ChangeLog/4.2

System emulation

Incompatible changes

The minimum version of the glib library is now 2.48

New deprecated options and features

Consult the "Deprecated Features" appendix for the full list of historically deprecated features/options.

Alpha

68k

Arm

HPPA

Microblaze

MIPS

Fixed bug involving emulation of ST.W instruction in system mode only (there was no bug in Linux user mode).

Nios2

OpenRISC

PowerPC

RISC-V

s390

SH

SPARC

TileGX

Tricore

x86

Xtensa

Device emulation and assignment

ACPI

Audio

Block devices

GPIO

Graphics

Input devices

IPMI

Network devices

NVDIMM

PCI/PCIe

SCSI

SMBIOS

TPM

USB

VFIO

virtio

Xen

fw_cfg

9pfs

Semihosting

Audio

Character devices

Crypto subsystem

GUI

Host support

Any backend that supports connection as an Inet client (NBD, chardev, network device, monitor...) can now request to use TCP keep-alive with the server.

Memory backends

Monitor

 * bugs in gdbstub handling of F and ! packets have been fixed

Migration

Network

Block device backends and tools

Block drivers can now support BDRV_REQ_PREFETCH for more efficient handling of copy-on-read requests; the NBD driver has wired this up to NBD_CMD_CACHE.
The LUKS block driver supports falloc/full preallocation

Tracing

Miscellaneous

User-mode emulation

Alpha

TCG

Guest agent

Build Information

Python

GIT submodules

Build Dependencies

The minimum version of the glib library is now 2.48

Testing

Windows

Known issues

see Planning/4.2