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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2013-09-17 at 14:24 +0100, Wei Liu wrote:
> On Tue, Sep 17, 2013 at 12:54:57PM +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?
> > 
> 
> I think the document needs to be updated.
> 
> commit 2e814a017155b885e4d4b5a88dc05e7367a9722a
> Author: Fabio Fantoni <fabio.fantoni@xxxxxxxxxx>
> Date:   Fri Feb 15 13:32:27 2013 +0000
> 
>     tools/libxl: Improve videoram setting
>     
>     - If videoram setting is less than 8 mb shows error and exit.

I wonder why this is the case. Fabvio do you remmeberwhere this number
8M came from for Cirrus?




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