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Re: [Xen-devel] [PATCH 2/2] balloon driver: don't use apply_to_page_rang

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/2] balloon driver: don't use apply_to_page_range for xenLinux/ia64
From: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date: Fri, 28 Apr 2006 18:14:51 +0900
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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On Fri, Apr 28, 2006 at 08:00:30AM +0100, Keir Fraser wrote:

> The existing code should work on ia64, right? It's not performance  
> critical code.

Unfortunately no.
Roughly init_mm is only used to map vmalloc area on Linux/ia64.
init_mm of Linux/ia64 doesn't map the area of [PAGE_OFFSET, ...].
Traversing init_mm with a virtual address of the area
gives a zero-filled pte entry.
It also populates unnecessary pud/pmd/pte pages.

Linux/ia64 resolves faults on the area [PAGE_OFFSET, ...]
by tlb insert without init_mm traverse after checking
faulted virtual address and its privilege.


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