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[Xen-devel] Re: [PATCH 2/4] x86, xen: introduce x86_init.mapping.pagetab

To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 2/4] x86, xen: introduce x86_init.mapping.pagetable_reserve
From: "H. Peter Anvin" <hpa@xxxxxxxxx>
Date: Mon, 18 Apr 2011 07:42:55 -0700
Cc: "jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "konrad.wilk@xxxxxxxxxx" <konrad.wilk@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "mingo@xxxxxxx" <mingo@xxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>, "yinghai@xxxxxxxxxx" <yinghai@xxxxxxxxxx>
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On 04/18/2011 07:09 AM, Stefano Stabellini wrote:
> Sorry, I don't mean to be pushy, it is just that I'll be AFK for 12 days
> starting from next Friday and I think that this issue should really be
> fixed in time for the 2.6.39 release, otherwise no 2.6.39 kernels will
> be able to boot on any xen system.


The semantics of a hook is a description of what the preconditions are,
what the postconditions are, and what exactly they are allowed or not
allowed to do.

This is a real pain to do, *exactly because hooks are a real pain*.
Most hooks that have been put in has been "oh, just do something at
point X in the code", which is a case of definition by implementation,
which is exactly how we ended up with the current mess.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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