linux-kernel - Re: [PATCH] xen: relax signature check

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Date:	Wed, 12 Dec 2007 11:36:28 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Anthony Liguori <anthony@...emonkey.ws>
CC:	7eggert@....de, Andrew Morton <akpm@...ux-foundation.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen: relax signature check

Anthony Liguori wrote:
> If xen-32.0 should be compatible than wouldn't xen-24.0 be compatible
> too?  I think the point was that you should either be checking for
> 'xen-3.x' or something more general that would accept anything >=
> xen-3.0.

The signature is supposed to be an ABI signature, so regardless of the
actual hypervisor version, it should always present "xen-3.0"
(presumably backwards compat if it also supports other versions of the
ABI).  There was a bug in some versions where it puts the actual
hypervisor version in there, requiring this patch.  Technically that
means that looking for "xen-3." is more accurate, but frankly not
important enough to bother raising a patch over.

    J
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