Re: [Qemu-devel] [PATCH] pc: memhp: do not emit inserting event for coldplugged DIMMs

[Igor Mammedov]

On Fri, 23 Oct 2015 14:55:26 +0200
Igor Mammedov <address@hidden> wrote:

> currently acpi_memory_plug_cb() sets is_inserting for
> cold- and hot-plugged DIMMs as result ASL MHPD.MSCN()
> method issues device check even for every coldplugged
> DIMM. There isn't much harm in it but if we try to
> unplug such DIMM, OSPM will issue device check
> intstead of device eject event. So OSPM won't eject
> memory module as expected and it will try to eject it
> only when another memory device is hot-(un)plugged.
> 
> As a fix do not set 'is_inserting' event and do not
> issue SCI for cold-plugged DIMMs as they are
> enumerated and activated by OSPM during guest's boot.
> 
> Signed-off-by: Igor Mammedov <address@hidden>
ping

> ---
>  hw/acpi/memory_hotplug.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
> index 2ff0d5c..ce428df 100644
> --- a/hw/acpi/memory_hotplug.c
> +++ b/hw/acpi/memory_hotplug.c
> @@ -238,10 +238,12 @@ void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, 
> MemHotplugState *mem_st,
>  
>      mdev->dimm = dev;
>      mdev->is_enabled = true;
> -    mdev->is_inserting = true;
> +    if (dev->hotplugged) {
> +        mdev->is_inserting = true;
>  
> -    /* do ACPI magic */
> -    acpi_send_gpe_event(ar, irq, ACPI_MEMORY_HOTPLUG_STATUS);
> +        /* do ACPI magic */
> +        acpi_send_gpe_event(ar, irq, ACPI_MEMORY_HOTPLUG_STATUS);
> +    }
>      return;
>  }
>