Re: [Qemu-devel] [V6 0/4] AMD IOMMU

[Jan Kiszka]

On 2016-02-22 06:57, David Kiarie wrote:
> On Sun, Feb 21, 2016 at 11:20 PM, Jan Kiszka <address@hidden> wrote:
>> On 2016-02-21 19:10, David Kiarie wrote:
>>> Hello there,
>>>
>>> Repost, AMD IOMMU patches version 6.
>>>
>>> Changes since version 5
>>>  -Fixed macro formating issues
>>>  -changed occurences of IO MMU to IOMMU for consistency
>>>  -Fixed capability registers duplication
>>>  -Rebased to current master
>>
>> I suspect this still has some subtle bugs: I'm running the patches over
>> master with standard Linux distro as guest, full desktop, and I'm
>> getting sporadic segfaults of arbitrary programs. These disappear once I
>> disable the IOMMU or switch to the Intel version.
> 
> Is this L1 guest or L2 guest ? - haven't got any such so far.

It's L1 only.

> 
>>
>> How did you test so far?
> 
> I mainly test by logging. I've tested L1 without any iommu-related
> command line parameters and with L1 with 'iommu=1 iommu=pt'. L2 guest;
> passed-through a device checked it's working correctly, that all.
> These guests barely have any load though.

I quickly reproduced the issue by starting some "heavier" applications,
a browser or an office suite. Something is apparently always corrupted
then, data or code, thus the crashes.

Jan

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