Cc'ing Laurent because I needed to incorporate the "spapr: manage hotplugged
devices while the VM is not started" patch in this series to be able to
verify that the "CPU core unplug" part of patch 3 behaves as expected.
With this series, I could successfully do the following on POWER8 host with
full cores:
1) start a pseries-2.9 machine with QEMU 2.9:
-smp cores=1,threads=2,maxcpus=8
2) hotplug a core:
device_add host-spapr-cpu-core,core-id=4,id=core4
3) migrate to QEMU 2.10 with core4 added (ie, started with same -smp as in
step 1 and same device_add as step 2):
4) hotplug another core:
device_add host-spapr-cpu-core,core-id=2,id=core2
5) migrate back to QEMU 2.9 with core4 and core2 added
6) hotplug the core in the last available slot:
device_add host-spapr-cpu-core,core-id=6,id=core6
7) migrate to QEMU 2.10 with core4, core2 and core6 added
The following step requires Laurent's patch, otherwise the guest complains
about the non-existing DRC and fails to unplug the cores.
8) unplug some cores:
device_del core4
device_del core2
9) migrate back to QEMU 2.9 with core6 added
v5: - some patches from v4 got merged
- rebased and added Laurent's change to manage hotplugging of CPU
on the destination host (patch 1)
- see individual changelog for patches 2 and 3
v4: - some patches from v3 got merged
- added some more preparatory cleanup in xics (patches 1,2)
- merge cpu_setup() handler into realize() (patch 4)
- see individual changelog for patches 3 and 6
v3: - preparatory cleanup in pnv (patch 1)
- rework ICPState realization and vmstate registration (patches 2,3,4)
- fix migration using dummy icp/server entries (patch 5)
v2: - some patches from v1 are already merged in ppc-for-2.10
- added a new fix to a potential memory leak (patch 1)
- consolidate dt_id computation (patch 3)
- see individual changelogs for patch 2 and 4
Cheers.
--
Greg
---
Greg Kurz (2):
xics: directly register ICPState objects to vmstate
spapr: fix migration of ICPState objects from/to older QEMU
Laurent Vivier (1):
spapr: manage hotplugged devices while the VM is not started
hw/intc/xics.c | 5 ++
hw/ppc/spapr.c | 107 ++++++++++++++++++++++++++++++++++++++++++++----
include/hw/ppc/spapr.h | 1
3 files changed, 104 insertions(+), 9 deletions(-)
