Step 1 - Enable NBD on the Host
modprobe nbd max_part=8
Step 2 - Connect the QCOW2 as network block device
qemu-nbd --connect=/dev/nbd0 /srv/vm/image.qcow2
Step 3 - Find The Virtual Machine Partitions
fdisk /dev/nbd0 -l
Step 4 - Mount the partition from the VM
mount /dev/nbd0p1 /mnt/somepoint/
Step 5 - After you done, unmount and disconnect
umount /mnt/somepoint/ qemu-nbd --disconnect /dev/nbd0 rmmod nbd