From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:47110)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1XXVER-0001QO-Qs
	for qemu-devel@nongnu.org; Fri, 26 Sep 2014 09:06:48 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1XXVEL-0007jG-VG
	for qemu-devel@nongnu.org; Fri, 26 Sep 2014 09:06:43 -0400
Received: from mx1.redhat.com ([209.132.183.28]:40350)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1XXVEL-0007iG-MP
	for qemu-devel@nongnu.org; Fri, 26 Sep 2014 09:06:37 -0400
Date: Fri, 26 Sep 2014 15:06:23 +0200
From: Igor Mammedov <imammedo@redhat.com>
Message-ID: <20140926150623.2e533405@nial.usersys.redhat.com>
In-Reply-To: <1410917043-16334-5-git-send-email-guz.fnst@cn.fujitsu.com>
References: <1410917043-16334-1-git-send-email-guz.fnst@cn.fujitsu.com>
	<1410917043-16334-5-git-send-email-guz.fnst@cn.fujitsu.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH V3 4/7] pc: add cpu hotplug handler to
 PC_MACHINE
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: chen.fan.fnst@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, tangchen@cn.fujitsu.com, qemu-devel@nongnu.org, afaerber@suse.de

On Wed, 17 Sep 2014 09:24:00 +0800
Gu Zheng <guz.fnst@cn.fujitsu.com> wrote:

> Add cpu hotplug handler to PC_MACHINE, which will perform the acpi
> cpu hotplug callback via hotplug_handler API.
> 
> v3:
>  -deal with start up cpus in a more neat way as Igor suggested.
> v2:
>  -just rebase.
> 
> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
> ---
>  hw/i386/pc.c |   26 +++++++++++++++++++++++++-
>  1 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index b6c9b61..e25e71b 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1613,11 +1613,34 @@ out:
>      error_propagate(errp, local_err);
>  }
>  
> +static void pc_cpu_plug(HotplugHandler *hotplug_dev,
> +                        DeviceState *dev, Error **errp)
> +{
> +    HotplugHandlerClass *hhc;
> +    Error *local_err = NULL;
> +    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
> +
> +    if (!pcms->acpi_dev) {
> +        if (dev->hotplugged) {
> +            error_setg(&local_err,
> +                       "cpu hotplug is not enabled: missing acpi device");
> +        }
> +        goto out;
> +    }
> +
> +    hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
> +    hhc->plug(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
above call this would rise SCI unconditionally whether CPU is hotplugged or not.
perhaps checking for this in acpi_cpu_plug_cb() and rising IRQ only for hotplugged
CPUs would be better.

> +out:
> +    error_propagate(errp, local_err);
> +}
> +
>  static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
>                                        DeviceState *dev, Error **errp)
>  {
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
>          pc_dimm_plug(hotplug_dev, dev, errp);
> +    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> +        pc_cpu_plug(hotplug_dev, dev, errp);
>      }
>  }
>  
> @@ -1626,7 +1649,8 @@ static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
>  {
>      PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(machine);
>  
> -    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
> +        object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
>          return HOTPLUG_HANDLER(machine);
>      }
>