Re: [Xen-devel] [BUG] Xen vm kernel crash in get_free_entries.

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of Astarta
> Sent: 18 October 2013 11:32
> To: Ian Campbell; David Vrabel
> Cc: xen-devel@xxxxxxxxxxxxx; Stefano Stabellini
> Subject: Re: [Xen-devel] [BUG] Xen vm kernel crash in get_free_entries.
> 
> On 10/18/2013 01:46 PM, Ian Campbell wrote:
> > On Fri, 2013-10-18 at 10:31 +0100, David Vrabel wrote:
> >
> >> I suspect some of the changes for ARM has caused this (because ARM is
> >> sort of PVHVM without a platform PCI device) but I had a quick look and
> >> couldn't spot anything.  Stefano, any ideas?
> > If there is no platform device then we should never be going anywhere
> > near any of the grant table code...
> >
> >  From the log in the original post it looks like at least some parts of
> > the kernel think it is running PVHVM (i.e. it does the unplug and says
> > "Booting paravirtualized kernel on Xen HVM"). I don't think this should
> > not be the case if there is no platform pci device.
> >
> > Could this be because XenServer uses this platform_device=2 thing, which
> > is enough to trigger some of the early setup (because the unplug
> > protocol is present on I/O ports 0x10) but then the PCI driver in Linux
> > doesn't know about this ID and so never initialises the rest of it?
> >
> > Astarta, which of these configurations have you tried:
> >
> >   - No platform device at all
> >   - Platform device with ID == 1
> >   - Platform device with ID == 2
> >
> > and what happened with each?
> >
> > Ian.
> >
> 
> Hello Ian,
> 
> 3.11.5 kernel boots OK if platform:device_id=0001 (see attached
> vm_boot_log_id1.txt and VM config vm_cfg_id1.txt)
> 3.11.5 kernel crashes if platform:device_id=0002 (see
> vm_boot_log_id2.txt mv_cfg_id2.txt).
> 
> Sorry, but I really dont know and cannot find in google how to test w/o
> platform:device_id at all. My system doesnt have xl.cfg in /etc/xen/ and
> I use xe utility to change parameters.
> I've tried not to specify platform:device_id leaving it empty (i.e. xe
> vm-param-set uuid=<VM UUID> platform:device_id= ). Kernel crashes. see
> vm_boot_log_id_empty.txt and vm_cfg_id_empty.txt ).
> 

If you don't specify device_id in your platform parameters then XenServer QEMU 
will default to the standard value of 1, so it will be the same as upstream

  Paul

> 
> Let me know if there's anything else I can do to shed some light to the
> problem.
> 
> --
> Marina
> 

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