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Re: [libvirt] [PATCH v2 4/4] qemu-command: introduce new vgamem attribute for video devices



On Fr, 2014-11-14 at 16:13 +0100, Pavel Hrdina wrote:
> On 11/14/2014 04:06 PM, Gerd Hoffmann wrote:
> > On Fr, 2014-11-14 at 14:54 +0100, Pavel Hrdina wrote:
> >> +        if (video->vram % 1024) {
> >> +            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> >> +                           "%s", _("value for 'vram' must be multiple
> >> of 1024"));
> >> +            goto error;
> >> +        }
> >
> > pci bar size must be a power of two.  Especially the 9216 default value
> > libvirt fills in there is *not* valid.  This probably needs some extra
> > care to handle so existing guest xml files don't blow up things.
> >
> > cheers,
> >    Gerd
> 
> Default value for QXL is 64MB in libvirt, the 9MB is for other video 
> devices. But we can probably add a special check for QXL device to
> ensure that ram or vram size is power of 2.

For stdvga and vmware vga it must be a power of two too.

cheers,
  Gerd



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