Re: [Xen-devel] AMD IOMMU disabled - No Perdev Intremap

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Sunday, October 6, 2013, 7:57:42 PM, you wrote:

> On 10/06/2013 07:45 PM, Sander Eikelenboom wrote:
>> 
>> Sunday, October 6, 2013, 7:28:03 PM, you wrote:
>> 
>>> On 10/06/2013 04:38 PM, Sander Eikelenboom wrote:
>>>> 
>>>> Sunday, October 6, 2013, 3:09:54 PM, you wrote:
>>>> 
>>>>> On 10/06/2013 02:58 PM, Andrew Cooper wrote:
>>>>>> On 06/10/2013 13:56, Ferdinand Nölscher wrote:
>>>>>>> Hi Sander,
>>>>>>> 
>>>>>>> Thanks for your reply.
>>>>>>> 
>>>>>>> On 10/06/2013 02:10 PM, Sander Eikelenboom wrote:
>>>>>>>> Sunday, October 6, 2013, 1:36:33 PM, you wrote:
>>>>>>>> 
>>>>>>>>> Hi!
>>>>>>>>>> From other people posting to this list, I know
>>>>>>>>>> that there has been a
>>>>>>>>> bug related to the issue described in Xen Security 
>>>>>>>>> Advisory 36 that disables iommu for some AMD users
>>>>>>>>> like me.
>>>>>>>> What motherboard do you have ?
>>>>>>> I have an ASUS M5A99X EVO Rev 1.01
>>>>>>> 
>>>>>>> 
>>>>>>>> It depends if it's the north or southbridge ioapic but
>>>>>>>> try using the new xen boot parameter: (add it to the
>>>>>>>> xen.gz line in grub)
>>>>>>>> 
>>>>>>>> ivrs_ioapic[0]=00:14.0
>>>>>>>> 
>>>>>>>> or
>>>>>>>> 
>>>>>>>> ivrs_ioapic[0]=00:00.1
>>>>>>> I tried both, it still fails to enable i/o
>>>>>>> virtualisation.
>>>>>> 
>>>>>> Can you post a full xl dmesg, booting with
>>>>>> iommu=debug,verbose as well?
>>>>>> 
>>>>>> ~Andrew
>>>>>> 
>>>>>> 
>>>> 
>>>> Ah it seems i got the id's mixed up :-)
>>>> 
>>>> ivrs_ioapic[9]=00:00.1 ivrs_ioapic[10]=00:14.0
>>>> 
>>>> Should do it i guess .. or should the ioapic handle be in hex
>>>> .. (then the last should be ivrs_ioapic[a]=00:14.0 )
>>>> 
>>>> -- Sander
>>>> 
>> 
>>> Booting with this parameters I can see "I/O Virtualisation
>>> Enabled" but shortly after that, I get a CPU Panic:
>> 
>>> Xen Call Trace: amd_iommu_ioapic_update_ire ... 
>>> iommu_update_ire_from_apic ... set_ioapic_affinity_irq ... 
>>> smp_cpus_done ... __start_xen ...
>> 
>>> Panic on CPU 0: Assertion "get_rte_index(rte) == offset" failed
>>> at iommu_intr.c:188
>> 
>> 
>> Hmm, could you check if you can get a recent linux kernel to boot
>> on baremetal (so without xen) with the iommu enabled ? (that would
>> most certainly require one or both of the ivrs_ioapic overrides as
>> well)
>> 
>> I assumed but don't know for sure, did you previously had
>> successfully used the iommu with the
>> iommu=no-amd-iommu-perdev-intremap boot option ? And i understand
>> you upgraded your bios, if the previous answer was yes .. did you
>> try to revert to your previous bios version ?
>> 
>> Also added Jan and Suravee to the CC.
>> 
>> -- Sander
>> 
>> BTW: please keep everyone that was in the CC listed in replies.
>> 
>> 
>> _______________________________________________ Xen-devel mailing
>> list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
>> 
>> 

> What "recent" version? Currently, I'm using 3.10-3, is that ok?

I think so, you will need this patchset in the kernel:
http://lkml.indiana.edu/hypermail/linux/kernel/1304.1/01567.html
which implemented the overrides for linux.


> I have used iommu successfully before they added the new checking
> stuff, so I can't tell for sure.
> I just tried the new xen version because it kept panicking after some
> changes half a year ago. Now it's working again but without iommu.
> That's why I updated my bios, sadly, without any success.

I know the pain :-)

> I'll try booting with Andrews patch now.

> kind regards



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