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[libvirt] [PATCH 0/4] libxl: implement some chuncks of the NUMA interface

Hi Jim, Everyone,

First patch series, so maybe a small introduction is required: I'm Dario and I
work for Citrix on improving the NUMA support of Xen.

This patch series implements some of the missing bits and pieces, in the libxl
driver, regarding obtaining per-host and per-domain NUMA related information.
It's not the full libvirt NUMA interface, since we don't have all we would need
for that in Xen yet (we will in the next version, 4.4), but it's certainly
better than having nothing! :-)

Basically, I'm enhancing capability reporting, to cover NUMA topology (patch
01), and I'm implementing  nodeGetCellsFreeMemory (patch 02) and
virDomainGetNumaParameters (patch 04) for the libxl driver. This last one
requires at least Xen 4.3, so I put the implementation within the proper

What I'm really not sure about is patch 03, which is something I need if I want
patch 04 to function properly. Basically it is about advertising that the libxl
driver supports VIR_TYPED_PARAM_STRING. I looked at how that is done in the
qemu driver, but I'm not entirely sure I completely understood the logic behind
it, so, please, tell me if I missed or misinterpreted anything!  In particular,
should I have added more of those "flags &= ~VIR_TYPED_PARAM_STRING_OKAY;"
statements, as it happens in the qemu driver? If yes, in which functions?

Finally, allow me to say that it was a while that I wanted start hacking a bit
on libvirt.  I'm really glad I've eventually been able to do so, and I
definitely plan to continue (with particular focus on NUMA related stuff).

Comments are of course more than welcome. :-)

Thanks and Regards,


Dario Faggioli (4):
      libxl: implement NUMA capabilities reporting
      libxl: implement per NUMA node free memory reporting
      libxl: advertise the support for VIR_TYPED_PARAM_STRING
      libxl: implement virDomainGetNumaParameters

 src/libxl/libxl_conf.c   |  128 +++++++++++++++++++++++++++++-
 src/libxl/libxl_driver.c |  199 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 326 insertions(+), 1 deletion(-)

<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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