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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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.


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