Subject: Re: [RFC][PATCH 2/4] checkpoint/restart: x86 support
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: containers@lists.linux-foundation.org, Theodore Tso <tytso@mit.edu>,
       linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>
In-Reply-To: <489F015E.9080704@goop.org>
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Date: Mon, 11 Aug 2008 08:36:04 -0700
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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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