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virtio-scsi: Forbid devices with different iothreads sharing a blockdev

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This patch forbids attaching a disk to a SCSI device if its using a
different AioContext. Test case included.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-01-22 17:53:23 +02:00 • committed by Kevin Wolf
parent 3ff35ba391
commit eb97813ff5
3 changed files with 49 additions and 0 deletions
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7
hw/scsi/virtio-scsi.c
View file

@ -791,9 +791,16 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
SCSIDevice *sd = SCSI_DEVICE(dev);
if (s->ctx && !s->dataplane_fenced) {
AioContext *ctx;
if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
return;
}
ctx = blk_get_aio_context(sd->conf.blk);
if (ctx != s->ctx && ctx != qemu_get_aio_context()) {
error_setg(errp, "Cannot attach a blockdev that is using "
"a different iothread");
return;
}
virtio_scsi_acquire(s);
blk_set_aio_context(sd->conf.blk, s->ctx);
virtio_scsi_release(s);