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Tsirkin" , Dragos Tatulea , Yajun Wu , Juan Quintela , Laurent Vivier , Stefano Garzarella , Parav Pandit , Lei Yang , si-wei.liu@oracle.com Subject: [RFC PATCH v2 07/10] vdpa: set backend capabilities at vhost_vdpa_init Date: Tue, 28 Nov 2023 11:43:00 +0100 Message-Id: <20231128104303.3314000-8-eperezma@redhat.com> In-Reply-To: <20231128104303.3314000-1-eperezma@redhat.com> References: <20231128104303.3314000-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 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: -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, 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-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1701168249395000003 The backend does not reset them until the vdpa file descriptor is closed so there is no harm in doing it only once. This allows the destination of a live migration to premap memory in batches, using VHOST_BACKEND_F_IOTLB_BATCH. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-vdpa.c | 50 ++++++++++++++++-------------------------- 1 file changed, 19 insertions(+), 31 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 449c3794b2..43f7c382b1 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -587,11 +587,25 @@ static int vhost_vdpa_init(struct vhost_dev *dev, voi= d *opaque, Error **errp) struct vhost_vdpa *v =3D opaque; assert(dev->vhost_ops->backend_type =3D=3D VHOST_BACKEND_TYPE_VDPA); trace_vhost_vdpa_init(dev, v->shared, opaque); + uint64_t backend_features; + uint64_t qemu_backend_features =3D 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG= _V2 | + 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH= | + 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID | + 0x1ULL << VHOST_BACKEND_F_SUSPEND; int ret; =20 v->dev =3D dev; dev->opaque =3D opaque ; v->shared->listener =3D vhost_vdpa_memory_listener; + + if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &backend_features= )) { + return -EFAULT; + } + + backend_features &=3D qemu_backend_features; + + dev->backend_cap =3D backend_features; + v->shared->backend_cap =3D backend_features; vhost_vdpa_init_svq(dev, v); =20 error_propagate(&dev->migration_blocker, v->migration_blocker); @@ -599,6 +613,11 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void= *opaque, Error **errp) return 0; } =20 + ret =3D vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &backend_feat= ures); + if (ret) { + return -EFAULT; + } + /* * If dev->shadow_vqs_enabled at initialization that means the device = has * been started with x-svq=3Don, so don't block migration @@ -829,36 +848,6 @@ static int vhost_vdpa_set_features(struct vhost_dev *d= ev, return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK); } =20 -static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) -{ - struct vhost_vdpa *v =3D dev->opaque; - - uint64_t features; - uint64_t f =3D 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | - 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH | - 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID | - 0x1ULL << VHOST_BACKEND_F_SUSPEND; - int r; - - if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) { - return -EFAULT; - } - - features &=3D f; - - if (vhost_vdpa_first_dev(dev)) { - r =3D vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &features); - if (r) { - return -EFAULT; - } - } - - dev->backend_cap =3D features; - v->shared->backend_cap =3D features; - - return 0; -} - static int vhost_vdpa_get_device_id(struct vhost_dev *dev, uint32_t *device_id) { @@ -1512,7 +1501,6 @@ const VhostOps vdpa_ops =3D { .vhost_set_vring_kick =3D vhost_vdpa_set_vring_kick, .vhost_set_vring_call =3D vhost_vdpa_set_vring_call, .vhost_get_features =3D vhost_vdpa_get_features, - .vhost_set_backend_cap =3D vhost_vdpa_set_backend_cap, .vhost_set_owner =3D vhost_vdpa_set_owner, .vhost_set_vring_endian =3D NULL, .vhost_backend_memslots_limit =3D vhost_vdpa_memslots_limit, --=20 2.39.3