RE: PAE dom0 is broken with the default config

[Boris Ostrovsky <bostrovsky@virtualiron.com>]

>> I built PAE Xen with the default config, and it is not 
>> booting. Log is bellow. If I replace the 
>> linux-defconfig_xen_x86_32 file with the 
>> linux-defconfig_xen0_x86_32 before building then dom0 is able 
>> to boot and see more than 4Gig memory. This looks like a dom0 
>> kernel config issue. Do you care PAE dom0 for 3.0.2 with the 
>> default config? Is anybody working on this?
>
>
> This seems pretty unlikely to be a PAE issue -- we do quite extensive
> testing.
>
> Are you sure you have the right initrd? Is the same scsi driver being
> used as in the -xen0 case?

I suspect there may indeed be some sort of problem with PAE. I have domU RHEL4-U2
SMP 32-bit kernel that dies when it tries to set PAE bit in CR4 --- it
can't find translation for the next instruction (and for anything else, for
that matter: it keeps then getting GPFs on ignore_int's first instruction).

UP version of the same kernel and SMP versions of other kernels, such as 2.6.16,
don't have this problem.

-boris