* L1 page tables and get_pfn_type_batch()
@ 2005-08-16 11:58 Aaron J. Marks
2005-08-16 12:01 ` Jacob Gorm Hansen
0 siblings, 1 reply; 2+ messages in thread
From: Aaron J. Marks @ 2005-08-16 11:58 UTC (permalink / raw)
To: xen-devel
hi all,
i have two questions regarding the page tables of domains.
1. get_pfn_type_batch() seems to have a single-page limit. ie, trying to
get pfn types for an array larger than a page fails. why the restriction?
2. L1 page tables seem to contain mfns of not only L2 pages, but "normal"
pages as well. can anyone explain this?
thanks,
-A.
--
Aaron Marks
Distributed Systems Lab
University of Pennsylvania
www.cis.upenn.edu/~ajmarks
"Strange women lying in ponds distributing swords is no basis
for a system of government."
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: L1 page tables and get_pfn_type_batch()
2005-08-16 11:58 L1 page tables and get_pfn_type_batch() Aaron J. Marks
@ 2005-08-16 12:01 ` Jacob Gorm Hansen
0 siblings, 0 replies; 2+ messages in thread
From: Jacob Gorm Hansen @ 2005-08-16 12:01 UTC (permalink / raw)
To: Aaron J. Marks; +Cc: xen-devel
Aaron J. Marks wrote:
> hi all,
>
> i have two questions regarding the page tables of domains.
>
> 1. get_pfn_type_batch() seems to have a single-page limit. ie, trying to
> get pfn types for an array larger than a page fails. why the restriction?
>
> 2. L1 page tables seem to contain mfns of not only L2 pages, but "normal"
> pages as well. can anyone explain this?
I am just guessing, but perhaps you are confusing Xen's (weird) notion
of what is L1 and what is L2. In Xen, the top-level page directory
(assuming two-level page tables) is considered L2, and the leaf page
tables are considered L1.
Jacob
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2005-08-16 11:58 L1 page tables and get_pfn_type_batch() Aaron J. Marks
2005-08-16 12:01 ` Jacob Gorm Hansen
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