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Emanuele Giuseppe Esposito a27dd2de68 KVM: keep track of running ioctls
Using the new accel-blocker API, mark where ioctls are being called
in KVM. Next, we will implement the critical section that will take
care of performing memslots modifications atomically, therefore
preventing any new ioctl from running and allowing the running ones
to finish.

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20221111154758.1372674-3-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-01-11 09:59:39 +01:00
.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-ci.d/windows: Do not run the qtests in the msys2-32bit job 2023-01-09 13:50:47 +01:00
accel KVM: keep track of running ioctls 2023-01-11 09:59:39 +01:00
audio qapi audio: Elide redundant has_FOO in generated C 2022-12-13 18:31:37 +01:00
authz configure, meson: convert pam detection to meson 2021-06-25 10:54:10 +02:00
backends hostmem: Honor multiple preferred nodes if possible 2022-12-28 14:59:55 +01:00
block error handling: Use RETRY_ON_EINTR() macro where applicable 2023-01-09 13:50:47 +01:00
bsd-user Drop more useless casts from void * to pointer 2022-12-14 16:19:35 +01:00
chardev * s390x header clean-ups from Philippe 2023-01-09 15:54:31 +00:00
common-user common-user: Only compile the common user code if have_user is set 2022-06-28 11:12:05 +02:00
configs i386, mips: Resolve redundant ACPI and APM dependencies 2023-01-08 01:54:21 -05:00
contrib contrib/vhost-user-blk: Replace lseek64 with lseek 2022-12-21 07:32:24 -05:00
crypto qapi crypto: Elide redundant has_FOO in generated C 2022-12-14 20:04:47 +01:00
disas disas/nanomips: Tidy read for 48-bit opcodes 2022-11-08 01:04:25 +01:00
docs * s390x header clean-ups from Philippe 2023-01-09 15:54:31 +00:00
dtc@b6910bec11 dtc: Update to version 1.6.1 2021-10-14 08:08:11 +02:00
dump Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
ebpf ebpf: replace deprecated bpf_program__set_socket_filter 2022-07-06 11:39:09 +08:00
fpu softfloat: logB(0) should raise divideByZero exception 2022-10-17 10:28:35 +08:00
fsdev fsdev/virtfs-proxy-helper: Use g_mkdir() 2022-10-24 12:24:32 +02:00
gdb-xml gdb-xml: Fix size of EFER register on i386 architecture when debugged by GDB 2022-11-06 09:48:26 +01:00
gdbstub gdbstub: move guest debug support check to ops 2022-10-06 11:53:41 +01:00
hw accel: introduce accelerator blocker API 2023-01-11 09:59:39 +01:00
include accel: introduce accelerator blocker API 2023-01-11 09:59:39 +01:00
io io/channel-watch: Fix socket watch on Windows 2022-10-26 13:32:08 +01:00
libdecnumber libdecnumber/dpd/decimal64: Fix compiler warning from Clang 15 2022-11-11 09:13:52 +01:00
linux-headers Update linux headers to v6.0-rc4 2022-09-26 17:23:47 +02:00
linux-user linux-user/hexagon: fix signal context save & restore 2023-01-05 09:19:02 -08:00
meson@3a9b285a55 meson: require 0.61.3 2022-10-01 21:16:36 +02:00
migration Migration patches for 8.0 2022-12-15 14:52:13 +00:00
monitor pci: Move HMP commands from monitor/ to new hw/pci/pci-hmp-cmds.c 2022-12-19 16:21:51 +01:00
nbd block-backend: replace bdrv_*_above with blk_*_above 2022-12-15 16:07:43 +01:00
net * s390x header clean-ups from Philippe 2023-01-09 15:54:31 +00:00
pc-bios update seabios binaries to 1.16.1 2022-11-28 11:06:05 +01:00
plugins plugins: add [pre|post]fork helpers to linux-user 2022-10-06 11:53:41 +01:00
po po: add ukrainian translation 2022-07-05 10:15:49 +02:00
python python: add 3.11 to supported list 2023-01-04 13:46:05 -05:00
qapi i386: SGX: remove deprecated member of SGXInfo 2023-01-06 00:51:02 +01:00
qga error handling: Use RETRY_ON_EINTR() macro where applicable 2023-01-09 13:50:47 +01:00
qobject include/qapi: add g_autoptr support for qobject types 2022-04-06 10:50:38 +02:00
qom qapi qdev qom: Elide redundant has_FOO in generated C 2022-12-14 20:05:07 +01:00
replay Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
roms update seabios source from 1.16.0 to 1.16.1 2022-11-28 10:57:42 +01:00
scripts * Atomic memslot updates for KVM (Emanuele, David) 2023-01-08 14:27:40 +00:00
scsi QIOChannel: Add flags on io_writev and introduce io_flush callback 2022-05-16 13:56:24 +01:00
semihosting error handling: Use RETRY_ON_EINTR() macro where applicable 2023-01-09 13:50:47 +01:00
softmmu i386: Deprecate the -no-hpet QEMU command line option 2023-01-09 13:50:47 +01:00
storage-daemon qsd: Unlink absolute PID file path 2022-07-12 14:30:38 +02:00
stubs async: Register/unregister aiocontext in graph lock list 2022-12-15 16:07:43 +01:00
subprojects libvhost-user: Switch to unsigned int for inuse field in struct VuVirtq 2022-12-21 07:32:24 -05:00
target i386: Emit correct error code for 64-bit IDT entry 2023-01-11 09:59:38 +01:00
tcg tcg/s390x improvements: 2023-01-08 11:23:17 +00:00
tests * s390x header clean-ups from Philippe 2023-01-09 15:54:31 +00:00
tools cleanup: Tweak and re-run return_directly.cocci 2022-12-14 16:19:35 +01:00
trace include/hw/core: Create struct CPUJumpCache 2022-10-04 12:13:12 -07:00
ui include/hw/pci: Split pci_device.h off pci.h 2023-01-08 01:54:22 -05:00
util accel: introduce accelerator blocker API 2023-01-11 09:59:39 +01:00
.cirrus.yml ci: Upgrade msys2 release to 20220603 2022-07-29 10:33:29 -07:00
.dir-locals.el
.editorconfig .editorconfig: update the automatic mode setting for Emacs 2021-03-10 15:34:11 +00:00
.exrc
.gdbinit
.gitattributes gitattributes: Cover Objective-C source files 2022-03-29 00:15:14 +02:00
.gitignore .gitignore: add multiple items to .gitignore 2022-10-22 22:48:17 +02:00
.gitlab-ci.yml docs: Document GitLab custom CI/CD variables 2021-07-29 07:56:01 +02:00
.gitmodules Remove the slirp submodule (i.e. compile only with an external libslirp) 2022-09-26 17:23:47 +02:00
.gitpublish
.mailmap mailmap: Fix Stefan Weil author email 2022-12-13 15:56:57 -05:00
.patchew.yml scripts/checkpatch: roll diff tweaking into checkpatch itself 2021-06-25 10:08:33 +01:00
.readthedocs.yml readthedocs: build with Python 3.6 2020-10-05 16:30:45 +01:00
.travis.yml Revert "gitlab: disable accelerated zlib for s390x" 2022-07-20 12:15:09 +01:00
block.c block: GRAPH_RDLOCK for functions only called by co_wrappers 2022-12-15 16:08:23 +01:00
blockdev-nbd.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
blockdev.c block: Fix locking in external_snapshot_prepare() 2022-12-15 16:08:23 +01:00
blockjob.c block: Remove drained_end_counter 2022-12-15 16:07:42 +01:00
configure configure: fix GLIB_VERSION for cross-compilation 2023-01-11 09:59:38 +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.c accel/tcg: Complete cpu initialization before registration 2022-11-01 08:31:41 +11:00
cpus-common.c cpus: Introduce cpu_list_generation_id 2022-07-20 12:15:08 +01:00
disas.c disas: use result of ->read_memory_func 2022-10-06 11:53:40 +01:00
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 a new interns group-map for GSoC/Outreachy work 2021-07-23 17:22:16 +01:00
hmp-commands-info.hx hmp: add virtio commands 2022-10-09 16:38:45 -04:00
hmp-commands.hx qapi: net: add stream and dgram netdevs 2022-10-28 13:28:52 +08:00
iothread.c error: Move ERRP_GUARD() to the beginning of the function 2022-12-14 16:19:35 +01:00
job-qmp.c qapi job: Elide redundant has_FOO in generated C 2022-12-14 20:04:47 +01:00
job.c block: remove bdrv_try_set_aio_context and replace it with bdrv_try_change_aio_context 2022-10-27 20:14:11 +02:00
Kconfig meson: Introduce target-specific Kconfig 2021-07-09 18:21:34 +02:00
Kconfig.host vfio-user: build library 2022-06-15 16:42:33 +01:00
LICENSE tcg/LICENSE: Remove out of date claim about TCG subdirectory licensing 2019-11-11 15:11:21 +01:00
MAINTAINERS MAINTAINERS: Add MIPS-related docs and configs to the MIPS architecture section 2023-01-09 13:50:13 +01:00
Makefile configure: cleanup creation of tests/tcg target config 2022-10-06 11:53:40 +01:00
memory_ldst.c.inc exec/memory_ldst: Use correct type sizes 2021-05-26 08:35:51 -07:00
meson_options.txt target/hexagon: prepare input for the idef-parser 2022-12-16 11:36:50 -08:00
meson.build * Atomic memslot updates for KVM (Emanuele, David) 2023-01-08 14:27:40 +00:00
module-common.c
os-posix.c Refactoring: refactor TFR() macro to RETRY_ON_EINTR() 2023-01-09 13:50:47 +01:00
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.c include: move target page bits declaration to page-vary.h 2022-04-06 14:31:43 +02:00
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 qemu-img: Unify [-b [-F]] documentation 2022-02-01 13:49:15 +01:00
qemu-img.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
qemu-io-cmds.c block: Change blk_pwrite_compressed() param order 2022-07-12 12:14:56 +02:00
qemu-io.c include: move qemu_*_exec_dir() to cutils 2022-05-28 11:42:56 +02:00
qemu-keymap.c qemu-keymap: Add license in generated files 2021-12-17 10:41:50 +01:00
qemu-nbd.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
qemu-options.hx * s390x header clean-ups from Philippe 2023-01-09 15:54:31 +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 accel/tcg: Remove trace events from trace-root.h 2022-12-20 17:11:12 -08:00
VERSION Open 8.0 development tree 2022-12-13 15:56:26 -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>`_