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Tsirkin" , Cindy Lu , Jason Wang Subject: [RFC PATCH v9 03/23] vdpa: delay set_vring_ready after DRIVER_OK Date: Wed, 6 Jul 2022 20:39:48 +0200 Message-Id: <20220706184008.1649478-4-eperezma@redhat.com> In-Reply-To: <20220706184008.1649478-1-eperezma@redhat.com> References: <20220706184008.1649478-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 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=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1657133856582100001 To restore the device in the destination of a live migration we send the commands through control virtqueue. For a device to read CVQ it must have received DRIVER_OK status bit. However this open a window where the device could start receiving packets in rx queue 0 before it receive the RSS configuration. To avoid that, we will not send vring_enable until all configuration is used by the device. As a first step, reverse the DRIVER_OK and SET_VRING_ENABLE steps. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-vdpa.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 66f054a12c..2ee8009594 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -728,13 +728,18 @@ static int vhost_vdpa_get_vq_index(struct vhost_dev *= dev, int idx) return idx; } =20 +/** + * Set ready all vring of the device + * + * @dev: Vhost device + */ static int vhost_vdpa_set_vring_ready(struct vhost_dev *dev) { int i; trace_vhost_vdpa_set_vring_ready(dev); - for (i =3D 0; i < dev->nvqs; ++i) { + for (i =3D 0; i < dev->vq_index_end; ++i) { struct vhost_vring_state state =3D { - .index =3D dev->vq_index + i, + .index =3D i, .num =3D 1, }; vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state); @@ -1097,7 +1102,6 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev= , bool started) if (unlikely(!ok)) { return -1; } - vhost_vdpa_set_vring_ready(dev); } else { ok =3D vhost_vdpa_svqs_stop(dev); if (unlikely(!ok)) { @@ -1111,16 +1115,22 @@ static int vhost_vdpa_dev_start(struct vhost_dev *d= ev, bool started) } =20 if (started) { + int r; + memory_listener_register(&v->listener, &address_space_memory); - return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); + r =3D vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); + if (unlikely(r)) { + return r; + } + vhost_vdpa_set_vring_ready(dev); } else { vhost_vdpa_reset_device(dev); vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER); memory_listener_unregister(&v->listener); - - return 0; } + + return 0; } =20 static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base, --=20 2.31.1