and Wayfire appeared. I spun around some workspaces, figured out the `d` key so I could C-d and close the terminal window, and played around for a couple minutes. Then, I ended it by hitting enter and typed `reboot` (not `poweroff`, which will hang for an amount of time I was too impatient to wait for) in the serial console in the terminal I ran the above command with.
Poweroff obviously hangs forever, as on x86 reboot is something relatively well-defined with some level of consistency since the 8086 days, and poweroff is a relatively recent (ACPI was released in 1996) addition and a horrible mess. So CrosVM supports the former (and uses it to exit) but not the latter. (Some people might remember the https://i.stack.imgur.com/pY00J.jpg image, Linux version is just a line of text: https://gss0.baidu.com/-vo3dSag_xI4khGko9WTAnF6hhy/zhidao/pic/item/a71ea8d3f... so it is less memetic)