All of lore.kernel.org
 help / color / mirror / Atom feed
* 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

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-08-16 12:01 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2005-08-16 11:58 L1 page tables and get_pfn_type_batch() Aaron J. Marks
2005-08-16 12:01 ` Jacob Gorm Hansen

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.