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Kevin Wolf 6d47eb0c8b qed: Don't yield in bdrv_qed_co_drain_begin()
We want to change .bdrv_co_drained_begin() back to be a non-coroutine
callback, so in preparation, avoid yielding in its implementation.

Because we increase bs->in_flight and bdrv_drained_begin() polls, the
behaviour is unchanged.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20221118174110.55183-2-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2022-12-15 16:07:42 +01:00
.github/workflows
.gitlab/issue_templates
.gitlab-ci.d gitlab: integrate coverage report 2022-11-22 09:52:23 +00:00
accel qapi: Use returned bool to check for failure (again) 2022-12-14 16:19:35 +01:00
audio qapi audio: Elide redundant has_FOO in generated C 2022-12-13 18:31:37 +01:00
authz
backends qapi tpm: Elide redundant has_FOO in generated C 2022-12-14 20:05:07 +01:00
block qed: Don't yield in bdrv_qed_co_drain_begin() 2022-12-15 16:07:42 +01:00
bsd-user Drop more useless casts from void * to pointer 2022-12-14 16:19:35 +01:00
chardev qapi chardev: Elide redundant has_FOO in generated C 2022-12-14 20:04:47 +01:00
common-user
configs hw/isa/Kconfig: Fix dependencies of piix4 southbridge 2022-10-31 11:32:07 +01:00
contrib Drop more useless casts from void * to pointer 2022-12-14 16:19:35 +01:00
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 qapi: Start to elide redundant has_FOO in generated C 2022-12-13 18:31:37 +01:00
dtc@b6910bec11
dump Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
ebpf
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 Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
include Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
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 Drop more useless casts from void * to pointer 2022-12-14 16:19:35 +01:00
meson@3a9b285a55 meson: require 0.61.3 2022-10-01 21:16:36 +02:00
migration Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
monitor Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
nbd nbd/server: Clean up abuse of BlockExportOptionsNbd member @arg 2022-12-13 18:31:37 +01:00
net Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +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
python misc: fix commonly doubled up words 2022-08-01 11:58:02 +02:00
qapi Block layer patches 2022-11-14 16:59:10 -05:00
qga Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
qobject
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 Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
scsi
semihosting cleanup: Tweak and re-run return_directly.cocci 2022-12-14 16:19:35 +01:00
softmmu Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
storage-daemon qsd: Unlink absolute PID file path 2022-07-12 14:30:38 +02:00
stubs qapi qdev qom: Elide redundant has_FOO in generated C 2022-12-14 20:05:07 +01:00
subprojects libvhost-user: Add format attribute to local function vu_panic 2022-11-27 13:33:58 -05:00
target Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
tcg tcg: Move TCG_TARGET_HAS_direct_jump init to tb_gen_code 2022-11-09 12:29:03 +11:00
tests Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +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 Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
util Miscellaneous patches for 2022-12-14 2022-12-15 10:13:46 +00:00
.cirrus.yml ci: Upgrade msys2 release to 20220603 2022-07-29 10:33:29 -07:00
.dir-locals.el
.editorconfig
.exrc
.gdbinit
.gitattributes
.gitignore .gitignore: add multiple items to .gitignore 2022-10-22 22:48:17 +02:00
.gitlab-ci.yml
.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
.readthedocs.yml
.travis.yml Revert "gitlab: disable accelerated zlib for s390x" 2022-07-20 12:15:09 +01:00
block.c block: refactor bdrv_list_refresh_perms to allow any list of nodes 2022-12-15 16:07:42 +01:00
blockdev-nbd.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
blockdev.c qapi transaction: Elide redundant has_FOO in generated C 2022-12-14 20:05:07 +01:00
blockjob.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
configure Run docker probe only if docker or podman are available 2022-11-22 09:48:52 +00:00
COPYING
COPYING.LIB
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
gitdm.config
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
Kconfig.host
LICENSE
MAINTAINERS MAINTAINERS: Add subprojects/libvhost-user to section "vhost" 2022-11-27 13:34:21 -05:00
Makefile configure: cleanup creation of tests/tcg target config 2022-10-06 11:53:40 +01:00
memory_ldst.c.inc
meson_options.txt gtk: disable GTK Clipboard with a new meson option 2022-11-23 12:15:06 +01:00
meson.build gtk: disable GTK Clipboard with a new meson option 2022-11-23 12:15:06 +01:00
module-common.c
os-posix.c os-posix: asynchronous teardown for shutdown on Linux 2022-10-31 09:46:34 +01:00
os-win32.c
page-vary-common.c
page-vary.c
qemu-bridge-helper.c
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.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
qemu-keymap.c
qemu-nbd.c qapi block: Elide redundant has_FOO in generated C 2022-12-14 20:03:25 +01:00
qemu-options.hx Fix several typos in documentation (found by codespell) 2022-11-11 09:39:25 +01:00
qemu.nsi
qemu.sasl
README.rst README.rst: fix link formatting 2022-08-04 13:44:21 +02:00
replication.c
trace-events gdbstub: move into its own sub directory 2022-10-06 11:53:41 +01:00
VERSION Open 8.0 development tree 2022-12-13 15:56:26 -05:00
version.rc

===========
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>`_