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Tsirkin" , Jason Wang , Stefan Hajnoczi , Parav Pandit Subject: [RFC v2 00/13] Dinamycally switch to vhost shadow virtqueues at vdpa net migration Date: Thu, 12 Jan 2023 18:24:21 +0100 Message-Id: <20230112172434.760850-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.129.124; 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_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: 2.1.29 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 It's possible to migrate vdpa net devices if they are shadowed from the=0D start. But to always shadow the dataplane is effectively break its host=0D passthrough, so its not convenient in vDPA scenarios.=0D =0D This series enables dynamically switching to shadow mode only at=0D migration time. This allow full data virtqueues passthrough all the=0D time qemu is not migrating.=0D =0D Successfully tested with vdpa_sim_net (but it needs some patches, I=0D will send them soon) and qemu emulated device with vp_vdpa with=0D some restrictions:=0D * No CVQ.=0D * VIRTIO_RING_F_STATE patches.=0D * Expose _F_SUSPEND, but ignore it and suspend on ring state fetch like=0D DPDK.=0D =0D Comments are welcome, especially in the patcheswith RFC in the message.=0D =0D v2:=0D - Use a migration listener instead of a memory listener to know when=0D the migration starts.=0D - Add stuff not picked with ASID patches, like enable rings after=0D driver_ok=0D - Add rewinding on the migration src, not in dst=0D - v1 at https://lists.gnu.org/archive/html/qemu-devel/2022-08/msg01664.html= =0D =0D Eugenio P=C3=A9rez (13):=0D vdpa: fix VHOST_BACKEND_F_IOTLB_ASID flag check=0D vdpa net: move iova tree creation from init to start=0D vdpa: copy cvq shadow_data from data vqs, not from x-svq=0D vdpa: rewind at get_base, not set_base=0D vdpa net: add migration blocker if cannot migrate cvq=0D vhost: delay set_vring_ready after DRIVER_OK=0D vdpa: delay set_vring_ready after DRIVER_OK=0D vdpa: Negotiate _F_SUSPEND feature=0D vdpa: add feature_log parameter to vhost_vdpa=0D vdpa net: allow VHOST_F_LOG_ALL=0D vdpa: add vdpa net migration state notifier=0D vdpa: preemptive kick at enable=0D vdpa: Conditionally expose _F_LOG in vhost_net devices=0D =0D include/hw/virtio/vhost-backend.h | 4 +=0D include/hw/virtio/vhost-vdpa.h | 1 +=0D hw/net/vhost_net.c | 25 ++-=0D hw/virtio/vhost-vdpa.c | 64 +++++---=0D hw/virtio/vhost.c | 3 +=0D net/vhost-vdpa.c | 247 +++++++++++++++++++++++++-----=0D 6 files changed, 278 insertions(+), 66 deletions(-)=0D =0D -- =0D 2.31.1=0D =0D