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Re: [Qemu-devel] [PATCH 2/7] Convert pc cpu to qdev


From: Vasilis Liaskovitis
Subject: Re: [Qemu-devel] [PATCH 2/7] Convert pc cpu to qdev
Date: Wed, 14 Mar 2012 14:49:59 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Hi,

On Wed, Mar 14, 2012 at 09:37:18AM +0100, Igor Mammedov wrote:
> On 03/14/2012 08:59 AM, Lai Jiangshan wrote:
> >not accepted, so I don't know how to take part in.
> 
> As I see it, there is not much to do from cpu hot-plug perspective.
> It's just a matter of adaptation QOM-ified cpus for usage from
> qdev device_add, and I'm working on it.
> However, there is a lot to be done in cpu unplug area:
>   - host side: there is unaccepted patches to destroy vcpu
>     during VM-lifecycle. They are still need to be worked on:
>      "[Qemu-devel] [PATCH 0] A series patches for kvm&qemu to enable vcpu 
> destruction in kvm"
>   - linux guest side: kernel can receive ACPI request to unplug cpu,
>     but does nothing with it (last time I've tested it with 3.2 kernel),
>     You might wish to look at following mail threads:
>       https://lkml.org/lkml/2011/9/30/18
>       http://lists.gnu.org/archive/html/qemu-devel/2011-10/msg02254.html

I also plan to resubmit the qemu-side of ACPI cpu unplug request:
http://lists.nongnu.org/archive/html/qemu-devel/2012-01/msg03037.html
so that they work independently of the "host side" patches mentioned above. 

It would be great for the QOMify/hotplug/icc patches to be accepted soon,
since this would make unplug testing/development more straightoward.

thanks,

- Vasilis



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