[libvirt-users] Cannot Write xvga=yes in xml file

Rogue S.T 15700157322 at 163.com
Fri Jan 5 07:58:37 UTC 2018

Yes, I can use guest with this way, But when i hot-add my graphics card , Guest will  reboot.
So i want to try it with <hostdev>. Somehow , If i use "hostdev" without xvga , my screen will be black.
If we have no  hostdev, do you have other methods can help me to use hot-plug my graphics card? 

At 2018-01-04 23:27:52, "Laine Stump" <laine at redhat.com> wrote:
>On 12/20/2017 09:40 PM, Rogue S.T wrote:
>> Hello,my system info:
>>     virsh verison
>>     Compiled against library: libvirt 3.9.0
>>     Using library: libvirt 3.9.0 
>>     Using API: QEMU 3.9.0
>>     Running hypervisor: QEMU 2.10.90
>> And i want to pass through my gpu to my window 7 guest with <hostdev>,
>> next line is comand i use:
>>      <hostdev mode='subsystem' type='pci' managed='yes' xvga='yes'>
>I'm not sure where you got the idea that libvirt's <hostdev> element had
>an attribute called "xvga", but it doesn't.
>If your GPU needs to have QEMU's xvga setting turned on, this posting
>from ALex's blog explains how to do it using libvirt's QEMU commandline
>I would recommend reading all the other postings in his blog as well, as
>they are very informative.
>>       <source>
>>         <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
>>       </source>
>>       <rom bar='on' file='/root/gpu.dump'/>
>>       <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
>> function='0x0'/>
>>     </hostdev>
>> But i get this error: 
>>         XML document failed to validate against schema: Unable to
>> validate doc against /ocl/share/libvirt/schemas/domain.rng
>>         Extra element devices in interleave
>>         Element domain failed to validate content
>> If i delete xvga='yes',it's ok, but i get a other question, my display
>> is not light.
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