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xen-devel
Re: [Xen-devel] [PATCH]HVM E820 Table cleanup
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To: |
Gerd Hoffmann <kraxel@xxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH]HVM E820 Table cleanup |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Tue, 24 Oct 2006 10:57:25 +0100 |
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Cc: |
Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Wang, Winston L" <winston.l.wang@xxxxxxxxx>, Christian.Limpach@xxxxxxxxxxxx |
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Tue, 24 Oct 2006 02:57:58 -0700 |
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[Xen-devel] [PATCH]HVM E820 Table cleanup |
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On 24/10/06 10:50, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote:
>> According to ACPI spec, OS may use e820 ACPI_DATA region as RAM after OS
>> boots up (but acturally Linux doesn't use it).
>> But for memory ACPI tables reside, OS can not use like that.
>
> On a related topic: how about the e820 tables itself? Right now they
> are at 0x00090000 (E820_MAP_PAGE), that is within a region listed as
> normal RAM, which looks wrong ...
They get copied to 0xe0000 by rombios before the guest OS ever runs. The
early start-of-day RAM map in the low 1MB (as seen by the builder and by
hvmloader) does not really correspond to the contents of the e820 table.
It's arguable that it would be less confusing for rombios (or even
hvmloader) to generate the e820 table.
-- Keir
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