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Mon, 7 Sep 2020 10:49:19 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-108.pek2.redhat.com [10.72.12.108]) by smtp.corp.redhat.com (Postfix) with ESMTP id A2CF910013C4; Mon, 7 Sep 2020 10:49:17 +0000 (UTC) From: Jason Wang To: mst@redhat.com, qemu-devel@nongnu.org Subject: [PATCH 3/3] vhost-vdpa: batch updating IOTLB mappings Date: Mon, 7 Sep 2020 18:49:03 +0800 Message-Id: <20200907104903.31551-4-jasowang@redhat.com> In-Reply-To: <20200907104903.31551-1-jasowang@redhat.com> References: <20200907104903.31551-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/06 22:29:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-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: elic@nvidia.com, Jason Wang , lulu@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" To speed up the memory mapping updating between vhost-vDPA and vDPA device driver, this patch passes the IOTLB batching flags via IOTLB API. Two new flags was introduced, VHOST_IOTLB_BATCH_BEGIN is a hint that a bathced IOTLB updating may be initiated from the userspace. VHOST_IOTLB_BATCH_END is a hint that userspace has finished the updating: VHOST_IOTLB_BATCH_BEGIN VHOST_IOTLB_UPDATE/VHOST_IOTLB_INVALIDATE ... VHOST_IOTLB_BATCH_END Vhost-vDPA can then know that all mappings has been set and can do optimization like passing all the mappings to the vDPA device driver. Signed-off-by: Jason Wang --- hw/virtio/vhost-vdpa.c | 66 ++++++++++++++++++++++++++++++++++ include/hw/virtio/vhost-vdpa.h | 1 + 2 files changed, 67 insertions(+) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 4580f3efd8..ba1ae3ea44 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -78,6 +78,46 @@ static int vhost_vdpa_dma_unmap(struct vhost_vdpa *v, hwaddr iova, return ret; } +static void vhost_vdpa_listener_begin(MemoryListener *listener) +{ + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener); + struct vhost_dev *dev = v->dev; + struct vhost_msg_v2 msg; + int fd = v->device_fd; + + if (!(dev->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH))) { + return; + } + + msg.type = v->msg_type; + msg.iotlb.type = VHOST_IOTLB_BATCH_BEGIN; + + if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { + error_report("failed to write, fd=%d, errno=%d (%s)", + fd, errno, strerror(errno)); + } +} + +static void vhost_vdpa_listener_commit(MemoryListener *listener) +{ + struct vhost_vdpa *v = container_of(listener, struct vhost_vdpa, listener); + struct vhost_dev *dev = v->dev; + struct vhost_msg_v2 msg; + int fd = v->device_fd; + + if (!(dev->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH))) { + return; + } + + msg.type = v->msg_type; + msg.iotlb.type = VHOST_IOTLB_BATCH_END; + + if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { + error_report("failed to write, fd=%d, errno=%d (%s)", + fd, errno, strerror(errno)); + } +} + static void vhost_vdpa_listener_region_add(MemoryListener *listener, MemoryRegionSection *section) { @@ -191,6 +231,8 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener, * depends on the addnop(). */ static const MemoryListener vhost_vdpa_memory_listener = { + .begin = vhost_vdpa_listener_begin, + .commit = vhost_vdpa_listener_commit, .region_add = vhost_vdpa_listener_region_add, .region_del = vhost_vdpa_listener_region_del, }; @@ -226,6 +268,7 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque) assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); v = opaque; + v->dev = dev; dev->opaque = opaque ; vhost_vdpa_call(dev, VHOST_GET_FEATURES, &features); dev->backend_features = features; @@ -280,6 +323,28 @@ static int vhost_vdpa_set_features(struct vhost_dev *dev, return !(status & VIRTIO_CONFIG_S_FEATURES_OK); } +static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) +{ + uint64_t features; + uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | + 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH; + int r; + + if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) { + return 0; + } + + features &= f; + r = vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &features); + if (r) { + return 0; + } + + dev->backend_cap = features; + + return 0; +} + int vhost_vdpa_get_device_id(struct vhost_dev *dev, uint32_t *device_id) { @@ -452,6 +517,7 @@ const VhostOps vdpa_ops = { .vhost_set_vring_kick = vhost_vdpa_set_vring_kick, .vhost_set_vring_call = vhost_vdpa_set_vring_call, .vhost_get_features = vhost_vdpa_get_features, + .vhost_set_backend_cap = vhost_vdpa_set_backend_cap, .vhost_set_owner = vhost_vdpa_set_owner, .vhost_set_vring_endian = NULL, .vhost_backend_memslots_limit = vhost_vdpa_memslots_limit, diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h index 6455663388..9b81a409da 100644 --- a/include/hw/virtio/vhost-vdpa.h +++ b/include/hw/virtio/vhost-vdpa.h @@ -18,6 +18,7 @@ typedef struct vhost_vdpa { int device_fd; uint32_t msg_type; MemoryListener listener; + struct vhost_dev *dev; } VhostVDPA; extern AddressSpace address_space_memory;