Re: [Qemu-devel] [PATCH v3 for-1.7] rdma: rename 'x-rdma' => 'rdma'

[Eric Blake <eblake@redhat.com>]

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On 11/15/2013 10:40 AM, Michael R. Hines wrote:
> 
> This is unrelated to RDMA - accessing the /dev/infiniband
> device nodes is already supported by libvirt my modifying
> the configuration file in /etc and that works just fine.

http://wiki.qemu.org/Features/RDMALiveMigration states that you modify
the .conf file to expose /dev/infiniband/rdma_cm and friends.  Are all
of these devices read/write accessible to non-root?  Or is there going
to be a problem if using user="qemu" group="qemu"?  (That is, merely
exposing the devices through cgroup device ACL checking may be
insufficient if you can't access the devices when not running root/root).

Libvirt can be patched so that the .conf file does not have to be edited
(ie. change the defaults so that if cgroup_device_acl is not present in
the conf file, the defaults could still let a domainaccess the
/dev/infiniband devices).

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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