From 9359c459889fce1804c4e1b2a2ff8f182b4a9ae8 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Tue, 25 Jul 2023 12:37:44 +0200 Subject: block/blkio: enable the completion eventfd Until libblkio 1.3.0, virtio-blk drivers had completion eventfd notifications enabled from the start, but from the next releases this is no longer the case, so we have to explicitly enable them. In fact, the libblkio documentation says they could be disabled, so we should always enable them at the start if we want to be sure to get completion eventfd notifications: By default, the driver might not generate completion events for requests so it is necessary to explicitly enable the completion file descriptor before use: void blkioq_set_completion_fd_enabled(struct blkioq *q, bool enable); I discovered this while trying a development version of libblkio: the guest kernel hangs during boot, while probing the device. Fixes: fd66dbd424f5 ("blkio: add libblkio block driver") Signed-off-by: Stefano Garzarella Message-id: 20230725103744.77343-1-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- block/blkio.c | 1 + 1 file changed, 1 insertion(+) (limited to 'block') diff --git a/block/blkio.c b/block/blkio.c index 1798648134..bc1fac48b7 100644 --- a/block/blkio.c +++ b/block/blkio.c @@ -845,6 +845,7 @@ static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, QLIST_INIT(&s->bounce_bufs); s->blkioq = blkio_get_queue(s->blkio, 0); s->completion_fd = blkioq_get_completion_fd(s->blkioq); + blkioq_set_completion_fd_enabled(s->blkioq, true); blkio_attach_aio_context(bs, bdrv_get_aio_context(bs)); return 0; -- cgit v1.2.3