scsi-disk: move all non-DMA commands to scsi_disk_emulate_command
We want to use separate SCSIReqOps for emulated commands needing an
allocated buffer vs. those that are zerocopy when the HBA supports
S/G lists. Ensure that all of the former are in scsi_disk_emulate_command.
Commands that do not have any parameters are more similar to emulated
commands, so also move them, even if they do I/O.
Finally, MODE SELECT and MODE SELECT(10) are broken because we do not
yet support passing parameter data _to_ emulated commands, so disable
them.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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