How to automatically install guest drivers inside a Windows VM

[Cameron Showalter]

I'm trying to write an automatic way to install drivers inside guests, and
I'm starting with Windows first. I'm trying to follow this guide here:

https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/html/virtual_machine_management_guide/installing_guest_agents_and_drivers_windows

So I install virtio-win to the host, and mount that as a cd-rom inside the
Windows 10 VM. I then want to install ALL drivers and agents like so
(Command Prompt as Admin, go to the drive letter the iso is mounted as
before running this):

start /wait msiexec /i "virtio-win-gt-x64.msi" /qn ADDLOCAL=ALL
<wait a few minutes JUST TO BE SURE it finished>
<restart VM>

And from what I can tell, it works. I can go into device manager, and see
drivers for virtio-balooning  / etc. The problem is in virt-manager, going
to "View: Scale Displays: Auto-resize VM with window", and it's still
greyed out. (Says Guest Agent is not available). Going to "View: Consoles",
it says I have "Graphical Console Spice" selected. Any idea what I might be
doing wrong?

And, is this the right approach for automatic guest drivers? Mounting the
iso, then use something like "virsh x-exec" to run that msiexec command
above.

Thanks!
Cameron
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