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[Xen-devel] P2M Top Level Page Table
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] P2M Top Level Page Table |
| From: | "Huang2, Wei" <Wei.Huang2@xxxxxxx> |
| Date: | Thu, 29 Mar 2007 11:05:41 -0500 |
| Delivery-date: | Thu, 29 Mar 2007 17:07:02 +0100 |
| Envelope-to: | Keir.Fraser@xxxxxxxxxxxx |
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| Thread-index: | AcdyHBl6ROin1Ah6Tnm0i91fEIxX9g== |
| Thread-topic: | P2M Top Level Page Table |
|
Current P2M table
are allocated through alloc_domheap_pages(), which can potentially allocate
memory with physical address > 4G under PAE mode. However, for top level
P2M table (under PAE mode), its physical address should be below 4G because CR3
has only 32 bits. I noticed that mm.c relies on pae_l3_cache to solve this
problem in make_cr3(). Do we plan to have similar solution for P2M table?
Another solution might use xmalloc; but I just wonder whether it always returns
memory below 4G.
Any
though?
Thanks,
-Wei
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