Xen devel - Nov 2013 - Is e820_host option available in xen 4.1.3 xl and how do I use it?

Hi xen devel''s

I am passing through some Infiniband HBA Virtual Functions and
unfortunately when the memory for the guest is increased beyond 2GB they
fail to initialize.

[    2.481040] mlx4_core: Mellanox ConnectX core driver v1.0 (July 14, 2011)
[    2.481044] mlx4_core: Initializing 0000:00:00.3
[    2.481127] mlx4_core 0000:00:00.3: device not available (can''t
reserve
[mem 0xbf000000-0xbf7fffff 64bit pref])
[    2.481140] mlx4_core 0000:00:00.3: Cannot enable PCI device, aborting.
[    2.484019] mlx4_core: probe of 0000:00:00.3 failed with error -22


Do I need to set the e820_host=1 option?
When I tried it, it fails to do anything significant.

Does this functionality exist in xen 4.1.3?  Am I setting it correctly?

The top part of my guest config contains:


#
#  Kernel + memory size
#

# Pass through the infiniband
e820_host=1
pci = [''06:00.1'']

extra="iommu=soft"

bootloader = ''/usr/lib/xen-default/bin/pygrub''

vcpus       = ''4''
memory      = ''8192''
maxmem      = ''8192''
...


Using xm fails altogether although I did see a patch posted last year.
http://lists.xen.org/archives/html/xen-users/2012-08/msg00150.html

Regards,  Matthew


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On Thu, 2013-11-28 at 13:22 +1300, Matthew Hook wrote:
> Does this functionality exist in xen 4.1.3?
It''s not mentioned in the 4.1.3 copy of the manpage and:
$ git grep e820_host RELEASE-4.1.3
$

So no, I think it is not included.

Ian.