Re: [Qemu-devel] [PATCH for-2.0] dsdt: tweak ACPI ID for hotplug resource device

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Apr 06, 2014 at 12:47:37PM +0300, Michael S. Tsirkin wrote:
> ACPI0004 seems too new:
> Windows XP complains about an unrecognized device.
> This is a regression since 1.7.
> Use PNP0A06 instead - Generic Container Device.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

ping

Just making sure we don't miss this for 2.0.

Pls apply.


> ---
> 
> Note: Igor has RFC patches to use PNP0C02 under PCI0,
> but that's not ready for 2.0.
> Igor, could you comment on whether PNP0C02 is preferable for
> some OS-es?
> 
> For PNP0A06 ACPI spec says:
>     PNP0A06
>     Generic Container Device. This device behaves exactly the same as the
>     PNP0A05 device.
>     This was originally known as Extended I/O Bus. This ID should only be
>     used for containers
>     that do not produce resources for consumption by child devices. Any
>     system resources
>     claimed by a PNP0A06 device’s _CRS object must be consumed by the
>     container itself.
> 
> PNP0C02 is not in ACPI spec. It does appear in MicroSoft legacy PNP ID
> document:
>     PNP0C02         General ID for reserving resources required by Plug and
>     Play motherboard registers. (Not specific to a particular device.)
> 
> Thoughts?
> 
>  hw/i386/acpi-dsdt-cpu-hotplug.dsl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/i386/acpi-dsdt-cpu-hotplug.dsl b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> index dee4843..34aab5a 100644
> --- a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> +++ b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> @@ -93,7 +93,7 @@ Scope(\_SB) {
>      }
>  
>      Device(CPU_HOTPLUG_RESOURCE_DEVICE) {
> -        Name(_HID, "ACPI0004")
> +        Name(_HID, EisaId("PNP0A06"))
>  
>          Name(_CRS, ResourceTemplate() {
>              IO(Decode16, CPU_STATUS_BASE, CPU_STATUS_BASE, 0, CPU_STATUS_LEN)
> -- 
> MST