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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Oct 18, 2013 at 10:46:04AM +0100, 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?
> 

Just to clarify I didn't test with XenServer,
I was testing with upstream Xen 4.2.3, where xen_platform_pci=0 causes the 
crash..
but weirdly enough only when using xl.. with xm/xend it works OK with and 
without platform pci device.

-- Pasi


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