From 22d2464f7ee6242114733e62541eed14cde15977 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Tue, 3 Oct 2023 21:45:30 -0400 Subject: vhost-user: do not send RESET_OWNER on device reset The VHOST_USER_RESET_OWNER message is deprecated in the spec: This is no longer used. Used to be sent to request disabling all rings, but some back-ends interpreted it to also discard connection state (this interpretation would lead to bugs). It is recommended that back-ends either ignore this message, or use it to disable all rings. The only caller of vhost_user_reset_device() is vhost_user_scsi_reset(). It checks that F_RESET_DEVICE was negotiated before calling it: static void vhost_user_scsi_reset(VirtIODevice *vdev) { VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); struct vhost_dev *dev = &vsc->dev; /* * Historically, reset was not implemented so only reset devices * that are expecting it. */ if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { return; } if (dev->vhost_ops->vhost_reset_device) { dev->vhost_ops->vhost_reset_device(dev); } } Therefore VHOST_USER_RESET_OWNER is actually never sent by vhost_user_reset_device(). Remove the dead code. This effectively moves the vhost-user protocol specific code from vhost-user-scsi.c into vhost-user.c where it belongs. Signed-off-by: Stefan Hajnoczi Message-Id: <20231004014532.1228637-2-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Raphael Norwitz --- hw/virtio/vhost-user.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'hw/virtio') diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 427ee0ebfb..f9414f03de 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1482,12 +1482,17 @@ static int vhost_user_reset_device(struct vhost_dev *dev) { VhostUserMsg msg = { .hdr.flags = VHOST_USER_VERSION, + .hdr.request = VHOST_USER_RESET_DEVICE, }; - msg.hdr.request = virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_RESET_DEVICE) - ? VHOST_USER_RESET_DEVICE - : VHOST_USER_RESET_OWNER; + /* + * Historically, reset was not implemented so only reset devices + * that are expecting it. + */ + if (!virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { + return -ENOSYS; + } return vhost_user_write(dev, &msg, NULL, 0); } -- cgit v1.2.3