linux-kernel - Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'

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Message-ID: <4DBEEA69.7010000@zytor.com>
Date:	Mon, 02 May 2011 10:31:21 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, stefano.stabellini@...citrix.com,
	yinghai@...nel.org, xen-devel@...ts.xensource.com
Subject: Re: [PATCH] Two patches fixing regression introduced by 'x86-64,
 mm: Put early page table high'

On 05/02/2011 10:22 AM, Konrad Rzeszutek Wilk wrote:
> 
> But we haven't come up with an acceptable general solution yet, so this
> patchset provides a workaround for the problem. Peter, Yinghai - what would be
> the best forum/email/conference to hammer out a general solution for this?
> 
> Currently, there are couple of ways of fixing this:
>  - use pvops hooks: http://marc.info/?i=1302607192-21355-2-git-send-email-stefano.stabellini@eu.citrix.com
>  - have a workaround in Xen MMU's early bootup code (which is what these
>    two patches to this email have).
>  - or remove the patch introducing the regression altogether.
> 
> Foremost important is to fix the regression, and attached patches 
> achieve that. I want to remove this workaround patch when we
> hammer out more appropriate semantics for the page table creation - but
> that will take some time and the runway to do that in 2.6.39 is gone.
> 

My inclination would be to apply your workaround -- are there any
adverse effects to doing that?

	-hpa

[Sorry if I have missed any emails recently... apparently my email was
significantly on the fritz over the last few days.]
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