ChangeLog/8.1

System emulation

Removed features and incompatible changes

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.

• The "-singlestep" command line option is deprecated, as it was very misleadingly named. Its replacement is "-one-insn-per-tb" (for the user-mode emulator) or "-accel one-insn-per-tb=on" (for the system-mode emulator)

Arm

• New architectural features now emulated:
  • FEAT_PAN3 (Support for SCTLR_ELx.EPAN)
• Pointer-authentication information is now reported to the gdbstub (a GDB 13 or later will produce better backtraces when pauth is in use by the guest)
• Orangepi-PC, Cubieboard: Add Allwinner WDT watchdog emulation
• mcimxd7-sabre, mcimx6ul-evk: The second ethernet controller PHY is now usable

RISC-V

ISA and Extensions

• Support subsets of code size reduction extension
• A large collection of mstatus sum changes and cleanups
• Zero init APLIC internal state
• Implement query-cpu-definitions
• Fix Guest Physical Address Translation
• Make sure an exception is raised if a pte is malformed

Machines

• Add signature dump function for spike to run ACT tests
• Add Ventana's Veyron V1 CPU

Fixes and Misc

• Fix invalid riscv,event-to-mhpmcounters entry
• Fix itrigger when icount is used
• Fix mstatus.MPP related support
• Fix the H extension TVM trap
• Restore the predicate() NULL check behavior

Device emulation and assignment

TPM

• Added TPM TIS I2C device model

Audio

• new PipeWire audio backend (-audiodev pipewire)

Character devices

• It's now possible to specify the input independently from the output with -chardev file (e.g. -chardev file,id=repro,path=/dev/null,input-path=input.txt)

Build Information

Build Dependencies

• Starting with QEMU 8.1, only Python 3.8 and newer will be supported (3.7 might work but it is not included in any of the environments that we run CI with).
• Either pip or ensurepip must be available, because pip is used to check the presence of Python build dependencies.
• It is recommended to install distlib as well when building QEMU, even though the build process tries to cope with its absence.
• new pipewire audio backend requires libpipewire (currently >= 0.3.60)

Known issues

• see Planning/8.1