qemu to linux mapping of smbios / dmi information

README.md

Mappings for DMI/SMBIOS to Linux and dmidecode

Information can be put into dmi tables via some qemu-system hosts (x86_64 and aarch64). That information is exposed in Linux under /sys/class/dmi/id and can be read with dmidecode. The names are very annoyingly inconsistent. The point of this doc is to map them.

See qemu-system-x86_64 --help for the fields that qemu will accept. qemu smbios flags vary with qemu version.

Mappings

Example qemu cmdline:

qemu-system-x86_64 -smbios type=<type>,field=value[,...]
qemu-system-x86_64 -smbios type=0,vendor=superco,version=1.2.3

type	-smbios field	Linux path	dmidecode --string=F
0	vendor	bios_vendor	bios-vendor
0	date	bios_date	bios-release-date
0	version	bios_version	bios-version
0	release=(%d.%d)	bios_release	bios-revision
0	uefi=(on|off)	n/a	n/a
1	manufacturer	sys_vendor	system-manufacturer
1	product	product_name	system-product-name
1	version	product_version	system-version
1	serial	product_serial	system-serial-number
1	uuid	product_uuid	system-uuid
1	sku	product_sku	system-sku-number
1	family	product_family	system-family
2	manufacturer	board_vendor	baseboard-manufacturer
2	product	board_name	baseboard-product-name
2	version	board_version	baseboard-version
2	serial	board_serial	baseboard-serial-number
2	asset	asset_tag	baseboard-asset-tag
2	location	n/a	n/a
3	manufacturer	chassis_vendor	chassis-manufacturer
3	version	chassis_version	chassis-version
3	serial	chassis_serial	chassis-serial-number
3	asset	chassis_asset_tag	chassis-asset-tag
3	sku	n/a	n/a
4	sock_pfx	n/a	n/a
4	manufacturer	n/a	processor-manufacturer
4	version	n/a	processor-version
4	serial	n/a	n/a
4	asset	n/a	n/a
4	part	n/a	n/a
4	max-speed	n/a	n/a
4	current-speed	n/a	processor-frequency
11	value	n/a	--oem-string=N
17	loc_pfx	n/a	n/a
17	bank	n/a	n/a
17	manufacturer	n/a	n/a
17	serial	n/a	n/a
17	asset	n/a	n/a
17	part=(%d)	n/a	n/a
17	speed=(%d)	n/a	n/a

Notes

• linux exposes these files in /sys/devices/virtual/dmi/id and /sys/class/dmi/id
• go-smbios can be used to read OEM strings and other smbios info. More info on OEM string information linked from Bug 1753559

values in /sys/class/dmi/id

• 6.14.7

  $ ( cd /sys/class/dmi/id && grep -r . *)
  bios_date:0date
  bios_release:0.0
  bios_vendor:0vendor
  bios_version:0version
  board_asset_tag:t2asset
  board_name:t2product
  board_serial:t2serial
  board_vendor:t2manufacturer
  board_version:t2version
  chassis_asset_tag:t3asset
  chassis_serial:t3serial
  chassis_type:1
  chassis_vendor:t3manufacturer
  chassis_version:t3version
  modalias:dmi:bvn0vendor:bvr0version:bd0date:br0.0:svnt1manufacturer:pnt1product:pvrt1version:rvnt2manufacturer:rnt2product:rvrt2version:cvnt3manufacturer:ct1:cvrt3version:skut1sku:
  power/runtime_active_time:0
  power/runtime_status:unsupported
  power/runtime_suspended_time:0
  power/control:auto
  product_family:t1family
  product_name:t1product
  product_serial:t1serial
  product_sku:t1sku
  product_uuid:11111111-1111-1111-1111-111111111111
  product_version:t1version
  sys_vendor:t1manufacturer
  uevent:MODALIAS=dmi:bvn0vendor:bvr0version:bd0date:br0.0:svnt1manufacturer:pnt1product:pvrt1version:rvnt2manufacturer:rnt2product:rvrt2version:cvnt3manufacturer:ct1:cvrt3version:skut1sku:
  
  $ dmidecode --version
  3.6
  
  $ for i in $(dmidecode --list-strings); do
      out=$(dmidecode --string=$i) && echo "$i: $out"; done
  bios-vendor: 0vendor
  bios-version: 0version
  bios-release-date: 0date
  bios-revision: 0.0
  firmware-revision:
  system-manufacturer: t1manufacturer
  system-product-name: t1product
  system-version: t1version
  system-serial-number: t1serial
  system-uuid: 11111111-1111-1111-1111-111111111111
  system-sku-number: t1sku
  system-family: t1family
  baseboard-manufacturer: t2manufacturer
  baseboard-product-name: t2product
  baseboard-version: t2version
  baseboard-serial-number: t2serial
  baseboard-asset-tag: t2asset
  chassis-manufacturer: t3manufacturer
  chassis-type: Other
  chassis-version: t3version
  chassis-serial-number: t3serial
  chassis-asset-tag: t3asset
  processor-family: Other
  processor-manufacturer: t4manufacturer
  processor-version: t4version
  processor-frequency: 4443 MHz
  

• Cirros 0.6.3 (5.15.0-117-generic)

  bios_date:0date
  bios_release:0.0
  bios_vendor:0vendor
  bios_version:0version
  board_asset_tag:t2asset
  board_name:t2product
  board_serial:t2serial
  board_vendor:t2manufacturer
  board_version:t2version
  chassis_asset_tag:t3asset
  chassis_serial:t3serial
  chassis_type:1
  chassis_vendor:t3manufacturer
  chassis_version:t3version
  modalias:dmi:bvn0vendor:bvr0version:bd0date:br0.0:svnt1manufacturer:pnt1product:pvr:
  product_family:t1family
  product_name:t1product
  product_serial:t1serial
  product_sku:t1sku
  product_uuid:11111111-1111-1111-1111-111111111111
  product_version:t1version
  sys_vendor:t1manufacturer
  uevent:MODALIAS=dmi:bvn0vendor:bvr0version:bd0date:br0.0:svnt1manufacturer:pnt1prod:
  

qemu smbios flags

Below is the --help output of qemu-system-x86 wrt -smbios. See boot-guest file for actual values used

$ qemu-system-x86_64 --version
QEMU emulator version 10.0.2 (v10.0.2)

$ qemu-system-x86_64 --help | grep -A1 -- ^-smbios | sed 's,^--$,,'
-smbios file=binary
                load SMBIOS entry from binary file
-smbios type=0[,vendor=str][,version=str][,date=str][,release=%d.%d]
              [,uefi=on|off]

-smbios type=1[,manufacturer=str][,product=str][,version=str][,serial=str]
              [,uuid=uuid][,sku=str][,family=str]

-smbios type=2[,manufacturer=str][,product=str][,version=str][,serial=str]
              [,asset=str][,location=str]

-smbios type=3[,manufacturer=str][,version=str][,serial=str][,asset=str]
              [,sku=str]

-smbios type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str]
              [,asset=str][,part=str][,max-speed=%d][,current-speed=%d]

-smbios type=8[,external_reference=str][,internal_reference=str][,connector_type=%d][,port_type=%d]
                specify SMBIOS type 8 fields
-smbios type=11[,value=str][,path=filename]
                specify SMBIOS type 11 fields
-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str]
               [,asset=str][,part=str][,speed=%d]

-smbios type=41[,designation=str][,kind=str][,instance=%d][,pcidev=str]
                specify SMBIOS type 41 fields

boot-guest

#!/bin/bash
# download cirros image and boot it.
MEM=${MEM:-256}
ARCH="x86_64"

ver="0.6.3"
img_url="http://download.cirros-cloud.net/$ver/cirros-$ver-$ARCH-disk.img"
img_dist=${1:-${img_url##*/}}
if [ ! -f "$img_dist" ]; then
   wget "$img_url" -O "$img_dist.tmp" &&
      mv "$img_dist.tmp" "$img_dist"
fi

echo "$ARCH/$MEM [$img_dist]"

echo '{"instance-id": "9068aef2-213e-4e43-830f-accdbadde897"}' > meta-data
cat > user-data <<"EOF"
#!/bin/sh
uname -r
echo "===== BEGIN dmi/id data ====="
cd /sys/class/dmi/id
grep -r . * 2>/dev/null
echo "===== END   dmi/id data ====="
poweroff
EOF

cloud-localds seed.img user-data meta-data ||
    { echo "cloud-localds failed"; exit 1; }

out=$(qemu-img create -fqcow2 -Fqcow2 -b"$img_dist" disk1.img) ||
    { echo "qemu-img create failed: $out"; exit 1; }

#shellcheck disable=SC2054
smbios=(
    "-smbios" "type=0,vendor=0vendor,version=0version,date=0date,release=0.0,uefi=on"
    "-smbios" "type=1,manufacturer=t1manufacturer,product=t1product,version=t1version,serial=t1serial,uuid=11111111-1111-1111-1111-111111111111,sku=t1sku,family=t1family"
    "-smbios" "type=2,manufacturer=t2manufacturer,product=t2product,version=t2version,serial=t2serial,asset=t2asset,location=t2location"
    "-smbios" "type=3,manufacturer=t3manufacturer,version=t3version,serial=t3serial,asset=t3asset,sku=t3sku"
    "-smbios" "type=4,sock_pfx=t4sock_pfx,manufacturer=t4manufacturer,version=t4version,serial=t4serial,asset=t4asset,part=t4part,max-speed=4444,current-speed=4443"
    # type=8 doesn't just take anything - boot hangs
    # "-smbios" "type=8,external_reference=t8external_reference,internal_reference=t9internal_reference,connector_type=8888,port_type=8887"
    "-smbios" "type=11,value=Hello,value=World",
    "-smbios" "type=17,loc_pfx=t17loc_pfx,bank=t17bank,manufacturer=t17manufacturer,serial=t17serial,asset=t17asset,part=t17part,speed=171717"
    # type=41 does not just take anything - boot hangs
    # "-smbios", "type=41,designation=t41designation,kind=other,instance=4141,pcidev=t41pcidev"
)

set -x
qemu-system-x86_64 -m "$MEM" \
   -device virtio-net-pci,netdev=net00 \
   -netdev type=user,id=net00,net=10.0.12.0/24,host=10.0.12.2 \
   -drive if=virtio,file=disk1.img \
   -drive if=virtio,file=seed.img \
   -nographic \
   "${smbios[@]}"

Hi @smoser,

type	-smbios field	Linux path	dmidecode --string=F
1	sku	n/a	n/a
1	family	product_family	n/a

At least with Linux 6.14.6 and dmidecode v3.6, it looks like those are:

type	-smbios field	Linux path	dmidecode --string=F
1	sku	product_sku	system-sku-number
1	family	product_family	system-family

At least with Linux 6.14.6 and dmidecode v3.6, it looks like those are:

Thanks, @franferrax . I updated the table and also fixed 'boot-guest' to actually work.