Re: [Qemu-devel] [PATCH v1 03/11] pc: factor out pc-dimm checks into pc_dimm_pre_plug()

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 11 Jun 2018 14:16:47 +0200
David Hildenbrand <david@redhat.com> wrote:

> We can perform these checks before the device is actually realized.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/i386/pc.c | 44 ++++++++++++++++++++++++++------------------
>  1 file changed, 26 insertions(+), 18 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index f3befe6721..85c040482e 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1674,6 +1674,29 @@ void ioapic_init_gsi(GSIState *gsi_state, const char *parent_name)
>      }
>  }
>  
> +static void pc_dimm_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> +                             Error **errp)
> +{
> +    const PCMachineState *pcms = PC_MACHINE(hotplug_dev);
> +    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
> +
> +    /*
> +     * When -no-acpi is used with Q35 machine type, no ACPI is built,
> +     * but pcms->acpi_dev is still created. Check !acpi_enabled in
> +     * addition to cover this case.
> +     */
> +    if (!pcms->acpi_dev || !acpi_enabled) {
> +        error_setg(errp,
> +                   "memory hotplug is not enabled: missing acpi device or acpi disabled");
> +        return;
> +    }
> +
> +    if (is_nvdimm && !pcms->acpi_nvdimm_state.is_enabled) {
> +        error_setg(errp, "nvdimm is not enabled: missing 'nvdimm' in '-M'");
> +        return;
> +    }
> +}
> +
>  static void pc_dimm_plug(HotplugHandler *hotplug_dev,
>                           DeviceState *dev, Error **errp)
>  {
> @@ -1696,23 +1719,6 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
>          align = memory_region_get_alignment(mr);
>      }
>  
> -    /*
> -     * When -no-acpi is used with Q35 machine type, no ACPI is built,
> -     * but pcms->acpi_dev is still created. Check !acpi_enabled in
> -     * addition to cover this case.
> -     */
> -    if (!pcms->acpi_dev || !acpi_enabled) {
> -        error_setg(&local_err,
> -                   "memory hotplug is not enabled: missing acpi device or acpi disabled");
> -        goto out;
> -    }
> -
> -    if (is_nvdimm && !pcms->acpi_nvdimm_state.is_enabled) {
> -        error_setg(&local_err,
> -                   "nvdimm is not enabled: missing 'nvdimm' in '-M'");
> -        goto out;
> -    }
> -
>      pc_dimm_memory_plug(dev, MACHINE(pcms), align, &local_err);
>      if (local_err) {
>          goto out;
> @@ -2006,7 +2012,9 @@ static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev,
>  static void pc_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
>                                            DeviceState *dev, Error **errp)
>  {
> -    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> +        pc_dimm_pre_plug(hotplug_dev, dev, errp);
> +    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
>          pc_cpu_pre_plug(hotplug_dev, dev, errp);
>      }
>  }