Re: [Xen-devel] Xen 3.1 - Can't run Fedora Core 1 PV

[Nick Craig-Wood <nick@xxxxxxxxxxxxxx>]

On Thu, Jul 19, 2007 at 02:50:12PM +0100, Ian Campbell wrote:
> On Thu, 2007-07-19 at 14:33 +0100, Nick Craig-Wood wrote:
> > On Thu, Jul 19, 2007 at 01:29:31PM +0100, Ian Campbell wrote:
> > > On Thu, 2007-07-19 at 12:59 +0100, Nick Craig-Wood wrote:
> > > > Any ideas? 
> > > 
> > > Could you try reverting
> > > http://xenbits.xensource.com/xen-unstable.hg?rev/98eacf1b075c
> > 
> > No change in symptoms unfortunately :-(
> 
> Hmm, I'm starting to clutch at straws now then :-(
> 
> Could you try adding "vdso=0" to the kernel command line.

A good clutch!

That fixes the problem.  The original kernel I started with works fine
with vdso=0 as does the xen 3.1 binary release.

As I understand it vdso enables use of the faster sysenter rather than
int80 for sys calls.  So disabling it will slow down syscalls slightly
but otherwise shouldn't matter.  Is that right?

Thanks for all your help

Nick
-- 
Nick Craig-Wood <nick@xxxxxxxxxxxxxx> -- http://www.craig-wood.com/nick

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