ChangeLog/5.0

System emulation

Incompatible changes

• The bluetooth code has been removed without replacement. It was quite neglected over the years and likely not usable anymore. You can passthrough a dedicated USB bluetooth dongle to guests on most machines instead if you still need bluetooth in your guest.
• The -virtfs_synth option has been removed. You can use -fsdev synth together with -device virtio-9p-... instead.

New deprecated options and features

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

Arm

• The Cortex-M7 CPU is now supported
• New board: tacoma-bmc
• QEMU now correctly implements trapping of more EL1 system register accesses to EL2 (eg HCR_EL2 TID1, TID2 bits, HSTR_EL2)
• The no-op system registers required for a "trivial Jazelle" implementation have been added
• The DC CVAP and DC CVADP instructions are now supported

PowerPC

• pseries machine type
  • No longer require a reconfiguration reboot for a guest selecting XIVE interrupt controller when ic-mode=dual
  • Now consumes less host resources when running a KVM guest with XIVE (with a recent enough host kernel). This allows running more concurrent guests with KVM accelerated XIVE.
• powernv machine type
  • Numerous improvements to the model
  • Can now run KVM guests under a TCG emulated powernv machine
  • Basic POWER10 support

Guest agent

• The 'set-guest-time' command is now fenced off on systems that do not have the 'hwclock' command available (e.g. on s390x).

Known issues

• see Planning/5.0