QEMU main repository: Please see http://wiki.qemu.org/Contribute/SubmitAPatch for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org
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Markus Armbruster 7653b1eac9 replay: Improve error messages about configuration conflicts
Improve

   Record/replay feature is not supported for '-rtc base=localtime'
   Record/replay feature is not supported for 'smp'
   Record/replay feature is not supported for '-snapshot'

to

   Record/replay is not supported with -rtc base=localtime
   Record/replay is not supported with multiple CPUs
   Record/replay is not supported with -snapshot

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2024-03-09 18:56:36 +03:00
.github/workflows github: fix config mistake preventing repo lockdown commenting 2022-04-26 16:12:26 +01:00
.gitlab/issue_templates .gitlab/issue_templates: Move suggestions into comments 2022-12-15 15:19:24 +01:00
.gitlab-ci.d gitlab: update FreeBSD Cirrus CI image to 13.3 2024-03-04 15:59:12 +00:00
accel plugins: cleanup codepath for previous inline operation 2024-03-06 12:35:50 +00:00
audio audio: Depend on dbus_display1_dep 2024-02-16 17:27:22 +04:00
authz error: Drop superfluous #include "qapi/qmp/qerror.h" 2023-02-23 13:56:14 +01:00
backends oslib-posix: initialize backend memory objects in parallel 2024-02-06 08:15:22 +01:00
block - LUKS support for detached headers 2024-02-12 14:13:58 +00:00
bsd-user gdbstub: Call gdbserver_fork() both in parent and in child 2024-03-06 12:35:19 +00:00
chardev chardev/char-socket: Fix TLS io channels sending too much data to the backend 2024-03-01 08:27:33 +01:00
common-user common-user/host/ppc: Implement safe-syscall.inc.S 2023-01-23 14:39:48 -10:00
configs hw/arm/mps3r: Initial skeleton for mps3-an536 board 2024-02-15 14:32:38 +00:00
contrib contrib/plugins/howvec: migrate to new per_vcpu API 2024-03-06 12:35:44 +00:00
crypto crypto: Introduce 'detached-header' field in QCryptoBlockInfoLUKS 2024-02-09 12:50:37 +00:00
disas target/riscv: honour show_opcodes when disassembling 2024-03-06 12:35:51 +00:00
docs hw/gpio: Implement STM32L4x5 GPIO 2024-03-07 12:19:25 +00:00
dump dump: Fix HMP dump-guest-memory -z without -R 2024-01-30 21:20:20 +03:00
ebpf trace-events: Fix the name of the tracing.rst file 2023-09-08 13:08:51 +03:00
fpu fpu: Handle m68k extended precision denormals properly 2023-09-16 14:57:16 +00:00
fsdev configure, meson: rename targetos to host_os 2023-12-31 09:11:29 +01:00
gdb-xml gdb-xml: fix duplicate register in arm-neon.xml 2023-11-08 15:15:23 +00:00
gdbstub gdbstub: Implement follow-fork-mode child 2024-03-06 12:35:19 +00:00
host/include host/include/generic/host/atomic128: Fix compilation problem with Clang 17 2023-11-13 11:35:47 +01:00
hw target-arm queue: 2024-03-08 18:19:09 +00:00
include target-arm queue: 2024-03-08 18:19:09 +00:00
io io: fsync before closing a file channel 2024-03-01 15:42:04 +08:00
libdecnumber libdecnumber/dpd/decimal64: Fix compiler warning from Clang 15 2022-11-11 09:13:52 +01:00
linux-headers linux-headers: Update to Linux v6.8-rc6 2024-03-08 20:48:03 +10:00
linux-user linux-user/riscv: Add Ztso extension to hwprobe 2024-03-08 20:48:03 +10:00
migration QAPI patches patches for 2024-03-04 2024-03-05 11:20:15 +00:00
monitor monitor/target: Include missing 'exec/memory.h' header 2024-02-13 10:59:25 +03:00
nbd nbd/server: introduce NBDClient->lock to protect fields 2023-12-21 21:59:10 +01:00
net migration: MigrationNotifyFunc 2024-02-28 11:31:28 +08:00
pc-bios pc-bios/README: Add information about hppa-firmware 2024-03-03 06:41:19 +01:00
plugins plugins: cleanup codepath for previous inline operation 2024-03-06 12:35:50 +00:00
po po: add ukrainian translation 2022-07-05 10:15:49 +02:00
python buildsys: Bump known good meson version to v1.2.3 2023-11-24 16:21:55 +01:00
qapi Darwin Cocoa patches: 2024-03-08 18:19:25 +00:00
qga qga/qapi-schema: Fix guest-set-memory-blocks documentation 2024-03-04 07:12:40 +01:00
qobject docs/interop: Convert qmp-spec.txt to rST 2023-05-22 10:21:01 +02:00
qom hw/acpi: move object_resolve_type_unambiguous to core QOM 2024-02-27 09:36:41 +01:00
replay replay: Improve error messages about configuration conflicts 2024-03-09 18:56:36 +03:00
roms roms/hppa: Add build rules for hppa-firmware 2024-03-03 06:41:19 +01:00
scripts qapi: Reject "Returns" section when command doesn't return anything 2024-03-04 07:12:40 +01:00
scsi configure, meson: rename targetos to host_os 2023-12-31 09:11:29 +01:00
semihosting {linux,bsd}-user: Introduce get_task_state() 2024-03-06 12:35:19 +00:00
stats meson: Replace softmmu_ss -> system_ss 2023-06-20 10:01:30 +02:00
storage-daemon meson: remove config_targetos 2023-12-31 09:11:28 +01:00
stubs system/replay: Restrict icount to system emulation 2024-01-19 12:28:59 +01:00
subprojects userfaultfd: use 1ULL to build ioctl masks 2024-01-29 11:02:12 +08:00
system replay: Improve error messages about configuration conflicts 2024-03-09 18:56:36 +03:00
target target-arm queue: 2024-03-08 18:19:09 +00:00
tcg tcg/optimize: fix uninitialized variable 2024-02-29 11:36:05 -10:00
tests target-arm queue: 2024-03-08 18:19:09 +00:00
tools ebpf: fix compatibility with libbpf 1.0+ 2023-03-10 17:26:47 +08:00
trace tracing: install trace events file only if necessary 2023-12-27 05:01:55 -05:00
ui ui/cocoa: Remove stretch_video flag 2024-03-05 12:04:41 +01:00
util notify: pass error to notifier with return 2024-02-28 11:31:28 +08:00
.dir-locals.el
.editorconfig .editorconfig: update the automatic mode setting for Emacs 2021-03-10 15:34:11 +00:00
.exrc
.gdbinit .gdbinit: load QEMU sub-commands when gdb starts 2017-06-07 14:38:45 +01:00
.git-blame-ignore-revs metadata: add .git-blame-ignore-revs 2023-04-04 15:56:44 +01:00
.gitattributes gitattributes: Cover Objective-C source files 2022-03-29 00:15:14 +02:00
.gitignore configure: rename --enable-pypi to --enable-download, control subprojects too 2023-06-06 16:30:01 +02:00
.gitlab-ci.yml docs: Document GitLab custom CI/CD variables 2021-07-29 07:56:01 +02:00
.gitmodules meson: subprojects: replace berkeley-{soft,test}float-3 with wraps 2023-06-06 16:30:01 +02:00
.gitpublish Add a git-publish configuration file 2018-03-05 09:03:17 +00:00
.mailmap mailmap: Fix Stefan Weil email 2024-01-30 21:20:20 +03:00
.patchew.yml scripts/checkpatch: roll diff tweaking into checkpatch itself 2021-06-25 10:08:33 +01:00
.readthedocs.yml readthodocs: fully specify a build environment 2024-01-12 13:23:48 +00:00
.travis.yml travis-ci: Correct invalid mentions of 'softmmu' by 'system' 2023-10-07 19:02:33 +02:00
block.c block: Support detached LUKS header creation using qemu-img 2024-02-09 12:50:37 +00:00
blockdev-nbd.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
blockdev.c stream: Allow users to request only format driver names in backing file format 2024-01-26 11:16:58 +01:00
blockjob.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
configure configure: put all symlink creation together 2024-02-16 13:56:09 +01:00
COPYING
COPYING.LIB COPYING.LIB: Synchronize the LGPL 2.1 with the version from gnu.org 2019-01-30 11:01:22 +01:00
cpu-common.c system/cpus: rename qemu_mutex_lock_iothread() to bql_lock() 2024-01-08 10:45:43 -05:00
cpu-target.c cpu: Remove page_size_init 2024-02-29 11:35:37 -10:00
event-loop-base.c util/event-loop-base: Introduce options to set the thread pool size 2022-05-09 10:43:23 +01:00
gitdm.config contrib/gitdm: add group map for AMD 2023-03-22 15:08:26 +00:00
hmp-commands-info.hx docs/devel/docs: Document .hx file syntax 2024-01-15 17:12:22 +00:00
hmp-commands.hx hmp: Remove deprecated 'singlestep' command 2024-01-19 11:38:32 +01:00
iothread.c iothread: Simplify expression in qemu_in_iothread() 2024-02-13 10:59:25 +03:00
job-qmp.c qapi job: Elide redundant has_FOO in generated C 2022-12-14 20:04:47 +01:00
job.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
Kconfig meson: Introduce target-specific Kconfig 2021-07-09 18:21:34 +02:00
Kconfig.host build-sys: add a "pixman" feature 2023-11-07 14:04:24 +04:00
LICENSE tcg/LICENSE: Remove out of date claim about TCG subdirectory licensing 2019-11-11 15:11:21 +01:00
MAINTAINERS hw/gpio: Implement STM32L4x5 GPIO 2024-03-07 12:19:25 +00:00
Makefile Makefile: clean qemu-iotests output 2023-12-31 09:11:28 +01:00
meson_options.txt meson: fix type of "relocatable" option 2023-12-31 09:11:27 +01:00
meson.build meson: detect broken clang 17 with -fzero-call-used-regs 2024-03-04 15:57:35 +00:00
module-common.c all: Clean up includes 2016-02-04 17:41:30 +00:00
os-posix.c qemu_init: increase NOFILE soft limit on POSIX 2024-02-09 12:47:58 +00:00
os-win32.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
page-vary-common.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
page-vary-target.c exec: Rename target specific page-vary.c -> page-vary-target.c 2023-10-04 11:03:54 -07:00
pythondeps.toml buildsys: Bump known good meson version to v1.2.3 2023-11-24 16:21:55 +01:00
qemu-bridge-helper.c qemu-bridge-helper: relocate path to default ACL 2020-09-30 19:11:36 +02:00
qemu-edid.c qemu-edid: Restrict input parameter -d to avoid division by zero 2022-10-12 13:38:15 +02:00
qemu-img-cmds.hx docs/devel/docs: Document .hx file syntax 2024-01-15 17:12:22 +00:00
qemu-img.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
qemu-io-cmds.c block: Mark bdrv_get_specific_info() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
qemu-io.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
qemu-keymap.c qemu-keymap: properly check return from xkb_keymap_mod_get_index 2023-07-03 12:51:21 +01:00
qemu-nbd.c qemu-nbd: mention --tls-hostname option in qemu-nbd --help 2024-02-13 10:59:25 +03:00
qemu-options.hx qemu-options.hx: Don't claim "-serial" has limit of 4 serial ports 2024-03-05 13:22:56 +00:00
qemu.nsi nsis installer: Fix mouse-over descriptions for emulators 2022-03-18 10:55:15 +00:00
qemu.sasl sasl: remove comment about obsolete kerberos versions 2021-06-14 13:28:50 +01:00
README.rst README.rst: fix link formatting 2022-08-04 13:44:21 +02:00
replication.c replication: move include out of root directory 2021-05-26 14:49:46 +02:00
trace-events trace-events: remove the remaining vcpu trace events 2023-06-01 11:05:05 -04:00
VERSION Open 9.0 development tree 2023-12-19 09:46:22 -05:00
version.rc configure: remove CONFIG_FILEVERSION and CONFIG_PRODUCTVERSION 2021-01-02 21:03:37 +01:00

===========
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/documentation/>`_. The documentation for the
current development version that is available at
`<https://www.qemu.org/docs/master/>`_ is generated from the ``docs/``
folder in the source tree, and is built by `Sphinx
<https://www.sphinx-doc.org/en/master/>`_.


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:


.. code-block:: shell

  mkdir build
  cd build
  ../configure
  make

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

* `<https://wiki.qemu.org/Hosts/Linux>`_
* `<https://wiki.qemu.org/Hosts/Mac>`_
* `<https://wiki.qemu.org/Hosts/W32>`_


Submitting patches
==================

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

.. code-block:: shell

   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 `style section
<https://www.qemu.org/docs/master/devel/style.html>`_ of
the Developers Guide.

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

* `<https://wiki.qemu.org/Contribute/SubmitAPatch>`_
* `<https://wiki.qemu.org/Contribute/TrivialPatches>`_

The QEMU website is also maintained under source control.

.. code-block:: shell

  git clone https://gitlab.com/qemu-project/qemu-web.git

* `<https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/>`_

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

*  `<https://github.com/stefanha/git-publish>`_

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:

* `<https://gitlab.com/qemu-project/qemu/-/issues>`_

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:

* `<https://wiki.qemu.org/Contribute/ReportABug>`_


ChangeLog
=========

For version history and release notes, please visit
`<https://wiki.qemu.org/ChangeLog/>`_ or look at the git history for
more detailed information.


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://lists.nongnu.org/mailman/listinfo/qemu-devel>`_
* #qemu on irc.oftc.net

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

* `<https://wiki.qemu.org/Contribute/StartHere>`_