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Re: [Xen-devel] conditional clearing of dom0_l2 in i386's zap_low_mappin

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] conditional clearing of dom0_l2 in i386's zap_low_mappings() ?
From: Keir Fraser <keir@xxxxxxx>
Date: Fri, 29 Oct 2010 08:02:21 +0100
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Thread-topic: [Xen-devel] conditional clearing of dom0_l2 in i386's zap_low_mappings() ?
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On 29/10/2010 07:51, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>> Oh I see. Well possibly. But you might still need the conditional for the
>> other three slots anyway, so it wouldn't be a simplification in that case.
> I'm not after a simplification really. I'm trying to eliminate some
> restrictions on initrd size (as well as possible collisions between
> the various memory areas used during early boot), and in the
> process I need to switch the 1:1 mapping of the first Gb to a
> more flexible model (the target is x86-64, but to avoid adding
> more conditionals in the Dom0 building code I prefer to do the
> same to i386 too).
> I was just asking because I may need to flush out temporary
> mappings in Dom0's first L2 that wouldn't match those under
> idle_page_table_l2[0] (though right now I think I may get away
> without having to).

I'd prefer we don't mess around with the i386 boot process really. The build
is obsolescent - anyone wanting big initrds should run the 64-bit build of
Xen. Who doesn't have a 64b processor these days, really?

 -- Keir

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