~# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 23
model : 113
model name : AMD Ryzen 9 3900X 12-Core Processor
stepping : 0
microcode : 0xffffffff
cpu MHz : 3792.882
cache size : 512 KB
physical id : 0
siblings : 6
core id : 0
cpu cores : 6
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
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 fxsr_opt rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid tsc_known_freq pni ssse3 sse4_1 sse4_2 movbe popcnt aes hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a 3dnowprefetch ssbd vmmcall fsgsbase arat
bugs : fxsave_leak sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips : 7585.76
TLB size : 3072 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management:VirtualBox may expose less features to guests. Say, avx2 is still missing.
After digging in the code, use the following to forcedly enable a flag.
VBoxManage setextradata VMName VBoxInternal/CPUM/SSE4.2 1
The full list is available around CFGMR3ValidateConfig(pIsaExts, "/CPUM/IsaExts/", in src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp
The current list (v6.1.22) is
- 3DNOWPRF
- ABM
- AESNI
- AVX
- AVX2
- AXMMX
- CLFLUSHOPT
- CMPXCHG16B
- FSGSBASE
- FlushCmdMsr
- INVPCID
- MISALNSSE
- MONITOR
- MOVBE
- MWaitExtensions
- PCID
- PCLMUL
- POPCNT
- RDRAND
- RDSEED
- SSE4.1
- SSE4.2
- SSE4A
- XSAVE
There are checks (same file) to determine whether a feature is actually exposed to the guest. For example, avx2 requires xsave, and xsave requires unrestricted guest execution mode, which is currently unavailable under Windows Virtualization Platform. A few grep-ing around the code is required to obtain the answers.