SymptomsAlmost on all CPUs used in Mini Macs Virtualization is supported, but in several Mac models it may be disabled in firmware.
ResolutionHow to check that Intel VT-x is supported in CPU:
1. Open Terminal application from Application/Utilities
2. Copy/paste command bellow
sysctl -a | grep machdep.cpu.features
3. You may see output similar to the one bellow
Mac:~ user$ sysctl -a | grep machdep.cpu.features
kern.exec: unknown type returned
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM SSE3 MON VMX EST TM2 TPR PDCM
If you see VMX entry then CPU supports Intel VT-x feature, but it still may be disabled.
Please install all firmware updates from Apple to resolve this issue