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

[Astarta <astarta@xxxxxx>]

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 ).

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

Attachment: vm_boot_log_id1.txt
Description: Text document

Attachment: vm_boot_log_id2.txt
Description: Text document

Attachment: vm_boot_log_id_empty.txt
Description: Text document

Attachment: vm_cfg_id1.txt
Description: Text document

Attachment: vm_cfg_id2.txt
Description: Text document

Attachment: vm_cfg_id_empty.txt
Description: Text document

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