Re: [Xen-devel] Disabling cirrus-vga

["billy lau" <billylau@xxxxxxxxx>]

On Fri, Dec 12, 2008 at 5:33 AM, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

billy lau wrote:

>
>
> On Thu, Dec 11, 2008 at 8:09 PM, Jun Koi <junkoi2004@xxxxxxxxx

> <mailto:junkoi2004@xxxxxxxxx>> wrote:
>
>     On Fri, Dec 12, 2008 at 9:49 AM, billy lau <billylau@xxxxxxxxx

>     <mailto:billylau@xxxxxxxxx>> wrote:
>     > Hi xen developers,
>     >
>     > Does any of you know how to disable the cirrus-vga emulation for
>     hvm in xen?
>     > I have been trying to disable that from the source codes, but even
>     with
>     > that, I still see a VGA controller when I boot up my guest domain. In
>     > particular, I would like to do this because I am passing through a
>     graphics
>     > card to my guest domain using direct pass through.
>
>     Sorry that I dont understand your motivation. If your card is
>     passthrough, the guest would load the appropriate driver for that. So
>     why do you care about the cirrus-vga driver?
>
>
> This is because, even after installing the appropriate driver, there is
> a conflict of device. Even after I disabled the cirrus driver, the
> actual driver was reported to be "unable to access resources". Does that
> sound reasonable then?

I think at the moment there is no way to do it from the command line.
You have to comment out any call to pci_cirrus_vga_init,
isa_cirrus_vga_init, pci_vmsvga_init, pci_vga_init and isa_vga_init in
hw/pc.c (lines 939-962).

You may also want to disable loadind the vgabios, also in hw/pc.c
(load_image_targphys).

Alright, I will give that a try, and get back to you guys again. Thanks for the input.

- billy

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