Merge remote-tracking branch 'bonzini/virtio-scsi' into staging
* bonzini/virtio-scsi:
scsi-block: always use scsi_generic_ops for cache != none
scsi: fix searching for an empty id
scsi: fix wrong return for target INQUIRY
virtio-scsi: add migration support
virtio-scsi: process control queue requests
virtio-scsi: add basic SCSI bus operation
virtio-scsi: Add basic request processing infrastructure
virtio-scsi: Add virtio-scsi stub device
scsi-disk: add migration support
scsi-generic: add migration support
scsi: add SCSIDevice vmstate definitions
scsi-disk: enable scatter/gather functionality
scsi: add scatter/gather functionality
scsi: pass residual amount to command_complete
ahci: use new DMA helpers
dma-helpers: add accounting wrappers
dma-helpers: add dma_buf_read and dma_buf_write
dma-helpers: make QEMUSGList target independent