RE: [Xen-devel] [PATCH] Do not set page's count_info directly

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> On 05/03/2009 14:33, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:
> 
>>> This would be a shadow-code-specific macro. In general count_mask==0 can
>>> also mean the page is free, for example.
>> 
>> Maybe I'm wrong, but anonymous page will have count_mask==0 while they are
>> allocated. 
>> 
>> Currently the only way that we can make sure the guest is free is through
>> the boot allocator bitmap. When the bit is clear, the page is free.
>> When the bit is set, and the count_mask!=0, then it is owned by someone
>> like guest ram, p2m table etc. if the count_mask==0, then it is either a
>> shadow page or a anoynymous page. 
>> 
>> Or do I missed anything?
> 
> You are correct. I only gave one obvious example where count_info==0.

Thanks for your clarification.

-- Yunhong Jiang

> 
> -- Keir
> 
> 
> 
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