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[Qemu-devel] [PATCH v4 0/5] Allow hotplug of s390 CPUs
From: |
Matthew Rosato |
Subject: |
[Qemu-devel] [PATCH v4 0/5] Allow hotplug of s390 CPUs |
Date: |
Wed, 17 Feb 2016 15:12:30 -0500 |
Changes from v3-v4:
* Drop patches related to device_add / device_del
* Add patch to enable cpu_add for s390x.
**************
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 (5):
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 functions to register CPU state
s390x/cpu: Allow hotplug of CPUs
hw/s390x/s390-virtio-ccw.c | 3 ++-
hw/s390x/s390-virtio.c | 55 +++++++++++++++++++++++++++-----------
hw/s390x/s390-virtio.h | 2 +-
target-s390x/cpu.c | 66 +++++++++++++++++++++++++++++++++++++++++++---
target-s390x/cpu.h | 2 ++
5 files changed, 107 insertions(+), 21 deletions(-)
--
1.9.1
- [Qemu-devel] [PATCH v4 0/5] Allow hotplug of s390 CPUs,
Matthew Rosato <=
- [Qemu-devel] [PATCH v4 3/5] s390x/cpu: Move some CPU initialization into realize, Matthew Rosato, 2016/02/17
- [Qemu-devel] [PATCH v4 2/5] s390x/cpu: Set initial CPU state in common routine, Matthew Rosato, 2016/02/17
- [Qemu-devel] [PATCH v4 4/5] s390x/cpu: Add functions to register CPU state, Matthew Rosato, 2016/02/17
- [Qemu-devel] [PATCH v4 1/5] s390x/cpu: Cleanup init in preparation for hotplug, Matthew Rosato, 2016/02/17
- [Qemu-devel] [PATCH v4 5/5] s390x/cpu: Allow hotplug of CPUs, Matthew Rosato, 2016/02/17