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virtio-scsi: protect events_dropped field

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The block layer can invoke the resize callback from any AioContext that
is processing requests. The virtqueue is already protected but the
events_dropped field also needs to be protected against races. Cover it
using the event virtqueue lock because it is closely associated with
accesses to the virtqueue.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20250311132616.1049687-7-stefanha@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2025-03-11 21:26:09 +08:00 • committed by Kevin Wolf
parent b348ca2e04
commit 7d8ab5b2f7
2 changed files with 22 additions and 10 deletions
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3
include/hw/virtio/virtio-scsi.h
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@ -82,10 +82,11 @@ struct VirtIOSCSI {
SCSIBus bus;
int resetting; /* written from main loop thread, read from any thread */
QemuMutex event_lock; /* protects event_vq and events_dropped */
bool events_dropped;
QemuMutex ctrl_lock; /* protects ctrl_vq */
QemuMutex event_lock; /* protects event_vq */
/*
* TMFs deferred to main loop BH. These fields are protected by