QEMU QCOW Image (v3)

# file vm-101-disk-0.qcow2 
vm-101-disk-0.qcow2: QEMU QCOW Image (v3), 107374182400 bytes (v3), 107374182400 bytes

apt install qemu-utils

modprobe nbd max_part=8
qemu-nbd --connect=/dev/nbd0 vm-1061-disk-0.qcow2

# unload 
qemu-nbd -d /dev/nbd0

After this

Disk /dev/nbd0: 100 GiB, 107374182400 bytes, 209715200 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x28288fb3

Device      Boot    Start       End   Sectors  Size Id Type
/dev/nbd0p1 *        2048   3905535   3903488  1.9G 83 Linux
/dev/nbd0p2       3905536  11718655   7813120  3.7G 82 Linux swap / Solaris
/dev/nbd0p3      11718656 209715199 197996544 94.4G 83 Linux

RAW

vm-1014-disk-1.raw: DOS/MBR boot sector; partition 1 : ID=0xee, start-CHS (0x0,0,1), end-CHS (0x3ff,254,63), startsector 1, 209715199 sectors, extended partition table (last)

losetup -f -P --show vm-1014-disk-1.raw
# output like /dev/loop16

# unload 
losetup -d /dev/loop16

After this

Disk /dev/loop16: 100 GiB, 107374182400 bytes, 209715200 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 49400ED0-2144-4854-BA3D-64A88C3EC9C8

Device        Start       End   Sectors  Size Type
/dev/loop16p1  2048 209713151 209711104  100G Microsoft basic data
GPT PMBR size mismatch (1952448511 != 1953525167) will be corrected by write.
The backup GPT table is not on the end of the device.

LVM

From lsblk

/dev/mapper/pve-vm--118--disk--0

apt-get install kpartx
kpartx -a /dev/mapper/pve-vm--118--disk--0

After this,

# ls /dev/mapper/pve-vm--118--disk--*
/dev/mapper/pve-vm--118--disk--0  /dev/mapper/pve-vm--118--disk--0p1  /dev/mapper/pve-vm--118--disk--0p2  /dev/mapper/pve-vm--118--disk--0p3

# fdisk -l 
...

Disk /dev/mapper/pve-vm--118--disk--0: 50 GiB, 53687091200 bytes, 104857600 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 65536 bytes
Disklabel type: dos
Disk identifier: 0x28288fb3

Device                             Boot    Start       End  Sectors  Size Id Type
/dev/mapper/pve-vm--118--disk--0p1 *        2048   3905535  3903488  1.9G 83 Linux
/dev/mapper/pve-vm--118--disk--0p2       3905536  11718655  7813120  3.7G 82 Linux swap / Solaris
/dev/mapper/pve-vm--118--disk--0p3      11718656 104855551 93136896 44.4G 83 Linux

# undo
kpartx -d /dev/mapper/pve-vm--118--disk--0