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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

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.


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