Re: [Qemu-devel] [RESEND PATCH v3 5/8] pc-dimm: Add pc_dimm_unrealize() for memory hot unplug support.

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 27 Aug 2014 16:08:36 +0800
Tang Chen <tangchen@cn.fujitsu.com> wrote:

> From: Hu Tao <hutao@cn.fujitsu.com>
> 
> Implement unrealize function for pc-dimm device. It delete subregion from
s/delete/removes/

> hotplug region, and delete ram address range from guest ram list.
> 
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
> ---
>  hw/mem/pc-dimm.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
> index 20fe0dc..34109a2 100644
> --- a/hw/mem/pc-dimm.c
> +++ b/hw/mem/pc-dimm.c
> @@ -270,12 +270,22 @@ static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)
>      return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
>  }
>  
> +static void pc_dimm_unrealize(DeviceState *dev, Error **errp)
> +{
> +    PCDIMMDevice *dimm = PC_DIMM(dev);
> +    MemoryRegion *mr = pc_dimm_get_memory_region(dimm);
> +
> +    memory_region_del_subregion(mr->container, mr);
usually MemoryRegion is treated as opaque and it's fields
accessed via memory_region_foo() helpers.

> +    vmstate_unregister_ram(mr, dev);
these 2 lines look like a job for PCMachine which did original mapping/vmstate registration

> +}
> +
>  static void pc_dimm_class_init(ObjectClass *oc, void *data)
>  {
>      DeviceClass *dc = DEVICE_CLASS(oc);
>      PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
>  
>      dc->realize = pc_dimm_realize;
> +    dc->unrealize = pc_dimm_unrealize;
>      dc->props = pc_dimm_properties;
>  
>      ddc->get_memory_region = pc_dimm_get_memory_region;