From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [BUG] Xen vm kernel crash in get_free_entries.
Date: Wed, 16 Oct 2013 14:29:07 +0100
Message-ID: <525E94A3.90706@citrix.com>
References: <525E31F2.3020308@rat.ru>
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On 16/10/13 07:28, Astarta wrote:
> Hello,
> 
> This is a some kind of a follow up to the
> http://lists.xen.org/archives/html/xen-devel/2013-09/msg03109.html (
> Linux 3.11.1 HVM guest kernel crash when started with xl
> (get_free_entries)).
> 
> Looks like we've here the similar issue.
> 
> Xen VM with 3.8.13 kernel crashes in get_free_entries (kernel BUG at
> drivers/xen/grant-table.c:1181!), i.e in:
> BUG_ON(grefs_per_grant_frame == 0);. 3.11.5 kernel behaves in exactly
> the same way.
> 
> Whole kernel log is attached. It does not contain  any "Grant tables
> using version" message.
> 
> Seems that gnttab_request_version() has was never executed, so
> grefs_per_grant_frame was never set.
> 
> Could you please advice on this issue?

I think you're missing the platform pci device required for PVHVM.
What's your VM's xl.cfg?

David