[Xen-devel] Re: 4.0/4.1 requests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.09.11 at 12:48, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:

> 
> On 08/09/11 11:17, Keir Fraser wrote:
>> On 08/09/2011 10:19, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>>
>>> Hi Keir,
>>>
>>> without the old IO-APIC part addressed, I wonder whether we should
>>> really have the backport of 23805:7048810180de ("IRQ: manually EOI
>>> migrating line interrupts") in both trees.
>> It does fix a real bug. Perhaps Andrew could hack up a patch to make it
>> dependent on IO-APIC version?
> Now that I am not racing against a release deadline, this is a
> possibility.  It probably means falling through to the "fake an EOI for
> line level interrupt code", as the Status bit is RO in the IO-APIC (The
> IRR bit is RW but both need updating)
> 
> Does anyone know which revision of the IO-APIC was the first with an EOI
> register?

As Keir said, code already exists which does this version check. But
to answer explicitly: It's version 0x20.

Jan


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