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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2023-12-04 11:42:56 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2023-12-21 22:49:27 +0100 |
| commit | eaad0fe26050c227dc5dad63205835bac4912a51 (patch) | |
| tree | 6c954c0f7d9cebf9ee228a68b281483a9d4e9fe2 /hw/scsi/virtio-scsi-dataplane.c | |
| parent | bb6e2511eb48539b7dcbcb5f47772e156b9c45d1 (diff) | |
| download | qemu-eaad0fe26050c227dc5dad63205835bac4912a51.zip qemu-eaad0fe26050c227dc5dad63205835bac4912a51.tar.gz qemu-eaad0fe26050c227dc5dad63205835bac4912a51.tar.bz2 | |
scsi: only access SCSIDevice->requests from one thread
Stop depending on the AioContext lock and instead access
SCSIDevice->requests from only one thread at a time:
- When the VM is running only the BlockBackend's AioContext may access
the requests list.
- When the VM is stopped only the main loop may access the requests
list.
These constraints protect the requests list without the need for locking
in the I/O code path.
Note that multiple IOThreads are not supported yet because the code
assumes all SCSIRequests are executed from a single AioContext. Leave
that as future work.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-ID: <20231204164259.1515217-2-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'hw/scsi/virtio-scsi-dataplane.c')
0 files changed, 0 insertions, 0 deletions