[libvirt] [PATCH 0/5]qemu: add usb-bot scsi controller support

Guannan Ren gren at redhat.com
Mon Sep 2 09:38:39 UTC 2013

qemu patch:http://lists.gnu.org/archive/html/qemu-devel/2013-01/msg02200.html

These patch aims to add usb-bot SCSI controller support for libvirt.
As usb-storage libvirt already supported, usb-bot only supports one
SCSI target with SCSI ID 0.
The difference is that usb-storage creates SCSI HBA and additionaly
either a scsi-disk or a scsi-generic device, usb-bot only creates the
SCSI HBA. we can attach a SCSI device to it with another -device.

usb-bot supports a single target and a number of luns. The limit is
15 luns (0~15 LUN ID) and they must be contiguous(using lun 0 and 2
without 1 doesn't work).

Athought usb-bot is a SCSI controller it needs to be attached to a
exsiting USB controller for work. So it has to use address of usb type.

Libvirt XML:

   <disk type='file' device='disk'>
     <driver name='qemu' type='raw'/>
     <source file='/var/lib/libvirt/images/disk.qcow2'/>
     <target dev='sdc' bus='scsi'/>
     <address type='drive' controller='0' bus='0' target='0' unit='0'/>
   <controller type='usb' index='0'/>
   <controller type='scsi' index='0' model='usb-bot'>
     <address type='usb' bus='0' port='1'/>

The QEMU commandline:

qemu ${other_vm_args}                          \
     -device piix3-usb-uhci,id=usb             \
     -device usb-bot,id=scsi0,bus=usb.0,port=1 \
     -drive file=/var/lib/libvirt/images/disk.qcow2,if=none,id=drive-scsi0-0-0-0,format=raw \
     -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0

As the usb-storage creates scsi disk automatically which doesn't let
you set scsi-disk properties such as vendor, product, wwn, channel,
scsi-id and lun. So QEMU guys prefer usb-bot to usb-storage.
So this is the first part of the whole work. Next step will replace
usb-storage with usb-bot when disk in xml uses usb bus like
<disk ...>
  <target bus='usb'>

Guannan Ren(5)
  qemu: add usb-bot qemu cap flag
  qemu: add usb-bot model scsi controller support
  qemu: add usb-bot support from disks points of view
  qemu: refactor out function to build scsi device qemu commandline
  tests: add xml2argv test for usb-bot scsi controller

 docs/formatdomain.html.in                                 |   4 +--
 docs/schemas/domaincommon.rng                             |   1 +
 src/conf/domain_conf.c                                    | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 src/conf/domain_conf.h                                    |   5 +++
 src/libvirt_private.syms                                  |   1 +
 src/qemu/qemu_capabilities.c                              |   3 ++
 src/qemu/qemu_capabilities.h                              |   1 +
 src/qemu/qemu_command.c                                   | 124 ++++++++++++++++++++++++++++++++++++++++++-------------------------------
 src/vmx/vmx.c                                             |   3 +-
 tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-usbbot.args |  10 ++++++
 tests/qemuxml2argvdata/qemuxml2argv-disk-scsi-usbbot.xml  |  33 ++++++++++++++++++++
 tests/qemuxml2argvtest.c                                  |   3 ++
 12 files changed, 242 insertions(+), 57 deletions(-)

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