bhyve: Detecting that a guest kernel has booted

[Shawn Webb]

On Mon, Mar 11, 2019 at 05:04:20PM +0000, Mark Raynsford via freebsd-virtualization wrote:
> Hello!
> 
> Leaving aside userland monitoring tools such as Prometheus[0], is there
> any way to detect on the host that a guest kernel running in bhyve has
> booted? I'm assuming "booted" in this sense to mean "PID 1 has probably
> started". I'm guessing that there probably isn't, but I thought I'd
> better ask anyway. "Not booted" would mean something like "Is sitting
> at the Grub prompt doing nothing".

If your guest OS supports it, you could probably write two scripts that
uses virtio_console(4), one for the guest to tell the host "HELLO" and
one for the host to say "NICE TO SEE YOU!" once the guest's "HELLO" is
received.

Of course, replace the "HELLO" and "NICE TO SEE YOU!" with the right
logic you're looking for. ;)

The "HELLO" bit could be written as an init script.

Thanks,

-- 
Shawn Webb
Cofounder and Security Engineer
HardenedBSD

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