[vbox-dev] [PATCH] Fix for Guest "OS type" future-compatibility

[Alexey Eromenko]

so...
I would like to have this patch evaluated, and possibly included into v5.0.
Why ? Because this is a pre-requirement for unattended installs.
And it will allow unattended VM to be run, if users later downgrade
from VirtualBox 6.0 to 5.0.

my potential plan is this:
VBox A supports unattended Fedora 20/21/22
VBox A+1 supports unattended Fedora 22/23/24 (removes previous Fedora support)
VBox A+2 supports unattended Fedora 24/25/26 (removes previous Fedora support)

So this patch will allow to add or remove various OS type support at will.
And it will allow future OSes to be run on VirtualBox 5.0.0, without
changes (VBox downgrade).

As for CPU instructions, I think if the host CPU supports them, it
should be enabled/passed on to the guest.

-Technologov