8:16 p.m.
Is there anyone who know detailed address formats for particular USB controller in
attached USB disk of Domain XML?
BR,
Jianwei
----- Original Message -----
From: "Jianwei Hu" <jiahu(a)redhat.com>
To: "Eric Blake" <eblake(a)redhat.com>, libvirt-users(a)redhat.com
Sent: Wednesday, December 18, 2013 11:21:36 AM
Subject: 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(a)redhat.com>
To: "Jianwei Hu" <jiahu(a)redhat.com>, libvirt-users(a)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