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Re: [Fedora-xen] Re: Fedora 11 PV Xen domU (2.6.29.4-167.fc11.x86_64) crash with invalid opcode in xsave_cntxt_init (xsetbv)



On Mon, Sep 21, 2009 at 11:44:44PM +0300, Pasi Kärkkäinen wrote:
> On Mon, Sep 21, 2009 at 01:29:21PM -0700, Jeremy Fitzhardinge wrote:
> > On 09/21/09 12:57, Pasi Kärkkäinen wrote:
> > > Hello Jeremy and others,
> > >
> > > I friend of mine is trying to install x86_64 Fedora 11 Xen PV domU on
> > > CentOS 5.4 x86_64 dom0. He's getting a kernel crash.. so I was wondering
> > > if you've seen this one before.
> > >
> > > A couple of kernel boot/crash logs:
> > > http://v6.fi/misc/f11_64_kernel.debug2.txt
> > > http://v6.fi/misc/f11_64_kernel.debug4.txt
> > >
> > > (early) Kernel command line:  root=/dex/xvda1 ro earlyprintk=xen
> > > (early) Initializing CPU#0
> > > (early) invalid opcode: 0000 [#1] (early) SMP (early)
> > > (early) last sysfs file:
> > > (early) CPU 0 (early)
> > > (early) Modules linked in:(early)
> > > (early) Pid: 0, comm: swapper Not tainted 2.6.29.4-167.fc11.x86_64 #1
> > > (early) RIP: e030:[<ffffffff81397963>] (early)  [<ffffffff81397963>] xsave_cntxt_init+0xba/0x199
> > >   
> > 
> > This looks like the bug where Xen doesn't filter out the xsave feature
> > flag and the kernel tries to use it, fixed in change ef7616ff29ad. 
> > Kernel change  e826fe1ba15 works around the Xen bug by doing its own
> > masking (I think it got into 2.6.30).
> > 
> > There's also a "noxsave" kernel parameter, but that may have been added
> > after 2.6.29.
> >
> 
> Thanks for the fast reply. I'll ask him to try "noxsave". 
> 

It seems "noxsave" kernel parameter was added in Linux 2.6.30, so that
doesn't help for 2.6.29.

-- Pasi


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