This release includes initial support for LoongArch64 as well as CPU
architecture and driver emulation improvements for ARM, HPPA, Nios2,
OpenRISC, PowerPC, Renesas, s390, x86 and Xtensa.
Incompatible changes
The -enable-fips option to QEMU system emulators has been removed
The -writeconfig option to QEMU system emulators has been removed
The deprecated x86 CPU model Icelake-Client has been removed
The deprecated properties loaded (for crypto objects) and opened
(for RNG backends) are now read-only
The deprecated -soundhw option has been replaced by -audio
(e.g. -audio pa,model=hda)
The deprecated -sdl and -curses have been removed, use -display sdl
and -display curses instead.
The -display sdl,window_close=... suboption has been removed, use
-display sdl,window-close=... instead, i.e. with a minus instead of an
underscore between “window” and “close”
The -alt-grab option and the -display sdl,alt_grab=on suboption have been
removed, use -display sdl,grab-mod=lshift-lctrl-lalt instead.
The -ctrl-grab option and the -display sdl,ctrl_grab=on suboption have
been removed, use -display sdl,grab-mod=rctrl instead.
The x86 Icelake-Client CPU does not exist in the real world and has
therefore been removed.
The package changed with the addition of its libepoll-shim dependency.
Otherwise, we can get:
ERROR: libepoll-shim>=0.0.20210418 is not installed; can't buildlink files.
CHangelog:
== System emulation ==
=== Incompatible changes ===
Consult the [https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
=== New deprecated options and features ===
Consult the [https://qemu-project.gitlab.io/qemu/about/deprecated.html "Deprecated Features"] chapter of the QEMU System Emulation User's Guide for further details of the deprecations and their suggested replacements.
Additional note: The QEMU project currently considers to drop the slirp submodule in future releases, i.e. the QEMU tarball won't embed the code for user mode networking in the future anymore, so that an external libslirp installation is required. Most OS distribution already ship a libslirp package nowadays (except for OpenBSD which is already known and hopefully will be fixed soon), but if you are still using another OS distribution that does not provide a libslirp package yet, please send a note to the [[Contribute/MailingLists|qemu-devel mailing list]] and ask your OS vendor to include such a package in the next release.
=== 68k ===
=== Alpha ===
=== 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 or hvf and the host CPU supports it
* xlnx-versal-virt now emulates the PMC SLCR
* xlnx-versal-virt now emulates the OSPI flash memory controller
* xlnx-zynqmp now models the CRF and APU control
* The Arm GICv3 ITS now emulates the previously missing MOVI and MOVALL commands
* New board model: mori-bmc
* We now support emulating FEAT_LVA
* We now support emulating FEAT_LPA
* We now support emulating FEAT_LPA2. (Note that this is disabled by default for the 'virt' board's versioned machine types prior to 7.0 (ie 'virt-6.2', 'virt-6.1', etc) because Linux kernels prior to v5.12 have a bug which means they will not boot on a CPU which has LPA2.)
=== AVR ===
=== Hexagon ===
=== 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
=== Microblaze ===
=== MIPS ===
=== Nios2 ===
=== OpenRISC ===
==== Machines ====
* Support up to 4 cores up from 2 on the OpenRISC sim machine
* Support loading an external initrd image on the OpenRISC sim machine
* OpenRISC sim machine now automatically generates a device tree and passes it to the kernel
=== PowerPC ===
* Updates of PowerNV and pSeries documentation
==== Machines ====
* Deprecation of taihu machine
* Large rework of PPC405 machine
* General cleanup for Mac machines
* PowerNV PHB3/4 cleanups
* PowerNV XIVE improvements
* Extension of the powernv10 machine with XIVE2 ans PHB5 models
* New SLOF for PPC970 and POWER5+
* ppc: nested KVM HV for spapr virtual hypervisor
* spapr: nvdimm: Introduce spapr-nvdimm device
==== Extensions/removal====
* Removal of 401/403 CPUs
* Removal of 601/602 CPUs
* Removal of SoftTLBs support for PPC74x CPUs
* Initial support for PMU
* PMU EBB support
* Rework of powerpc exception handling
* Support for new ISA31 instructions
* Large cleanup of FPU implementation
==== Fixes ====
* Fixes for ivshmem
* Fixes for POWER5+ pseries
* Fixes for FPU exceptions
* Fixes for exception models in MPCx and 60x CPUs
* Fix for e6500 CPU
* Fixes for the 7448 CPU
* Exception and TLB fixes for the 405 CPU
* 603 CPUs fixes
* Book-E exception fixes
* Clang fixes
* VOF installation
* Radix MMU fixes
=== Renesas RX ===
=== Renesas SH ===
=== 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
* Support for svnapot, svinval and svpbmt extensions
* Experimental support for 128-bit CPUs
* Initial support for XVentanaCondOps custom extension
* stval and mtval support for illegal instructions
* Support for the UXL field in xstatus
* Add support for zfinx, zdinx and zhinx{min} extensions
==== 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
* Add AIA support for 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
* Fix trap cause for RV32 HS-mode CSR access from RV64 HS-mode
* Fixup OpenTitan SPI address
=== s390x ===
* Support Linux kernel command line length of more than 896 bytes (if the guest kernel supports it, too)
* Emulate the instructions from the "Miscellaneous-Instruction-Extensions Facility 3" (a z15 extension)
* Fixes for various emulated instructions (SLDA, SRDA, SLAG, BRASL, BRCL)
=== SPARC ===
=== Tricore ===
=== x86 ===
* Support for Intel AMX.
==== KVM ====
==== x86_64 ====
==== AMD SEV ====
=== Xtensa ===
=== Device emulation and assignment ===
==== ACPI / SMBIOS ====
* advertise i8042 in FADT if it is present (5334bf5703)
* new ''acpi-erst'' device, for logging guest evens using standard ACPI ERST interface (0ef0506e559)
* added support for new ''processor-id'' SMBIOS option (cb5fb04fe6)
* fixed SMBIOS memory handles overlap for large VMs (8Tb and more) (a379d4550c4)
* added 'SMBIOS 3.0' support in SeaBIOS, in QEMU it's opt-in feature, use ''-machine smbios-ep=3-0'' option to enable it
* fixed regression in ACPI table headers where OEM ID and OEM Table ID weren't padded correctly (748c030f360)
* fixed QEMU crash when started with user provided SLIC table (8cdb99af45)
* arm/virt: add VIOT table to describe virtio-iommu (cf1a5cc935c)
* x86: 'pc' machine type: fixed acpi-index not being migrated which might result in NIC name change if migration happens when guest is asking QEMU for it. Migration should work properly since 7.0 and newer machine types, for older machine types migration of acpi-index is broken and can't be fixed for compatibility reasons.
==== Audio ====
==== Block devices ====
==== Graphics ====
==== I2C ====
==== Input devices ====
==== IPMI ====
==== Multi-process QEMU ====
==== Network devices ====
==== NVDIMM ====
==== NVMe ====
===== Emulated NVMe Controller =====
==== PCI/PCIe ====
* Q35: fix PCIe device becoming disabled after migration when ACPI based PCI hotplug is used (6b0969f1ec)
* initial bits of SR/IOV support (250346169)
* arm/virt: fixed PXB interrupt routing (e609301b45)
* arm/virt: support for virtio-mem-pci (b1b87327a9)
==== SCSI ====
==== SD card ====
==== SMBIOS ====
==== TPM ====
==== USB ====
==== VFIO ====
==== virtio ====
==== Xen ====
==== fw_cfg ====
==== 9pfs ====
* [e64e27d5cb Fixed 9p server crash] ([https://gitlab.com/qemu-project/qemu/-/issues/841 issue #841]) that happened on some host systems due to incorrect (system dependant) handling of struct dirent size.
* [f45cc81911 Added support for macOS hosts].
==== virtiofs ====
* Fix for CVE-2022-0358 - behaviour with supplementary groups and SGID directories
* Improved security label support
* The virtiofsd in qemu is now starting to be deprecated; please start using and contributing to [https://gitlab.com/virtio-fs/virtiofsd Rust virtiofsd]
==== Semihosting ====
* We now generate sane numbers for SYS_HEAPINFO under system emulation
=== Audio ===
=== Character devices ===
=== Crypto subsystem ===
=== Authorization subsystem ===
=== GUI ===
* a new [https://www.qemu.org/docs/master/interop/dbus-display.html "-display dbus"] option to export the display for external processes. A [https://gitlab.com/marcandre.lureau/qemu-display/ gtk4-rs based widget] is in the works (for future Boxes, virt-viewer etc). Potential other users include remote desktop protocols.
=== GDBStub ===
=== TCG Plugins ===
* new coverage plugin in contrib which support drcov format traces
=== Host support ===
=== Memory backends ===
=== Migration ===
=== Monitor ===
==== QMP ====
==== HMP ====
=== Network ===
=== Block device backends and tools ===
* Fleecing backup has been made more flexible: Fleecing backup means exposing a temporary snapshot of an actively used image, and having the copy-before-write (CBW) filter (or historically the backup block job) copy data there from areas written by the guest to the active image, before they are overwritten, so that the snapshot keeps representing the point-in-time state of the disk when the snapshot was created. This snapshot can then be read (either by qemu itself using the backup or mirror block jobs, or by outside users e.g. via an NBD export) to create a backup. As of qemu 7.0, instead of reading the snapshot image directly, it can also be accessed through the new snapshot-access block driver, by installing such a node on top of the CBW filter. Doing so has some advantages over accessing the snapshot image directly; for example, the image can then be in any format (not just COW formats like qcow2), because the CBW filter keeps track of its allocation bitmap. Once an area has been backed up, users can send a discard request to mark it as done, so that the CBW filter will not potentially copy it to the snapshot image on a subsequent guest write. Furthermore, the CBW filter now has a bitmap parameter that allows limiting its scope as specified by the bitmap at the time the CBW filter node is created.
* 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'.
* The ''qemu-nbd'' program has gained a new ''--tls-hostname'' parameter to allow TLS validation against a different hostname, such as when setting up TLS through a TCP tunnel, and now supports TLS over Unix sockets.
* The SSH driver supports sha256 fingerprints with pre-blockdev command line configuration syntax.
* The SSH driver will print the actual fingerprint and its type when failing to validate a host key.
=== Tracing ===
=== Miscellaneous ===
* The -sandbox 'spawn' filter, will now correctly block use of the clone syscall for spawnnig processes, while allowing thread creation
* The -sandbox 'spawn' filter, will now entirely block use of the clone3 syscall entirely since there is no way to access its flags parameter from seccomp to distinguish thread vs process creation
* The -sandbox 'spawn' filter, will now block setns, unshare and execveat syscalls since they are not desired.
== User-mode emulation ==
* fixed a bug that caused issues mapping the ARM commpage on 32 bit builds
=== binfmt_misc ===
=== Hexagon ===
== TCG ==
User-mode emulation (linux-user, bsd-user) will enforce guest alignment constraints and raise SIGBUS to the guest program as appropriate.
=== ARM ===
Support for for ARMv4 and ARMv5 hosts has been dropped. These older Arm versions do not have support for misaligned memory access; such support was added to ARMv6. Since ARMv5 is quite old, it is presumed that such systems do not have sufficient RAM to even run QEMU, and so practically speaking no systems are impacted.
== Guest agent ==
* Support Windows 11 for <code>guest-get-osinfo</code> command
* Fix memory leaks in Windows <code>guest-get-fsinfo</code> command
== Build Information ==
=== Python ===
=== GIT submodules ===
=== Container Based Builds ===
* a large number of containers are now updated by lcitool
* TESTS and IMAGES environment variables can be used filter again when building against all docker targets
=== VM Based Builds ===
=== Build Dependencies ===
* xfs libraries are not needed anymore for build, since the only ioctl used by qemu which was defined there got local implementation. With this, --enable-xfsctl configure option is also gone.
=== Windows ===
=== Testing and CI ===
Tested on NetBSD-current/amd64 w/nvmm and macOS/aarch64 w/hvf.
pkgsrc note: Recent upstream changes seem to have unintentionally broken the
NetBSD usermode emulation. User-mode emulation is thus disabled until someone
fixes this. Hint: see qemu/bsd-user/freebsd commits by M. Warner Losh.
Changes:
m68k
Improved support for Apple's Nubus, including the ability to load
declaration ROMs and slot IRQ support
The macfb framebuffer device now supports the same video modes found
on a real Quadra 800
Arm
On macOS hosts with Apple Silicon CPUs we now support the 'hvf'
accelerator for running AArch64 guests
M-profile CPUs now emulate trapping on division by zero via CCR.DIV_0_TRP
The pl011 UART model now supports sending 'break'
The Fujitsu A64FX processor model is now supported in TCG ('-cpu a64fx')
The M-profile MVE extension is now supported, and enabled in the Cortex-M55
The deprecated machine names 'raspi2' and 'raspi3' have been removed;
use 'raspi2b' and 'raspi3b' instead
The 'virt' machine now supports an emulated ITS
New machine type: kudo-bmc
The xlnx-zcu102 and xlnx-versal-virt machines now support
BBRAM and eFUSE devices
The 'virt' machine now supports more than 123 CPUs in TCG emulation mode
The pl031 real-time clock device now supports sending RTC_CHANGE QMP events
PowerPC
Improved POWER10 support for the 'powernv' machine
Initial support for POWER10 DD2.0 CPU added
Added support for FORM2 PAPR NUMA descriptions in the "pseries" machine type
RISC-V
Add Zb[abcs] instruction support
Remove RVB support
Fixup virt flash node
Don't override users supplied ISA version
Fixup some CSR accesses
Fix an overflow in the SiFive CLINT
ePMP CSR address updates
SiFive PWM support
Support for RISC-V ACLINT
Support vhost-user and numa mem options on all boards
mstatus.SD bug fix for hypervisor extensions
OpenTitan fix for USB dev address
OpenTitan update to latest bitstream build
Remove the Ibex PLIC
Bug fix of setting mstatus_hs.[SD|FS] bits
Fixes for sifive PDMA
Mark shakti_c as not user creatable
Add support for the experimental J extension
Update the fmin/fmax handling
s390x
Improved storage key emulation
New gen16 CPU features are now enabled automatically
SPARC
Fix for booting sun4m machines with more than 1 CPU
x86
New Snowridge-v4 CPU model, with split-lock-detect feature disabled
KVM
Support for SGX in the virtual machine
New "hv-apicv" CPU property (aliased to "hv-avic")
AMD SEV
Measured launch with direct kernel boot is now possible
virtio
QEMU now fully supports guest memory dumps with virtio-mem.
QEMU now cleanly supports precopy/postcopy migration & background snapshots
9pfs
Fixed an occasional crash when handling 'Twalk' requests
Fixed sub-optimal I/O performance on guest
QMP
New event DEVICE_UNPLUG_GUEST_ERROR
Block device backends and tools
qemu-nbd now defaults to writeback caching
qemu-nbd now has a --selinux-label option for Unix socket label
TCG
plugins now have a bool arg parsing helper and cleaned up argument syntax
the cache plugin is now multi-core aware
* 6.1.0 release has NetBSD NVMM support.
* Fix NetBSD NVMM compile errors.
* Remove integrated Alpha patches.
Changelog:
Highlights include:
* block: support for changing block node options after creation via
'blockdev-reopen' QMP command
* Crypto: more performant backend recommendations and improved documentation
* I2C: emulation support for I2C muxes (pca9546, pca9548) and PMBus
* TCG Plugins: now enabled by default, with new execlog and cache modelling
plugins.
* ARM: new board support for Aspeed (rainier-bmc, quanta-q7l1), npcm7xx
(quanta-gbs-bmc), and Cortex-M3 (stm32vldiscovery) based machines
* ARM: Aspeed support of Hash and Crypto Engine
* ARM: emulation support for SVE2 (including bfloat16), integer matrix
multiply accumulate operations, TLB invalidate in Outer Shareable domain,
TLB range invalidate, and more.
* PowerPC: pseries: support for detecting hotplug failures in newer guests
* PowerPC: pseries: increased maximum CPU count
* PowerPC: pseries: emulation support for some POWER10 prefixed instructions
* PowerPC: new board support for Genesi/bPlan Pegasos II (pegasos2)
* RISC-V: updates to OpenTitan platform support, including OpenTitan timer
* RISC-V: support for virtio-vga
* RISC-V: documentation improvements and general code cleanups/fixes
* s390: emulation support for the vector-enhancements facility
* s390: support for gen16 CPU models
* x86: new Intel CPU model versions with support for XSAVES instruction
* x86: added ACPI based PCI hotplug support for Q35 machine (now the default)
* x86: improvements to emulation of AMD virtualization extensions
* and lots more...
qemu-system-alpha where FEN traps were never generated. Fixes
a whole slew of FP-related problems on NetBSD/alpha running in
Qemu (including a broken jot(1)).
Bump package version to qemu-6.0.0nb2.
* Add zstd dependency.
Changelog:
== System emulation ==
=== Incompatible changes ===
Consult the [https://qemu-project.gitlab.io/qemu/system/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
* The deprecated ''pc-1.0'', ''pc-1.1'', ''pc-1.2'' and ''pc-1.3'' machine types have been removed (they likely could not be used for live migration from old QEMU versions anymore anyway). Use a newer ''pc-i440fx-...'' machine type instead.
* TileGX emulation has been removed without replacement
* The ''change'' QMP command has been removed. Use ''blockdev-change-medium'' or ''change-vnc-password'' instead.
* The ''-show-cursor'' option has been removed. Use ''-display sdl,show-cursor=on'' instead.
* The ''-realtime'' option has been removed. Use ''-overcommit mem-lock=on|off' instead.
* The ''-tb-size'' option has been removed. Use ''-accel tcg,tb-size=...'' instead.
* The configure script --enable/disable-git-update args have been replaced with --with-git-submodules
* The ''-usbdevice audio'' option has been removed. Use ''-device usb-audio'' instead.
* The ''-usbdevice ccid'' option has been removed with no replacement
* The ''-vnc'' parameter ''acl'' option, and ''acl_*'' monitor commands have been removed.
* The ''pretty'' option is no longer accepted when used with the human monitor
* The ''change'' QMP command has been removed. Use ''blockdev-change-medium'' or ''change-vnc-password'' instead.
* The ''query-events'' QMP command has been removed
* The ''migrate_set_speed'', ''migrate_set_downtime'' and ''migrate-set-cache-size'' QMP/HMP commands have been removed.
* The ''query-cpus'' QMP command has been removed
* The ''arch'' field in the ''query-cpus-fast'' command has been removed
* The ''-chardev'' parameter ''wait'' option is no longer accepted for socket clients
* The ''ide-drive'' device type has been removed
* The ''scsi-disk'' device type has been removed
* The ''encryption_key_missing'' field has been removed from block device info data
* The ''status'' field has been removed from dirty bitmap info
* The ''dirty-bitmaps'' field has been removed from the ''BlockInfo'' struct
* The ''file'' block driver no longer permits use with block devices
* The use of ''-global'' to set floppy controllers is removed. Use ''-device floppy,...'' instead.
* The ''-drive'' option must now use ''if=none'' for drives the onboard device does not pick up.
* The ''object-add'' QMP command member ''props'' has been removed. Its contents may be used with less nesting instead.
* The mips ''fulong2e'' machine alias has been removed. Use ''fuloong2e'' instead.
=== New deprecated options and features ===
Consult the [https://www.qemu.org/docs/master/system/deprecated.html "Deprecated Features"] chapter of the QEMU System Emulation User's Guide for further details of the deprecations and their suggested replacements.
* The --enable-fips option has been deprecated. Consumers wishing to have FIPS compliance must build QEMU with libcrypt and gnutls, NOT nettle.
* The ''-writeconfig'' option has been deprecated. The functionality of ''-writeconfig'' is limited and the code does not even try to detect cases where it prints incorrect syntax (for example if values have a quote in them). It will be removed without replacement.
* Boolean parameters such as ''share=on'' / ''share=off'' could be written in short form as ''share'' and ''noshare''. This is now deprecated and will cause a warning.
* ''-chardev'' backend aliases ''tty'' and ''parport'' are aliases that will be removed. Instead, the actual backend names ''serial'' and ''parallel'' should be used.
* The ''delay'' option for socket character devices is now deprecated.
* Userspace local APIC with KVM (''-M kernel-irqchip=off'')
* hexadecimal sizes with scaling multipliers (e.g. ''0x20M'')
* ''-spice password=string'' is deprecated now. Use ''password-secret'' option instead.
* ''opened'' property of ''rng-*'' objects
* ''loaded'' property of ''secret'' and ''secret_keyring''
* MIPS ''Trap-and-Emulate'' KVM support
=== 68k ===
* Add a new machine, virt, based on virtio devices
=== Alpha ===
=== Arm ===
* QEMU now supports emulation of the Arm-v8.1M architecture and the Cortex-M55 CPU
* Emulation of the ARMv8.4-TTST extension is now supported
* Emulation of the ARMv8.4-SEL2 extension is now supported
* Emulation of the FEAT_SSBS extension is now supported
* Emulation of the PAuth extension now supports an optional IMPDEF pauth algorithm which is not cryptographically secure but is much faster to compute
* Emulation of the ARMv8.4-DIT extension is now supported. (Note that QEMU's implementation does not in fact provide any timing guarantees; emulation of the extension is purely to support guests which query its presence and work with the PSTATE.DIT bit.)
* Emulation of the ARMv8.5-MemTag extension is now supported for linux-user. (It was already supported for system emulation.)
* xlnx-zynqmp boards now support the Xilinx ZynqMP CAN controllers
* the sbsa-ref board now supports Cortex-A53/57/72 cpus
* the xlnx-versal board now has USB support, and a model of the XRAMs and the XRAM controller
* the sabrelite board emulation has been improved and it can now run U-Boot
* the npcm7xx boards support more devices: ADC, PWM, SMBus, EMC, MFT
* the gdbstub's representation of SVE registers allows GDB to properly handle aliasing
* the 'virt' board now provides a mechanism for secure (EL3) firmware to power down or reset the system
* documentation for vexpress/versatile has been updated with example kernel configuration/command lines
* A new board model mps3-an524 (using Cortex-M33) is now implemented
* A new board model mps3-an547 (using Cortex-M55) is now implemented
=== AVR ===
=== Hexagon ===
* QEMU can now emulate Qualcomm's Hexagon DSP units.
=== HPPA ===
=== Microblaze ===
=== MIPS ===
* Loongson-3 "virt" machine added
=== Nios2 ===
=== OpenRISC ===
=== PowerPC ===
* Deprecated 'compat' property of server class POWER cpus removed (use the 'max-cpu-compat' machine option instead)
* You can now explicitly choose 'kvm_type=auto' rather than only being able to do that by not setting it at all.
* powernv machine type now defaults to 1GiB of RAM
* powernv now allows an external BMC
* pseries will now send MEM_UNPLUG_ERROR QAPI message in cases where it can detect that a memory unplug has failed
* pseries will now allow cpu unplug requests to be retried, even if the guest hasn't responded to them yet.
* This will re-signal the guest, which might an unplug to complete which the guest previous rejected
=== Renesas RX ===
=== Renesas SH ===
=== RISC-V ===
* Improve the sifive_u DTB generation
* Add QSPI NOR flash to Microchip PFSoC
* Improvements to the Microchip PFSoc to improve support with the SDK
* A range of fixes to the Hypervisor extension
* Fix some mstatus mask defines
* Ibex PLIC and UART improvements
* OpenTitan memory layout update (Breaking change)
* Initial steps towards support for 32-bit CPUs on 64-bit builds
* Automate GDB XML generation (should fix GDB E14 errors)
* Sifive OTP handle OTP access failures
* Correctly generate a PMP failure when no PMP entry is configured
* Fixes to PMP region checking
* Fix 32-bit Linux boot problems with DTB placement
* OpenSBI upgraded to v0.9
* Support the QMP dump-guest-memory command
* Add support for the SiFive SPI controller (sifive_u)
* Initial RISC-V system documentation
* Support for high PCIe memory in the virt machine
* Fixes to the vector extensions CSR accesses
* ramfb support in the virt machine
=== s390 ===
* Linux kernels built with clang-11 and clang-12 now work correctly under tcg
=== SPARC ===
=== TileGX ===
* TileGX has been removed without replacement.TileGX was only implemented in linux-user mode, but support for this CPU was removed from the upstream Linux kernel in 2018, and it has also been dropped from glibc, so there is no new Linux development taking place with this architecture, rendering the linux-user mode emulation rather useless. For running older binaries, users can simply use older versions of QEMU.
=== Tricore ===
* Added Triboard with tc27x SoC
=== x86 ===
* TCG can emulate the PKS feature (protection keys for supervisor pages).
* Intel PT can now be exposed to KVM guests when <code>CPUID.(EAX=14,ECX=0).ECX[LIP]</code> (bit 31) is 1. Previous versions only supported Intel PT when LIP=0
* New <code>sev-inject-launch-secret</code> QMP command
* The WHPX accelerator supports accelerated APIC ("-accel whpx,kernel-irqchip=on")
* The microvm machine type got a second (optional) ioapic for the virtio-mmio irq lines, which in turn allows 24 (instead of 8) virtio-mmio devices.
* Support for running SEV-ES encrypted guests.
=== Xtensa ===
=== Device emulation and assignment ===
==== ACPI ====
* new ''-machine'' options ''oem-id'' and ''oem-table-id'' to allow setting custom values for ''OEM ID'' and ''OEM table ID'' ACPI table fields
* in QEMU 5.1, PCI root UID changed to from 1 to 0 for all x86 machine types, this caused issues in Windows guest with virtio devices being re-enumeraed as new devices. QEMU 6.0 fixes it by reverting UID to 1 for 5.1 and older machine types. See commit 0a343a5add75 for details. For 5.2 and later machine types it might be necessary to reconfigure/reinstall Windows VM, if used disk image was created on 5.1 and older machine types.
* Support for user provided PCI NIC index on ''pc'' machine type with help of new ''acpi-index'' PCI device option. For linux guests, It lets user to use ''onboard'' naming scheme ''enoX'' where X is set with ''acpi-index'' option. It makes NIC naming independent from which PCI slot it is plugged in. Works with cold and hot-plugged NICs, as long as used PCI bus is managed by ACPI PCI hotplug (which is enabled for PCI root bus and bridges present at boot time by default on latest ''pc'' machine type ).
==== Audio ====
==== Block devices ====
* virtio-blk reports <tt>--device virtio-blk-pci,discard_granularity=</tt> in the virtio-blk <tt>discard_sector_alignment</tt> configuration space field so that guests with new machine types can take advantage of this information. Previously virtio-blk devices reported <tt>--device virtio-blk-pci,logical_block_size=</tt> instead.
==== Graphics ====
==== Input devices ====
==== IPMI ====
==== Multi-process QEMU ====
* The experimental <code>-machine x-remote</code> and <code>-device x-pci-proxy-dev</code> options have been added to support out-of-process device emulation. Currently only the <code>lsi53c895</code> SCSI device can be emulated in a separate process. Please see [https://qemu.readthedocs.io/en/latest/system/multi-process.html the documentation] and [[Features/MultiProcessQEMU]] for details on this experimental feature, which is still subject to change.
==== Network devices ====
==== NVDIMM ====
* nvdimm devices will check that <code>-device nvdimm,unarmed=on</code> option is used when using <code>-object memory-backend-file,readonly=on</code>
==== NVMe ====
===== Emulated NVMe Controller =====
* ''Highlights''
** The implemented spec version has been bumped to v1.4
** Experimental support for Zoned Namespaces (TP 4053) has been added
** Experimental support for NVM Subsystems, multipath I/O and namespace sharing
** Experimental support for Metadata and End-to-End Data Protection
* ''New commands''
** Dataset Management
** Compare
** Simple Copy (TP 4065)
** Format NVM
** Verify
* ''Other new features''
** Support for reporting the Deallocated or Unwritten Logical Block Error (DULBE)
** Namespace UUID reported as a Namespace Descriptor
** Support for Namespace Types (TP 4056)
** Support for triggering a SMART Critical Warning through QMP
** Controller Memory Buffer support has been enhanced for NVMe v1.4 (to revert to v1.3 behavior, use the new <code>legacy-cmb</code> controller parameter)
** Persistent Memory Region RDS/WDS support
* ''New log pages''
** Commands Supported and Effects
==== PCI/PCIe ====
* The 'pvpanic-pci' device is a PCI-device version of the 'pvpanic' ISA device, which can be used on systems with only PCI and no ISA bus as a mechanism for the guest to inform QEMU that it has paniced.
==== SCSI ====
* Rework of the ESP SCSI emulation to allow mixed FIFO/(P)DMA commands along with various other fixes
==== SD card ====
==== SMBIOS ====
==== TPM ====
==== USB ====
* Support for writing usb traffic to package capture files for inspection with wireshark has been added. Use the new pcap=<file> property added to all usb devices to enable this.
==== VFIO ====
==== virtio ====
==== Xen ====
* A new [https://qemu.readthedocs.io/en/latest/system/guest-loader.html guest loader] which allows testing of Xen-like hypervisors booting kernels without messing around with firmware/bootloaders
==== fw_cfg ====
==== 9pfs ====
==== virtiofs ====
* Security fix for CVE-2020-35517 - prevent opening of special files
* Security fix for CVE-2021-20263 - when used with xattrmap, drop remapped security.capability
* Performance improvements with new guest kernel feature FUSE_KILLPRIV_V2
==== Semihosting ====
* Added support for RiscV (ARM style s= Character devices ===
=== Crypto subsystem ===
==== experimental qmp interface ====
=== GUI ===
* vnc: support for cursors with alpha channel has been added.
* vnc: support for extended desktop resize has been added. With virtio-vga the guest displab representation for SVE registers
=== TCG Plugins ===
* New API for querying details about HW access
* Bug fix to avoid double counting some instructions when using -icount
=== Host support ===
=== Memory backends ===
* hostmem-file: added readonly=lation to NBD_STATE_HOLE.
* ''qemu-img'' gained more accurate parsing for size values. Previously, only 53 significant digits were supported, and large sizes could end up with inadvertent rounding; now the parser supports a full 64 bits of precision.
* The ''object-add'' QMP command is now available in qemu-storage-daemon.
* qemu-storage-daemon supports a ''--pidfile'' option now
* The ''parallels'' image format driver has gained support for dirty bitmaps in read-only mode
=== Tracing ===
=== Miscellaneous ===
* The command line option ''-object'' (or ''--object'') accepts JSON input now in all binaries (system emulators and tools). In tools, it also supports non-scalar options using the dotted key syntax known from options like ''--blockdev''.
* The QMP command ''object-add'' is now covered by the QAPI schema and clients can use schema introspection to detect object types and options supported by the given QEMU binary.
* A new command line option ''-action'', with suboptions ''panic'', ''shutdown'', ''reboot'' and ''watchdog''. ''-action'' subsumes the pre-existing options ''-no-shutdown'' (''-action panic=pause,shutdown=pause''), ''-no-reboot'' (''-action reboot=shutdown'') and ''-watchdog-action''; plus, it allows the user to choose whether guest panic should pause the guest (''-action panic=pause''), shut it down (''-action panic=poweroff'', the default) or be ignored (''-action panic=none'').
* A new generic machine option ''confidential-guest-support'' was added to (partially) unify configuration for AMD SEV memory encrypt, POWER PEF and s390 Protected Virtualization, plus future methods of protecting a guest from eavesdropping by a compromised hypervisor.
* A new [https://qemu.readthedocs.io/en/latest/system/guest-loader.html guest loader] whications.
== User-mode emulation ==
=== binfmt_misc ===
Added support of 'P' flag (preserve-argv[0])
With kernel v5.12, QEMU can detect if it is started with preserve-argv[0] flag and adjust the list of arguments accordingly.
=== Hexagon ===
Added support for the Qualcomm Hexagon processor, in linux-user mode only.
For more information, see [https://www.youtube.com/watch?v=3EpnTYBOXCI our presenation from the 2019 KVM Forum]
or the [https://github.com/qemu/qemu/blob/master/target/hexagon/README README] file
== TCG ==
* Added support for Apple Silicon hosts (macOS)
after advancing the PC past the faulting instruction as defined by the
architecture spec, actually store it in the stack frame passed to the
operating system.
Fixes the difference in behavior between Qemu and real hardware in
PR bin/56198.
