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RE: [Xen-devel] understanding __linear_l2_table and friends
| To: | "Gerd Knorr" <kraxel@xxxxxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] understanding __linear_l2_table and friends |
| From: | "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
| Date: | Wed, 20 Apr 2005 17:25:15 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, Scott Parish <srparish@xxxxxxxxxx> |
| Delivery-date: | Wed, 20 Apr 2005 16:25:01 +0000 |
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| Thread-index: | AcVFw3/i2XF2rMISR06rjML/tPC3TgAAN8rQ |
| Thread-topic: | [Xen-devel] understanding __linear_l2_table and friends |
> > Xen uses the common trick whereby each page directory maps itself. > > This means that every page-table entry is mapped into the address > > space at some virtual address. > > Well, in PAE mode that trick doesn't fully work. It will do > fine for the l1 tables, I think also for l2, but certainly > not for l3 due to address space constrains ... ??? The linear tables for PAE will consume 8MB of VA space, and all the current processes's L1, L2 and L3 pages will all be contained within the linear table. You can use the linear table to update any PTE in the domain's currrent address space by virtual address. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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