[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] More page-table questions.



On 12/3/07 16:26, "Petersson, Mats" <Mats.Petersson@xxxxxxx> wrote:

> Are the page-tables ever updated directly by the guest, or is it all
> done via hyper-calls?

Leaf PTEs (i.e., really just PTEs, not PDEs) can be directly written from
the point-of-view of the guest. In fact they are trapped and emulated by
Xen. The guest is somewhat aware of this because it has explicitly
write-protected all its pagetables, so if it were to attempt the direct
write on native hardware in these circumstances it would receive a page
fault.

 -- Keir


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.