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Tsirkin" , yin31149@gmail.com, Jason Wang , Yajun Wu , Zhu Lingshan , Lei Yang , Dragos Tatulea , Juan Quintela , Laurent Vivier , si-wei.liu@oracle.com, Gautam Dawar Subject: [RFC PATCH 07/18] vdpa: move iotlb_batch_begin_sent to vhost_vdpa_shared Date: Thu, 19 Oct 2023 16:34:44 +0200 Message-Id: <20231019143455.2377694-8-eperezma@redhat.com> In-Reply-To: <20231019143455.2377694-1-eperezma@redhat.com> References: <20231019143455.2377694-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Next patches will register the vhost_vdpa memory listener while the VM is migrating at the destination, so we can map the memory to the device before stopping the VM at the source. The main goal is to reduce the downtime. However, the destination QEMU is unaware of which vhost_vdpa device will register its memory_listener. If the source guest has CVQ enabled, it will be the CVQ device. Otherwise, it will be the first one. Move the iotlb_batch_begin_sent member to VhostVDPAShared so all vhost_vdpa can use it, rather than always in the first / last vhost_vdpa. Signed-off-by: Eugenio Pérez --- include/hw/virtio/vhost-vdpa.h | 3 ++- hw/virtio/vhost-vdpa.c | 8 ++++---- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h index 796a180afa..05219bbcf7 100644 --- a/include/hw/virtio/vhost-vdpa.h +++ b/include/hw/virtio/vhost-vdpa.h @@ -38,6 +38,8 @@ typedef struct vhost_vdpa_shared { /* IOVA mapping used by the Shadow Virtqueue */ VhostIOVATree *iova_tree; + bool iotlb_batch_begin_sent; + /* Vdpa must send shadow addresses as IOTLB key for data queues, not GPA */ bool shadow_data; } VhostVDPAShared; @@ -45,7 +47,6 @@ typedef struct vhost_vdpa_shared { typedef struct vhost_vdpa { int index; uint32_t msg_type; - bool iotlb_batch_begin_sent; uint32_t address_space_id; MemoryListener listener; uint64_t acked_features; diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 298aefd065..3da5a19a9e 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -161,11 +161,11 @@ static void vhost_vdpa_listener_begin_batch(struct vhost_vdpa *v) static void vhost_vdpa_iotlb_batch_begin_once(struct vhost_vdpa *v) { if (v->dev->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH) && - !v->iotlb_batch_begin_sent) { + !v->shared->iotlb_batch_begin_sent) { vhost_vdpa_listener_begin_batch(v); } - v->iotlb_batch_begin_sent = true; + v->shared->iotlb_batch_begin_sent = true; } static void vhost_vdpa_listener_commit(MemoryListener *listener) @@ -179,7 +179,7 @@ static void vhost_vdpa_listener_commit(MemoryListener *listener) return; } - if (!v->iotlb_batch_begin_sent) { + if (!v->shared->iotlb_batch_begin_sent) { return; } @@ -192,7 +192,7 @@ static void vhost_vdpa_listener_commit(MemoryListener *listener) fd, errno, strerror(errno)); } - v->iotlb_batch_begin_sent = false; + v->shared->iotlb_batch_begin_sent = false; } static void vhost_vdpa_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)