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bh=M4cmPbiEwEGftO8mrNWEPj2CgiRFKvrX7qJYFZEnNDU=; b=F2v/JwqXzcNiIRrmNcisEOLo8boVgF8EqcpYxgtW3fJNbs0wW0qvh3rOuIM6wNCBBbQ7Ji zq2gExW2fhUkfN2LujDD2n5Yj2DdN2vszYHSo+ZgIN7zwdrch8pGVuthUZy5UOpfbq1P64 aeM/AOdI8hepgwFbDM2gz3oWWhvPK5s= X-MC-Unique: 7Q9rRR5vMVmFQyVxjy1HOA-1 From: Cindy Lu To: lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org Subject: [PATCH v6 7/9] virtio-pci: add support for configure interrupt Date: Tue, 27 Apr 2021 11:39:49 +0800 Message-Id: <20210427033951.29805-8-lulu@redhat.com> In-Reply-To: <20210427033951.29805-1-lulu@redhat.com> References: <20210427033951.29805-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=lulu@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lulu@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.219, 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_H4=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" Add support for configure interrupt, use kvm_irqfd_assign and set the gsi to kernel. When the configure notifier was eventfd_signal by host kernel, this will finally inject an msix interrupt to guest --- hw/virtio/virtio-pci.c | 186 ++++++++++++++++++++++++++--------------- 1 file changed, 120 insertions(+), 66 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 2b7e6cc0d9..07d28dd367 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -664,12 +664,10 @@ static uint32_t virtio_read_config(PCIDevice *pci_dev, } =20 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, - unsigned int queue_no, unsigned int vector) { VirtIOIRQFD *irqfd =3D &proxy->vector_irqfd[vector]; int ret; - if (irqfd->users =3D=3D 0) { ret =3D kvm_irqchip_add_msi_route(kvm_state, vector, &proxy->pci_d= ev); if (ret < 0) { @@ -708,93 +706,120 @@ static void kvm_virtio_pci_irqfd_release(VirtIOPCIPr= oxy *proxy, ret =3D kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->vir= q); assert(ret =3D=3D 0); } - -static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) + static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no, + EventNotifier **n, unsigned int *vec= tor) { PCIDevice *dev =3D &proxy->pci_dev; VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); - VirtioDeviceClass *k =3D VIRTIO_DEVICE_GET_CLASS(vdev); - unsigned int vector; - int ret, queue_no; VirtQueue *vq; - EventNotifier *n; - for (queue_no =3D 0; queue_no < nvqs; queue_no++) { + + if (queue_no =3D=3D -1) { + *n =3D virtio_get_config_notifier(vdev); + *vector =3D vdev->config_vector; + } else { if (!virtio_queue_get_num(vdev, queue_no)) { - break; - } - vector =3D virtio_queue_vector(vdev, queue_no); - if (vector >=3D msix_nr_vectors_allocated(dev)) { - continue; - } - ret =3D 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) { - vq =3D virtio_get_queue(vdev, queue_no); - n =3D virtio_queue_get_guest_notifier(vq); - ret =3D kvm_virtio_pci_irqfd_use(proxy, n, vector); - if (ret < 0) { - kvm_virtio_pci_vq_vector_release(proxy, vector); - goto undo; - } + return -1; } + *vector =3D virtio_queue_vector(vdev, queue_no); + vq =3D virtio_get_queue(vdev, queue_no); + *n =3D virtio_queue_get_guest_notifier(vq); + } + if (*vector >=3D msix_nr_vectors_allocated(dev)) { + return -1; } return 0; +} =20 +static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_= no) +{ + unsigned int vector; + int ret; + EventNotifier *n; + ret =3D virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + return ret; + } + ret =3D kvm_virtio_pci_vq_vector_use(proxy, vector); + if (ret < 0) { + goto undo; + } + ret =3D kvm_virtio_pci_irqfd_use(proxy, n, vector); + if (ret < 0) { + goto undo; + } + return 0; undo: - while (--queue_no >=3D 0) { - vector =3D virtio_queue_vector(vdev, queue_no); - if (vector >=3D msix_nr_vectors_allocated(dev)) { - continue; - } - if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { - vq =3D virtio_get_queue(vdev, queue_no); - n =3D virtio_queue_get_guest_notifier(vq); - kvm_virtio_pci_irqfd_release(proxy, n, vector); - } - kvm_virtio_pci_vq_vector_release(proxy, vector); + 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 =3D 0; + for (queue_no =3D 0; queue_no < nvqs; queue_no++) { + ret =3D kvm_virtio_pci_vector_use_one(proxy, queue_no); } return ret; } =20 -static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) +static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy) +{ + return kvm_virtio_pci_vector_use_one(proxy, -1); + } + +static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, + int queue_no) { - PCIDevice *dev =3D &proxy->pci_dev; VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); unsigned int vector; - int queue_no; - VirtioDeviceClass *k =3D VIRTIO_DEVICE_GET_CLASS(vdev); - VirtQueue *vq; EventNotifier *n; + int ret; + VirtioDeviceClass *k =3D VIRTIO_DEVICE_GET_CLASS(vdev); + ret =3D virtio_pci_get_notifier(proxy, queue_no, &n, &vector); + if (ret < 0) { + 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; + for (queue_no =3D 0; queue_no < nvqs; queue_no++) { - if (!virtio_queue_get_num(vdev, queue_no)) { - break; - } - vector =3D virtio_queue_vector(vdev, queue_no); - if (vector >=3D 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) { - vq =3D virtio_get_queue(vdev, queue_no); - n =3D virtio_queue_get_guest_notifier(vq); - kvm_virtio_pci_irqfd_release(proxy, n, vector); - } - kvm_virtio_pci_vq_vector_release(proxy, vector); + kvm_virtio_pci_vector_release_one(proxy, queue_no); } } =20 +static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy) +{ + kvm_virtio_pci_vector_release_one(proxy, -1); +} +static int virtio_pci_set_config_notifier(DeviceState *d, bool assign) +{ + VirtIOPCIProxy *proxy =3D to_virtio_pci_proxy(d); + VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); + EventNotifier *notifier =3D virtio_get_config_notifier(vdev); + int r =3D 0; + if (assign) { + r =3D event_notifier_init(notifier, 0); + virtio_set_config_notifier_fd_handler(vdev, true, true); + kvm_virtio_pci_vector_config_use(proxy); + } else { + virtio_set_config_notifier_fd_handler(vdev, false, true); + kvm_virtio_pci_vector_config_release(proxy); + event_notifier_cleanup(notifier); + } + return r; +} static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, unsigned int queue_no, unsigned int vector, MSIMessage msg, - EventNotifier *n) + EventNotifier *n) { VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); VirtioDeviceClass *k =3D VIRTIO_DEVICE_GET_CLASS(vdev); @@ -871,9 +896,16 @@ static int virtio_pci_vector_unmask(PCIDevice *dev, un= signed vector, } vq =3D virtio_vector_next_queue(vq); } - + n =3D virtio_get_config_notifier(vdev); + ret =3D virtio_pci_vq_vector_unmask(proxy, -1, vector, msg, n); + if (ret < 0) { + goto config_undo; + } return 0; =20 + config_undo: + n =3D virtio_get_config_notifier(vdev); + virtio_pci_vq_vector_mask(proxy, -1, vector, n); undo: vq =3D virtio_vector_first_queue(vdev, vector); while (vq && unmasked >=3D 0) { @@ -907,6 +939,8 @@ static void virtio_pci_vector_mask(PCIDevice *dev, unsi= gned vector) } vq =3D virtio_vector_next_queue(vq); } + n =3D virtio_get_config_notifier(vdev); + virtio_pci_vq_vector_mask(proxy, -1, vector, n); } =20 static void virtio_pci_vector_poll(PCIDevice *dev, @@ -920,7 +954,7 @@ static void virtio_pci_vector_poll(PCIDevice *dev, unsigned int vector; EventNotifier *notifier; VirtQueue *vq; - + /*check for every queue*/ for (queue_no =3D 0; queue_no < proxy->nvqs_with_notifiers; queue_no++= ) { if (!virtio_queue_get_num(vdev, queue_no)) { break; @@ -940,6 +974,21 @@ static void virtio_pci_vector_poll(PCIDevice *dev, msix_set_pending(dev, vector); } } + /*check for config interrupt*/ + + vector =3D vdev->config_vector; + notifier =3D virtio_get_config_notifier(vdev); + if (vector < vector_start || vector >=3D vector_end || + !msix_is_masked(dev, vector)) { + return; + } + if (k->guest_notifier_pending) { + if (k->guest_notifier_pending(vdev, -1)) { + msix_set_pending(dev, vector); + } + } else if (event_notifier_test_and_clear(notifier)) { + msix_set_pending(dev, vector); + } } =20 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assig= n, @@ -1027,6 +1076,10 @@ static int virtio_pci_set_guest_notifiers(DeviceStat= e *d, int nvqs, bool assign) goto assign_error; } } + r =3D virtio_pci_set_config_notifier(d, assign); + if (r < 0) { + goto config_error; + } r =3D msix_set_vector_notifiers(&proxy->pci_dev, virtio_pci_vector_unmask, virtio_pci_vector_mask, @@ -1043,7 +1096,8 @@ notifiers_error: assert(assign); kvm_virtio_pci_vector_release(proxy, nvqs); } - + config_error: + kvm_virtio_pci_vector_config_release(proxy); assign_error: /* We get here on assignment failure. Recover by undoing for VQs 0 .. = n. */ assert(assign); --=20 2.21.3