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H A D | iscsi.c | 98392453 Fri May 25 11:59:01 GMT 2012 Ronnie Sahlberg <ronniesahlberg@gmail.com> ISCSI: Add SCSI passthrough via scsi-generic to libiscsi
Update iscsi to allow passthrough of SG_IO scsi commands when the iscsi device is forced to be scsi-generic.
Implement both bdrv_ioctl() and bdrv_aio_ioctl() in the iscsi backend, emulate the SG_IO ioctl and pass the SCSI commands across to the iscsi target.
This allows end-to-end passthrough of SCSI all the way from the guest, to qemu, via scsi-generic, then libiscsi all the way to the iscsi target.
To activate this you need to specify that the iscsi lun should be treated as a scsi-generic device.
Example: -device lsi -device scsi-generic,drive=MyISCSI \ -drive file=iscsi://10.1.1.125/iqn.ronnie.test/1,if=none,id=MyISCSI
Note, you can currently not boot a qemu guest from a scsi device.
Note, This only works when the host is linux, since the emulation relies on definitions of SG_IO from the scsi-generic implementation in the linux kernel. It should be fairly easy to re-implement some structures similar enough for non-linux hosts to do the same style of passthrough via a fake scsi generic layer and libiscsi if need be.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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