feat: Detect nested virtualization (#94)

  CPU_FLAGS="$DEFAULT_FLAGS,$CPU_FLAGS"

fi

CLOCK="/sys/devices/system/clocksource/clocksource0/current_clocksource"

[ -f "$CLOCK" ] && CLOCK=$(<"$CLOCK")

if [[ "${CLOCK,,}" == "kvm-clock" ]]; then

  if [[ "$CPU_VENDOR" != "GenuineIntel" ]] && [[ "${CPU_CORES,,}" == "2" ]]; then

    warn "Restricted processor to a single core because nested virtualization was detected!"

    CPU_CORES="1"

  else

    warn "Nested virtualization was detected, this might cause issues running macOS!"

  fi

fi

if [[ "${CLOCK,,}" == "hpet" ]]; then

  warn "Your clocksource is HPET instead of TSC, this will cause issues running macOS!"

fi

case "$CPU_CORES" in

  "" | "0" | "3" ) CPU_CORES="2" ;;

  "5" ) CPU_CORES="4" ;;