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bh=5vXyByKTCZKBHoCmVZuTuGfo8z7nKEWFNhjcJpcr9G4=; b=JTLsTl7FsEha35H6/6eCdwo4EsIB1WES83+KdpX/EsSCZ5z/HD6b/artS037+R8QZp5SAy CQy+tD4qpKIh0BP49DHT+kEXDk9Zwa8JYYog4sv+t+uk48iy/Ndy9KrPmrc5VcQjpxu5Ce FFMLjeAh+oOOrCbHFTlO/1zieXoglK4= X-MC-Unique: TqktAIygM-CaZoNvH0H9aw-1 From: Cindy Lu To: lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org Subject: [PATCH v7 09/10] virtio-pci: add support for configure interrupt Date: Wed, 2 Jun 2021 11:47:49 +0800 Message-Id: <20210602034750.23377-10-lulu@redhat.com> In-Reply-To: <20210602034750.23377-1-lulu@redhat.com> References: <20210602034750.23377-1-lulu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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=216.205.24.124; envelope-from=lulu@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.371, 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 Signed-off-by: Cindy Lu --- hw/virtio/virtio-pci.c | 63 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 60 insertions(+), 3 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index f863c89de6..1e03f11a85 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -717,7 +717,8 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy *prox= y, int queue_no, VirtQueue *vq; =20 if (queue_no =3D=3D VIRTIO_CONFIG_IRQ_IDX) { - return -1; + *n =3D virtio_get_config_notifier(vdev); + *vector =3D vdev->config_vector; } else { if (!virtio_queue_get_num(vdev, queue_no)) { return -1; @@ -764,6 +765,10 @@ static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *p= roxy, int nvqs) return ret; } =20 +static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy) +{ + return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX); +} =20 static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, int queue_no) @@ -792,6 +797,28 @@ static void kvm_virtio_pci_vector_release(VirtIOPCIPro= xy *proxy, int nvqs) } } =20 +static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy) +{ + kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX); +} +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_notifier_fd_handler(vdev, VIRTIO_CONFIG_IRQ_IDX, true, = true); + kvm_virtio_pci_vector_config_use(proxy); + } else { + virtio_set_notifier_fd_handler(vdev, VIRTIO_CONFIG_IRQ_IDX, + 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, @@ -873,9 +900,17 @@ 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, VIRTIO_CONFIG_IRQ_IDX, + 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, VIRTIO_CONFIG_IRQ_IDX, vector, n); undo: vq =3D virtio_vector_first_queue(vdev, vector); while (vq && unmasked >=3D 0) { @@ -909,6 +944,8 @@ 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, VIRTIO_CONFIG_IRQ_IDX, vector, n); } =20 static void virtio_pci_vector_poll(PCIDevice *dev, @@ -942,6 +979,20 @@ 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, VIRTIO_CONFIG_IRQ_IDX)) { + 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, @@ -1002,6 +1053,7 @@ static int virtio_pci_set_guest_notifiers(DeviceState= *d, int nvqs, bool assign) msix_unset_vector_notifiers(&proxy->pci_dev); if (proxy->vector_irqfd) { kvm_virtio_pci_vector_release(proxy, nvqs); + kvm_virtio_pci_vector_config_release(proxy); g_free(proxy->vector_irqfd); proxy->vector_irqfd =3D NULL; } @@ -1029,6 +1081,10 @@ 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, @@ -1045,7 +1101,8 @@ 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