Re: [Xen-devel] libxl videoram for cirrus graphics

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Sep 17, 2013 at 03:03:20PM +0100, Frediano Ziglio wrote:
> On Tue, 2013-09-17 at 12:54 +0000, Rob Hoes wrote:
> > Hi,
> > 
> > The videoram setting in xl config files is documented as follows:
> > 
> > "
> > videoram=MBYTES
> > 
> >     Sets the amount of RAM which the emulated video card will contain, 
> > which in turn limits the resolutions and bit depths which will be 
> > available. The default amount of video ram for stdvga is 8MB which is 
> > sufficient for e.g. 1600x1200 at 32bpp and videoram option is currently 
> > working only when using the qemu-xen-traditional device-model.
> > 
> >     When using the emulated Cirrus graphics card (vga="cirrus") the amount 
> > of video ram is fixed at 4MB which is sufficient for 1024x768 at 32 bpp and 
> > videoram option is currently working only when using the upstream qemu-xen 
> > device-model.
> > "
> > 
> > XenServer also uses a default of 4MB video ram for cirrus graphics.
> > 
> > However, when I use xl to create a VM with cirrus graphics, I get 8MB of 
> > video RAM by default. Moreover, setting it to videoram=4 in the config file 
> > leads to complaints from libxl:
> > 
> >     libxl_create.c:228:libxl__domain_build_info_setdefault: videoram must 
> > be at least 8 mb
> > 
> > Is there a bug in the logic in libxl_create.c?
> > 
> > Cheers,
> > Rob
> > 
> 
> cirrus card support maximum of 4mb (which is also the default) so there
> is IMHO no point in reporting an error, just a warning would be enough
> 

Uhm, I think Rob says above he's able to use 8MB with Cirrus.
Maybe there's a difference between qemu-traditional and qemu-upstream? 

Maybe the old qemu-traditional only supports fixed 4MB with Cirrus? 
And new qemu-upstream allows more videomem, with the possibility of configuring 
the amount of videomem? 

Just guessing here..

> Frediano
> 

-- Pasi


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