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Date: Thu, 19 Aug 2010 10:24:18 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: [PATCH] Fix bug for vcpu hotplug
References: <BC00F5384FCFC9499AF06F92E8B78A9E0B0007F9DC@shsmsx502.ccr.corp.intel.com>	<4C67D844.5060306@redhat.com>	<BC00F5384FCFC9499AF06F92E8B78A9E164C8CB831@shsmsx502.ccr.corp.intel.com>
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To: Avi Kivity <avi@redhat.com>
Cc: "Liu, Jinsong" <jinsong.liu@intel.com>, "Yang,
	Sheng" <sheng.yang@intel.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "Li, Xin" <xin.li@intel.com>

On 08/18/2010 02:33 AM, Avi Kivity wrote:
>  On 08/18/2010 10:17 AM, Liu, Jinsong wrote:
>> During test, we found qemu-kvm has a bug result in guestos shutdown 
>> when vcpu hotadd.
>> This patch is to fix the bug, allow hotplug for sysbus qdev.
>>
>> --- a/hw/qdev.c
>> +++ b/hw/qdev.c
>> @@ -108,6 +108,7 @@ DeviceState *qdev_create(BusState *bus, const 
>> char *name)
>>       if (!bus) {
>>           if (!main_system_bus) {
>>               main_system_bus = qbus_create(&system_bus_info, NULL, 
>> "main-system-bus");
>> +            main_system_bus->allow_hotplug = 1;
>>           }
>>           bus = main_system_bus;
>>       }
>
>
> Looks reasonable to me.

Not really to me.

SysBus does not support hotplugging and CPU hot plug shouldn't have 
anything to do with qdev hotplug.

Can you explain a bit more why this is needed?

Regards,

Anthony Liguori