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Re: [libvirt-users] How to attach USB disk to specified USB controller in domian?



Hi all,

According to Eric's approach, I dumped its xml, but can not find its address as mentioned in former mail(Or,is it a bug?). Could you show me a detailed example for my doubt, thanks.

# virsh dumpxml rhel
<domain type='kvm' id='7'>
  <name>rhel</name>
  <uuid>205c40e0-e917-47fe-9c4a-1f35748ffd21</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
 ...
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/mnt/jiahu/images/rhel.img'>
        <seclabel model='selinux' labelskip='yes'/>
      </source>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>  
    </disk>
    <disk type='file' device='disk'>                                             
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/usb-img/usb-1.img'/>
      <target dev='sda' bus='usb'/>                                        <======== no USB bus related address or other address assigned to it.
      <alias name='usb-disk0'/>                      
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/usb-img/usb-2.img'/>
      <target dev='sdb' bus='usb'/>
      <alias name='usb-disk1'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/usb-img/usb-3.img'/>
      <target dev='sdc' bus='usb'/>
      <alias name='usb-disk2'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/usb-img/usb-4.img'/>
      <target dev='sdd' bus='usb'/>
      <alias name='usb-disk3'/>
    </disk>
...


BR,
Jianwei

----- Original Message -----
From: "Eric Blake" <eblake redhat com>
To: "Jianwei Hu" <jiahu redhat com>, libvirt-users redhat com
Sent: Tuesday, December 17, 2013 11:58:08 PM
Subject: Re: [libvirt-users] How to attach USB disk to specified USB controller in domian?

On 12/17/2013 02:47 AM, Jianwei Hu wrote:
> Hi guys,
> 
> I want to attach a few USB disks to specified USB controller in domain on libvirt layer, but I didn't find any method to deal with it. Anyone can help me on that?
> 
> I added some USB type disk to my domain, started it, I found all USB disk had been attached to same USB controller automatically, I want to assign some USB disks to another controller manually but I can't find the entry. qemu-kvm has provided command line to support it by using "bus" argument.(like: device_add usb-storage,id=my_usb_disk,drive=my_usb_disk,bus=usb.0 )
> 
> Action steps:
> 1. Add some USB disks to domain xml, 
> <disk type='file' device='disk'>
>       <driver name='qemu' type='raw'/>
>       <source file='/var/lib/libvirt/images/usb-img/usb-1.img'/>
>       <target dev='sda' bus='usb'/>
>       <alias name='usb-disk0'/>
>     </disk>

To force the guest to see the device under a particular UBS controller,
you need to include an <address> designation in your XML.

Check the 'virsh dumpxml' output to see what <address> got autogenerated
for your use case, then adjust the bus number in that address to instead
point to the controller number you want it associated with.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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