This series is based on David's ppc-for-2.8 branch, and is also available from:
Patches 1-4 address various deficiencies in how we currently handle option
vectors via ibm,client-architecture-support. This is done here in preparation
for a new option vector bit introduced later in this series, as well as a
number of future option vector bits related to other features, but I can
break this out into a separate series if preferred.
Patches 5-8 add support for an updated event format for hotplug events,
which includes a new way to specify a range of DRCs/LMBs to hotplug/unplug
using a starting position and count, which is necessary for memory unplug.
The format for this new event format is still in draft form, but slated
for inclusion in the PAPR/LoPAPR.
Patches 9-11 add support for memory unplug using the new event format.
In addition to kernel 4.8 or later, there are a number of patches required
to enable support on the guest kernel side. I've including the minimum set
of patches in my branch here:
*powerpc/pseries: advertise Hot Plug Event support to firmware
powerpc/pseries: Implement indexed-count hotplug memory remove
powerpc/pseries: Implement indexed-count hotplug memory add
Note that there is currently an issue that arises when attempting to
offline an LMB that was onlined using a guest kernel's auto-onlining
mechanism, which can prevent full completion of memory unplug requests.
This is being investigated, but for the purposes of testing this can
be worked around currently by disabling auto-onlining in guests via:
"echo offline >/sys/devices/system/memory/auto_online_blocks"
and instead onlining the blocks manually or via udev.
docs/specs/ppc-spapr-hotplug.txt | 55 ++++++++++---
hw/ppc/Makefile.objs | 2 +-
hw/ppc/spapr.c | 237
hw/ppc/spapr_drc.c | 17 ++++
hw/ppc/spapr_events.c | 222
hw/ppc/spapr_hcall.c | 70 +++++++---------
hw/ppc/spapr_ovec.c | 244
include/hw/ppc/spapr.h | 15 +++-
include/hw/ppc/spapr_ovec.h | 67 ++++++++++++++++
9 files changed, 804 insertions(+), 125 deletions(-)