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From: Anthony Liguori <aliguori@us.ibm.com>
To: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com, Himanshu Raj <rhim@cc.gatech.edu>
Subject: Re: Regarding page table management changes from Xen v1to	Xen v2 (and v3)
Date: Wed, 26 Apr 2006 18:33:18 -0500	[thread overview]
Message-ID: <4450033E.7070505@us.ibm.com> (raw)
In-Reply-To: <A95E2296287EAD4EB592B5DEEFCE0E9D4BA489@liverpoolst.ad.cl.cam.ac.uk>

Ian Pratt wrote:
>>> On 64b we could use the 1:1 mapping of all physmem that Xen has. 
>>> Obviously that is infeasible on 32b. In fact the interface 
>>>       
>> (passing a 
>>     
>>> virtual address) pretty much means we have to use a linear 
>>>       
>> mapping in 
>>     
>>> both cases.
>>>       
>> Couldn't we temporarily map the page table page?  Not that we 
>> would actually want to do that.  Just trying to confirm my understand.
>>     
>
> Sure, but that's expensive on 32b as map_domain_mem has to do real work
> (it's cheap on 64b as we have a 1-to-1 map of machine memory).
>   

Excellent, that's just what I thought.

Thanks Ian!

Regards,

Anthony Liguori

> Ian
>   

  reply	other threads:[~2006-04-26 23:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-26 20:00 Regarding page table management changes from Xen v1to Xen v2 (and v3) Ian Pratt
2006-04-26 23:33 ` Anthony Liguori [this message]
2006-04-27  8:23   ` Keir Fraser
  -- strict thread matches above, loose matches on Subject: below --
2006-04-26 20:49 Nakajima, Jun
2006-04-26 18:04 Ian Pratt
2006-04-26 18:15 ` Anthony Liguori
2006-04-26 18:13   ` Keir Fraser
2006-04-26 18:19     ` Anthony Liguori
2006-04-26 17:51 Ian Pratt

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