So my gaming VM stopped booting today.  Conincidentally it was when I added some isolated cores.  However disabling those did not help and other VM's boot fine.  When I say it doesn't boot, what I mean is I can't see any screen via either GPU passthrough or VNC.  Again, both of those work in another VM.

 

I'm assuming the bios isn't loading for some reason but I can't seem to find where that might be stored so I can check / replace.  Other thing I actually didn't try yet is seeing if I can prove it's on the network somehow after I've started it.  It says it's started in the VM manager and there are no errors in the logs.  Go figure.

 

Any other ideas?

 

Thanks.

Actually - I've just checked the CPU - there's no way it's running so it's definitely BIOS.  Which I'm sure must be stored in a file somewhere, that is specific to that VM and needing to be replaced or something.

To work around it I created a new VM and pointed it at the disk I was using.  Now works.  Would be good to know for next time though.