Re: FreeBSD Dom0 IOMMU issues (resent)

["Chen, Tiejun" <tiejun.chen@intel.com>]

On 2015/5/8 13:21, Michael Dexter wrote:
> On 5/7/15 7:59 PM, Chen, Tiejun wrote:
>> Are you running IGD passthrough with guest OS?
>
> Only as far as the PVH Xen kernel is passing through all hardware to
> Dom0. Roger can elaborate as needed.
>
>> What is your CPU? BDW? HSW? And what is your FreeBSD Linux version on
>> Dom0 side? I just think you can directly try the latest upstream Linux
>> as Dom0, because I see so many messages indicating GPU hang.
>
> My output has dmesg information for this purpose. Most output is from:
>
> CPU: Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz (2790.93-MHz K8-class CPU)
> Lenovo ThinkPad T420
>
> The second system is:
>
> CPU: Intel(R) Core(TM) i5-2400S CPU @ 2.50GHz (2500.02-MHz K8-class CPU)
> Intel DQ67EP Mini-ITX board
>
> Both systems are recent FreeBSD 11 snapshots, the Dom0:

Please dump something by perform `cat /proc/cpuinfo`.

>
> FreeBSD 11.0-CURRENT #0 r282110: Mon Apr 27 20:49:15 UTC 2015
>
> The DomU:
>
> FreeBSD 11.0-CURRENT #0 r280862: Mon Mar 30 20:15:11 UTC 2015
>
> I have not tried GNU/Linux but could if you like. Is there a preferred
> distribution for use with Xen?
>
>> So maybe you need to upgrade DRM/I915 driver firstly.
>
> Any and all help from Intel at keeping the FreeBSD graphics drivers up
> to date is appreciated. FreeBSD 11 HEAD represents the latest drivers. I
> believe I have tried this under NVidia with similar results. I can run a

Do you mean you can see "... GPU hang" as well?

I just want to narrow down our scope because in any case GPU shouldn't 
constantly hang.

Thanks
Tiejun

> test if you like.
>
> All the best,
>
> Michael Dexter
>
>
>