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

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: [Xen-ia64-devel] RE: [PATCH] Add prototype for __get_free_pages
From: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Date: Fri, 2 Sep 2005 08:17:35 -0700
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Thread-topic: [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 MCA
> 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 consider
> 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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