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[Xen-devel] RE: recreate monitor page table?

  • To: "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx>
  • From: "Li, Xin B" <xin.b.li@xxxxxxxxx>
  • Date: Thu, 19 Apr 2007 00:02:16 +0800
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 18 Apr 2007 09:01:12 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AceB0pLTF62j+50DToyg31UstoNQ9QAADsPQ
  • Thread-topic: recreate monitor page table?

>At 23:46 +0800 on 18 Apr (1176940011), Li, Xin B wrote:
>> On x86_64, monitor page table should always be 4 level, and we can
>> uninstall the old shadow linear entry and install new shadow 
>paging mode
>> entry, why even recreate the monitor top level page?
>We could have made a routine to adjust the layout of the monitor table
>given the old and new modes, but it would have to understand two modes
>at once, which nothing else in multi.c does.  It would also reproduce 
>code that's already in sh_make_monitor_table and
>Since we don't expect it to be worth optimizing this path, we just used
>the existing routines.

Quite clear to me now :-)


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