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[Xen-devel] Re: [PATCH] xen: relax signature check

To: Anthony Liguori <anthony@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] xen: relax signature check
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 12 Dec 2007 11:36:28 -0800
Cc: 7eggert@xxxxxx, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
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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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