From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 76331] kernel BUG at drivers/iommu/intel-iommu.c:844!
Date: Wed, 28 May 2014 10:41:50 +0000
Message-ID: <bug-76331-28872-j5BykTi2V6@https.bugzilla.kernel.org/>
References: <bug-76331-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=76331

--- Comment #5 from Matt <mspeder@users.sourceforge.net> ---
Hi Alex,

Great news !
Yesterday I had the opportunity to recompile my kernel with your suggested fix
in intel-iommu driver : dmar_domain->gaw = min(dmar_domain->gaw, addr_width);

After multiple tests I can confirm that this successfully fixed the issue.
How can we have this integrated in the official kernel sources ?

I also tried to re-order the qemu command-line...
With or without the fix I don't see any difference and I always end up with
various problems related to the gpu pass-thru :
- one VM blue screen at boot (VIDEO_TDR_ERROR)
- one Host crash !
- driver error (code 43) and dmesg full of errors like :
[ 2283.900194] dmar: DMAR:[DMA Read] Request device [06:00.0] fault addr
12de0a000 
DMAR:[fault reason 12] non-zero reserved fields in PTE
[ 2283.900201] dmar: DMAR:[DMA Write] Request device [06:00.0] fault addr
aff93000 
DMAR:[fault reason 12] non-zero reserved fields in PTE
[ 2286.149141] dmar: DRHD: handling fault status reg 602

But I'm not sure if this problem is related...

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