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AJvYcCWVnz9Vhq8ne6GKcFfVIz94ZFtEZGdPxGB1VlmLTBYzIBE3RyI1AOx+mb/7CLOU6/aiM+guraHB2ZNy7gw=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4Vgu4GGbARXruboSqQ8H2bif7Bkvgrw2awiYRKZi1Ty9b/S/n 9/fkcksKTvmPMePcP1WuKZb/5nCHRmcSddQnGPqwHAwO/dSjlPXhVlM/YCZWQ6FEZuiFZKsllE0 9IGRREQ== X-Google-Smtp-Source: AGHT+IGf03w35WpWXu537xHWr4U/N7R14xnxNpvZmT8HfbsZ9X3mUH7UkRwX/TiEroCP15FbAA6qEaYzrj4= X-Received: from pjtd16.prod.google.com ([2002:a17:90b:50:b0:312:dbc:f731]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5408:b0:311:9c9a:58ca with SMTP id 98e67ed59e1d1-313c0688525mr1173665a91.8.1749682093424; Wed, 11 Jun 2025 15:48:13 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 11 Jun 2025 15:45:48 -0700 In-Reply-To: <20250611224604.313496-2-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250611224604.313496-2-seanjc@google.com> X-Mailer: git-send-email 2.50.0.rc1.591.g9c95f17f64-goog Message-ID: <20250611224604.313496-47-seanjc@google.com> Subject: [PATCH v3 45/62] KVM: SVM: Don't check for assigned device(s) when activating AVIC From: Sean Christopherson To: Marc Zyngier , Oliver Upton , Sean Christopherson , Paolo Bonzini , Joerg Roedel , David Woodhouse , Lu Baolu Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Sairaj Kodilkar , Vasant Hegde , Maxim Levitsky , Joao Martins , Francesco Lavra , David Matlack Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Don't short-circuit IRTE updating when (de)activating AVIC based on the VM having assigned devices, as nothing prevents AVIC (de)activation from racing with device (de)assignment. And from a performance perspective, bailing early when there is no assigned device doesn't add much, as ir_list_lock will never be contended if there's no assigned device. Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/avic.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index dadd982b03c0..ab7fb8950cc0 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -732,9 +732,6 @@ static int avic_set_pi_irte_mode(struct kvm_vcpu *vcpu,= bool activate) struct vcpu_svm *svm =3D to_svm(vcpu); struct kvm_kernel_irqfd *irqfd; =20 - if (!kvm_arch_has_assigned_device(vcpu->kvm)) - return 0; - /* * Here, we go through the per-vcpu ir_list to update all existing * interrupt remapping table entry targeting this vcpu. --=20 2.50.0.rc1.591.g9c95f17f64-goog