Stefan Hajnoczi 766aa2de0f virtio-scsi: implement BlockDevOps->drained_begin() ... The virtio-scsi Host Bus Adapter provides access to devices on a SCSI bus. Those SCSI devices typically have a BlockBackend. When the BlockBackend enters a drained section, the SCSI device must temporarily stop submitting new I/O requests. Implement this behavior by temporarily stopping virtio-scsi virtqueue processing when one of the SCSI devices enters a drained section. The new scsi_device_drained_begin() API allows scsi-disk to message the virtio-scsi HBA. scsi_device_drained_begin() uses a drain counter so that multiple SCSI devices can have overlapping drained sections. The HBA only sees one pair of .drained_begin/end() calls. After this commit, virtio-scsi no longer depends on hw/virtio's ioeventfd aio_set_event_notifier(is_external=true). This commit is a step towards removing the aio_disable_external() API. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20230516190238.8401-19-stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>		2023-05-30 17:32:02 +02:00
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emulation.h	Normalize header guard symbol definition.	2019-05-13 08:58:55 +02:00
esp.h	esp: convert ESPState pdma_cb from a function pointer to an integer	2022-03-09 09:29:10 +00:00
scsi.h	virtio-scsi: implement BlockDevOps->drained_begin()	2023-05-30 17:32:02 +02:00