Re: [PATCH RFC V2 20/37] hw/acpi: Update GED _EVT method AML with cpu scan

[Gavin Shan]

On 9/26/23 20:04, Salil Mehta 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: Salil Mehta <salil.mehta@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> 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>
> ---
>   hw/acpi/generic_event_device.c | 4 ++++
>   include/hw/acpi/cpu_hotplug.h  | 2 ++
>   2 files changed, 6 insertions(+)

Reviewed-by: Gavin Shan <gshan@redhat.com>

> diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
> index b84602b238..ad252e6a91 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"
> +#define ACPI_CPU_CONTAINER "\\_SB.CPUS"
>   
>   typedef struct AcpiCpuHotplug {
>       Object *device;