linux-kernel - Re: [RFC PATCH 1/3] Replace paravirt_probe with "platform type" boot header field

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Date:	Fri, 04 May 2007 12:14:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/3] Replace paravirt_probe with "platform type" boot
 header field

Eric W. Biederman wrote:
> 
> And now you understand why I am surveying these things and want to get
> the 32bit entry point well documented.  So the situation doesn't get worse.
> 
> Frankly while I consider what we are doing pretty sane I have always considered
> the 32bit entry point at least partly experimental.  But we have enough users
> of it now and enough reasons to have users of it, that it looks like we need to
> do things a little more methodically.
> 

Indeed.  I think, yes, what has been there up to now has pretty much
been at least in part experimental, and I fear there will be unavoidable
breakage as part of sanitizing it.  C'est la vie, I guess.

>>> And 4K seems to be our maximum size for backwards compatibility.  Although
>>> we use it in a fairly sparse way, so we should be ok.
>> Sort of.  It's pretty full.
> 
> True.  For small little extensions we have room.  For big things probably
> not.

For big extensions we'll probably have to go the pointer route already
done with the command line.

	-hpa
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