[libvirt] number of graphic device in vm xml is limited to only 1

[Daniel P. Berrangé]

On Thu, Oct 25, 2018 at 10:11:34AM +0000, Huangyong wrote:
> Hello,
> 
>          In qemu_command, vnc graphic device can’t be more than 1, as the following code show in qemuBuildCommandLineValidate():
>          If（sdl > 1 || vnc > 1 || spice > 1） {
>                    virReportError(….);
>                    return -1;
> }
> This check originally introduced by commit: 6fe9025eb.
> Qemu: Error on unsupported graphics config
> 
> qemu can support multi-vnc-configuration in qemu process, but libvirt limit vnc graphics in only 1.
> Is there any considerations in libvirt? can remove this restriction?

Yes, this restriction dates from the time QEMU was restricted to
1 display backend. We could certainly remove this restriction now.


Regards,
Daniel
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