5 QEMU is a generic and open source machine & userspace emulator and
8 QEMU is capable of emulating a complete machine in software without any
9 need for hardware virtualization support. By using dynamic translation,
10 it achieves very good performance. QEMU can also integrate with the Xen
11 and KVM hypervisors to provide emulated hardware while allowing the
12 hypervisor to manage the CPU. With hypervisor support, QEMU can achieve
13 near native performance for CPUs. When QEMU emulates CPUs directly it is
14 capable of running operating systems made for one machine (e.g. an ARMv7
15 board) on a different machine (e.g. an x86_64 PC board).
17 QEMU is also capable of providing userspace API virtualization for Linux
18 and BSD kernel interfaces. This allows binaries compiled against one
19 architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a
20 different architecture ABI (e.g. the Linux x86_64 ABI). This does not
21 involve any hardware emulation, simply CPU and syscall emulation.
23 QEMU aims to fit into a variety of use cases. It can be invoked directly
24 by users wishing to have full control over its behaviour and settings.
25 It also aims to facilitate integration into higher level management
26 layers, by providing a stable command line interface and monitor API.
27 It is commonly invoked indirectly via the libvirt library when using
28 open source applications such as oVirt, OpenStack and virt-manager.
30 QEMU as a whole is released under the GNU General Public License,
31 version 2. For full licensing details, consult the LICENSE file.
37 QEMU is multi-platform software intended to be buildable on all modern
38 Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety
39 of other UNIX targets. The simple steps to build QEMU are:
49 Additional information can also be found online via the QEMU website:
51 * `<https://qemu.org/Hosts/Linux>`_
52 * `<https://qemu.org/Hosts/Mac>`_
53 * `<https://qemu.org/Hosts/W32>`_
59 The QEMU source code is maintained under the GIT version control system.
63 git clone https://gitlab.com/qemu-project/qemu.git
65 When submitting patches, one common approach is to use 'git
66 format-patch' and/or 'git send-email' to format & send the mail to the
67 qemu-devel@nongnu.org mailing list. All patches submitted must contain
68 a 'Signed-off-by' line from the author. Patches should follow the
69 guidelines set out in the `style section
70 <https://www.qemu.org/docs/master/devel/style.html>` of
73 Additional information on submitting patches can be found online via
76 * `<https://qemu.org/Contribute/SubmitAPatch>`_
77 * `<https://qemu.org/Contribute/TrivialPatches>`_
79 The QEMU website is also maintained under source control.
83 git clone https://gitlab.com/qemu-project/qemu-web.git
85 * `<https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/>`_
87 A 'git-publish' utility was created to make above process less
88 cumbersome, and is highly recommended for making regular contributions,
89 or even just for sending consecutive patch series revisions. It also
90 requires a working 'git send-email' setup, and by default doesn't
91 automate everything, so you may want to go through the above steps
94 For installation instructions, please go to
96 * `<https://github.com/stefanha/git-publish>`_
98 The workflow with 'git-publish' is:
100 .. code-block:: shell
102 $ git checkout master -b my-feature
103 $ # work on new commits, add your 'Signed-off-by' lines to each
106 Your patch series will be sent and tagged as my-feature-v1 if you need to refer
107 back to it in the future.
111 .. code-block:: shell
113 $ git checkout my-feature # same topic branch
114 $ # making changes to the commits (using 'git rebase', for example)
117 Your patch series will be sent with 'v2' tag in the subject and the git tip
118 will be tagged as my-feature-v2.
123 The QEMU project uses Launchpad as its primary upstream bug tracker. Bugs
124 found when running code built from QEMU git or upstream released sources
125 should be reported via:
127 * `<https://bugs.launchpad.net/qemu/>`_
129 If using QEMU via an operating system vendor pre-built binary package, it
130 is preferable to report bugs to the vendor's own bug tracker first. If
131 the bug is also known to affect latest upstream code, it can also be
132 reported via launchpad.
134 For additional information on bug reporting consult:
136 * `<https://qemu.org/Contribute/ReportABug>`_
142 For version history and release notes, please visit
143 `<https://wiki.qemu.org/ChangeLog/>`_ or look at the git history for
144 more detailed information.
150 The QEMU community can be contacted in a number of ways, with the two
151 main methods being email and IRC
153 * `<mailto:qemu-devel@nongnu.org>`_
154 * `<https://lists.nongnu.org/mailman/listinfo/qemu-devel>`_
155 * #qemu on irc.oftc.net
157 Information on additional methods of contacting the community can be
158 found online via the QEMU website:
160 * `<https://qemu.org/Contribute/StartHere>`_