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

[David Kiarie]

On Mon, Feb 22, 2016 at 10:29 AM, Jan Kiszka <address@hidden> wrote:
> 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.

Can't reproduce this issue with my ubuntu/debian VMs. Are you using
any iommu-related command line parameters ?

>
> Jan
>
>