Question: how to mount qcow2 image?
Answer: Enable NBD kernel driver on the KVM host. ... 
Connect the qcow2 image as network block device. ... 
Find the partitions in the image using fdisk. ... 
The device /dev/nbd0p2, is LVM so you would need to locate the new PVs/VGs and LVs in the KVM host machine. ... 
Activate the guest OS'es VG. ... 
Mount the LVM partition.