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/docs/master/ is generated from the docs/ folder in the source tree, and is built by 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:

mkdir build
cd build
../configure
make

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

• https://wiki.qemu.org/Hosts/Mac
• Submitting patches

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

  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 https://wiki.qemu.org/Contribute/SubmitAPatch

• git clone https://gitlab.com/qemu-project/qemu-web.git
  • https://github.com/stefanha/git-publish

  The workflow with 'git-publish' is:

  $ 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:

  $ 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://wiki.qemu.org/Contribute/ReportABug

  ChangeLog

  For version history and release notes, please visit 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://wiki.qemu.org/Contribute/StartHere