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RE: [Xen-devel] dom0 vcpu set problem

To: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] dom0 vcpu set problem
From: "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>
Date: Tue, 11 May 2010 17:12:58 +0800
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Cc: Jan, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] dom0 vcpu set problem
Yes, acpi hotplug is for hvm vcpu hotplug.

To get more xenstore refer, you can access

Attached is the tool to dump xenstore, with it, you can get info for dom0 vcpu 
add/remove, like:
xm vcpu-set 0 1

xm vcpu-set 0 2

pv vcpu hotplug code is as what Jan said.


Jan Beulich wrote:
>>>> Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> 11.05.10 08:19 >>>
>> Can anybody point me where in the code the acpi cpu hotplug gets
>> triggered to add the vcpu again to the dom0 kernel after setting the
>> xenstore! 
> No, ACPI hotplug code is not involved in pv domains' vCPU adding or
> removal. Instead, the pv kernels create a xenstore watch on their
> domain's "cpu" node, reading cpu/<id>/availability when the watch
> fires. See drivers/xen/core/cpu_hotplug.c (for the forward ported
> kernels) or drivers/xen/cpu_hotplug.c (for the pv-ops ones).
> Jan
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Attachment: dumpxenstore.sh
Description: dumpxenstore.sh

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