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descriptionarmbru's QEMU hackery
last changeTue, 23 Apr 2024 13:19:21 +0000 (23 14:19 +0100)
content tags

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

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 can be found hosted online at
`<>`_. The documentation for the
current development version that is available at
`<>`_ is generated from the ``docs/``
folder in the source tree, and is built by `Sphinx


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

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

* `<>`_
* `<>`_
* `<>`_

Submitting patches

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

.. code-block:: shell

   git clone

When submitting patches, one common approach is to use 'git
format-patch' and/or 'git send-email' to format & send the mail to the 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
<>`_ of
the Developers Guide.

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

* `<>`_
* `<>`_

The QEMU website is also maintained under source control.

.. code-block:: shell

  git clone

* `<>`_

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

*  `<>`_

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:

* `<>`_

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:

* `<>`_


For version history and release notes, please visit
`<>`_ or look at the git history for
more detailed information.


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

* `<>`_
* `<>`_
* #qemu on

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

* `<>`_
2 days ago Peter MaydellUpdate version for 9.0.0 releasemaster
8 days ago Peter MaydellUpdate version for v9.0.0-rc4 release
9 days ago Kevin Wolfusb-storage: Fix BlockConf defaults
9 days ago Peter MaydellMerge tag 'hw-misc-20240415' of
10 days ago Peter MaydellMerge tag 'for_upstream' of https://git./virt/kvm/mst...
10 days ago BALATON Zoltanhw/pci-host/ppc440_pcix: Do not expose a bridge device...
10 days ago BALATON Zoltanhw/isa/vt82c686: Keep track of PIRQ/PINT pins separately
10 days ago Cindy Luvirtio-pci: fix use of a released vector
12 days ago Peter MaydellMerge tag 'pull-sp-20240412' of
12 days ago Richard Hendersontarget/sparc: Use GET_ASI_CODE for ASI_KERNELTXT and...
12 days ago Peter MaydellMerge tag 'for-upstream' of
13 days ago Thomas Disable -fzero-call-used-regs on OpenBSD
13 days ago Matheus Tavares... Makefile: fix use of -j without an argument
2024-04-10 Peter MaydellUpdate version for v9.0.0-rc3 release
2024-04-10 Peter MaydellMerge tag 'hw-misc-20240410' of
2024-04-10 Philippe Mathieu... hw/audio/virtio-snd: Remove unused assignment
30 hours ago pull-qapi-2024-04-24 QAPI patches patches for 2024-04-24
30 hours ago pull-error-2024-04-24 Error reporting patches for 2024...
4 weeks ago pull-qapi-2024-03-26 QAPI patches patches for 2024-03-26
6 weeks ago pull-error-2024-03-12 Error reporting patches for 2024...
7 weeks ago pull-qapi-2024-03-04 QAPI patches patches for 2024-03-04
8 weeks ago pull-qapi-2024-02-26 QAPI patches patches for 2024-02-26
2 months ago pull-char-2024-02-12-v2 Character device backend patches...
2 months ago pull-qapi-2024-02-12 QAPI patches patches for 2024-02-12
2 months ago pull-char-2024-02-12 Character device backend patches...
2 months ago pull-qapi-2024-02-03 QAPI patches patches for 2024-02-03
2 months ago pull-qapi-2024-01-26 QAPI patches patches for 2024-01-26
5 months ago pull-error-2023-11-17 Error reporting patches for 2023...
5 months ago pull-qapi-2023-11-13 QAPI patches patches for 2023-11-13
5 months ago pull-shadow-2023-11-13 -Wshadow=local patches for 2023...
6 months ago pull-qapi-2023-10-19 QAPI patches patches for 2023-10-19
6 months ago pull-shadow-2023-10-12 -Wshadow=local patches for 2023...
2 days ago master
2 months ago qapi-elide-internal-wip
2 years ago merge-qapi-aliases-v4
4 years ago check-headers
6 years ago qapi-cmdline
9 years ago kill-non-qdev-ide