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[Qemu-devel] [PATCH v5 0/6] Allow hotplug of s390 CPUs
From: |
Matthew Rosato |
Subject: |
[Qemu-devel] [PATCH v5 0/6] Allow hotplug of s390 CPUs |
Date: |
Thu, 18 Feb 2016 23:03:31 -0500 |
Changes from v4->v5:
* Patch #3 - Drop static next_cpu_id (Igor)
* Patch #4 - Drop register_cpustate in favor of machine hotplug handler.
Re-write commit message as a result. (Igor)
* Patch #5 - Revive hotplug handler code from previous patch set. Use
plug callback to update property links instead of register_cpustate. (Igor)
* Patch #6 - Use last_cpu instead of next_cpu_id to sanity-check hotplugged
CPU id (Igor)
**************
As discussed in the KVM call, we will go ahead with cpu_add for
s390x to get cpu hotplug functionality in s390x now, until
architectures that require a more robust hotplug interface
settle on a design.
To configure a guest with 2 CPUs online at
boot and 4 maximum:
qemu -smp 2,maxcpus=4
Or, when using libvirt:
<domain>
...
<vcpu current="2">4</vcpu>
...
</domain>
To subsequently hotplug a CPU:
Issue 'cpu-add <id>' from qemu monitor, or use virsh setvcpus --count <n>
<domain>, where <n> is the total number of desired guest CPUs.
At this point, the guest must bring the CPU online for use -- This can be
achieved via "echo 1 > /sys/devices/system/cpu/cpuX/online" or via a management
tool like cpuplugd.
This patch set is based on work previously done by Jason Herne.
Matthew Rosato (6):
s390x/cpu: Cleanup init in preparation for hotplug
s390x/cpu: Set initial CPU state in common routine
s390x/cpu: Move some CPU initialization into realize
s390x/cpu: Add CPU property links
s390/virtio-ccw: Add hotplug handler
s390x/cpu: Allow hotplug of CPUs
hw/s390x/s390-virtio-ccw.c | 43 ++++++++++++++++++++++++++++++++++-
hw/s390x/s390-virtio.c | 36 ++++++++++++++++-------------
hw/s390x/s390-virtio.h | 2 +-
target-s390x/cpu.c | 56 +++++++++++++++++++++++++++++++++++++++++++---
target-s390x/cpu.h | 1 +
5 files changed, 117 insertions(+), 21 deletions(-)
--
1.9.1
- [Qemu-devel] [PATCH v5 0/6] Allow hotplug of s390 CPUs,
Matthew Rosato <=
- [Qemu-devel] [PATCH v5 1/6] s390x/cpu: Cleanup init in preparation for hotplug, Matthew Rosato, 2016/02/18
- [Qemu-devel] [PATCH v5 3/6] s390x/cpu: Move some CPU initialization into realize, Matthew Rosato, 2016/02/18
- [Qemu-devel] [PATCH v5 2/6] s390x/cpu: Set initial CPU state in common routine, Matthew Rosato, 2016/02/18
- [Qemu-devel] [PATCH v5 4/6] s390x/cpu: Add CPU property links, Matthew Rosato, 2016/02/18
- [Qemu-devel] [PATCH v5 6/6] s390x/cpu: Allow hotplug of CPUs, Matthew Rosato, 2016/02/18
- [Qemu-devel] [PATCH v5 5/6] s390/virtio-ccw: Add hotplug handler, Matthew Rosato, 2016/02/18