ChangeLog/4.1: Difference between revisions

From QEMU
(→‎Block devices and tools: qemu-nbd --pid-file)
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* <code>qemu-img rebase</code> works now even when the input file doesn't have a backing file yet
* <code>qemu-img rebase</code> works now even when the input file doesn't have a backing file yet
* The backup block job now accepts any source node
* The backup block job now accepts any source node
* <code>qemu-nbd</code> now supports a --pid-file option, writing its pid into that file after other initialization is complete


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

Revision as of 18:01, 13 June 2019

System emulation

Incompatible changes

New deprecated options and features

  • The "-virtfs_synth" option is now deprecated. Please use "-fsdev synth" and "-device virtio-9p-..." instead.

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

Alpha

68k

Arm

  • QEMU now supports emulating an FPU for Cortex-M CPUs, and the Cortex-M4 and Cortex-M33 now provide the FPU.
  • The build config files have been switched to the new Kconfig system, so that a QEMU with individual boards can be built more easily.
  • The ARMv8.5-RNG extension is supported, for cpu generated random numbers.
  • The Exynos4210 SoC model now supports the PL330 DMA controllers.
  • Some bugs in handling of GICv3 ICC_CTLR_EL3 and ICH_VMCR_EL2 register writes have been fixed.

HPPA

Microblaze

MIPS

  • Marking referenced memory pages as executable is improved (it is restricted to necessary cases only).
  • Emulation of MSA ASE instructions on big endian hosts is fixed for instructions LD.<B|H|W|D>, ST.<B|H|W|D>, COPY_S.<B|H|W|D>, COPY_U.<B|H|W>, and INSERT.<B|H|W|D>.
  • The 'division by zero' cases in MSA ASE instructions DIV_<U|S>.<B|H|W|D> and MOD_<U|S>.<B|H|W|D> are now handled in QEMU and on the reference hardware the same way.

Nios2

OpenRISC

PowerPC

  • NVIDIA V100 GPU/NVLink2 passthrough for spapr using VFIO PCI
  • The TCG implementation of the Power9 DARN instruction now produces random numbers, instead of indicating failure.
  • pseries machine now supports KVM acceleration (kernel_irqchip=on) of the XIVE interrupt controller
  • pseries now defaults to XIVE interrupt controller if using pseries-4.1 machine version, POWER9 cpu and a guest OS which supports it


RISC-V

  • Arbitrary bits in SIP can no longer be set.
  • A new "spike" machine has been defined, with the old machines being deprecated.
  • sfence.vma can no longer execute from userspace.
  • Single-stepping over branches and jumps now works.
  • A handful of illegal instructions (all compressed) are now handled correctly, as opposed to being treated as NOPs.

s390

  • The bios now supports IPL (boot) from ECKD DASD assigned to the guest via vfio-ccw.
  • The bios now tolerates the presence of bootmap signature entries written by zipl.
  • All Vector Instructions introduced with the "Vector Facility" have been implemented for TCG.
    • The "Vector Facility" is now indicated in the "qemu" cpu model, which has been updated to a stripped-down z13.
  • More facilities and gen15 machines (official name not yet known) have been added to the cpu model.

SH

SPARC

TileGX

Tricore

x86

  • New Hygon Dhyana CPU model
  • The host-cache-info CPU option now affects the TOPOEXT CPUID leaf (0x8000001D)
  • The RDRAND extension is implemented for TCG.

Xtensa

Device emulation and assignment

ACPI

Audio

Block devices

GPIO

  • SiFive's GPIO controller is now supported.

Graphics

Input devices

IPMI

Network devices

NVDIMM

PCI/PCIe

SCSI

SMBIOS

TPM

USB

VFIO

virtio

Xen

fw_cfg

9pfs

Semihosting

  • semihosting output can now be redirected to a chardev backend with -semihosting-config enable=on,target=native,chardev=[ID]

Audio

Character devices

Crypto subsystem

GUI

  • virtio-gpu 2d/3d rendering may now be offloaded to an external vhost-user process, such as QEMU vhost-user-gpu. Use vhost-user-vga & vhost-user-gpu-pci for associated devices. See patch series.

Host support

Memory backends

  • QEMU will automatically try to use the MAP_SYNC mmap flag for memory backends configured with pmem=on,share=on

Monitor

Migration

Network

Block devices and tools

  • qemu-img rebase works now even when the input file doesn't have a backing file yet
  • The backup block job now accepts any source node
  • qemu-nbd now supports a --pid-file option, writing its pid into that file after other initialization is complete

Tracing

Miscellaneous

  • Unless QEMU is configured with --disable-blobs, make install will install UEFI platform firmware binaries, and matching variable store templates, at $prefix/share/qemu/edk2-*.fd.
    • These files are built from the edk2 project's ArmVirtPkg and OvmfPkg firmware platforms, and the edk2 project's OpenSSL submodule.
    • They are documented (and exposed to virt management applications) through JSON files in $prefix/share/qemu/firmware/.
    • The schema definition for the JSON descriptors is located at docs/interop/firmware.json in the QEMU source tree.

User-mode emulation

Alpha

TCG

  • aarch64 and alpha softmmu test harnesses have been added
  • gdbstub now supports custom gdb maint packet support for physical address mode

Guest agent

Build Information

The configure argument --source-path has been removed. This argument used to be provided to allow the user to specify that the source tree was in a different location from the configure script itself. This odd way of building is no longer supported, and we always assume that the source tree is where the configure script is. (Note that a separate build tree is still permitted -- the build tree is the working directory in which configure is run.)

Python

  • Build and test scripts will now use the python3 binary by default if available

GIT submodules

Build Dependencies

Known issues