Re: [PATCH V2 06/10] hw/acpi: Update GED _EVT method AML with cpu scan

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Sat, 30 Sep 2023 01:19:29 +0100
Salil Mehta <salil.mehta@huawei.com> wrote:

> OSPM evaluates _EVT method to map the event. The cpu hotplug event eventually
> results in start of the cpu scan. Scan figures out the cpu and the kind of
> event(plug/unplug) and notifies it back to the guest.
> 
> The change in this patch updates the GED AML _EVT method with the call to
> \\_SB.CPUS.CSCN which will do above.
> 
> Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
One trivial suggested addition inline (dropping existing definition that this
replicates). With that tidied up

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  hw/acpi/generic_event_device.c | 4 ++++
>  include/hw/acpi/cpu_hotplug.h  | 2 ++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index d2fa1d0e4a..62d504d231 100644
> --- a/hw/acpi/generic_event_device.c
> +++ b/hw/acpi/generic_event_device.c
> @@ -108,6 +108,10 @@ void build_ged_aml(Aml *table, const char *name, HotplugHandler *hotplug_dev,
>                  aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
>                                               MEMORY_SLOT_SCAN_METHOD));
>                  break;
> +            case ACPI_GED_CPU_HOTPLUG_EVT:
> +                aml_append(if_ctx, aml_call0(ACPI_CPU_CONTAINER "."
> +                                             ACPI_CPU_SCAN_METHOD));
> +                break;
>              case ACPI_GED_PWR_DOWN_EVT:
>                  aml_append(if_ctx,
>                             aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
> diff --git a/include/hw/acpi/cpu_hotplug.h b/include/hw/acpi/cpu_hotplug.h
> index 48b291e45e..ef631750b4 100644
> --- a/include/hw/acpi/cpu_hotplug.h
> +++ b/include/hw/acpi/cpu_hotplug.h
> @@ -20,6 +20,8 @@
>  #include "hw/acpi/cpu.h"
>  
>  #define ACPI_CPU_HOTPLUG_REG_LEN 12
> +#define ACPI_CPU_SCAN_METHOD "CSCN"

This seems to already be defined in hw/acpi/cpu.c
Can we drop it from there given that file now includes this
header anyway.
 
> +#define ACPI_CPU_CONTAINER "\\_SB.CPUS"
>  
>  typedef struct AcpiCpuHotplug {
>      Object *device;