Re: [Xen-devel] [PATCH] hvmloader / qemu-xen: Getting rid of resource conflict for OpRegion.

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

On Sat, Dec 22, 2012 at 1:26 AM, Ross Philipson
<Ross.Philipson@xxxxxxxxxx> wrote:
>> > Yes, my win 7 guest is totally broken with IGD passthrough (much worse
>> > than linux status).
>> > Before I bought my current build, sources like wikis seems to mention
>> > that IGD is the first card that works.
>> > And now, it seems the AMD cards are the best choice for pass-through.
>> > Sad news for me.
>>
>> Let me just clarify that up to now we have been successful in passing in
>> igfx cards without having to surface any of these ACPI bits. I was just
>> mentioning that this is an inconsistency and might be worth
>> investigating at some point.

So you are able to get a working win7 domU with IGD passthrough? That's amazing.
Currently I just have a working linux domU with IGD passthrough. (just
solve the last known functionality issue)
But the win7 domU keeps BSOD during early boot stage with IGD passed through.
The BSOD varies time to time, with or without intel gfx driver installed.
But all the BSODs are more or less related to memory corruption.
I begun to suspect this may have something to do with the bios / firmware.
(Your working system are based on intel board, right? Mine are Asrock H77m-itx)
But I don't have enough knowledge to triage the issue (all I can do so
far is to analyze core dump with KDB).

I'll start a separate thread about this and keep this thread focused.
Help you could give me some hint in that thread.

>> More importantly I am pointing out that if
>> you are trying to find out information like the location/size/layout of
>> the IGD OpRegion, you can get that information from the host BIOS. That
>> sounded like what your original issues centered around. Sorry if I
>> confused things.
>

Ross, your help is highly appreciated. I think it's not you that
confused things.
The problem comes from my side, I'm far from familiar with all these
ACPI / BIOS related stuff.
I dumped && disassembled the ACPI table. But have no idea how to read
the output...
I attached the DSDT.dsl dumped from my system, in case you would like
to take a quick check.

Just one more question -- is the layout specific to the bios, or common?
I wonder how can we judge the security risk if the layout is not constant.


> Oh and I forgot to add. In addition there are other OpRegions defined like
> GNVS that can give you an idea of what might be just before and after the
> IGD regions when it is not page aligned.

Thanks for your hint, I've seen this -- many of these.
The only issue is that I don't understand what do they mean. :-(
I think I need to dig into specs when I got spare time.

Attachment: DSDT.dsl.gz
Description: GNU Zip compressed data

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