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Re: [Qemu-devel] [PATCH v3 00/10] Allow hotplug of s390 CPUs
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] [PATCH v3 00/10] Allow hotplug of s390 CPUs |
Date: |
Mon, 1 Feb 2016 09:52:54 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
On 01/27/2016 05:53 PM, Matthew Rosato wrote:
> Changes from v2->v3:
>
> * Call cpu_remove_sync rather than cpu_remove().
> * Pull latest version of patches from pseries set (v6). Trivial change to
> "Reclaim VCPU objects" to fix checkpatch error.
> * Add object_unparent during s390_cpu_release to accomodate changes in
> Patch 4 "Reclaim VCPU objects."
> * Remove a cleanup patch in favor of 2 patches from pseries set.
>
> **************
>
> The following patchset enables hotplug of s390 CPUs.
>
> The standard interface is used -- to configure a guest with 2 CPUs online at
> boot and 4 maximum:
>
> qemu -smp 2,maxcpus=4
>
> To subsequently hotplug a CPU:
>
> Issue 'device_add s390-cpu,id=<id>' from monitor.
>
> 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.
>
> Hot unplug support is provided via 'device_del <id>', however s390 does not
> have
> a mechanism for gracefully handling a CPU that has been removed, so this event
> triggers a reset of the guest in order to force recognition.
>
> This patch set is based on work previously done by Jason Herne.
>
> Bharata B Rao (3):
> exec: Remove cpu from cpus list during cpu_exec_exit()
> exec: Do vmstate unregistration from cpu_exec_exit()
> cpu: Add a sync version of cpu_remove()
>
> Gu Zheng (1):
> cpu: Reclaim vCPU objects
>
> 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 functions to (un)register CPU state
> s390/virtio-ccw: Add hotplug handler and prepare for unplug
> s390x/cpu: Allow hot plug/unplug of CPUs
>
> cpus.c | 50 +++++++++++++++++++++++++++++++++
> exec.c | 30 ++++++++++++++++++++
> hw/s390x/s390-virtio-ccw.c | 30 +++++++++++++++++++-
> hw/s390x/s390-virtio.c | 64 +++++++++++++++++++++++++++++++-----------
> hw/s390x/s390-virtio.h | 2 +-
> include/qom/cpu.h | 18 ++++++++++++
> include/sysemu/kvm.h | 1 +
> kvm-all.c | 57 ++++++++++++++++++++++++++++++++++++-
> kvm-stub.c | 5 ++++
> target-s390x/cpu.c | 70
> +++++++++++++++++++++++++++++++++++++++++++---
> target-s390x/cpu.h | 4 +++
> 11 files changed, 308 insertions(+), 23 deletions(-)
Acked-by: Christian Borntraeger <address@hidden>
Alexander, if you are too busy at the moment, we could carry
these patches via the s390/kvm tree?
We want these patches merged, since we have to libvirt as well to
use device_add instead of cpu_add (sigh).
Christian
- Re: [Qemu-devel] [PATCH v3 00/10] Allow hotplug of s390 CPUs,
Christian Borntraeger <=