RE: [Xen-users] Re: [Xen-devel] Linux hangs during reboot on Jeremy's git kernel

[Mike Viau <viaum@xxxxxxxxxxxxxxx>]

> Date: Mon, 8 Feb 2010 13:02:55 -0500
> From: konrad.wilk@xxxxxxxxxx
> To: mike.viau@xxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Re: [Xen-devel] Linux hangs during reboot on Jeremy's git kernel
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
>
> On Mon, Feb 08, 2010 at 12:27:41PM -0500, Mike Viau wrote:
> >
> > > Date: Mon, 8 Feb 2010 10:48:29 -0500
> > > From: konrad.wilk@xxxxxxxxxx
> > > To: mike.viau@xxxxxxxxxxxxxxx
> > > CC: ahmad.hassan@xxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
> > > Subject: [Xen-users] Re: [Xen-devel] Linux hangs during reboot on Jeremy's git kernel
> > >
> > > On Sat, Feb 06, 2010 at 09:58:13AM -0500, Mike Viau wrote:
> > > >
> > > > Attached is a screen shot of the last messages I recieve during a system reboot.
> > > >
> > > > Note: The power is never cycled and Linux apprears to hang.
> > > >
> > > > Is there something else I can try to resolve this issue?
> > >
> > > I have the same issue (AMD development hardware) so I believe we haven't
> > > fixed out all the bugs. If you are interested in resolving this I can
> > > give you some ideas where to poke in the kernel/hypervisor code.
> > >
> >
> > Absolutely,
> > what can I do to help!
>
> Need to narow down under what situations the kernel/hypervisor shuts
> properly the machine.
>
> For that we need to do a couple of variants:
>
> a). Bare-metal. Boot pv-ops and shutdown. Does it do it?

 Yes oddly enough, shutdown is fine, only hangs on reboot.

 Also I'd like to note I am only using the kernel as a bare-metal kernel, so I have not loaded it as a module in grub with the hypervisor.

> b). If it does not, try an earlier kernel or a distro supplied one.
>
> If the a) or b) don't work then you have a very unique motherboard
> and we will need to play a bit with 'reboot=' command line arguments.
> Look in arch/x86/kernel/reboot.c for details.
>

 I have tried using different reboot=X kernel command line arguments, but none of them have correct the rebooting issue. In fact the system hangs the same way in all cases.
 
> Lets assume that a) or b) do work. We want to find out what it does
> to the machine. You can instrument the code (reboot.c?) and find out
> which mechanism it uses.
>

 I know that the system reboot fine with the Debian 2.6.26-2-amd64 kernel. Please suggest how one might compare these kernels reboot.c. Shall I simply run the diff utility. I can read C source, but to truly understand it I feel I need to have written the code... With help I believe I can find the mechanism it uses.

> Make sure the Xen hypervisor uses the same mechanism. You can toggle
> those flags with the 'reboot=' arguments (look in arch/x86/shutdown.c)
> After that, if you know that the reboot mechanism used by the bare-metal
> is the same as the one used by the hypervisor, then there is something
> amiss in the hypervisor that will have to be updated.

 Same for shutdown.c, perhaps you could be more precise on what to look for. I could send you the files from my system if you'd like?


>
> P.S.
> What is weird is that your screenshot says "machine reboot" which only
> shows up when you are running on bare-metal. Was that screen shot taken
> when pv-ops was running under Xen or bare-metal?

 As mentioned previous, I was using bare-metal indeed. Should I expect the reboot functionality to work with Jeremy's kernel after using the Xen Hypervisor?

>
>
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