QEMU 6.1 (virtualization)


QEMU is a free and open-source emulator and virtualizer that can perform hardware virtualization. 

QEMU is a hosted virtual machine monitor: it emulates the machine's processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it to run a variety of guest operating systems. It also can be used with Kernel-based Virtual Machine (KVM) to run virtual machines at near-native speed (by taking advantage of hardware extensions such as Intel VT-x). QEMU can also do emulation for user-level processes, allowing applications compiled for one architecture to run on another.

Released on Tuesday was QEMU 6.1.0-rc0 as the first test release working towards QEMU 6.1's stable debut before the end of August. QEMU 6.1 is another sizable feature release building off QEMU 6.0 that released at the end of April. QEMU remains an important piece of the Linux open-source virtualization stack and is also used on other platforms. 

With QEMU 6.1.0-rc0, QEMU 6.1 is now under a hard feature freeze and will see weekly release candidates until ready to ship. The current plan is that QEMU 6.1.0 will be ready by mid-to-late August. Among the changes coming with QEMU 6.1 are: 

  • Support on PowerPC for greatly increased maximum CPU count support that users are likely to hit other system limits before being restricted by QEMU.
  • RISC-V on QEMU has updates around OpenTitan platform support, support for VirtIO VGA, and a variety of other architecture improvements.
  • More work on POWER10 support within the Tiny Code Generator (TCG).
  • Emulation support of more Arm CPU features, including SVE2 and BFloat16 among others.
  • QEMU 6.1 on x86 adds new CPU model versions with XSAVES enabled, a new machine option to allow rate limiting bus locks by guests, and other changes.
  • QEMU's virtio-mem now works with VFIO.
  • Dropping of old CPU targets including Moxie, lm32, and unicore32. 

More details via the rc0 announcement and QEMU Wiki for the tentative change-log.

Here QEMU deals with the setting up and migration of KVM images. It is still involved in the emulation of hardware, but the execution of the guest is done by KVM as requested by QEMU.