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SubjectRe: [Xen-devel] [PATCH] let XEN depend on PAE
Arnd Hannemann wrote:
> Jeremy Fitzhardinge wrote:
>
>> Arnd Hannemann wrote:
>>
>>> This is with 2.6.24.2, but latest-git looks the same:
>>> I also tried with 2.6.23 which crashes instantly, without any output
>>> of the guest.
>>>
>>>
>> I'm not too surprised. Non-PAE Xen is a bit of a rarity, and it only
>> gets tested rarely. Chris Wright did spend some time on it a while ago,
>> but I don't know that its had any real attention since. I've been
>> making sure non-PAE compiles, but I've been lax about testing it.
>> This is the first usermode exec, I guess? The backtrace is a bit odd;
>> I've never seen a problem in move_page_tables before.
>>
>
> Yes its trying to execute the first script in initramfs, I also tried with initramdisk
> and got a similar error. (move_page_tables also involved)
>
>
>> Does "xm dmesg" tell you what Xen is complaining about? You may need to
>> compile with debug=y in Config.mk.
>>
>
> (XEN) mm.c:645:d44 Non-privileged (44) attempt to map I/O space 00000000
>
> I will recompile with debug=y and post the output.
> If I reduce the dom0 memory with dom0_mem=200000 I see something like
> 00000080 with dom0_mem=800000 I always see 00000000.
>

That's helpful. Looks like the mfn is getting mushed to 0.

J


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