ChangeLog/5.1

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Revision as of 09:32, 3 June 2020 by Dwg (talk | contribs) (→‎PowerPC)

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
  • New board model: sonorapass-bmc
  • Host memory errors can now be reported to AArch64 KVM guests via ACPI when using the 'virt' board (this is disabled by default; enable with '-machine ras=on')
  • All the imx6 and imx7 machines now support the watchdog timer device

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
  • scv and rfscv instructions now supported in TCG

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

  • Add gdb stub
  • Fix segfault due to uninitialized ctx->env ptr

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

  • The 'socket' backend now supports the abstract namespace for UNIX sockets, with the new 'abstract' and 'tight' options

Crypto subsystem

GUI

  • Windows keyboard fixes for GTK and SDL

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

  • Migration of block dirty bitmaps when not using -blockdev now avoids using generated node names; without this fix, a migration attempt that included bitmaps and was attempted while a mirror job was active (which was a common scenario with older libvirt that did not use -blockdev but set up an NBD mirror for storage migration in parallel) would generally fail due to the difference in generated node names between the source and destination.

Network

Block device backends and tools

  • Optional zstd compression for qcow2 (enable with compression_type=zstd as a creation option)
  • Fixed regression with 'qemu-nbd -c /dev/nbd0' keeping inherited stderr open (introduced in 4.1)
  • 'qemu-img map' gained --start-offset and --max-length options for mapping only a subset of a file
  • 'qemu-img' gained a new command mode 'bitmap' for manipulating persistent bitmaps in qcow2 files
  • 'qemu-img measure' now reports the space occupied by persistent bitmaps in qcow2 files
  • 'qemu-img convert' gained a new --bitmaps option for convenience in copying bitmaps alongside guest-visible content of qcow2 files

Tracing

Miscellaneous

User-mode emulation

TCG

Guest agent

Build Information

Python

GIT submodules

Container Based Builds

  • Updated aarch64 container for bullseye based compiler for testing newer features

Build Dependencies

  • Now requires GTK 3.22 or newer

Testing

  • vm-build tests can now use alternatives to genisoimage (cdrkit)

Windows

Known issues