[SeaBIOS] Alt SeaBIOS SSDT cpu hotplug

Zheng, Shaohui shaohui.zheng at intel.com
Tue Aug 3 02:30:16 CEST 2010

In our experiences, windows 2008 datacenter is the only version to support CPU hotplug, and we did not find any official announce for other windows, so we tested windows 2008 data center only.

Thanks for Kevin pointing out it, we will try windows7 hotplug feature.

Thanks & Regards,

-----Original Message-----
From: Kevin O'Connor [mailto:kevin at koconnor.net] 
Sent: Tuesday, August 03, 2010 1:27 AM
To: Avi Kivity
Cc: Alexander Graf; Liu, Jinsong; seabios at seabios.org; kvm at vger.kernel.org; Jiang, Yunhong; Li, Xin; Zheng, Shaohui; Zhang, Jianwu; You, Yongkang
Subject: Re: Alt SeaBIOS SSDT cpu hotplug

On Mon, Aug 02, 2010 at 07:13:34PM +0300, Avi Kivity wrote:
>  On 08/02/2010 06:55 PM, Kevin O'Connor wrote:
> >On Mon, Aug 02, 2010 at 10:12:31AM +0200, Alexander Graf wrote:
> >>On 02.08.2010, at 07:49, Kevin O'Connor wrote:
> >>>On Mon, Aug 02, 2010 at 10:41:39AM +0800, Liu, Jinsong wrote:
> >>>It seems the Windows acpi interpreter is significantly different from
> >>>the Linux one.  The only guess I have is that Windows doesn't like one
> >>>of the ASL constructs even though they all look valid.  I'd try to
> >>>debug this by commenting out parts of the ASL until I narrowed down
> >>>the parts causing the problem.  Unfortunately, I don't have Windows
> >>>2008 to do this directly.
> >>>
> >>>Any other ideas?
> >>Just grab yourself a free copy of the Hyper-V server 2008:
> >>
> >>http://arstechnica.com/microsoft/news/2009/08/microsoft-hyper-v-server-2008-r2-arrives-for-free.ars
> >I downloaded and installed it, but I can't reproduce the crash.  It
> >seems like a really stripped down version of Windows, so I can't tell
> >if it actually worked or not either.
> I thought only the Datacenter edition supported cpu hotplug.

I just tried an old Win 7 Ultimate beta (build 7100) I had on my HD.
It looks like it supports cpu hotplug.  However, I don't see any
failures - it seems to work fine.  (After running "cpu_set 1 online",
the event pops up in the system event log as a UserPnP event, and the
CPU appears in the system devices list.)


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