restore partition table on KVM Red Hat virtual machine

[gerbilio]

HAAAAAAAAAAAALP!!!!! 

I run Fedora on my laptop, which hosts several KVM virtual machines.  Whilst attempting to resize the system partition (a dicey prospect, I know) on the Linux VM, I failed to put an EXT4 file system on the partition, so now it doesn't boot!  All the data should still be there, so if I can juuust get grub to recognize the file system theoretically I should be alright.

Fedora on the laptop is fine so no worries there, but how would I doctor the file system on a partition in a KVM virtual machine?  It ha[d|s] Red Hat on it, btw; though not a registered copy or I'd be calling them.

Many, many TIA...Matt