linux-kernel - Re: [patch 5/5] elf: Add support for loading ET

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Date:	Wed, 19 Oct 2011 23:56:32 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrey Vagin <avagin@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Glauber Costa <glommer@...allels.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [patch 5/5] elf: Add support for loading ET_CKPT files

On Wed, Oct 19, 2011 at 11:22:28AM -0700, Tejun Heo wrote:
> Hello, Pavel.
> 
> On Wed, Oct 19, 2011 at 01:03:17PM +0400, Pavel Emelyanov wrote:
> > > I don't think this is a good idea.  We already have most of interface
> > > necessary for restoring task state and there's no need to put it into
> > > the kernel as one piece.  If there's something which can't be done
> > > from userland using existing interfaces, let's please discuss what
> > > they are and whether they can be resolved differently first.
> > 
> > The rest API we will require will look too special-purpose (like Cyrill
> > mentioned the ability to set the mm's fields such as start_code, etc).
> 
> I find that quite difficult to agree with.  We're talking about some
> minor additions to prctl against updating exec path to do something it
> was never designed to do + new binary format.

Tejun, regardless the mm_struct entries, what about mapping vdso pages at the
place they had on snapshot time? How would we handle them?

	Cyrill
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