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xen-devel
RE: [Xen-devel] [patch] PAE support revisited
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To: |
"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, "Gerd Knorr" <kraxel@xxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [patch] PAE support revisited |
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From: |
"Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Date: |
Wed, 23 Mar 2005 07:22:27 -0800 |
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Cc: |
"Karen White" <kawhite@xxxxxxxxxx>, "Nuutti Kotivuori" <naked@xxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxxx>, <ian.pratt@xxxxxxxxxxxx>, <ian.pratt@xxxxxxxxxxxx> |
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Wed, 23 Mar 2005 15:30:55 +0000 |
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Thread-topic: |
[Xen-devel] [patch] PAE support revisited |
Ian Pratt wrote:
>>> * cleanup use of 'unsigned long' that exists in some handling of
>>> PTEs. We've agreed a strategy of doing this with Gerd
>>
>> Next version of this cleanup patch, comments are welcome.
>
> Gerd, I think this patch is definitely the right idea.
>
> I don't particularly like the names of your macros, but I can't think
> of any better.
>
> The init_0 is rather superfluous.
>
>> Handle with care for now. It builds and boots domain0 fine for me.
>> But will break the x86_64 build and isn't tested much otherwise.
>
> Let's get the new shadow mode code checked in, then get everything
> (including x86_64) switched over to the new macros.
>
> Ian
>
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?
Jun
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