanpeng Li , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel References: <1574306232-872-1-git-send-email-wanpengli@tencent.com> <1574306232-872-2-git-send-email-wanpengli@tencent.com> From: Paolo Bonzini Message-ID: Date: Wed, 15 Jan 2020 18:51:27 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <1574306232-872-2-git-send-email-wanpengli@tencent.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/11/19 04:17, Wanpeng Li wrote: > From: Wanpeng Li > > This patch optimizes redundancy logic before fixed mode ipi is delivered > in the fast path, broadcast handling needs to go slow path, so the delivery > mode repair can be delayed to before slow path. > > Signed-off-by: Wanpeng Li > --- > arch/x86/kvm/irq_comm.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c > index 8ecd48d..aa88156 100644 > --- a/arch/x86/kvm/irq_comm.c > +++ b/arch/x86/kvm/irq_comm.c > @@ -52,15 +52,15 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, > unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]; > unsigned int dest_vcpus = 0; > > + if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map)) > + return r; > + > if (irq->dest_mode == 0 && irq->dest_id == 0xff && > kvm_lowest_prio_delivery(irq)) { > printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); > irq->delivery_mode = APIC_DM_FIXED; > } > > - if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map)) > - return r; > - > memset(dest_vcpu_bitmap, 0, sizeof(dest_vcpu_bitmap)); > > kvm_for_each_vcpu(i, vcpu, kvm) { > Applied. Paolo