linux-kernel - Re: [PATCH v6 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX

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Date:	Mon, 23 Jun 2014 17:10:23 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH v6 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER,
 PR_MPX_UNREGISTER

On 06/23/2014 05:01 PM, Andy Lutomirski wrote:
> I suspect that the existence of the get operation matters more.  What
> if the checkpointed process has the cached copy out of sync with the
> register copy?  More realistically, what if the checkpointed process
> doesn't want to use kernel MPX assistance at all?  CRIU won't be able
> to detect this with the current proposed interface.

That's fair criticism.

Pavel, do you have any concrete suggestions on what kind of interface
would be nice for checkpoint/restart?  Or is this something you will
just tackle down the road some other way?
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