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Re: [Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs
From: |
Cornelia Huck |
Subject: |
Re: [Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs |
Date: |
Mon, 7 Mar 2016 14:14:46 +0100 |
On Fri, 4 Mar 2016 12:34:28 -0500
Matthew Rosato <address@hidden> wrote:
> 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(-)
Thanks, applied to my s390-next branch.
- [Qemu-devel] [PATCH v9 1/7] s390x/cpu: Cleanup init in preparation for hotplug, (continued)
- [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
- Re: [Qemu-devel] [PATCH v9 0/7] Allow hotplug of s390 CPUs,
Cornelia Huck <=