From 6eaf0e612b415877d1c411b95bed2ecb53b546bb Mon Sep 17 00:00:00 2001 From: Li Feng Date: Thu, 16 May 2024 10:57:46 +0800 Subject: vhost-user: fix lost reconnect again When the vhost-user is reconnecting to the backend, and if the vhost-user fails at the get_features in vhost_dev_init(), then the reconnect will fail and it will not be retriggered forever. The reason is: When the vhost-user fail at get_features, the vhost_dev_cleanup will be called immediately. vhost_dev_cleanup calls 'memset(hdev, 0, sizeof(struct vhost_dev))'. The reconnect path is: vhost_user_blk_event vhost_user_async_close(.. vhost_user_blk_disconnect ..) qemu_chr_fe_set_handlers <----- clear the notifier callback schedule vhost_user_async_close_bh The vhost->vdev is null, so the vhost_user_blk_disconnect will not be called, then the event fd callback will not be reinstalled. We need to ensure that even if vhost_dev_init initialization fails, the event handler still needs to be reinstalled when s->connected is false. All vhost-user devices have this issue, including vhost-user-blk/scsi. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng Message-Id: <20240516025753.130171-3-fengli@smartx.com> Reviewed-by: Raphael Norwitz Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/scsi/vhost-user-scsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'hw/scsi/vhost-user-scsi.c') diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 421cd654f8..cc91ade525 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -182,7 +182,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); if (!s->connected) { - return; + goto done; } s->connected = false; @@ -190,6 +190,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) vhost_dev_cleanup(&vsc->dev); +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, vhost_user_scsi_event, NULL, dev, NULL, true); -- cgit 1.4.1