linux-kernel - Re: [PATCH 0/14] KVM: Kernel-based Virtual Machine (v4)

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Message-Id: <20061107233323.c984fa9b.akpm@osdl.org>
Date:	Tue, 7 Nov 2006 23:33:23 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Roland Dreier <rdreier@...co.com>, kvm-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/14] KVM: Kernel-based Virtual Machine (v4)

On Wed, 08 Nov 2006 09:14:50 +0200
Avi Kivity <avi@...ranet.com> wrote:

> Roland Dreier wrote:
> >  > That's gas 2.16.1.  I assume it needs some super-new binutils.
> >  > 
> >  > I'm not sure what to do about this.  What's the minimum version?
> >
> > According to http://kvm.sourceforge.net/howto.html :
> >     A recent enough binutils (>= 2.16.91.0.2) for vmx instruction support
> >   
> 
> Either that or a bunch of ugly .byte macros.
> 

I think we could live with the binutils requirement as long as we can find
some automagic way of not breaking people's `make allmodconfig'.  Because
quite a lot of those people who do cross-compilation tend to use older
binutilses.

But I don't know how to do that.  We _could_ do a trick similar to the
`cc-version' make rule, and then use the new `as-version' to make the whole
kvm.o compile down to an empty .o file.  But that's pretty hacky.  Would
really prefer something at Kconfig-time, but we have no way of letting the
assembler version feed into the Kconfig system (nor do we want it, I
suspect).

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