linux-kernel - Re: [PATCH -mm 1/2] kexec/i386: kexec page table code clean up

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Message-ID: <20080115013409.GB7969@verge.net.au>
Date:	Tue, 15 Jan 2008 10:34:10 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>
Subject: Re: [PATCH -mm 1/2] kexec/i386: kexec page table code clean up -
	add arch_kimage

On Mon, Jan 14, 2008 at 01:29:36PM +0000, Ian Campbell wrote:
> 
> On Thu, 2008-01-10 at 17:15 +0900, Simon Horman wrote: 
> > > Have you tested Xen too? Does it run into issues with this change?
> > 
> > Xen will need to be updated for this change but it shouldn't be a big
> > deal. Basically right now it calls __ma() (which is kind of like __pa())
> > on kexec_pgd and friends. Updating the arguments to __ma() to use
> > the new arch_kimage pointers should be easy enough.
> 
> I think you mean the Xen specific parts of the kexec machinery in the
> kernel.c would need updating rather than the hypervisor, right?

Yes, that is right. Sorry for the confusion.

> I don't think these changes will cause anything more than minor problems
> for whoever ports the Xen kexec stuff upstream.
> 
> > N.B: As this is Dom0 code (not DomU) it is maintained in the xen
> > repository and has been merged into Linux.
> 
> I don't think we would bother backporting these changes to there, would
> we?

No, I was more thinking of the situation where Xen moves its kernel forwards.

-- 
Horms

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