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

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 10.12.10 at 12:47, Keir Fraser <keir@xxxxxxx> wrote:
> On 10/12/2010 10:58, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
> 
>>>>> On 10.12.10 at 11:06, Keir Fraser <keir@xxxxxxx> wrote:
>>> Are you looking at xen-4.0? I think you should look at latest xen-unstable
>> 
>> I looked at 4.0 in parallel with -unstable (non-staging) as of
>> yesterday.
> 
> Even before yesterday, xen-unstable benefits from c/s 22388, which is
> intended to work around the iommu=0/x2apic=0 dependency a bit. Not sure if
> it is fully satisfactory. And it is not backported to 4.0 as yet because,
> well, I don't understand this crap enough, basically.

Ah, yes, that makes it better (and I must then have looked at an
older snapshot of -unstable instead).

Still, as you say, a lot of questions remain. On top of what you and
I raised already, I wonder whether the APIC-ID-exceeding-8-bits
case is really being handled correctly now when iommu=0.

Jan


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