Pass a string to a guest as though the string had been entered from the command line
cmdline commandline
The following connects a terminal console and sets up log and debug parameters for a Linux guest running on a virtualized ARM platform:
cmdline "console=ttyAMA0 earlycon=pl011,0x1c090000 \ debug user_debug=31 loglevel=9"
You can pass the string specified by commandline to a Linux kernel or to multiboot (ELF) images used for QNX guests.
The cmdline option makes command-line input available to the guest in various ways, depending on the guest image format and the guest architecture. How the input is interpreted is the responsibility of the guest.