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xen-devel
Re: [Xen-devel] [patch] PAE support revisited
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To: |
"Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [patch] PAE support revisited |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Wed, 23 Mar 2005 16:26:47 +0000 |
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Cc: |
"Karen White" <kawhite@xxxxxxxxxx>, "Nuutti Kotivuori" <naked@xxxxxx>, <ian.pratt@xxxxxxxxxxxx>, "Gerd Knorr" <kraxel@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxxx>, "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
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Wed, 23 Mar 2005 16:38:07 +0000 |
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On 23 Mar 2005, at 15:22, Nakajima, Jun wrote:
I like the idea of new macros. The other thing is that the current
shadow code has issues with supporting 32-bit unmodified guests on
x86_64 (e.g. VMX domain). For example, the following does not work, and
we need new definitions (e.g. l1_pgentry_32_t) for that purpose.
typedef struct { unsigned long l1_lo; } l1_pgentry_t;
typedef struct { unsigned long l2_lo; } l2_pgentry_t;
The linear page table does not work either, because the page table
entries are different (i.e. 4-byte vs. 8-byte). I think we need to get
the current shadow code working for 2-level page tables on both x86 and
x86_64 first, then extend it to support 3/4-level page tables, probably
in a sperate file?
I suspect there may be a lot of commonality between the code for
handling different pagteable arrangements (2 vs. 3 vs 4 level, and
4-byte vs 8-byte PTEs). Rather than duping the code for each case,
maybe we can have one codebase with minimal ifdef's that works with the
l_pgentry types, then perhaps gets compiled multiple times with
different-size types and macros differently defined?
As you say, it's probably best to consider the best course of action
after we have x-type guest working on x-type host (for x ==
x86/32,PAE,x86/64).
-- Keir
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