QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org
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Stefan Hajnoczi 96215036f4 * futex: support Windows
* qemu-thread: Avoid futex abstraction for non-Linux
 * migration, hw/display/apple-gfx: replace QemuSemaphore with QemuEvent
 * rust: bindings for Error
 * hpet, rust/hpet: return errors from realize if properties are incorrect
 * rust/hpet: Drop BqlCell wrapper for num_timers
 * target/i386: Emulate ftz and denormal flag bits correctly
 * i386/kvm: Prefault memory on page state change
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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* futex: support Windows
* qemu-thread: Avoid futex abstraction for non-Linux
* migration, hw/display/apple-gfx: replace QemuSemaphore with QemuEvent
* rust: bindings for Error
* hpet, rust/hpet: return errors from realize if properties are incorrect
* rust/hpet: Drop BqlCell wrapper for num_timers
* target/i386: Emulate ftz and denormal flag bits correctly
* i386/kvm: Prefault memory on page state change

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# gpg: Signature made Fri 06 Jun 2025 08:33:12 EDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (31 commits)
  tests/tcg/x86_64/fma: add test for exact-denormal output
  target/i386: Wire up MXCSR.DE and FPUS.DE correctly
  target/i386: Use correct type for get_float_exception_flags() values
  target/i386: Detect flush-to-zero after rounding
  hw/display/apple-gfx: Replace QemuSemaphore with QemuEvent
  migration/postcopy: Replace QemuSemaphore with QemuEvent
  migration/colo: Replace QemuSemaphore with QemuEvent
  migration: Replace QemuSemaphore with QemuEvent
  qemu-thread: Document QemuEvent
  qemu-thread: Use futex if available for QemuLockCnt
  qemu-thread: Use futex for QemuEvent on Windows
  qemu-thread: Avoid futex abstraction for non-Linux
  qemu-thread: Replace __linux__ with CONFIG_LINUX
  futex: Support Windows
  futex: Check value after qemu_futex_wait()
  i386/kvm: Prefault memory on page state change
  rust: make TryFrom macro more resilient
  docs: update Rust module status
  rust/hpet: Drop BqlCell wrapper for num_timers
  rust/hpet: return errors from realize if properties are incorrect
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
1 day ago
.github/workflows github: fix config mistake preventing repo lockdown commenting 3 years ago
.gitlab/issue_templates .gitlab/issue_templates: Move suggestions into comments 3 years ago
.gitlab-ci.d rust: add qemu-api doctests to "meson test" 4 days ago
accel i386/kvm: Prefault memory on page state change 1 day ago
audio audio: Reset rate control when adding bytes 2 weeks ago
authz qom: Make InterfaceInfo[] uses const 1 month ago
backends vfio/iommufd: Add properties and handlers to TYPE_HOST_IOMMU_DEVICE_IOMMUFD 2 days ago
block block/io: remove duplicate GLOBAL_STATE_CODE() in bdrv_do_drained_end() 3 days ago
bsd-user bsd-user: add option to enable plugins 1 month ago
chardev qom: Have class_init() take a const data argument 1 month ago
common-user common-user/host/riscv: use tail pseudoinstruction for calling tail 3 weeks ago
configs * target/i386/kvm: Intel TDX support 1 week ago
contrib contrib/plugins: Fix type conflict of GLib function pointers 1 month ago
crypto crypto: fully drop built-in cipher provider 2 weeks ago
disas include/system: Move exec/memory.h to system/memory.h 1 month ago
docs * futex: support Windows 1 day ago
dump cleanup: Drop pointless return at end of function 1 month ago
ebpf ebpf: improve trace event coverage to all key operations 7 months ago
fpu fpu: Build only once 3 months ago
fsdev 9pfs: Introduce futimens file op 1 month ago
gdb-xml target/i386/gdbstub: Expose orig_ax 8 months ago
gdbstub meson: remove lib{system, user}_ss aliases 2 weeks ago
host/include host/include/loongarch64: Fix inline assembly compatibility with Clang 3 months ago
hw * futex: support Windows 1 day ago
include * futex: support Windows 1 day ago
io io: Add helper for setting socket send buffer size 1 week ago
libdecnumber libdecnumber/dpd/decimal64: Fix compiler warning from Clang 15 3 years ago
linux-headers linux-headers: update from 6.15 + kvm/next 4 weeks ago
linux-user linux-user: implement pgid field of /proc/self/stat 1 week ago
migration migration/postcopy: Replace QemuSemaphore with QemuEvent 1 day ago
monitor monitor: don't wake up qmp_dispatcher_co coroutine upon cleanup 1 month ago
nbd nbd: Set unix socket send buffer on Linux 1 week ago
net vdpa: move iova_tree allocation to net_vhost_vdpa_init 5 days ago
pc-bios pc-bios: Add AST27x0 vBootrom 1 month ago
plugins meson: remove lib{system, user}_ss aliases 2 weeks ago
po po: update Italian translation 10 months ago
python python: Drop redundant warn_unused_configs = True 2 days ago
qapi qapi: Improve documentation around job state @concluded 4 days ago
qga cleanup: Drop pointless return at end of function 1 month ago
qobject qapi: Move include/qapi/qmp/ to include/qobject/ 4 months ago
qom qom: reverse order of instance_post_init calls 3 weeks ago
replay include/exec: Split out icount.h 1 month ago
roms ppc/pnv: Make HOMER memory a RAM region 3 months ago
rust rust: make TryFrom macro more resilient 1 day ago
scripts * futex: support Windows 1 day ago
scsi qom: Make InterfaceInfo[] uses const 1 month ago
semihosting include: Remove 'exec/exec-all.h' 1 month ago
stats qapi: Move include/qapi/qmp/ to include/qobject/ 4 months ago
storage-daemon storage-daemon/qapi/qapi-schema: Add a proper introduction 2 months ago
stubs qapi: make s390x specific CPU commands unconditionally available 1 week ago
subprojects subprojects: add the foreign crate 2 days ago
system vfio: return mr from vfio_get_xlat_addr 2 days ago
target target/i386: Wire up MXCSR.DE and FPUS.DE correctly 1 day ago
tcg * target/i386/kvm: Intel TDX support 1 week ago
tests * futex: support Windows 1 day ago
tools cleanup: Re-run return_directly.cocci 1 month ago
trace trace/control-target: cleanup headers and make compilation unit common 3 months ago
ui ui/gtk-egl: Render guest content with padding in fixed-scale mode 2 weeks ago
util qemu-thread: Use futex if available for QemuLockCnt 1 day ago
.b4-config Add a b4 configuration file 5 months ago
.dir-locals.el Add .dir-locals.el file to configure emacs coding style 10 years ago
.editorconfig editorconfig: update for perl scripts 5 months ago
.exrc qemu: add .exrc 13 years ago
.gdbinit .gdbinit: load QEMU sub-commands when gdb starts 8 years ago
.git-blame-ignore-revs metadata: add .git-blame-ignore-revs 2 years ago
.gitattributes rust: patch bilge-impl to allow compilation with 1.63.0 7 months ago
.gitignore configure: rename --enable-pypi to --enable-download, control subprojects too 2 years ago
.gitlab-ci.yml docs: Document GitLab custom CI/CD variables 4 years ago
.gitmodules meson: subprojects: replace berkeley-{soft,test}float-3 with wraps 2 years ago
.gitpublish Add a git-publish configuration file 7 years ago
.mailmap mailmap: Update email address for Akihiko Odaki 3 months ago
.patchew.yml scripts/checkpatch: roll diff tweaking into checkpatch itself 4 years ago
.readthedocs.yml readthodocs: fully specify a build environment 1 year ago
.travis.yml Revert "Remove the unused sh4eb target" 7 months ago
COPYING COPYING: update from FSF 17 years ago
COPYING.LIB COPYING.LIB: Synchronize the LGPL 2.1 with the version from gnu.org 6 years ago
Kconfig build-sys: Add rust feature option 8 months ago
Kconfig.host pvg: do not enable it on cross-architecture targets 3 months ago
LICENSE tcg/LICENSE: Remove out of date claim about TCG subdirectory licensing 6 years ago
MAINTAINERS vfio: move vfio-cpr.h 2 days ago
Makefile Makefile: "make dist" generates a .xz, not .bz2 3 months ago
README.rst README.rst: add the missing punctuations 11 months ago
VERSION Open 10.1 development tree 2 months ago
block.c block: move drain outside of quorum_del_child() 3 days ago
blockdev-nbd.c qapi: merge common parts of NbdServerOptions and nbd-server-start data 3 months ago
blockdev.c blockdev: drain while unlocked in external_snapshot_action() 3 days ago
blockjob.c block: move drain outside of bdrv_root_unref_child() 3 days ago
clippy.toml rust: use native Meson support for clippy and rustdoc 4 days ago
configure build, dockerfiles: add support for detecting rustdoc 4 days ago
cpu-common.c cpus: Prefer cached CpuClass over CPU_GET_CLASS() macro 3 months ago
cpu-target.c qemu: Convert target_name() to TargetInfo API 1 month ago
event-loop-base.c qom: Make InterfaceInfo[] uses const 1 month ago
gitdm.config contrib/gitdm: add group map for AMD 2 years ago
hmp-commands-info.hx migration/hmp: Add "info migrate -a", reorg the dump 3 weeks ago
hmp-commands.hx hmp/migration: Fix "migrate" command's documentation 1 year ago
iothread.c qom: Have class_init() take a const data argument 1 month ago
job-qmp.c qapi job: Elide redundant has_FOO in generated C 3 years ago
job.c test-bdrv-drain: Fix data races 2 months ago
meson.build futex: Support Windows 1 day ago
meson_options.txt meson: drop --enable-avx* options 4 weeks ago
module-common.c all: Clean up includes 9 years ago
os-posix.c os: add an ability to lock memory on_fault 4 months ago
os-wasm.c include/qemu/osdep.h: Add Emscripten-specific OS dependencies 1 month ago
os-win32.c include: Rename sysemu/ -> system/ 6 months ago
page-target.c page-vary: Move and rename qemu_target_page_bits_min 1 month ago
page-vary-common.c Remove qemu-common.h include from most units 3 years ago
page-vary-target.c page-vary: Restrict scope of TARGET_PAGE_BITS_MIN 1 month ago
pythondeps.toml meson: update to version 1.8.1 4 days ago
qemu-bridge-helper.c qemu-bridge-helper: relocate path to default ACL 5 years ago
qemu-edid.c qemu-edid: Restrict input parameter -d to avoid division by zero 3 years ago
qemu-img-cmds.hx docs/devel/docs: Document .hx file syntax 1 year ago
qemu-img.c block/snapshot: move drain outside of read-locked bdrv_snapshot_delete() 3 days ago
qemu-io-cmds.c qapi: Move include/qapi/qmp/ to include/qobject/ 4 months ago
qemu-io.c qapi: Move include/qapi/qmp/ to include/qobject/ 4 months ago
qemu-keymap.c cleanup: Drop pointless return at end of function 1 month ago
qemu-nbd.c nbd: Defer trace init until after daemonization 3 months ago
qemu-options.hx alsaaudio: Set try-poll to false by default 2 weeks ago
qemu.nsi pc-bios: Move device tree files in their own subdir 1 month ago
qemu.sasl sasl: remove comment about obsolete kerberos versions 4 years ago
replication.c replication: move include out of root directory 4 years ago
target-info-stub.c qemu: Introduce target_long_bits() 1 month ago
target-info.c qemu: Introduce target_long_bits() 1 month ago
trace-events system/dma-helpers.c: Move trace events to system/trace-events 7 months ago
version.rc configure: remove CONFIG_FILEVERSION and CONFIG_PRODUCTVERSION 4 years ago

README.rst

===========
QEMU README
===========

QEMU is a generic and open source machine & userspace emulator and
virtualizer.

QEMU is capable of emulating a complete machine in software without any
need for hardware virtualization support. By using dynamic translation,
it achieves very good performance. QEMU can also integrate with the Xen
and KVM hypervisors to provide emulated hardware while allowing the
hypervisor to manage the CPU. With hypervisor support, QEMU can achieve
near native performance for CPUs. When QEMU emulates CPUs directly it is
capable of running operating systems made for one machine (e.g. an ARMv7
board) on a different machine (e.g. an x86_64 PC board).

QEMU is also capable of providing userspace API virtualization for Linux
and BSD kernel interfaces. This allows binaries compiled against one
architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a
different architecture ABI (e.g. the Linux x86_64 ABI). This does not
involve any hardware emulation, simply CPU and syscall emulation.

QEMU aims to fit into a variety of use cases. It can be invoked directly
by users wishing to have full control over its behaviour and settings.
It also aims to facilitate integration into higher level management
layers, by providing a stable command line interface and monitor API.
It is commonly invoked indirectly via the libvirt library when using
open source applications such as oVirt, OpenStack and virt-manager.

QEMU as a whole is released under the GNU General Public License,
version 2. For full licensing details, consult the LICENSE file.


Documentation
=============

Documentation can be found hosted online at
`<https://www.qemu.org/documentation/>`_. The documentation for the
current development version that is available at
`<https://www.qemu.org/docs/master/>`_ is generated from the ``docs/``
folder in the source tree, and is built by `Sphinx
<https://www.sphinx-doc.org/en/master/>`_.


Building
========

QEMU is multi-platform software intended to be buildable on all modern
Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety
of other UNIX targets. The simple steps to build QEMU are:


.. code-block:: shell

  mkdir build
  cd build
  ../configure
  make

Additional information can also be found online via the QEMU website:

* `<https://wiki.qemu.org/Hosts/Linux>`_
* `<https://wiki.qemu.org/Hosts/Mac>`_
* `<https://wiki.qemu.org/Hosts/W32>`_


Submitting patches
==================

The QEMU source code is maintained under the GIT version control system.

.. code-block:: shell

   git clone https://gitlab.com/qemu-project/qemu.git

When submitting patches, one common approach is to use 'git
format-patch' and/or 'git send-email' to format & send the mail to the
qemu-devel@nongnu.org mailing list. All patches submitted must contain
a 'Signed-off-by' line from the author. Patches should follow the
guidelines set out in the `style section
<https://www.qemu.org/docs/master/devel/style.html>`_ of
the Developers Guide.

Additional information on submitting patches can be found online via
the QEMU website:

* `<https://wiki.qemu.org/Contribute/SubmitAPatch>`_
* `<https://wiki.qemu.org/Contribute/TrivialPatches>`_

The QEMU website is also maintained under source control.

.. code-block:: shell

  git clone https://gitlab.com/qemu-project/qemu-web.git

* `<https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/>`_

A 'git-publish' utility was created to make above process less
cumbersome, and is highly recommended for making regular contributions,
or even just for sending consecutive patch series revisions. It also
requires a working 'git send-email' setup, and by default doesn't
automate everything, so you may want to go through the above steps
manually for once.

For installation instructions, please go to:

*  `<https://github.com/stefanha/git-publish>`_

The workflow with 'git-publish' is:

.. code-block:: shell

  $ git checkout master -b my-feature
  $ # work on new commits, add your 'Signed-off-by' lines to each
  $ git publish

Your patch series will be sent and tagged as my-feature-v1 if you need to refer
back to it in the future.

Sending v2:

.. code-block:: shell

  $ git checkout my-feature # same topic branch
  $ # making changes to the commits (using 'git rebase', for example)
  $ git publish

Your patch series will be sent with 'v2' tag in the subject and the git tip
will be tagged as my-feature-v2.

Bug reporting
=============

The QEMU project uses GitLab issues to track bugs. Bugs
found when running code built from QEMU git or upstream released sources
should be reported via:

* `<https://gitlab.com/qemu-project/qemu/-/issues>`_

If using QEMU via an operating system vendor pre-built binary package, it
is preferable to report bugs to the vendor's own bug tracker first. If
the bug is also known to affect latest upstream code, it can also be
reported via GitLab.

For additional information on bug reporting consult:

* `<https://wiki.qemu.org/Contribute/ReportABug>`_


ChangeLog
=========

For version history and release notes, please visit
`<https://wiki.qemu.org/ChangeLog/>`_ or look at the git history for
more detailed information.


Contact
=======

The QEMU community can be contacted in a number of ways, with the two
main methods being email and IRC:

* `<mailto:qemu-devel@nongnu.org>`_
* `<https://lists.nongnu.org/mailman/listinfo/qemu-devel>`_
* #qemu on irc.oftc.net

Information on additional methods of contacting the community can be
found online via the QEMU website:

* `<https://wiki.qemu.org/Contribute/StartHere>`_