Features/Documentation/interop

QMP:

• Specification (docs/interop/qmp-spec.txt)
• QEMU QMP interface reference (docs/interop/qemu-qmp-ref.texi)

QEMU Guest Agent:

• Manual (qemu-ga.texi)
• Guest Agent QMP interface reference (docs/interop/qemu-ga-ref.texi)

File formats:

• Parallels expandable image (docs/interop/parallels.txt)
• QCOW2 (docs/interop/qcow2.txt)
• QED (docs/interop/qed_spec.txt)

Block layer:

• Live Block Device Operations (docs/interop/live-block-operations.rst)

Network/socket protocols:

• vhost-user (docs/interop/vhost-user.txt)
• VNC ledstate extension (docs/interop/vnc-ledstate-Pseudo-encoding.txt)