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[Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs
From: |
Matthew Rosato |
Subject: |
[Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs |
Date: |
Fri, 4 Mar 2016 12:34:28 -0500 |
Changes from v8->v9:
* Patch 4: fix bug introduced during split, only init smp_cpus (David)
* Patch 6:
* nit change to error_propagate handling in realizefn (David)
* scc->next_cpu_id++ (David)
* s/s390_cpu_set_id/s390x_cpu_set_id/ (David)
* s/s390_new_cpu/s390x_new_cpu/ (David)
* Put id getter back in (David)
* Move linux-user next_cpu_id into s390_cpux_init (David)
* Patch 7: nit change to error_propagate handling (David)
**************
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 (7):
s390x/cpu: Cleanup init in preparation for hotplug
s390x/cpu: Set initial CPU state in common routine
s390x/cpu: Get rid of side effects when creating a vcpu
s390x/cpu: Tolerate max_cpus
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 | 46 +++++++++++++++++++++-
hw/s390x/s390-virtio.c | 36 +++++++++--------
hw/s390x/s390-virtio.h | 2 +-
target-s390x/cpu-qom.h | 3 ++
target-s390x/cpu.c | 96 +++++++++++++++++++++++++++++++++++++++++++---
target-s390x/cpu.h | 2 +
target-s390x/helper.c | 41 +++++++++++++++++++-
7 files changed, 200 insertions(+), 26 deletions(-)
--
1.9.1
- [Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs,
Matthew Rosato <=
- [Qemu-devel] [PATCH v9 1/7] s390x/cpu: Cleanup init in preparation for hotplug, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 2/7] s390x/cpu: Set initial CPU state in common routine, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 3/7] s390x/cpu: Get rid of side effects when creating a vcpu, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 4/7] s390x/cpu: Tolerate max_cpus, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 6/7] s390x/cpu: Add error handling to cpu creation, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 5/7] s390x/cpu: Add CPU property links, Matthew Rosato, 2016/03/04
- [Qemu-devel] [PATCH v9 7/7] s390x/cpu: Allow hotplug of CPUs, Matthew Rosato, 2016/03/04
- Re: [Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs, Christian Borntraeger, 2016/03/07