Re: [PATCH v5 2/3] hw/i386/pc: Default to use SMBIOS 3.0 for newer machine models

[Igor Mammedov]

On Tue, 6 Jun 2023 21:49:38 -0500
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> wrote:

> Currently, pc-q35 and pc-i44fx machine models are default to use SMBIOS 2.8
> (32-bit entry point). Since SMBIOS 3.0 (64-bit entry point) is now fully
> supported since QEMU 7.0, default to use SMBIOS 3.0 for newer machine
> models. This is necessary to avoid the following message when launching
> a VM with large number of vcpus.
> 
>    "SMBIOS 2.1 table length 66822 exceeds 65535"
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
>  hw/i386/pc.c         | 6 +++++-
>  hw/i386/pc_piix.c    | 5 +++++
>  hw/i386/pc_q35.c     | 5 +++++
>  include/hw/i386/pc.h | 1 +
>  4 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index b720dc67b6..b5c585579a 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1765,6 +1765,8 @@ static void pc_machine_init_smbios(PCMachineState *pcms)
>          return;
>      }
>  
> +    pcms->smbios_entry_point_type = pcmc->default_smbios_ep_type;
> +
>      /* These values are guest ABI, do not change */
>      smbios_set_defaults("QEMU", mc->desc,
>                          mc->name, pcmc->smbios_legacy_mode,
> @@ -1786,11 +1788,12 @@ static void pc_machine_set_smbios_ep(Object *obj, 
> Visitor *v, const char *name,
>  {
>      SmbiosEntryPointType ep_type;
>      PCMachineState *pcms = PC_MACHINE(obj);
> +    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
>  
>      if (!visit_type_SmbiosEntryPointType(v, name, &ep_type, errp)) {
>          return;
>      }
> -    pcms->smbios_entry_point_type = ep_type;
> +    pcmc->default_smbios_ep_type = ep_type;

class field is supposed to be constant, not something modified by property
drop all of above hunks


>      pc_machine_init_smbios(pcms);
>  }

and use this with the rest of your patch

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index b3d826a83a..c5bab28e9c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1859,7 +1859,7 @@ 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_entry_point_type = SMBIOS_ENTRY_POINT_TYPE_32;
+    pcms->smbios_entry_point_type = pcmc->default_smbios_ep_type;
 
     /* acpi build is enabled by default if machine supports it */
     pcms->acpi_build_enabled = PC_MACHINE_GET_CLASS(pcms)->has_acpi_build;
@@ -1979,6 +1979,7 @@ static void pc_machine_class_init(ObjectClass *oc, void 
*data)
     mc->nvdimm_supported = true;
     mc->smp_props.dies_supported = true;
     mc->default_ram_id = "pc.ram";
+    mc->default_smbios_ep_type = SMBIOS_ENTRY_POINT_TYPE_64;
 
     object_class_property_add(oc, PC_MACHINE_MAX_RAM_BELOW_4G, "size",
         pc_machine_get_max_ram_below_4g, pc_machine_set_max_ram_below_4g,


>  
> @@ -2002,6 +2005,7 @@ static void pc_machine_class_init(ObjectClass *oc, void 
> *data)
>      mc->nvdimm_supported = true;
>      mc->smp_props.dies_supported = true;
>      mc->default_ram_id = "pc.ram";
> +    pcmc->default_smbios_ep_type = SMBIOS_ENTRY_POINT_TYPE_64;
>  
>      object_class_property_add(oc, PC_MACHINE_MAX_RAM_BELOW_4G, "size",
>          pc_machine_get_max_ram_below_4g, pc_machine_set_max_ram_below_4g,
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index da6ba4eeb4..1a2bb25c75 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -467,11 +467,16 @@ DEFINE_I440FX_MACHINE(v8_1, "pc-i440fx-8.1", NULL,
>  
>  static void pc_i440fx_8_0_machine_options(MachineClass *m)
>  {
> +    PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
> +
>      pc_i440fx_8_1_machine_options(m);
>      m->alias = NULL;
>      m->is_default = false;
>      compat_props_add(m->compat_props, hw_compat_8_0, hw_compat_8_0_len);
>      compat_props_add(m->compat_props, pc_compat_8_0, pc_compat_8_0_len);
> +
> +    /* For pc-i44fx-8.0 and older, use SMBIOS 2.8 by default */
> +    pcmc->default_smbios_ep_type = SMBIOS_ENTRY_POINT_TYPE_32;
>  }
>  
>  DEFINE_I440FX_MACHINE(v8_0, "pc-i440fx-8.0", NULL,
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index a58cd1d3ea..371cca7484 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -379,10 +379,15 @@ DEFINE_Q35_MACHINE(v8_1, "pc-q35-8.1", NULL,
>  
>  static void pc_q35_8_0_machine_options(MachineClass *m)
>  {
> +    PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
> +
>      pc_q35_8_1_machine_options(m);
>      m->alias = NULL;
>      compat_props_add(m->compat_props, hw_compat_8_0, hw_compat_8_0_len);
>      compat_props_add(m->compat_props, pc_compat_8_0, pc_compat_8_0_len);
> +
> +    /* For pc-q35-8.0 and older, use SMBIOS 2.8 by default */
> +    pcmc->default_smbios_ep_type = SMBIOS_ENTRY_POINT_TYPE_32;
>  }
>  
>  DEFINE_Q35_MACHINE(v8_0, "pc-q35-8.0", NULL,
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index c661e9cc80..6eec0fc51d 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -110,6 +110,7 @@ struct PCMachineClass {
>      bool smbios_defaults;
>      bool smbios_legacy_mode;
>      bool smbios_uuid_encoded;
> +    SmbiosEntryPointType default_smbios_ep_type;
>  
>      /* RAM / address space compat: */
>      bool gigabyte_align;