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AJvYcCUopJbqJFxJyEDXU2z5MhN9x9ZgVs8Uk5aTK5AM5WGEjk90/06q/wk2KYb0OX38G73M9ACkOW5+6IUoOhc=@vger.kernel.org X-Gm-Message-State: AOJu0YyeP0QbpLku9gz0DQunb1fpeslj4rUK8obHxrYSqzKmR0qLDRi7 gpOAinqozJsJcnZMU4OPUvObWlWg2PR4Wo6vvYebKIDn1ZwAqEe5tr4rGs+G9hYg8ctVN/SA9ef ydx+h7g== X-Google-Smtp-Source: AGHT+IHb+Zv/4CcMgQT32iC66PSsxBVu4fJyVtFcuECRvVY6yAdTVQgUPpLO4I1bFnUpFw9nkCh9cXpZUsg= X-Received: from pjbkl3.prod.google.com ([2002:a17:90b:4983:b0:311:c197:70a4]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2ec8:b0:311:a314:c2ca with SMTP id 98e67ed59e1d1-313c0667dbemr976034a91.6.1749682077795; Wed, 11 Jun 2025 15:47:57 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 11 Jun 2025 15:45:39 -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: <20250611224604.313496-38-seanjc@google.com> Subject: [PATCH v3 36/62] KVM: x86: Don't update IRTE entries when old and new routes were !MSI 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" Skip the entirety of IRTE updates on a GSI routing change if neither the old nor the new routing is for an MSI, i.e. if the neither routing setup allows for posting to a vCPU. If the IRTE isn't already host controlled, KVM has bigger problems. Signed-off-by: Sean Christopherson --- arch/x86/kvm/irq.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index 43e85ebc0d5b..4119c1e880e7 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -618,6 +618,10 @@ void kvm_arch_update_irqfd_routing(struct kvm_kernel_i= rqfd *irqfd, struct kvm_kernel_irq_routing_entry *old, struct kvm_kernel_irq_routing_entry *new) { + if (new->type !=3D KVM_IRQ_ROUTING_MSI && + old->type !=3D KVM_IRQ_ROUTING_MSI) + return; + if (old->type =3D=3D KVM_IRQ_ROUTING_MSI && new->type =3D=3D KVM_IRQ_ROUTING_MSI && !memcmp(&old->msi, &new->msi, sizeof(new->msi))) --=20 2.50.0.rc1.591.g9c95f17f64-goog