[PULL,07/33] virtio-blk: don't lock AioContext in the submission code path

Commit Message

Kevin Wolf Dec. 21, 2023, 9:23 p.m. UTC

From: Stefan Hajnoczi <[e-mail]>

There is no need to acquire the AioContext lock around blk_aio_*() or
blk_get_geometry() anymore. I/O plugging (defer_call()) also does not
require the AioContext lock anymore.

Signed-off-by: Stefan Hajnoczi <[e-mail]>
Message-ID: <[e-mail]>
Reviewed-by: Kevin Wolf <[e-mail]>
Reviewed-by: Eric Blake <[e-mail]>
Reviewed-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: Kevin Wolf <[e-mail]>
---
 hw/block/virtio-blk.c | 5 -----
 1 file changed, 5 deletions(-)

Patch

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index f5315df042..e110f9718b 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1111,7 +1111,6 @@  void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
     MultiReqBuffer mrb = {};
     bool suppress_notifications = virtio_queue_get_notification(vq);
 
-    aio_context_acquire(blk_get_aio_context(s->blk));
     defer_call_begin();
 
     do {
@@ -1137,7 +1136,6 @@  void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
     }
 
     defer_call_end();
-    aio_context_release(blk_get_aio_context(s->blk));
 }
 
 static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
@@ -1168,7 +1166,6 @@  static void virtio_blk_dma_restart_bh(void *opaque)
         s->rq = NULL;
     }
 
-    aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
     while (req) {
         VirtIOBlockReq *next = req->next;
         if (virtio_blk_handle_request(req, &mrb)) {
@@ -1192,8 +1189,6 @@  static void virtio_blk_dma_restart_bh(void *opaque)
 
     /* Paired with inc in virtio_blk_dma_restart_cb() */
     blk_dec_in_flight(s->conf.conf.blk);
-
-    aio_context_release(blk_get_aio_context(s->conf.conf.blk));
 }
 
 static void virtio_blk_dma_restart_cb(void *opaque, bool running,