RE: [Xen-devel] [PATCH 2/2] balloon driver: don't useapply_to_page_range for xenLinux/ia64

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Keir Fraser
>Sent: 2006年4月28日 21:57
>On 28 Apr 2006, at 10:14, Isaku Yamahata wrote:
>
>> 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.
>
>Okay, but the ia64 ifdefs are unfortunate. Your new scheme will work
>for x86 autotranslated guests too (I'm pretty sure). How about we pick
>between the two schemes based on the autotranslate feature flag rather
>than 'ifdef ia64'?
>
>  -- Keir
>

Yes, that's desired way. Now IA64 scheme is pretty similar to 
auto translated x86 mode where guest page table is unchanged 
when underlying p2m mapping changed by Xen.

Thanks,
Kevin

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