linux-kernel - Re: [RFC][PATCH 2/4] checkpoint/restart: x86 support

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Message-Id: <1218468964.5598.3.camel@nimitz>
Date:	Mon, 11 Aug 2008 08:36:04 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	containers@...ts.linux-foundation.org,
	Theodore Tso <tytso@....edu>, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC][PATCH 2/4] checkpoint/restart: x86 support

On Sun, 2008-08-10 at 07:55 -0700, Jeremy Fitzhardinge wrote:
> Struct pt_regs is not ABI, and can (and has) changed on x86.   It's not 
> suitable for a checkpoint structure because it only contains the 
> registers that the kernel trashes, not all usermode registers (on i386, 
> it leaves out %gs, for example).  asm-x86/ptrace-abi.h does define stuff 
> that's fixed in stone; it expresses it in terms of a register array, 
> with constants defining what element is which register.

Thanks for the explanation.

I just want to reduce the coding and maintenance burden here.  Xen must
do this for partition mobility, right?  Does it define all its own
stuff?

-- Dave

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