Re: Status IGD pass-through with QEMU/KVM

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2015-01-28 16:36, Alex Williamson wrote:
> On Wed, 2015-01-28 at 16:02 +0100, Jan Kiszka wrote:
>> Hi Alex,
>>
>> before getting dirty fingers in vain: what is the current status of
>> handing an IGD GPU to a KVM guest, specifically Windows? I found some
>> related QEMU patches from last year on the list, but it seems they
>> didn't progress. Are there open issues without known solutions or is it
>> "just" about putting pieces together - given that there related patches
>> for Xen floating around?
> 
> Hi Jan,
> 
> The patches submitted last year by Andrew Barnes are functional (AFAIK),
> but mostly proof-of-concept quality.  They make use of /dev/mem in place
> of designing VFIO interfaces, they hack into various chipset code, etc.
> Based on the attempts to port the Xen IGD code into QEMU, I think Intel
> was working on reducing the machine level impact of IGD assignment with
> a "universal" driver, but I haven't seen any status updates on that for
> some time.  If Intel is successful in creating such a driver, then IGD
> assignment may be no more complicated that discrete assignment (but
> might only support very new HW).  To support current hardware and
> drivers, we need to expose not only the IGD device, but manipulate
> chispet device IDs and punch through registers and opregions on other
> devices.  Andrew's patches do this, but need help to architect
> interfaces and break down the code into upstream-able chunks.  Thanks,

OK, thanks. Need to study more details then.

Jan

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