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Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 08/10] Revert "virtio-pci: decouple the single vector from the interrupt process" Message-ID: <20220110071547.195669-9-mst@redhat.com> References: <20220110071547.195669-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20220110071547.195669-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.597, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This reverts commit 316011b8a74e777eb3ba03171cd701a291c28867. --- hw/virtio/virtio-pci.c | 163 +++++++++++++++++++---------------------- 1 file changed, 74 insertions(+), 89 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 7201cf3dc1..4bdb6e5694 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -677,6 +677,7 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev, } static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, + unsigned int queue_no, unsigned int vector) { VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; @@ -739,103 +740,87 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no, return 0; } -static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no) -{ - unsigned int vector; - int ret; - EventNotifier *n; - PCIDevice *dev = &proxy->pci_dev; - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); - - ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); - if (ret < 0) { - return ret; - } - if (vector >= msix_nr_vectors_allocated(dev)) { - return 0; - } - ret = kvm_virtio_pci_vq_vector_use(proxy, vector); - if (ret < 0) { - goto undo; - } - /* - * If guest supports masking, set up irqfd now. - * Otherwise, delay until unmasked in the frontend. - */ - if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); - if (ret < 0) { - kvm_virtio_pci_vq_vector_release(proxy, vector); - goto undo; - } - } - - return 0; -undo: - - vector = virtio_queue_vector(vdev, queue_no); - if (vector >= msix_nr_vectors_allocated(dev)) { - return ret; - } - if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); - if (ret < 0) { - return ret; - } - kvm_virtio_pci_irqfd_release(proxy, n, vector); - } - return ret; -} static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) { - int queue_no; - int ret = 0; - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - - for (queue_no = 0; queue_no < nvqs; queue_no++) { - if (!virtio_queue_get_num(vdev, queue_no)) { - return -1; - } - ret = kvm_virtio_pci_vector_use_one(proxy, queue_no); - } - return ret; -} - - -static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, - int queue_no) -{ - VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - unsigned int vector; - EventNotifier *n; - int ret; - VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); PCIDevice *dev = &proxy->pci_dev; - - ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); - if (ret < 0) { - return; - } - if (vector >= msix_nr_vectors_allocated(dev)) { - return; - } - if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - kvm_virtio_pci_irqfd_release(proxy, n, vector); - } - kvm_virtio_pci_vq_vector_release(proxy, vector); -} - -static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) -{ - int queue_no; VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); + unsigned int vector; + int ret, queue_no; + EventNotifier *n; for (queue_no = 0; queue_no < nvqs; queue_no++) { if (!virtio_queue_get_num(vdev, queue_no)) { break; } - kvm_virtio_pci_vector_release_one(proxy, queue_no); + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } + if (vector >= msix_nr_vectors_allocated(dev)) { + continue; + } + ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector); + if (ret < 0) { + goto undo; + } + /* If guest supports masking, set up irqfd now. + * Otherwise, delay until unmasked in the frontend. + */ + if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { + ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); + if (ret < 0) { + kvm_virtio_pci_vq_vector_release(proxy, vector); + goto undo; + } + } + } + return 0; + +undo: + while (--queue_no >= 0) { + vector = virtio_queue_vector(vdev, queue_no); + if (vector >= msix_nr_vectors_allocated(dev)) { + continue; + } + if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } + kvm_virtio_pci_irqfd_release(proxy, n, vector); + } + kvm_virtio_pci_vq_vector_release(proxy, vector); + } + return ret; +} + +static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) +{ + PCIDevice *dev = &proxy->pci_dev; + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); + unsigned int vector; + int queue_no; + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); + EventNotifier *n; + int ret ; + for (queue_no = 0; queue_no < nvqs; queue_no++) { + if (!virtio_queue_get_num(vdev, queue_no)) { + break; + } + ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + break; + } + if (vector >= msix_nr_vectors_allocated(dev)) { + continue; + } + /* If guest supports masking, clean up irqfd now. + * Otherwise, it was cleaned when masked in the frontend. + */ + if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { + kvm_virtio_pci_irqfd_release(proxy, n, vector); + } + kvm_virtio_pci_vq_vector_release(proxy, vector); } } -- MST