Re: [PATCH 5/5] hw/i386: expose a "smbios_ep" PC machine property

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 9/8/20 6:54 PM, Daniel P. Berrangé wrote:
> The i440fx and Q35 machine types are both hardcoded to use the legacy
> SMBIOS 2.1 entry point. This is a sensible conservative choice because
> SeaBIOS only supports SMBIOS 2.1
> 
> EDK2, however, can also support SMBIOS 3.0 and QEMU already uses this on
> the ARM virt machine type.
> 
> This adds a property to allow the choice of SMBIOS entry point versions
> For example to opt in to version 3.0
> 
>    $QEMU -machine q35,smbios_ep=3_0
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> ---
>  hw/i386/pc.c         | 26 ++++++++++++++++++++++++++
>  hw/i386/pc_piix.c    |  2 +-
>  hw/i386/pc_q35.c     |  2 +-
>  include/hw/i386/pc.h |  3 +++
>  4 files changed, 31 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index d11daacc23..cfce279eed 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -81,6 +81,7 @@
>  #include "hw/mem/nvdimm.h"
>  #include "qapi/error.h"
>  #include "qapi/qapi-visit-common.h"
> +#include "qapi/qapi-visit-machine.h"
>  #include "qapi/visitor.h"
>  #include "hw/core/cpu.h"
>  #include "hw/usb.h"
> @@ -1834,6 +1835,23 @@ static void pc_machine_set_pit(Object *obj, bool value, Error **errp)
>      pcms->pit_enabled = value;
>  }
>  
> +static void pc_machine_get_smbios_ep(Object *obj, Visitor *v, const char *name,
> +                                     void *opaque, Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +    SmbiosEntryPointType smbios_ep = pcms->smbios_ep;
> +
> +    visit_type_SmbiosEntryPointType(v, name, &smbios_ep, errp);
> +}
> +
> +static void pc_machine_set_smbios_ep(Object *obj, Visitor *v, const char *name,
> +                                     void *opaque, Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +
> +    visit_type_SmbiosEntryPointType(v, name, &pcms->smbios_ep, errp);
> +}
> +
>  static void pc_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
>                                              const char *name, void *opaque,
>                                              Error **errp)
> @@ -1879,6 +1897,8 @@ static void pc_machine_initfn(Object *obj)
>      pcms->vmport = ON_OFF_AUTO_OFF;
>  #endif /* CONFIG_VMPORT */
>      pcms->max_ram_below_4g = 0; /* use default */
> +    pcms->smbios_ep = SMBIOS_ENTRY_POINT_TYPE_2_1;
> +
>      /* acpi build is enabled by default if machine supports it */
>      pcms->acpi_build_enabled = PC_MACHINE_GET_CLASS(pcms)->has_acpi_build;
>      pcms->smbus_enabled = true;
> @@ -2004,6 +2024,12 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
>  
>      object_class_property_add_bool(oc, PC_MACHINE_PIT,
>          pc_machine_get_pit, pc_machine_set_pit);
> +
> +    object_class_property_add(oc, PC_MACHINE_SMBIOS_EP, "str",
> +        pc_machine_get_smbios_ep, pc_machine_set_smbios_ep,
> +        NULL, NULL);
> +    object_class_property_set_description(oc, PC_MACHINE_SMBIOS_EP,
> +        "SMBIOS Entry Point version [v2_1, v3_0]");
>  }
>  
>  static const TypeInfo pc_machine_info = {
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 1c5bc6ae6e..3626e5425f 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -179,7 +179,7 @@ static void pc_init1(MachineState *machine,
>          smbios_set_defaults("QEMU", "Standard PC (i440FX + PIIX, 1996)",
>                              mc->name, pcmc->smbios_legacy_mode,
>                              pcmc->smbios_uuid_encoded,
> -                            SMBIOS_ENTRY_POINT_TYPE_2_1);
> +                            pcms->smbios_ep);
>      }
>  
>      /* allocate ram and load rom/bios */
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index cc202407c7..7cf08fa364 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -204,7 +204,7 @@ static void pc_q35_init(MachineState *machine)
>          smbios_set_defaults("QEMU", "Standard PC (Q35 + ICH9, 2009)",
>                              mc->name, pcmc->smbios_legacy_mode,
>                              pcmc->smbios_uuid_encoded,
> -                            SMBIOS_ENTRY_POINT_TYPE_2_1);
> +                            pcms->smbios_ep);
>      }
>  
>      /* allocate ram and load rom/bios */
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index fe52e165b2..f5d2ebcb49 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -10,6 +10,7 @@
>  
>  #include "hw/acpi/acpi_dev_interface.h"
>  #include "hw/hotplug.h"
> +#include "hw/firmware/smbios.h"
>  
>  #define HPET_INTCAP "hpet-intcap"
>  
> @@ -38,6 +39,7 @@ struct PCMachineState {
>      /* Configuration options: */
>      uint64_t max_ram_below_4g;
>      OnOffAuto vmport;
> +    SmbiosEntryPointType smbios_ep;
>  
>      bool acpi_build_enabled;
>      bool smbus_enabled;
> @@ -59,6 +61,7 @@ struct PCMachineState {
>  #define PC_MACHINE_SMBUS            "smbus"
>  #define PC_MACHINE_SATA             "sata"
>  #define PC_MACHINE_PIT              "pit"
> +#define PC_MACHINE_SMBIOS_EP        "smbios-ep"
>  
>  /**
>   * PCMachineClass:
>