Re: Xen 4.0 crashes with pvops kernel

["Jan Beulich" <JBeulich@novell.com>]

>>> On 15.06.10 at 15:49, Cris Daniluk <cris.daniluk@gmail.com> wrote:
> On Tue, Jun 15, 2010 at 9:43 AM, Jan Beulich <JBeulich@novell.com> wrote:
>>>>> On 15.06.10 at 15:24, Cris Daniluk <cris.daniluk@gmail.com> wrote:
>>> For what its worth, it happened in 2.6.32.11 in addition to 2.6.32.13.
>>> I also had earlier tried a 2.6.31 pvops distro kernel with the same
>>> results last week. Interestingly, I also tried a 2.6.31 kernel with
>>> Xen 3.4 on the same hardware with no issues. It seems like XenLinux
>>> kernel with Xen 4.0 is fine, and pvops with Xen 3.x is fine.
>>
>> That's odd, but perhaps the kernel behaves differently on older Xen.
>> Attempts to map IO-APIC space should be disallowed by 3.4 just as
>> with 4.0.
>>
> 
> SSDT and DSDT dumps attached.

_SB.PCI0._CRS clears bit 16 of indirect register 0x2e, i.e. it masks pin 15
of the second IO-APIC. The motivation of this is unclear to me (and
can probably only be explained by the writers of that code) - perhaps
a workaround for some erratum?

Jan