Re: kvm_mmu doubts

[Avi Kivity <avi@qumranet.com>]

Sukanto Ghosh wrote:
>> Sukanto Ghosh wrote:
>>     
>>> I am calling the entire tree-like structure (including the page
>>> directories) as a page table. In the above statement are you referring
>>> to
>>> the same ? Or is it the last-level table that holds translated physical
>>> addresses (+ dirty  bit, etc ) ?
>>>
>>>       
>> No, any guest page that is part of the structure. Note the structure is
>> not a tree, since multiple roots exist and as it may be cyclic.
>>
>>     
>
> I understand that it is not a tree and that in case of sharing and
> aliasing, multiple roots will exist. But, how can it be cyclic ? (Are you
> not considering directionality or is it because the nodes in this
> structure do have pointers to the parents or there is something else as
> well ?)
>   

A page-directory entry can point at the page directory (some OSes do this).

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.