linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Message-ID: <47996895.3010703@goop.org>
Date:	Thu, 24 Jan 2008 20:41:57 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Ian Campbell <ijc@...lion.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Mika Penttilä <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native
 format.

Eric W. Biederman wrote:
> Note.  I don't believe we use either trampoline (cpu startup or acpi wakeup)
> in the hypervisor case (esp Xen).  So we should be able to completely ignore
> Xen and do the memcpy of pgd entries.
>   

Indeed.  The alias mapping can be set up in 
native_pagetable_setup_done() and needn't involve Xen at all.

> I expect Xen gives us other cpus already in protected mode (which is overall
> the sane thing to do).

Quite so.

    J
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