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

[Astarta <astarta@xxxxxx>]

On 10/18/2013 03:06 PM, Paul Durrant wrote:
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> > bounces@xxxxxxxxxxxxx] On Behalf Of Ian Campbell
> > Sent: 18 October 2013 10:46
> > To: David Vrabel
> > Cc: xen-devel@xxxxxxxxxxxxx; Astarta; Stefano Stabellini
> > Subject: Re: [Xen-devel] [BUG] Xen vm kernel crash in get_free_entries.
> >
> > 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?
> device_id will be 2 only if you use a windows template - which you generally 
> should not for hvm linux as that also has viridian=true.
>
>    Paul
You're right. The problem VMs are running Windows OS (Win2008 R2 and 
Windows 2012), Linux here is a kind of Live CD from where these VMs are 
backuped.
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