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Re: [Qemu-devel] [PATCH v5 00/22] s390x cleanups and CPU hotplug via dev
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From: |
David Hildenbrand |
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Subject: |
Re: [Qemu-devel] [PATCH v5 00/22] s390x cleanups and CPU hotplug via device_add |
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Date: |
Fri, 20 Oct 2017 17:45:21 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
On 13.09.2017 15:23, David Hildenbrand wrote:
> The first patches are a bunch of cleanups. I decided to go the
> extra mile and implement CPU hotplug via "device_add", as well as
> "query-hotpluggable-cpus".
>
> On s390x, only complete cores can be plugged. CPU hot unplug is currently
> not supported by the architecture.
>
> Support for hotplugging CPUs in random core-id order (last two patches)
> is added. We once hat a KVM bug preventing this, but the stable patch
> should now be included in relevant places - 152e9f65d66f ("KVM: s390: fix
> wrong lookup of VCPUs by array index"). Current tooling will plug them in
> sequential order anyway, so it should not hurt.
>
Just played with libvirt. It seems to automatically use the new
interface. Works great for me (including migration).
--
Thanks,
David