bhyve: Detecting that a guest kernel has booted

[Shawn Webb]

On Mon, Mar 11, 2019 at 05:21:58PM +0000, Mark Raynsford wrote:
> On 2019-03-11T13:08:53 -0400
> Shawn Webb <shawn.webb at hardenedbsd.org> wrote:
> >
> > 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.
> > 
> 
> They're a mix of FreeBSD, OpenBSD, and Debian guests. So I'm guessing
> one out of three of those supports it...
> 
> I suppose my other option would be to add (another) NFS mount in each
> guest, and have them touch a file early in the init script (and
> possibly touch a different file early in the shutdown script).

Both FreeBSD and Linux supports virtio_console(4). I have no idea
about OpenBSD, but I'm sure they'd be open to an implementation if
asked.

The NFS solution would work, but it would be somewhat fragile. What
happens when a VM crashes? What happens when the host crashes?

Thanks,

-- 
Shawn Webb
Cofounder and Security Engineer
HardenedBSD

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