ChangeLog/9.2

Release schedule: Planning/9.2.

System emulation

Removed features and incompatible changes

• The -rotate and -portrait options were only useful with PXA2xx machines, which have all now been removed. These command line options have therefore also been removed.

Consult the 'Removed features' page for details of suggested replacement functionality.

New deprecated options and features

Consult the "Deprecated Features" chapter of the QEMU System Emulation User's Guide for further details of the deprecations and their suggested replacements.

Arm

• New CPU architectural features emulated:
  • FEAT_EBF16

• Changes to existing board models:
  • sbsa-ref now has an SMMU capable of two-stage translation
  • the virt board now has an SMMU capable of two-stage translation
  • xilinx-zynq-a9 now enables the Security Extensions on the CPU

• gdbstub
  • Now support MTE in system mode (under TCG emulation)

• The hvf accelerator now supports creating VMs with larger than 36 bit address space (and thus 64GB or more of RAM), when the host is macos 15 or newer and the host CPU supports it

• Some older machine types which were deprecated in the 9.0 release have now been removed: akita, borzoi, cheetah, connex, mainstone, n800, n810, spitz, terrier, tosa, verdex, z2

• when QEMU is built with the experimental Rust feature, an alternative PL011 implementation in Rust is selected by default. It is not migrateable and not recommended for actual use.

CRIS

The CRIS target has been removed without replacement (The CRIS architecture was pulled from Linux in 4.17 and the compiler was no longer packaged in any distro making it hard to test this target).

HPPA

• Fix saving and restoring PSW V-Bit (division step) accross interrupts
• Fix linux-user emulation issues on 64-bit CPU

MIPS

• Fix for booting the jazz machine with the -nic ...,model=dp83932 option

Renesas SH (sh4)

• The unmaintained "shix" machine has been removed
• The big endian system emulation ("qemu-system-sh4eb") has been disabled since there was no usable machine left for this target

RISC-V

ISA and Extensions

• Add a property to set vl to ceil(AVL/2)
• Add 'fcsr' register to QEMU log as a part of F extension
• Add preliminary textra trigger CSR functions
• Add Svvptc extension support
• Fix masking of rv32 physical address

Machines

• Enable Bit Manip for OpenTitan Ibex CPU
• Fix the group bit setting of AIA with KVM

Fixes and Misc

• Consider MISA bit choice in implied rule
• Fix the za64rs priv spec requirements
• Stop timer with infinite timecmp
• Fix riscv64 build on musl libc
• RISC-V bsd-user support
• Fix linking problem with semihosting disabled
• Fix IMSIC interrupt state updates

SPARC

• Implement a single entry floating-point exception queue for sparc v7/v8. This fixes a hang on Solaris 7, which assumes the queue exists and is non-empty on entry to the exception handler.

Device emulation and assignment

virtio

• virtio-mem now supports suspend/resume on x86-64.

Character devices

• socket: introduce 'reconnect-ms' and deprecate 'reconnect'
• pty: add "path" option, create a symbolic to the given path that points to the allocated PTY

Crypto subsystem

• The glib crypto backend now supports the SHA-384 hash
• A Linux bug that would cause the PBKDF code that estimates iterations to sometimes hang has been worked around by running in a new throwaway thread
• IOtests expected output has been fixed for recent gnutls changes
• Error reporting has been improved for unsupported cipher modes
• Memory leak fixed when dealing with unsupported cipher modes

GUI

• allocate shareable display memory on Unix
• -display dbus now provides a Unix.Map interface, to share the display memory with the client
• fix -display dbus discarding cursor updates

TCG Plugins

• Deprecated for TCI backend
• Deprecated for 32 bit hosts
• Extended the memory API to provide the value used
• Fixed a timer deadlock if time doesn't change
• Fixed a bug in IPS plugin to avoid not changing time
• Added cflow plugin
• New memory API for reading vaddr
• Added basic block vector plugin

Migration

• Added QATZIP support for multifd compressors.
• Fixed one multifd race condition crash (against received bitmap).

Build Information

Support for device models written in the Rust programming language has been added. It is considered experimental and not stable, and it is not recommended to be used for anything other than development. It is disabled by default and can be enabled by passing the flag --enable-rust to the configure script.

Build Dependencies

• An optional dependency to the rustc compiler of at least version 1.80.0 has been added. The bindgen binary must also be present and of version at least 0.69.4.

Configuration

• The gitlab-runner ansible script has been updated

Docker Tweaks

• Updated i686 and mipsel images to bookworm

Known issues

• See https://gitlab.com/qemu-project/qemu/-/milestones/14