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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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.
    - Added videoram setting for qemu upstream with cirrus (added in qemu 1.3).
    - Updated xl.cfg man.
    - Default and minimal videoram changed to 16 mb if stdvga is set and 
upstream
      qemu is being used. This is required by qemu 1.4 to avoid a xen memory 
error
      (qemu 1.3 doesn't complain about it, probably buggy).
    
    Signed-off-by: Fabio Fantoni <fabio.fantoni@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Wei.

> Cheers,
> Rob
> 
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