Re: [PATCH v2 1/4] smbios: add processor-family option

[Alistair Francis]

On Fri, Dec 29, 2023 at 10:48 PM Heinrich Schuchardt
<heinrich.schuchardt@canonical.com> wrote:
>
> For RISC-V the SMBIOS standard requires specific values of the processor
> family value depending on the bitness of the CPU.

Can you provide some details of where this is described? I can't seem to find it

Alistair

>
> Add a processor-family option for SMBIOS table 4.
>
> The value of processor-family may exceed 255 and therefore must be provided
> in the Processor Family 2 field. Set the Processor Family field to 0xFE
> which signals that the Processor Family 2 is used.
>
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
> ---
> v2:
>         new patch
> ---
>  hw/smbios/smbios.c | 13 +++++++++++--
>  qemu-options.hx    |  4 ++--
>  2 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
> index 2a90601ac5..647bc6d603 100644
> --- a/hw/smbios/smbios.c
> +++ b/hw/smbios/smbios.c
> @@ -102,6 +102,7 @@ static struct {
>  #define DEFAULT_CPU_SPEED 2000
>
>  static struct {
> +    uint16_t processor_family;
>      const char *sock_pfx, *manufacturer, *version, *serial, *asset, *part;
>      uint64_t max_speed;
>      uint64_t current_speed;
> @@ -110,6 +111,7 @@ static struct {
>      .max_speed = DEFAULT_CPU_SPEED,
>      .current_speed = DEFAULT_CPU_SPEED,
>      .processor_id = 0,
> +    .processor_family = 0x01, /* Other */
>  };
>
>  struct type8_instance {
> @@ -337,6 +339,10 @@ static const QemuOptDesc qemu_smbios_type4_opts[] = {
>          .name = "part",
>          .type = QEMU_OPT_STRING,
>          .help = "part number",
> +    }, {
> +        .name = "processor-family",
> +        .type = QEMU_OPT_NUMBER,
> +        .help = "processor family",
>      }, {
>          .name = "processor-id",
>          .type = QEMU_OPT_NUMBER,
> @@ -726,7 +732,7 @@ static void smbios_build_type_4_table(MachineState *ms, 
> unsigned instance)
>      snprintf(sock_str, sizeof(sock_str), "%s%2x", type4.sock_pfx, instance);
>      SMBIOS_TABLE_SET_STR(4, socket_designation_str, sock_str);
>      t->processor_type = 0x03; /* CPU */
> -    t->processor_family = 0x01; /* Other */
> +    t->processor_family = 0xfe; /* use Processor Family 2 field */
>      SMBIOS_TABLE_SET_STR(4, processor_manufacturer_str, type4.manufacturer);
>      if (type4.processor_id == 0) {
>          t->processor_id[0] = cpu_to_le32(smbios_cpuid_version);
> @@ -758,7 +764,7 @@ static void smbios_build_type_4_table(MachineState *ms, 
> unsigned instance)
>      t->thread_count = (threads_per_socket > 255) ? 0xFF : threads_per_socket;
>
>      t->processor_characteristics = cpu_to_le16(0x02); /* Unknown */
> -    t->processor_family2 = cpu_to_le16(0x01); /* Other */
> +    t->processor_family2 = cpu_to_le16(type4.processor_family);
>
>      if (tbl_len == SMBIOS_TYPE_4_LEN_V30) {
>          t->core_count2 = t->core_enabled2 = cpu_to_le16(cores_per_socket);
> @@ -1402,6 +1408,9 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
>                  return;
>              }
>              save_opt(&type4.sock_pfx, opts, "sock_pfx");
> +            type4.processor_family = qemu_opt_get_number(opts,
> +                                                         "processor-family",
> +                                                         0x01 /* Other */);
>              save_opt(&type4.manufacturer, opts, "manufacturer");
>              save_opt(&type4.version, opts, "version");
>              save_opt(&type4.serial, opts, "serial");
> diff --git a/qemu-options.hx b/qemu-options.hx
> index b66570ae00..7bdb414345 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -2694,7 +2694,7 @@ DEF("smbios", HAS_ARG, QEMU_OPTION_smbios,
>      "                specify SMBIOS type 3 fields\n"
>      "-smbios 
> type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str]\n"
>      "              
> [,asset=str][,part=str][,max-speed=%d][,current-speed=%d]\n"
> -    "              [,processor-id=%d]\n"
> +    "              [,processor-family=%d,processor-id=%d]\n"
>      "                specify SMBIOS type 4 fields\n"
>      "-smbios 
> type=8[,external_reference=str][,internal_reference=str][,connector_type=%d][,port_type=%d]\n"
>      "                specify SMBIOS type 8 fields\n"
> @@ -2722,7 +2722,7 @@ SRST
>  ``-smbios 
> type=3[,manufacturer=str][,version=str][,serial=str][,asset=str][,sku=str]``
>      Specify SMBIOS type 3 fields
>
> -``-smbios 
> type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str][,asset=str][,part=str][,processor-id=%d]``
> +``-smbios 
> type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str][,asset=str][,part=str][,processor-family=%d][,processor-id=%d]``
>      Specify SMBIOS type 4 fields
>
>  ``-smbios type=11[,value=str][,path=filename]``
> --
> 2.43.0
>
>