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virtio-scsi: handle ctrl virtqueue in main loop

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Previously the ctrl virtqueue was handled in the AioContext where SCSI
requests are processed. When IOThread Virtqueue Mapping was added things
become more complicated because SCSI requests could run in other
AioContexts.

Simplify by handling the ctrl virtqueue in the main loop where reset
operations can be performed. Note that BHs are still used canceling SCSI
requests in their AioContexts but at least the mean loop activity
doesn't need BHs anymore.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20250311132616.1049687-13-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 21:26:15 +08:00 • committed by Kevin Wolf
parent 2e8e18c2e4
commit bcede51d2d
3 changed files with 33 additions and 125 deletions
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8
include/hw/virtio/virtio-scsi.h
View file

@ -90,14 +90,6 @@ struct VirtIOSCSI {
QemuMutex ctrl_lock; /* protects ctrl_vq */
/*
* TMFs deferred to main loop BH. These fields are protected by
* tmf_bh_lock.
*/
QemuMutex tmf_bh_lock;
QEMUBH *tmf_bh;
QTAILQ_HEAD(, VirtIOSCSIReq) tmf_bh_list;
/* Fields for dataplane below */
AioContext **vq_aio_context; /* per-virtqueue AioContext pointer */