linux-kernel - Re: [ANNOUNCE] kvm howto

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Message-ID: <aec7e5c30611020714qe6bcc41ucc789e3a2ca85c1f@mail.gmail.com>
Date:	Fri, 3 Nov 2006 00:14:00 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"Avi Kivity" <avi@...ranet.com>
Cc:	"Hesse, Christian" <mail@...thworm.de>,
	kvm-devel@...ts.sourceforge.net,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>
Subject: Re: [ANNOUNCE] kvm howto

On 11/2/06, Avi Kivity <avi@...ranet.com> wrote:
> Hesse, Christian wrote:
> > On Thursday 02 November 2006 14:25, Avi Kivity wrote:
> >
> >> I've just uploaded a HOWTO to http://kvm.sourceforge.net, including
> >> (hopefuly) everything needed to get kvm running.  Please take a look and
> >> comment.
> >>
> >
> >   CC [M]  /tmp/kvm-module/kvm_main.o
> > {standard input}: Assembler messages:
> > {standard input}:168: Error: no such instruction: `vmxon 16(%esp)'
> > {standard input}:182: Error: no such instruction: `vmxoff'
> > {standard input}:192: Error: no such instruction: `vmread %eax,%eax'
> > {standard input}:415: Error: no such instruction: `vmwrite %ebx,%esi'
> > {standard input}:1103: Error: no such instruction: `vmclear 16(%esp)'
> > {standard input}:1676: Error: no such instruction: `vmptrld 16(%esp)'
> > {standard input}:4107: Error: no such instruction: `vmwrite %esp,%eax'
> > {standard input}:4119: Error: no such instruction: `vmlaunch '
> > {standard input}:4121: Error: no such instruction: `vmresume '
> >
> > I get a number of errors compiling the module. No difference between the
> > downloaded tarball and my patched kernel tree. Any hints?
> >
>
> You need a newer binutils.  I'm using binutils-2.16.91.0.6 (gotta love
> that version number), shipped with Fedora Core 5.

The VT-extensions added by Intel and AMD only adds a limited number of
instructions each. If you want to be user friendly it might be a good
idea to implement these instructions as macros. I'm pretty sure
VT-extension support in Xen works with my old binutils version.

/ magnus
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