No CPU Information with dmidecode in VirtualBox on Linux Environment

**Description:** I am experiencing an issue with obtaining detailed CPU information using the dmidecode command on a Linux guest OS virtual machine running in VirtualBox. The dmidecode command provides only limited data, while other commands like lscpu and cat /proc/cpuinfo return complete CPU details. **Steps to Reproduce:** 1. Install Debian11/12 or Ubuntu22.04 as a guest OS in VirtualBox. 2. Run the sudo dmidecode command to obtain hardware information. **Expected Results:** The dmidecode command should provide detailed CPU information similar to what is provided by lscpu and /proc/cpuinfo. **Actual Results:** The dmidecode command returns limited information, mostly related to the BIOS and basic system configuration. Detailed CPU information is not included. **Example Output:** Here is the output of the sudo dmidecode command on my Debian12 VM:

# dmidecode 3.4
Getting SMBIOS data from sysfs.
SMBIOS 2.5 present.
10 structures occupying 450 bytes.
Table at 0x000E1000.

Handle 0x0000, DMI type 0, 20 bytes
BIOS Information
    Vendor: innotek GmbH
    Version: VirtualBox
    Release Date: 12/01/2006
    Address: 0xE0000
    Runtime Size: 128 kB
    ROM Size: 128 kB
    Characteristics:
        ISA is supported
        PCI is supported
        Boot from CD is supported
        Selectable boot is supported
        8042 keyboard services are supported (int 9h)
        CGA/mono video services are supported (int 10h)
        ACPI is supported

Handle 0x0001, DMI type 1, 27 bytes
System Information
    Manufacturer: innotek GmbH
    Product Name: VirtualBox
    Version: 1.2
    Serial Number: 0
    UUID: e83f6988-828d-5142-a0e2-2bca4c199fc3
    Wake-up Type: Power Switch
    SKU Number: Not Specified
    Family: Virtual Machine

Handle 0x0008, DMI type 2, 15 bytes
Base Board Information
    Manufacturer: Oracle Corporation
    Product Name: VirtualBox
    Version: 1.2
    Serial Number: 0
    Asset Tag: Not Specified
    Features:
        Board is a hosting board
    Location In Chassis: Not Specified
    Chassis Handle: 0x0003
    Type: Motherboard
    Contained Object Handles: 0

Handle 0x0003, DMI type 3, 13 bytes
Chassis Information
    Manufacturer: Oracle Corporation
    Type: Other
    Lock: Not Present
    Version: Not Specified
    Serial Number: Not Specified
    Asset Tag: Not Specified
    Boot-up State: Safe
    Power Supply State: Safe
    Thermal State: Safe
    Security Status: None

Handle 0x0007, DMI type 126, 42 bytes
Inactive

Handle 0x0005, DMI type 126, 15 bytes
Inactive

Handle 0x0006, DMI type 126, 28 bytes
Inactive

Handle 0x0002, DMI type 11, 7 bytes
OEM Strings
    String 1: vboxVer_6.1.50
    String 2: vboxRev_161033

Handle 0x0004, DMI type 128, 8 bytes
OEM-specific Type
    Header and Data:
        80 08 04 00 FF C5 2A 00

Handle 0xFEFF, DMI type 127, 4 bytes
End Of Table

**Commands That Work:** The following commands provide complete CPU details: - lscpu - cat /proc/cpuinfo **Example lscpu Output:**

root@faiserver:~# lscpu
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         39 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  1
  On-line CPU(s) list:   0
Vendor ID:               GenuineIntel
  Model name:            11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
    BIOS Model name:       CPU @ 0.0GHz
    BIOS CPU family:     0
    CPU family:          6
    Model:               140
    Thread(s) per core:  1
    Core(s) per socket:  1
    Socket(s):           1
    Stepping:            1
    BogoMIPS:            5606.39
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse ss
                         e2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_fre
                         q pni pclmulqdq monitor ssse3 cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx rdrand
                         hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase avx2 invpcid rdseed clflushopt
                          md_clear flush_l1d arch_capabilities
Virtualization features:
  Hypervisor vendor:     KVM
  Virtualization type:   full
Caches (sum of all):
  L1d:                   48 KiB (1 instance)
  L1i:                   32 KiB (1 instance)
  L2:                    1.3 MiB (1 instance)
  L3:                    12 MiB (1 instance)
NUMA:
  NUMA node(s):          1
  NUMA node0 CPU(s):     0
Vulnerabilities:
  Gather data sampling:  Unknown: Dependent on hypervisor status
  Itlb multihit:         KVM: Mitigation: VMX unsupported
  L1tf:                  Mitigation; PTE Inversion
  Mds:                   Mitigation; Clear CPU buffers; SMT Host state unknown
  Meltdown:              Mitigation; PTI
  Mmio stale data:       Not affected
  Retbleed:              Not affected
  Spec rstack overflow:  Not affected
  Spec store bypass:     Vulnerable
  Spectre v1:            Mitigation; usercopy/swapgs barriers and __user pointer sanitization
  Spectre v2:            Mitigation; Retpolines, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
  Srbds:                 Not affected
  Tsx async abort:       Not affected
root@faiserver:~#

**Example /proc/cpuinfo Output:**

root@faiserver:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 140
model name      : 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
stepping        : 1
cpu MHz         : 2803.198
cache size      : 12288 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 22
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq monitor ssse3 cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase avx2 invpcid rdseed clflushopt md_clear flush_l1d arch_capabilities
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit gds
bogomips        : 5606.39
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:
root@faiserver:~#

**Request for Assistance:** - Is there a way to configure VirtualBox to expose more detailed SMBIOS information to the guest OS? - Are there any settings or additional steps that can be taken to enable dmidecode to retrieve full CPU information in a VirtualBox VM? - Any insights or suggestions to address this issue would be greatly appreciated. Thank you for your assistance.