linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Message-ID: <m1d51m77ry.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 29 Apr 2007 23:25:53 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeff Garzik <jeff@...zik.org>, Andi Kleen <ak@...e.de>,
	patches@...-64.org, Vivek Goyal <vgoyal@...ibm.com>,
	linux-kernel@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

Rusty Russell <rusty@...tcorp.com.au> writes:

> On Sun, 2007-04-29 at 21:38 -0700, H. Peter Anvin wrote:
>> Rusty Russell wrote:
>> > 
>> > Dammit, Eric, you spend a lot of time using words like "insane" where
>> > you mean we didn't do everything all at once.
>> > 
>> > It's *not* clear that using %esi is sane, but nothing in the current
>> > code prevents that.
>> 
>> Why not?
>
> (I assume you mean why isn't it clear?)
>
> Because VMI uses the presence of a ROM to indicate it's not native.  KVM
> uses a magic MSR IIRC.

Reasonable, if you don't mid a little hardware emulation.

> I think it makes sense for lguest to change over, tho.  Patches welcome
> 8)

Sure.

Peter do we want to use the bootloader byte and assign lguest it's own
bootloader type or do we want to add another field specific to 
paravirtualized environments?

Eric
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