RE: [Xen-devel] iommu=0 leading to panic when system defaults to using x2apic

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 14.12.10 at 17:53, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
>>  And why is it that Xen panics when the BIOS pre-enabled x2apic
>> mode without also enabling interrupt re-mapping, while Linux
>> (afaict from looking at 2.6.32 code and output from an affected
>> machine) simply enables interrupt re-mapping in this case?
> 
> AFAIK, Linux also requires interrupt remapping for x2apic.  I believe 
> Weidong has fixed the panic issue in Xen when x2apic is enabled without 
> enabling interrupt remapping.  It should now behave the same way as Linux.

No - just look at the very first if() in enable_bsp_x2apic().

Jan


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