[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v7 0/6] Allow hotplug of s390 CPUs
From: |
Matthew Rosato |
Subject: |
[Qemu-devel] [PATCH v7 0/6] Allow hotplug of s390 CPUs |
Date: |
Tue, 1 Mar 2016 16:13:20 -0500 |
Changes from v6->v7:
* Patch 1 - Cannot move cpu_model default setting to machine instance_init,
as vl.c can overwrite it again with a NULL during startup. Left check
in s390_init_cpus.
* Drop cpu_last patch (Andreas)
* Patch 4 - merged with patch that adds hotplug handler / set cpu property.
* New patch 5 - Add cpu_s390x_create and s390_new_cpu to allow for error
handling during cpu creation (Andreas). Re-add mechanism for tracking next
cpu ID. Encapsulate IDs as a CPU property & perform checking (David) --
I used x86 apic_id as a template.
* Patch 6 - Add error handling to s390_hot_add_cpu via s390_new_cpu. (Andreas)
**************
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
s390x/cpu: Add error handling to cpu creation
s390x/cpu: Allow hotplug of CPUs
hw/s390x/s390-virtio-ccw.c | 78 +++++++++++++++++++++++++++++++++++++++++++-
hw/s390x/s390-virtio.c | 36 +++++++++++----------
hw/s390x/s390-virtio.h | 3 +-
target-s390x/cpu-qom.h | 3 ++
target-s390x/cpu.c | 80 +++++++++++++++++++++++++++++++++++++++++++---
target-s390x/cpu.h | 1 +
target-s390x/helper.c | 31 ++++++++++++++++--
7 files changed, 208 insertions(+), 24 deletions(-)
--
1.9.1
- [Qemu-devel] [PATCH v7 0/6] Allow hotplug of s390 CPUs,
Matthew Rosato <=
- [Qemu-devel] [PATCH v7 1/6] s390x/cpu: Cleanup init in preparation for hotplug, Matthew Rosato, 2016/03/01
- [Qemu-devel] [PATCH v7 4/6] s390x/cpu: Add CPU property links, Matthew Rosato, 2016/03/01
- [Qemu-devel] [PATCH v7 2/6] s390x/cpu: Set initial CPU state in common routine, Matthew Rosato, 2016/03/01
- [Qemu-devel] [PATCH v7 6/6] s390x/cpu: Allow hotplug of CPUs, Matthew Rosato, 2016/03/01
- [Qemu-devel] [PATCH v7 5/6] s390x/cpu: Add error handling to cpu creation, Matthew Rosato, 2016/03/01