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block: remove AioContext locking

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This is the big patch that removes
aio_context_acquire()/aio_context_release() from the block layer and
affected block layer users.

There isn't a clean way to split this patch and the reviewers are likely
the same group of people, so I decided to do it in one patch.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Message-ID: <20231205182011.1976568-7-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-12-05 13:20:03 -05:00 • committed by Kevin Wolf
parent 6bc30f1949
commit b49f4755c7
41 changed files with 104 additions and 1169 deletions
Download patch file Download diff file Expand all files Collapse all files

10
hw/block/dataplane/virtio-blk.c
View file

@ -124,7 +124,6 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
VirtIOBlockDataPlane *s = vblk->dataplane;
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vblk)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
AioContext *old_context;
unsigned i;
unsigned nvqs = s->conf->num_queues;
Error *local_err = NULL;
@ -178,10 +177,7 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
trace_virtio_blk_data_plane_start(s);
old_context = blk_get_aio_context(s->conf->conf.blk);
aio_context_acquire(old_context);
r = blk_set_aio_context(s->conf->conf.blk, s->ctx, &local_err);
aio_context_release(old_context);
if (r < 0) {
error_report_err(local_err);
goto fail_aio_context;
@ -208,13 +204,11 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
/* Get this show started by hooking up our callbacks */
if (!blk_in_drain(s->conf->conf.blk)) {
aio_context_acquire(s->ctx);
for (i = 0; i < nvqs; i++) {
VirtQueue *vq = virtio_get_queue(s->vdev, i);
virtio_queue_aio_attach_host_notifier(vq, s->ctx);
}
aio_context_release(s->ctx);
}
return 0;
@ -314,8 +308,6 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
*/
vblk->dataplane_started = false;
aio_context_acquire(s->ctx);
/* Wait for virtio_blk_dma_restart_bh() and in flight I/O to complete */
blk_drain(s->conf->conf.blk);
@ -325,8 +317,6 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
*/
blk_set_aio_context(s->conf->conf.blk, qemu_get_aio_context(), NULL);
aio_context_release(s->ctx);
/* Clean up guest notifier (irq) */
k->set_guest_notifiers(qbus->parent, nvqs, false);

17
hw/block/dataplane/xen-block.c
View file

@ -260,8 +260,6 @@ static void xen_block_complete_aio(void *opaque, int ret)
XenBlockRequest *request = opaque;
XenBlockDataPlane *dataplane = request->dataplane;
aio_context_acquire(dataplane->ctx);
if (ret != 0) {
error_report("%s I/O error",
request->req.operation == BLKIF_OP_READ ?
@ -273,10 +271,10 @@ static void xen_block_complete_aio(void *opaque, int ret)
if (request->presync) {
request->presync = 0;
xen_block_do_aio(request);
goto done;
return;
}
if (request->aio_inflight > 0) {
goto done;
return;
}
switch (request->req.operation) {
@ -318,9 +316,6 @@ static void xen_block_complete_aio(void *opaque, int ret)
if (dataplane->more_work) {
qemu_bh_schedule(dataplane->bh);
}
done:
aio_context_release(dataplane->ctx);
}
static bool xen_block_split_discard(XenBlockRequest *request,
@ -601,9 +596,7 @@ static void xen_block_dataplane_bh(void *opaque)
{
XenBlockDataPlane *dataplane = opaque;
aio_context_acquire(dataplane->ctx);
xen_block_handle_requests(dataplane);
aio_context_release(dataplane->ctx);
}
static bool xen_block_dataplane_event(void *opaque)
@ -703,10 +696,8 @@ void xen_block_dataplane_stop(XenBlockDataPlane *dataplane)
xen_block_dataplane_detach(dataplane);
}
aio_context_acquire(dataplane->ctx);
/* Xen doesn't have multiple users for nodes, so this can't fail */
blk_set_aio_context(dataplane->blk, qemu_get_aio_context(), &error_abort);
aio_context_release(dataplane->ctx);
/*
* Now that the context has been moved onto the main thread, cancel
@ -752,7 +743,6 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
{
ERRP_GUARD();
XenDevice *xendev = dataplane->xendev;
AioContext *old_context;
unsigned int ring_size;
unsigned int i;
@ -836,11 +826,8 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
goto stop;
}
old_context = blk_get_aio_context(dataplane->blk);
aio_context_acquire(old_context);
/* If other users keep the BlockBackend in the iothread, that's ok */
blk_set_aio_context(dataplane->blk, dataplane->ctx, NULL);
aio_context_release(old_context);
if (!blk_in_drain(dataplane->blk)) {
xen_block_dataplane_attach(dataplane);