docs/usb-storage.txt

   1
   2 qemu usb storage emulation
   3 --------------------------
   4
   5 QEMU has two emulations for usb storage devices.
   6
   7 Number one emulates the classic bulk-only transport protocol which is
   8 used by 99% of the usb sticks on the marked today and is called
   9 "usb-storage".  Usage (hooking up to xhci, other host controllers work
  10 too):
  11
  12   qemu ${other_vm_args}                                \
  13        -drive if=none,id=stick,file=/path/to/file.img  \
  14        -device nec-usb-xhci,id=xhci                    \
  15        -device usb-storage,bus=xhci.0,drive=stick
  16
  17
  18 Number two is the newer usb attached scsi transport.  This one doesn't
  19 automagically create a scsi disk, so you have to explicitly attach one
  20 manually.  Multiple logical units are supported.  Here is an example
  21 with tree logical units:
  22
  23   qemu ${other_vm_args}                                                \
  24        -drive if=none,id=uas-disk1,file=/path/to/file1.img             \
  25        -drive if=none,id=uas-disk2,file=/path/to/file2.img             \
  26        -drive if=none,id=uas-cdrom,media=cdrom,file=/path/to/image.iso \
  27        -device nec-usb-xhci,id=xhci                                    \
  28        -device usb-uas,id=uas,bus=xhci.0                               \
  29        -device scsi-hd,bus=uas.0,scsi-id=0,lun=0,drive=uas-disk1       \
  30        -device scsi-hd,bus=uas.0,scsi-id=0,lun=1,drive=uas-disk2       \
  31        -device scsi-cd,bus=uas.0,scsi-id=0,lun=5,drive=uas-cdrom
  32
  33
  34 enjoy,
  35   Gerd
  36
  37 --
  38 Gerd Hoffmann <kraxel@redhat.com>