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last changeThu, 10 Aug 2017 17:53:39 +0000 (10 18:53 +0100)
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         QEMU README

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.


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

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.

   git clone git://

When submitting patches, the preferred 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 HACKING and CODING_STYLE files.

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

Bug reporting

The QEMU project uses Launchpad as its primary upstream bug tracker. 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 launchpad.

For additional information on bug reporting consult:


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:

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5 days ago Peter MaydellMerge remote-tracking branch 'remotes/stefanha/tags... master
5 days ago Peter MaydellMerge remote-tracking branch 'remotes/gkurz/tags/for...
5 days ago Stefan Hajnoczivirtio-blk: handle blk_getlength() errors
5 days ago Kevin WolfIDE: test flush on empty CDROM
5 days ago Stefan HajnocziIDE: Do not flush empty CDROM drives
6 days ago Greg Kurz9pfs: local: fix fchmodat_nofollow() limitations
6 days ago Peter MaydellMerge remote-tracking branch 'remotes/dgibson/tags...
6 days ago Peter MaydellMerge remote-tracking branch 'remotes/mst/tags/for_upst...
7 days ago Sam Bobroffspapr: Fix bug in h_signal_sys_reset()
7 days ago Greg Kurzspapr_drc: abort if object_property_add_child() fails
7 days ago David Gibsontarget/ppc: Add stub implementation of the PSSCR
7 days ago David Gibsontarget/ppc: Implement TIDR
7 days ago Greg Kurzppc: fix double-free in cpu_post_load()
7 days ago KONRAD Fredericbooke206: fix MAS update on tlb miss
7 days ago Jens Freimannlibqtest: always set up signal handler for SIGABRT
7 days ago Jens Freimannlibvhost-user: quit when no more data received
4 days ago for-upstream Block layer patches for 2.10.0-rc3
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