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[Xen-ia64-devel] RE: [PATCH] Add prototype for __get_free_pages

To: "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>
Subject: [Xen-ia64-devel] RE: [PATCH] Add prototype for __get_free_pages
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Sat, 3 Sep 2005 11:51:21 +0800
Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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Thread-index: AcWvmh2j4+gBhyj8S5GMRARNSLan0gAN0MIAABpJYCA=
Thread-topic: [PATCH] Add prototype for __get_free_pages
Actually all the patches I sent out yesterday including this one is for
non-VTI xenolinux, when I debug xen0+xenU. ;-) Currently there's a bit
problem to boot VTI dom0, and Anthony has a fix who will push out soon.

>-----Original Message-----
>From: Magenheimer, Dan (HP Labs Fort Collins)
>Sent: Friday, September 02, 2005 11:18 PM
>To: Tian, Kevin
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: RE: [PATCH] Add prototype for __get_free_pages
>Good catch!  I wonder why this didn't affect non-VTI?  It seems
>like it should have.
>> -----Original Message-----
>> From: Tian, Kevin [mailto:kevin.tian@xxxxxxxxx]
>> Sent: Friday, September 02, 2005 2:42 AM
>> To: Magenheimer, Dan (HP Labs Fort Collins)
>> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: [PATCH] Add prototype for __get_free_pages
>> Due to upgrading to 2.6.13, missing prototypes for several new memory
>> allocate interfaces actually destroy the xenheap. The machine just
>> once xenU is created and executed in metaphysical mode.
>> Missing prototype makes allocated address from __get_free_pages
>> truncated to 32bit:
>>      d->arch.mm->pgd = pgd_alloc(d->arch.mm);
>> In this case, 0xe0000000040f8000 is truncated to 0x40f8000 as the pgd
>> base address. Later when Xen tries to access this table for querying
>> guest physical -> machine mapping, page fault handler doesn't
>> it as legal hypervisor address and something goes weird. Finally MCA
>> happens.
>> Signed-off-by Kevin Tian <Kevin.tian@xxxxxxxxx>
>> Thanks,
>> Kevin

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