RE: [PATCH] remove VHPT_ADDR (was Re: [Xen-ia64-devel] [PATCH] per vcpu vhpt)

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Hi Isaku,

Does this patch work?
Is it for checkin or review?


Anthony

>-----Original Message-----
>From: Isaku Yamahata [mailto:yamahata@xxxxxxxxxxxxx]
>Sent: 2006年10月11日 10:51
>To: Xu, Anthony
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: [PATCH] remove VHPT_ADDR (was Re: [Xen-ia64-devel] [PATCH] per vcpu 
>vhpt)
>
>Hi. I dig out the old patch and updated it.
>
>On Tue, Oct 10, 2006 at 09:31:26AM +0800, Xu, Anthony wrote:
>>
>> >> >non-current vcpu's case must be handled.
>> >> I don't see any issue here, if we use option1, we use identity
>> mapping
>> >> for VHPT, and so we can use 16 MB TR mapping, of cause, 64KB VHPT is
>> >> covered by this 16M TR.
>> >
>> >In fact I had such a patch for the very early version of
>> >the pervcpu vhpt patch.
>> >But I discarded it for some reason. I don't remember clearly why.
>> >Probably I wanted to avoid introducing an implicit dependency
>> >and increasing vcpu context switch overhead.
>>
>> As I know, IA64/LINUX is using this mechanism, the task_struct is 32k,
>> but it uses 16M TR mapping if it is not covered 64M kernel TR.
>>
>> Anthony
>>
>>
>> >
>> >--
>> >yamahata
>>
>> _______________________________________________
>> Xen-ia64-devel mailing list
>> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-ia64-devel
>
>--
>yamahata

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