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last changeThu, 23 Jun 2016 10:53:14 +0000 (23 11:53 +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

Complete details of the process for building and configuring QEMU for
all supported host platforms can be found in the qemu-tech.html file.
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:

-- End
4 days ago Peter MaydellMerge remote-tracking branch 'remotes/dgibson/tags... master
4 days ago Peter MaydellMerge remote-tracking branch 'remotes/kraxel/tags/pull...
5 days ago Peter MaydellMerge remote-tracking branch 'remotes/sstabellini/tags...
5 days ago Thomas Huthppc: Disable huge page support if it is not available...
5 days ago Benjamin Herrenschmidtppc: Add P7/P8 Power Management instructions
5 days ago Benjamin Herrenschmidtppc: Move exception generation code out of line
5 days ago Benjamin Herrenschmidtppc: Turn a bunch of booleans from int to bool
5 days ago Benjamin Herrenschmidtppc: Add real mode CI load/store instructions for P7...
5 days ago Benjamin Herrenschmidtppc: Rework generation of priv and inval interrupts
5 days ago Benjamin Herrenschmidtppc: Fix generation if ISI/DSI vs. HV mode
5 days ago Benjamin Herrenschmidtppc: Fix POWER7 and POWER8 exception definitions
5 days ago Benjamin Herrenschmidtppc: fix exception model for HV mode
5 days ago Benjamin Herrenschmidtppc: define a default LPCR value
5 days ago Benjamin Herrenschmidtppc: Fix rfi/rfid/hrfi/... emulation
5 days ago Gerd Hoffmannusb-uas: hotplug support
5 days ago Gerd Hoffmannusb-bot: hotplug support
11 days ago for-upstream Block layer patches
3 years ago delayed_cow_v2
3 years ago delayed_cow_v1
3 days ago block
4 days ago blockdev-split
4 days ago master
6 days ago child-io
7 days ago devel
6 weeks ago block-next
5 months ago blockdev
5 months ago qcow2-lock
10 months ago data-cache
11 months ago qcow2-journal
18 months ago perf-full
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