linux-kernel - Re: [PATCH] Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"

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Date:	Fri, 04 May 2007 22:12:50 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	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>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "[PATCH] paravirt: Add startup infrastructure
	for paravirtualization"

On Fri, 2007-05-04 at 05:56 -0600, Eric W. Biederman wrote:
> This reverts commit c9ccf30d77f04064fe5436027ab9d2230c7cdd94.
> 
> Entering the kernel at startup_32 without passing our real mode data
> in %esi, and without guaranteeing that physical and virtual addresses
> are identity mapped makes head.S impossible to maintain.

Your assertion that these #ifdef-contained lines of code are "impossible
to maintain" is theatrical.  I'd prefer to wait until we actually have a
replacement before we go ripping out working code.  

Fortunately, I'm working on such code right now.  But as lguest
currently boots with V = P + PAGE_OFFSET, it's not entirely a trivial
matter to change.

Thanks,
Rusty.

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