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From: | Christian Borntraeger |
Subject: | Re: [Qemu-devel] KVM call for agenda for 2016-02-16 |
Date: | Tue, 16 Feb 2016 12:54:57 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
So my quick and dirty summary of CPU as _I_ understand it (and I only have some part time bandwidth at the moment for that) x86 has cpu hotplug. Some history qemu-kvm had cpu_set in the past qemu has cpu_add for a while now libvirt code uses cpu_add cross-platform out of the box proposal to use device_add. Currently this has the following issues that we need to discuss: - will require capability checking and dual code in libvirt (and libvirt updates) - Power has some constraints that are hard to model with just device add - David Gibson proposes a two layer interface - low level: device add cpu-package - high level - David Hildenbrand has some concerns regarding CPU models (with base model + feature on/off), as device_add needs instantiatable type - devel_del: s390 has no interface for cpu removal (Matts latest patches reset the machine just like z/VM - until we have some interface) - anything else? (cpu hotplug on ARM or MIPS?) Would be good to use todays call to have a plan how to finish things soon. (maybe even for 2.6) Christian
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