Re: [Xen-devel] [Qemu-devel] [PATCH v5 13/24] hw: acpi: Do not create hotplug method when handler is not defined

[Igor Mammedov <imammedo@xxxxxxxxxx>]

On Mon,  5 Nov 2018 02:40:36 +0100
Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> wrote:

> CPU and memory ACPI hotplug are not necessarily handled through SCI
> events. For example, with Hardware-reduced ACPI, the GED device will
> manage ACPI hotplug entirely.
> As a consequence, we make the CPU and memory specific events AML
> generation optional. The code will only be added when the method name is
> not NULL.
patch doesn't belong to this series, it should be go along with
GED device patch.

Suggest to drop it for now.

> 
> Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> Tested-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
> Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
> ---
>  hw/acpi/cpu.c            |  8 +++++---
>  hw/acpi/memory_hotplug.c | 11 +++++++----
>  2 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
> index f10b190019..cd41377b5a 100644
> --- a/hw/acpi/cpu.c
> +++ b/hw/acpi/cpu.c
> @@ -569,9 +569,11 @@ void build_cpus_aml(Aml *table, MachineState *machine, 
> CPUHotplugFeatures opts,
>      aml_append(sb_scope, cpus_dev);
>      aml_append(table, sb_scope);
>  
> -    method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
> -    aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
> -    aml_append(table, method);
> +    if (event_handler_method) {
> +        method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
> +        aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
> +        aml_append(table, method);
> +    }
>  
>      g_free(cphp_res_path);
>  }
> diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
> index 8c7c1013f3..db2c4df961 100644
> --- a/hw/acpi/memory_hotplug.c
> +++ b/hw/acpi/memory_hotplug.c
> @@ -715,10 +715,13 @@ void build_memory_hotplug_aml(Aml *table, uint32_t 
> nr_mem,
>      }
>      aml_append(table, dev_container);
>  
> -    method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
> -    aml_append(method,
> -        aml_call0(MEMORY_DEVICES_CONTAINER "." MEMORY_SLOT_SCAN_METHOD));
> -    aml_append(table, method);
> +    if (event_handler_method) {
> +        method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
> +        aml_append(method,
> +                   aml_call0(MEMORY_DEVICES_CONTAINER "."
> +                             MEMORY_SLOT_SCAN_METHOD));
> +        aml_append(table, method);
> +    }
>  
>      g_free(mhp_res_path);
>  }


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