ChangeLog/7.0

System emulation

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.

Arm

• The virt board has gained a new control knob to disable passing a RNG seed in the DTB (dtb-kaslr-seed)
• The AST2600 SoC now supports a dummy version of the i3c device
• The virt board can now run guests with KVM on hosts with restricted IPA ranges
• The virt board now supports virtio-mem-pci
• The virt board now supports specifying the guest CPU topology
• On the virt board, we now enable PAuth when using KVM and the host CPU supports it
• xlnx-versal-virt now emulates the PMC SLCR
• xlnx-versal-virt now emulates the OSPI flash memory controller
• The Arm GICv3 ITS now emulates the previously missing MOVI and MOVALL commands

HPPA

• Support up to 16 virtual CPUs
• Improved artist graphics driver for HP-UX VDE, HP-UX CDE and Linux framebuffer
• Mouse cursor focus and positioning now works much better under HP-UX X11
• Emulated TOC button can be triggered with "nmi" in the qemu monitor
• Added support for Qemu SCSI boot order option
• Possibility to change system HOSTID for HP-UX and Linux
• Added firmware 16x32 pixel bitmap font for use on HDPI screens
• Ability to choose serial or graphical console as default firmware console

RISC-V

Extensions

• Add support for ratified 1.0 Vector extension
• Support for the Zve64f and Zve32f extensions
• Drop support for draft 0.7.1 Vector extension
• Support Zfhmin and Zfh extensions
• RISC-V KVM support
• Mark Hypervisor extension as non experimental
• Enable Hypervisor extension by default
• Experimental support for 128-bit CPUs
• stval and mtval support for illegal instructions
• Support for the UXL field in xstatus

Machines

• OpenSBI binary loading support for the Spike machine
• Improve kernel loading for non-Linux platforms
• SiFive PDMA 64-bit support
• Support 32 cores on the virt machine

Fixes

• Fix illegal instruction when PMP is disabled
• Corrections for the Vector extension
• Fixes for OpenTitan timer
• Correction of OpenTitan PLIC stride length
• Removal of OpenSBI ELFs

Device emulation and assignment

virtiofs

• Fix for CVE-2022-0358 - behaviour with supplementary groups and SGID directories

TCG Plugins

• new coverage plugin in contrib which support drcov format traces

Block device backends and tools

• A bug in caching block status has been fixed that was causing over-eager treatment of a format layer as all data rather than detecting holes, if an earlier block status query had merely been checking for which portions of the backing chain were allocated. While the bug did not affect guest-visible data, it caused some performance regressions, particularly noticeable and easy to trigger when using 'qemu-nbd --allocation-depth'.

User-mode emulation

• fixed a bug that caused issues mapping the ARM commpage on 32 bit builds

Guest agent

• Support Windows 11 for guest-get-osinfo command
• Fix memory leaks in Windows guest-get-fsinfo command

Build Information

Container Based Builds

• a large number of containers are now updated by lcitool

Known issues

• see Planning/7.0