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bh=EcCzrKSJCUwPbt76tLp4aCJ/tjnA4Nnzfj4IZ9JFgvQ=; b=NPtC0OsIEcuZqSNDKVtjEpWe/Uko4NioHQqRUH7obrrSFOQo1ZP5TlNOTbDx/2tee6NlGO W7y3EIRJ/FnVrvcJbnwk2fALTZopVEmRKr45m6/6HxzVkJb1bAN60FRsH5PEnOGFlHaTzC ej97+d69o+sbbFqBxY4fKWDuGATsmME= X-MC-Unique: gGWxmnwOPaeGaElRrozrYQ-1 From: Jason Wang To: mst@redhat.com, qemu-devel@nongnu.org Subject: [PATCH V2 2/2] vhost-vdpa: map virtqueue notification area if possible Date: Wed, 2 Jun 2021 16:41:06 +0800 Message-Id: <20210602084106.43186-3-jasowang@redhat.com> In-Reply-To: <20210602084106.43186-1-jasowang@redhat.com> References: <20210602084106.43186-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@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=jasowang@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: , Cc: si-wei.liu@oracle.com, elic@nvidia.com, lingshan.zhu@intel.com, Jason Wang Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This patch implements the vq notification mapping support for vhost-vDPA. This is simply done by using mmap()/munmap() for the vhost-vDPA fd during device start/stop. For the device without notification mapping support, we fall back to eventfd based notification gracefully. Signed-off-by: Jason Wang Reviewed-by: Si-Wei Liu --- Changes since v1: - use dev->vq_index to calculate the virtqueue index - remove the unused host_notifier_set --- hw/virtio/vhost-vdpa.c | 85 ++++++++++++++++++++++++++++++++++ include/hw/virtio/vhost-vdpa.h | 6 +++ 2 files changed, 91 insertions(+) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index dd4321bac2..f9a86afe64 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -285,12 +285,95 @@ static int vhost_vdpa_init(struct vhost_dev *dev, voi= d *opaque) return 0; } =20 +static void vhost_vdpa_host_notifier_uninit(struct vhost_dev *dev, + int queue_index) +{ + size_t page_size =3D qemu_real_host_page_size; + struct vhost_vdpa *v =3D dev->opaque; + VirtIODevice *vdev =3D dev->vdev; + VhostVDPAHostNotifier *n; + + n =3D &v->notifier[queue_index]; + + if (n->addr) { + virtio_queue_set_host_notifier_mr(vdev, queue_index, &n->mr, false= ); + object_unparent(OBJECT(&n->mr)); + munmap(n->addr, page_size); + n->addr =3D NULL; + } +} + +static void vhost_vdpa_host_notifiers_uninit(struct vhost_dev *dev, int n) +{ + int i; + + for (i =3D 0; i < n; i++) { + vhost_vdpa_host_notifier_uninit(dev, i); + } +} + +static int vhost_vdpa_host_notifier_init(struct vhost_dev *dev, int queue_= index) +{ + size_t page_size =3D qemu_real_host_page_size; + struct vhost_vdpa *v =3D dev->opaque; + VirtIODevice *vdev =3D dev->vdev; + VhostVDPAHostNotifier *n; + int fd =3D v->device_fd; + void *addr; + char *name; + + vhost_vdpa_host_notifier_uninit(dev, queue_index); + + n =3D &v->notifier[queue_index]; + + addr =3D mmap(NULL, page_size, PROT_WRITE, MAP_SHARED, fd, + queue_index * page_size); + if (addr =3D=3D MAP_FAILED) { + goto err; + } + + name =3D g_strdup_printf("vhost-vdpa/host-notifier@%p mmaps[%d]", + v, queue_index); + memory_region_init_ram_device_ptr(&n->mr, OBJECT(vdev), name, + page_size, addr); + g_free(name); + + if (virtio_queue_set_host_notifier_mr(vdev, queue_index, &n->mr, true)= ) { + munmap(addr, page_size); + goto err; + } + n->addr =3D addr; + + return 0; + +err: + return -1; +} + +static void vhost_vdpa_host_notifiers_init(struct vhost_dev *dev) +{ + int i; + + for (i =3D dev->vq_index; i < dev->vq_index + dev->nvqs; i++) { + if (vhost_vdpa_host_notifier_init(dev, i)) { + goto err; + } + } + + return; + +err: + vhost_vdpa_host_notifiers_uninit(dev, i); + return; +} + static int vhost_vdpa_cleanup(struct vhost_dev *dev) { struct vhost_vdpa *v; assert(dev->vhost_ops->backend_type =3D=3D VHOST_BACKEND_TYPE_VDPA); v =3D dev->opaque; trace_vhost_vdpa_cleanup(dev, v); + vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); memory_listener_unregister(&v->listener); =20 dev->opaque =3D NULL; @@ -467,6 +550,7 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, = bool started) if (started) { uint8_t status =3D 0; memory_listener_register(&v->listener, &address_space_memory); + vhost_vdpa_host_notifiers_init(dev); vhost_vdpa_set_vring_ready(dev); vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status); @@ -476,6 +560,7 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, = bool started) vhost_vdpa_reset_device(dev); vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER); + vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); memory_listener_unregister(&v->listener); =20 return 0; diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h index 9b81a409da..56bef30ec2 100644 --- a/include/hw/virtio/vhost-vdpa.h +++ b/include/hw/virtio/vhost-vdpa.h @@ -14,11 +14,17 @@ =20 #include "hw/virtio/virtio.h" =20 +typedef struct VhostVDPAHostNotifier { + MemoryRegion mr; + void *addr; +} VhostVDPAHostNotifier; + typedef struct vhost_vdpa { int device_fd; uint32_t msg_type; MemoryListener listener; struct vhost_dev *dev; + VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX]; } VhostVDPA; =20 extern AddressSpace address_space_memory; --=20 2.25.1