QEMU With E2K User Support
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Greg Kurz c4f5dcc436 virtio-scsi: Configure all host notifiers in a single MR transaction
This allows the virtio-scsi-pci device to batch the setup of all its
host notifiers. This significantly improves boot time of VMs with a
high number of vCPUs, e.g. from 6m5.563s down to 1m2.884s for a
pseries machine with 384 vCPUs.

Note that memory_region_transaction_commit() must be called before
virtio_bus_cleanup_host_notifier() because the latter might close
ioeventfds that the transaction still assumes to be around when it
commits.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20210407143501.244343-5-groug@kaod.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-05-14 10:26:18 -04:00
.github .github: point Repo Lockdown bot to GitLab repo 2021-02-09 20:53:56 +00:00
.gitlab-ci.d gitlab: default to not building the documentation 2021-03-24 14:25:48 +00:00
accel accel/tcg: avoid re-translating one-shot instructions 2021-04-17 18:51:14 +01:00
audio coreaudio: Handle output device change 2021-03-16 07:17:50 +01:00
authz
backends dbus-vmstate: Increase the size of input stream buffer used during load 2021-04-01 15:27:44 +04:00
block block/nbd: fix possible use after free of s->connect_thread 2021-04-13 15:35:12 +02:00
bsd-user exec: Use cpu_untagged_addr in g2h; split out g2h_untagged 2021-02-16 11:04:53 +00:00
capstone@f8b1b83301
chardev chardev: Fix yank with the chardev-change case 2021-04-01 15:27:44 +04:00
contrib vhost-user-gpu: fix cursor move/update 2021-03-26 06:37:03 +01:00
crypto crypto: add reload for QCryptoTLSCredsClass 2021-03-23 08:48:21 +01:00
default-configs m68k: add Virtual M68k Machine 2021-03-15 21:03:06 +01:00
disas osdep: protect qemu/osdep.h with extern "C" 2021-04-17 18:44:30 +01:00
docs sphinx: qapidoc: Wrap "If" section body in a paragraph node 2021-04-13 10:14:58 +01:00
dtc@85e5d83984
dump qapi: More complex uses of QAPI_LIST_APPEND 2021-01-28 08:08:45 +01:00
fpu
fsdev meson: Declare have_virtfs_proxy_helper in main meson.build 2021-01-23 15:55:04 -05:00
gdb-xml
hw virtio-scsi: Configure all host notifiers in a single MR transaction 2021-05-14 10:26:18 -04:00
include pc-dimm: remove unnecessary get_vmstate_memory_region() method 2021-05-14 10:26:18 -04:00
io io: error_prepend() in qio_channel_readv_full_all() causes segfault 2021-02-12 07:50:59 -06:00
libdecnumber
linux-headers Update linux headers to 5.11-rc2 2021-01-21 11:19:45 +01:00
linux-user linux-user: Use signed lengths in uaccess.c 2021-04-07 18:55:27 +02:00
meson@776acd2a80
migration migration: Rename 'bs' to 'block' in background snapshot code 2021-04-07 18:37:56 +01:00
monitor qmp: add new qmp display-reload 2021-03-23 08:48:21 +01:00
nbd nbd: server: Report holes for raw images 2021-03-08 13:08:45 -06:00
net net: check the existence of peer before trying to pad 2021-04-23 11:11:28 +01:00
pc-bios Update OpenBIOS images to 4a004110 built from submodule. 2021-03-16 20:03:00 +00:00
plugins plugins: getting qemu_plugin_get_hwaddr only expose one function prototype 2021-03-17 07:17:46 +00:00
po
python Python: close the log file kept by QEMUMachine before reading it 2021-02-15 21:40:16 -05:00
qapi migration: Deprecate redundant query-migrate result @blocked 2021-04-20 10:50:34 +01:00
qga qga: fix guest-get-disks regression 2021-04-20 16:27:45 +01:00
qobject qobject: braces {} are necessary for all arms of this statement 2021-02-04 13:20:29 +01:00
qom * Updates for the MAINTAINERS file 2021-04-01 23:34:16 +01:00
replay replay: notify CPU on event 2021-04-01 10:37:20 +02:00
roms Update OpenBIOS images to 4a004110 built from submodule. 2021-03-16 20:03:00 +00:00
scripts device-crash-test: Ignore errors about a bus not being available 2021-04-01 14:28:39 +02:00
scsi scsi: fix sense code for EREMOTEIO 2021-03-16 14:30:30 -04:00
semihosting semihosting/arm-compat-semi: don't use SET_ARG to report SYS_HEAPINFO 2021-03-24 14:25:11 +00:00
slirp@8f43a99191
softmmu icount: get rid of static variable 2021-04-01 09:40:45 +02:00
storage-daemon qsd: Document FUSE exports 2021-03-29 18:28:33 +02:00
stubs yank: Always link full yank code 2021-04-01 15:27:44 +04:00
subprojects/libvhost-user build-sys: add libvhost-user missing dependencies 2021-01-23 09:26:41 -05:00
target target/s390x: fix s390_probe_access to check PAGE_WRITE_ORG for writeability 2021-04-23 14:10:56 +01:00
tcg tcg/mips: Fix SoftTLB comparison on mips backend 2021-04-05 07:32:56 -07:00
tests tests/qtest: add tests for am53c974 device 2021-04-12 22:37:11 +01:00
tools virtiofsd: Fix security.capability comparison 2021-04-06 18:56:01 +01:00
trace trace: fix "-trace file=..." 2021-03-06 11:42:57 +01:00
ui vnc: support reload x509 certificates for vnc 2021-03-23 08:48:21 +01:00
util spapr: rollback 'unplug timeout' for CPU hotunplugs 2021-04-12 12:27:14 +10:00
.cirrus.yml cirrus.yml: Update the FreeBSD task to version 12.2 2021-03-24 14:25:34 +00:00
.dir-locals.el
.editorconfig .editorconfig: update the automatic mode setting for Emacs 2021-03-10 15:34:11 +00:00
.exrc
.gdbinit
.gitattributes maint: Tell git that *.py files should use python diff hunks 2021-02-15 22:13:34 -05:00
.gitignore
.gitlab-ci.yml gitlab-ci.yml: Test the dtrace backend in one of the jobs 2021-04-06 15:04:50 +01:00
.gitmodules gitmodules: use GitLab repos instead of qemu.org 2021-02-09 20:53:56 +00:00
.gitpublish
.mailmap
.patchew.yml
.readthedocs.yml
.travis.yml travis.yml: Limit simultaneous jobs to 3 2021-02-19 06:31:40 +01:00
block.c block: remove format defaults from QemuOpts in bdrv_create_file() 2021-03-19 10:15:06 +01:00
blockdev-nbd.c qemu-nbd: Use SOMAXCONN for socket listen() backlog 2021-02-12 07:42:08 -06:00
blockdev.c blockdev: with -drive if=virtio, use generic virtio-blk 2021-03-24 14:25:48 +00:00
blockjob.c nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
configure tests/tcg: add concept of container_hosts 2021-04-06 15:04:42 +01:00
COPYING
COPYING.LIB
cpu.c accel/tcg: split TCG-only code from cpu_exec_realizefn 2021-02-05 10:24:14 -10:00
cpus-common.c
disas.c
gdbstub.c Pull request 2021-03-11 18:55:27 +00:00
gitdm.config
hmp-commands-info.hx migrate: remove QMP/HMP commands for speed, downtime and cache size 2021-03-18 09:22:55 +00:00
hmp-commands.hx block: Remove monitor command block_passwd 2021-03-23 22:31:56 +01:00
iothread.c multi-process: define MPQemuMsg format and transmission functions 2021-02-10 09:23:28 +00:00
job-qmp.c qapi: Use QAPI_LIST_APPEND in trivial cases 2021-01-28 08:08:45 +01:00
job.c job: Allow complete for jobs on standby 2021-04-09 18:00:29 +02:00
Kconfig semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
Kconfig.host multi-process: Add config option for multi-process QEMU 2021-02-09 20:53:56 +00:00
LICENSE
MAINTAINERS tests/qtest: add tests for am53c974 device 2021-04-12 22:37:11 +01:00
Makefile build-sys: invoke ninja with -d keepdepfile 2021-03-06 11:42:57 +01:00
memory_ldst.c.inc fuzz: ignore address_space_map is_write flag 2021-02-08 14:43:54 +01:00
meson_options.txt multiprocess: move feature to meson_options.txt 2021-02-25 14:14:32 +01:00
meson.build exec: Build page-vary-common.c with -fno-lto 2021-03-23 19:36:47 -06:00
module-common.c
os-posix.c os: deprecate the -enable-fips option and QEMU's FIPS enforcement 2021-01-29 17:07:53 +00:00
os-win32.c
page-vary-common.c exec: Build page-vary-common.c with -fno-lto 2021-03-23 19:36:47 -06:00
page-vary.c exec: Build page-vary-common.c with -fno-lto 2021-03-23 19:36:47 -06:00
qemu-bridge-helper.c
qemu-edid.c
qemu-img-cmds.hx
qemu-img.c qemu-img: Use user_creatable_process_cmdline() for --object 2021-03-19 10:17:14 +01:00
qemu-io-cmds.c
qemu-io.c qemu-io: Use user_creatable_process_cmdline() for --object 2021-03-19 10:17:14 +01:00
qemu-keymap.c
qemu-nbd.c qemu-nbd: Use user_creatable_process_cmdline() for --object 2021-03-19 10:17:14 +01:00
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx usb: Remove "-usbdevice ccid" 2021-03-26 06:37:03 +01:00
qemu.nsi nsis: adjust for new MinGW paths 2021-01-23 15:55:05 -05:00
qemu.sasl
README.rst README: Add Documentation blurb 2021-03-12 15:46:30 +01:00
replication.c
replication.h
thunk.c
trace-events
VERSION Update version for v6.0.0 release 2021-04-29 18:05:29 +01:00
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://qemu.org/Hosts/Linux>`_
* `<https://qemu.org/Hosts/Mac>`_
* `<https://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://qemu.org/Contribute/SubmitAPatch>`_
* `<https://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 Launchpad as its primary upstream bug tracker. Bugs
found when running code built from QEMU git or upstream released sources
should be reported via:

* `<https://bugs.launchpad.net/qemu/>`_

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:

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