Xen devel - Sep 2005 - RE: [PATCH][VT] Patch to allowVMXdomainsto be destroyedor shut down cleanly

Keir Fraser scribbled on 2005年9月20日 17:24:
> On 20 Sep 2005, at 10:17, Li, Chengyuan wrote:
> 
>> 
>> get_page/put_page has already been handled when cr3 updates,
hasn''t
>> it? 
> 
> But it happens unconditionally doesn''t it? What if the guest
writes
> cr3 while paging is disabled, then enables paging in cr0? Won''t
that
> cause us to get_page() twice?
No, in cr3 handler, it only get_page/put_page when paging enabled. If paging is
disabled, no get_page/put_page operations.

   
> 
>   -- Keir
> 
> 
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Thanks,
Chengyuan

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On 20 Sep 2005, at 10:24, Li, Chengyuan wrote:
> No, in cr3 handler, it only get_page/put_page when paging enabled. If 
> paging is disabled, no get_page/put_page operations.
Ok, yep, I see that.

Then I think your patch ought to work. If it''s tested then please send 
as an attachment (I can then easily extract and apply it).

  Thanks,
  Keir


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