vitalif
/
mirror_qemu
mirror of https://github.com/proxmox/mirror_qemu
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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: fd66dbd424 ("blkio: add libblkio block driver")
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20230725103744.77343-1-sgarzare@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Stefano Garzarella 2023-07-25 12:37:44 +02:00 committed by Stefan Hajnoczi
parent 66547f416a
commit 9359c45988
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
block/blkio.c
View File

@ -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;