Re: [Xen-devel] [Xen-users] [REQUEST] Request for Xen Users to Attempt Jean David Techer's Xen 4.2-unstable VGA Passthrough Documentation

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Mar 31, 2012 at 01:06:37PM +0200, Kristijan Le??nik wrote:
>    Hi,
>    i was looking hard to get this thing working, and i somehow manage to get
>    two ATI graphic card working under Windows 7 and Debian 6 DomU,
>    what i learn from all this trying, that the most important thing is the
>    motherboard!
>    i had i7 860 with VT-D, but it was hard to find working VT-D motherboard,
>    i try gigabyte P55-USB3 with beta bios from gigabyte and i got working 3D
>    drivers for a few minutes and then the DomU would crash,
>    then i wanted to try asus, but they said that P55 chipset doesnt support
>    VT-D functions, then i look what David uses and get a MSI motherboard and
>    its default bios has got VT-D to enable/disable
>    currenty i have:
>    i7 860
>    MSI P55 GD85
>    ATI H6670 - working 3D
>    ATI H5830 - working 3D
>    Debian 6.0, custom kernel 3.1
>    Xen 4.2 unstable ( from repo 2. march? )
>    Windows 7 64bit - virtual
>    no extra patches
>    but how i get it to work is strange, if i enable #gfx_passthru=1 then
>    virtual machine wont start
>

gfx_passthru=1 makes the passthru gfx card primary in the VM, 
so you need the additional ATI gfx passthru patch so that the VBIOS passthru 
works. 

without gfx_passthru=1 the virtual emulated gfx is primary.

-- Pasi


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