[$] Accessing QEMU storage features without a VM

The QEMU emulator has a sizable set ofstorage features, including disk-image file formats like qcow2, snapshots, incremental backup, and storage migration, which are available to virtualmachines. This software-defined storage functionality that is availableinside QEMU has not been easily accessible outside of it, however. Kevin Wolf and Stefano Garzarellapresented at KVM Forum 2022 on the new qemu-storage-daemon program and the libblkiolibrary that make QEMU's storage functionality available even when the goalis not to run a virtual machine (VM).