Re: [Qemu-devel] [RESEND PATCH v4 4/6] acpi, mem-hotplug: Add unplug cb for memory device

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 16 Mar 2015 16:58:16 +0800
Zhu Guihua <zhugh.fnst@cn.fujitsu.com> wrote:

> From: Tang Chen <tangchen@cn.fujitsu.com>
> 
> This patch adds unplug cb for memory device. It resets some memory status
> in acpi_memory_unplug_cb().
'some' is quite vague. Pls, explain what it does in commit message.

[...]
> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> index f716e91..781ad33 100644
> --- a/hw/acpi/piix4.c
> +++ b/hw/acpi/piix4.c
> @@ -377,8 +377,14 @@ static void piix4_device_unplug_request_cb(HotplugHandler *hotplug_dev,
>  static void piix4_device_unplug_cb(HotplugHandler *hotplug_dev,
>                                     DeviceState *dev, Error **errp)
>  {
> -    error_setg(errp, "acpi: device unplug for not supported device"
> -               " type: %s", object_get_typename(OBJECT(dev)));
> +    PIIX4PMState *s = PIIX4_PM(hotplug_dev);
> +
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
missing condition "pm->acpi_memory_hotplug.is_enabled &&"?

> +        acpi_memory_unplug_cb(&s->acpi_memory_hotplug, dev, errp);
> +    } else {
> +        error_setg(errp, "acpi: device unplug for not supported device"
> +                   " type: %s", object_get_typename(OBJECT(dev)));
> +    }
>  }
>  
>  static void piix4_update_bus_hotplug(PCIBus *pci_bus, void *opaque)
> diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
> index c437a85..15deae0 100644
> --- a/include/hw/acpi/memory_hotplug.h
> +++ b/include/hw/acpi/memory_hotplug.h
> @@ -32,6 +32,8 @@ void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
>  void acpi_memory_unplug_request_cb(ACPIREGS *ar, qemu_irq irq,
>                                     MemHotplugState *mem_st,
>                                     DeviceState *dev, Error **errp);
> +void acpi_memory_unplug_cb(MemHotplugState *mem_st,
> +                           DeviceState *dev, Error **errp);
>  
>  extern const VMStateDescription vmstate_memory_hotplug;
>  #define VMSTATE_MEMORY_HOTPLUG(memhp, state) \