[Xen-devel] Error expanding grant table frames

["Phil Winterfield (winterfi)" <winterfi@xxxxxxxxx>]

When I start up a 32-bit PV guest with a pair of passthrough NIC ports, I am seeing the following error:

 

(XEN) grant_table.c:1121:d1 Expanding dom (1) grant table from (4) to (16) frames.

(XEN) mm.c:883:d1 Error getting mfn 212ef (pfn 1d210) from L1 entry 00000000212ef023 for l1e_owner=1, pg_owner=1

(XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)

 

I am running the 64-bit linux-2.6.32.17 pvops kernel for dom0 along with xen-unstable c/s 22068.  This problem has been around for quite a long time and was fixed in the OpenSuse11.1 release which had the linux-2.6.27 kernel for dom0 paired with xen-3.4.  In all of the subsequent releases that I have tried, the problem has returned.  A few searches have shown that the problem has been observed by others, usually when running 32-bit guests with passthrough NICs.  In some instances the error was observed when dom0 was mapping shared RX ring buffers.

 

Any ideas as to where something like this might be originating?

 

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