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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::52f (failed) 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=2a00:1450:4864:20::52f; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x52f.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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: , Cc: Fam Zheng , slp@redhat.com, mathieu.poirier@linaro.org, mst@redhat.com, viresh.kumar@linaro.org, Raphael Norwitz , Maxime Coquelin , stefanha@redhat.com, Paolo Bonzini , marcandre.lureau@redhat.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1647878027313100001 Previously we would silently suppress VHOST_USER_PROTOCOL_F_CONFIG during the protocol negotiation if the QEMU stub hadn't implemented the vhost_dev_config_notifier. However this isn't the only way we can handle config messages, the existing vdc->get/set_config can do this as well. Lightly re-factor the code to check for both potential methods and instead of silently squashing the feature error out. It is unlikely that a vhost-user backend expecting to handle CONFIG messages will behave correctly if they never get sent. Fixes: 1c3e5a2617 ("vhost-user: back SET/GET_CONFIG requests with a protoco= l feature") Cc: Maxime Coquelin Cc: Michael S. Tsirkin Cc: Stefan Hajnoczi Signed-off-by: Alex Benn=C3=A9e --- - we can't check for get_config/set_config as the stack squashed vdev - use vhost-user-state to transmit this --- include/hw/virtio/vhost-user.h | 1 + hw/scsi/vhost-user-scsi.c | 1 + hw/virtio/vhost-user.c | 46 ++++++++++++++++++++++++---------- 3 files changed, 35 insertions(+), 13 deletions(-) diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index e44a41bb70..6e0e8a71a3 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -22,6 +22,7 @@ typedef struct VhostUserState { CharBackend *chr; VhostUserHostNotifier notifier[VIRTIO_QUEUE_MAX]; int memory_slots; + bool supports_config; } VhostUserState; =20 bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp); diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 1b2f7eed98..9be21d07ee 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -121,6 +121,7 @@ static void vhost_user_scsi_realize(DeviceState *dev, E= rror **errp) vsc->dev.backend_features =3D 0; vqs =3D vsc->dev.vqs; =20 + s->vhost_user.supports_config =3D true; ret =3D vhost_dev_init(&vsc->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0, errp); if (ret < 0) { diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index b27b8c56e2..6ce082861b 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1949,14 +1949,15 @@ static int vhost_user_postcopy_notifier(NotifierWit= hReturn *notifier, static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque, Error **errp) { - uint64_t features, protocol_features, ram_slots; + uint64_t features, ram_slots; struct vhost_user *u; + VhostUserState *vus =3D (VhostUserState *) opaque; int err; =20 assert(dev->vhost_ops->backend_type =3D=3D VHOST_BACKEND_TYPE_USER); =20 u =3D g_new0(struct vhost_user, 1); - u->user =3D opaque; + u->user =3D vus; u->dev =3D dev; dev->opaque =3D u; =20 @@ -1967,6 +1968,10 @@ static int vhost_user_backend_init(struct vhost_dev = *dev, void *opaque, } =20 if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) { + bool supports_f_config =3D vus->supports_config || + (dev->config_ops && dev->config_ops->vhost_dev_config_notifier= ); + uint64_t protocol_features; + dev->backend_features |=3D 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; =20 err =3D vhost_user_get_u64(dev, VHOST_USER_GET_PROTOCOL_FEATURES, @@ -1976,19 +1981,34 @@ static int vhost_user_backend_init(struct vhost_dev= *dev, void *opaque, return -EPROTO; } =20 - dev->protocol_features =3D - protocol_features & VHOST_USER_PROTOCOL_FEATURE_MASK; - - if (!dev->config_ops || !dev->config_ops->vhost_dev_config_notifie= r) { - /* Don't acknowledge CONFIG feature if device doesn't support = it */ - dev->protocol_features &=3D ~(1ULL << VHOST_USER_PROTOCOL_F_CO= NFIG); - } else if (!(protocol_features & - (1ULL << VHOST_USER_PROTOCOL_F_CONFIG))) { - error_setg(errp, "Device expects VHOST_USER_PROTOCOL_F_CONFIG " - "but backend does not support it."); - return -EINVAL; + /* + * We will use all the protocol features we support - although + * we suppress F_CONFIG if we know QEMUs internal code can not sup= port + * it. + */ + protocol_features &=3D VHOST_USER_PROTOCOL_FEATURE_MASK; + + if (supports_f_config) { + if (!virtio_has_feature(protocol_features, + VHOST_USER_PROTOCOL_F_CONFIG)) { + error_setg(errp, "vhost-user device %s expecting " + "VHOST_USER_PROTOCOL_F_CONFIG but the vhost-use= r backend does " + "not support it.", dev->vdev->name); + return -EPROTO; + } + } else { + if (virtio_has_feature(protocol_features, + VHOST_USER_PROTOCOL_F_CONFIG)) { + warn_reportf_err(*errp, "vhost-user backend supports " + "VHOST_USER_PROTOCOL_F_CONFIG for " + "device %s but QEMU does not.", + dev->vdev->name); + protocol_features &=3D ~(1ULL << VHOST_USER_PROTOCOL_F_CON= FIG); + } } =20 + /* final set of protocol features */ + dev->protocol_features =3D protocol_features; err =3D vhost_user_set_protocol_features(dev, dev->protocol_featur= es); if (err < 0) { error_setg_errno(errp, EPROTO, "vhost_backend_init failed"); --=20 2.30.2