Re: [libvirt-users] Cannot Write xvga=yes in xml file
(Please don't top-post your replies on this list. Post them inline with
the text you are responding to)
On 01/05/2018 02:58 AM, Rogue S.T wrote:
Yes, I can use guest with this way, But when i hot-add my graphics
card
, Guest will reboot.
It's very .... "ambitious" to expect hot-plug of a vfio-assigned
graphics card to work properly. I doubt that has been tested much, if at
all - vfio and QEMU might handle it properly, but it's very likely that
the guest OS would not.
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?
I didn't say there is no <hostdev>, I said that the <hostdev> element
has no attribute called "xvga".
QEMU itself *does* have a commandline option called "xvga" though, and
that can be set using libvirt's "QEMU commandline passthrough",
following the directions on the page that I linked in my original
response. Of course, QEMU commandline passthrough can't be used when
hot-plugging devices - maybe that's what you're trying to point out; if
that's really your problem, then there is no solution (other than to not
hot-plug the GPU).
At 2018-01-04 23:27:52, "Laine Stump" <laine(a)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
>passthrough:
>
>http://vfio.blogspot.com/2016/09/passing-qemu-command-line-options.html
>
>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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