ChangeLog/5.1: Difference between revisions

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(→‎Block device backends and tools: zstd compression for qcow2 images)
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=== Block device backends and tools ===
=== Block device backends and tools ===
* Optional zstd compression for qcow2 (enable with <code>compression_type=zstd</code> as a creation option)


=== Tracing ===
=== Tracing ===

Revision as of 12:02, 14 May 2020

System emulation

Incompatible changes

New deprecated options and features

Consult the "Deprecated Features" chapter of the QEMU System Emulation User's Guide for the full list of historically deprecated features/options.

Alpha

68k

Arm

  • Emulation of the following architecture features is now implemented:
    • ARMv8.2-TTS2UXN
  • xlnx-versal-virt: machine now supports RTC and SD

HPPA

Microblaze

MIPS

Nios2

OpenRISC

PowerPC

  • The "label-size" property is now mandatory for NVDIMMs on the "pseries" machine type (the PAPR specification only supports labelled NVDIMMs)
  • NVLink2 devices can no longer be unplugged. This is not possible on real hardware, and was never supported by the guest side drivers, so this makes things safer.
  • We no longer use reconfiguration reboots to handle difficult cases during CAS option negotiation
  • Added an interface to inject POWER style NMIs

RISC-V

  • Spike machine supports more then 1 CPU
  • Spike machine supports the `-bios` option
  • OpenSBI updated to v0.7
  • linux-usermode improvements
  • Support for the SiFive E34 CPU
  • 32-bit improvements for the `sifive_u` machine
  • Corrections to the Hypervisor extension page table walking
  • Expose a "serial" property for the `sifive_u` machine that specifys the board serial number

s390

  • Support for protected virtualization aka secure execution has been merged (KVM only)
    • The host needs to be a z15 or Linux One III with at least Linux 5.7

SH

SPARC

TileGX

Tricore

x86

Xtensa

Device emulation and assignment

ACPI

  • QEMU now exposes a WAET (Windows ACPI Emulated Devices Table) to guests -

this reduces virtualization overhead for non-enlightened windows (Vista and later) guests by avoiding guest workarounds for an unreliable ACPI PM timer.

  • QEMU now supports both cold and hot plug of nvdimms for ARM Guests with ACPI.

Audio

Block devices

Graphics

Input devices

IPMI

Network devices

NVDIMM

PCI/PCIe

Attempts to hotplug devices into a pci slot with hotplug disabled will now return an error instead of adding the device without notifying the guest.

SCSI

SMBIOS

TPM

USB

VFIO

virtio

Xen

fw_cfg

9pfs

virtiofs

  • virtiofsd:
    • Security fix: CVE-2020-10717, resource exhaustion of host fd's
    • Jailing improvements
    • Ensure that existing mounts under the shared directory are visible to the guest

Semihosting

Audio

Character devices

Crypto subsystem

GUI

GDBStub

  • bug fix to m68k gdbstub
  • linux-user now supports unix socket for debugging (needs a new gdb)
  • some tests for the stub added to check-tcg

Host support

Memory backends

QMP

Migration

Network

Block device backends and tools

  • Optional zstd compression for qcow2 (enable with compression_type=zstd as a creation option)

Tracing

Miscellaneous

User-mode emulation

TCG

Guest agent

Build Information

Python

GIT submodules

Container Based Builds

Build Dependencies

Testing

Windows

Known issues