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Paolo Bonzini f7544edcd3 qemu-config: add error propagation to qemu_config_parse
This enables some simplification of vl.c via error_fatal, and improves
error messages.  Before:

  $ ./qemu-system-x86_64 -readconfig .
  qemu-system-x86_64: error reading file
  qemu-system-x86_64: -readconfig .: read config .: Invalid argument
  $ /usr/libexec/qemu-kvm -readconfig foo
  qemu-kvm: -readconfig foo: read config foo: No such file or directory

After:

  $ ./qemu-system-x86_64 -readconfig .
  qemu-system-x86_64: -readconfig .: Cannot read config file: Is a directory
  $ ./qemu-system-x86_64 -readconfig foo
  qemu-system-x86_64: -readconfig foo: Could not open 'foo': No such file or directory

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210226170816.231173-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-03-06 11:41:54 +01:00
.github .github: point Repo Lockdown bot to GitLab repo 2021-02-09 20:53:56 +00:00
.gitlab-ci.d gitlab: add fine grained job deps for all build jobs 2021-02-19 06:29:05 +01:00
accel accel: kvm: Add aligment assert for kvm_log_clear_one_slot 2021-03-06 11:41:54 +01:00
audio audio: space prohibited between function name and parenthesis'(' 2021-01-15 11:49:26 +01:00
authz authz-simple: Check that 'identity' property is set 2020-11-18 10:51:35 +00:00
backends hostmem: Don't report pmem attribute if unsupported 2021-02-18 18:34:47 -05:00
block qemu-config: add error propagation to qemu_config_parse 2021-03-06 11:41:54 +01:00
bsd-user exec: Use cpu_untagged_addr in g2h; split out g2h_untagged 2021-02-16 11:04:53 +00:00
capstone@f8b1b83301 capstone: Update to upstream "next" branch 2020-10-03 04:23:14 -05:00
chardev chardev: add nodelay option 2021-03-06 11:41:54 +01:00
contrib contrib: Open brace '{' following struct go on the same line 2021-02-18 08:17:27 +00:00
crypto crypto: Add spaces around operator 2021-01-29 17:07:53 +00:00
default-configs Hexagon build infrastructure 2021-02-18 08:25:06 -08:00
disas Hexagon (disas) disassembler 2021-02-18 07:48:22 -08:00
docs KVM: x86: deprecate -M kernel-irqchip=off except for -M isapc 2021-03-06 11:41:54 +01:00
dtc@85e5d83984 Makefile: dtc: update, build the libfdt target 2020-06-16 14:49:05 +01:00
dump qapi: More complex uses of QAPI_LIST_APPEND 2021-01-28 08:08:45 +01:00
fpu softfloat: Define misc operations for bfloat16 2020-08-28 10:48:07 -07:00
fsdev meson: Declare have_virtfs_proxy_helper in main meson.build 2021-01-23 15:55:04 -05:00
gdb-xml target/riscv: Remove built-in GDB XML files for CSRs 2021-01-16 10:57:21 -08:00
hw x86/pvh: extract only 4 bytes of start address for 32 bit kernels 2021-03-06 11:41:54 +01:00
include qemu-config: add error propagation to qemu_config_parse 2021-03-06 11:41:54 +01:00
io io: error_prepend() in qio_channel_readv_full_all() causes segfault 2021-02-12 07:50:59 -06:00
libdecnumber qemu/: fix some comment spelling errors 2020-09-17 20:35:43 +02:00
linux-headers Update linux headers to 5.11-rc2 2021-01-21 11:19:45 +01:00
linux-user Hexagon (linux-user/hexagon) Linux user emulation 2021-02-18 07:48:22 -08:00
meson@776acd2a80 submodules: bump meson to 0.55.3 2020-10-17 10:45:42 -04:00
migration migration: dirty-bitmap: Allow control of bitmap persistence 2021-02-12 15:24:36 -06:00
monitor monitor/qmp: Stop processing requests when shutdown is requested 2021-02-15 15:10:14 +01:00
nbd nbd/server: Quiesce coroutines on context switch 2021-01-20 14:48:54 -06:00
net Trivial patches 20210129 2021-01-29 10:10:43 +00:00
pc-bios pc-bios: update mirror URLs to GitLab 2021-02-09 20:53:56 +00:00
plugins accel/tcg: allow plugin instrumentation to be disable via cflags 2021-02-18 08:19:23 +00:00
po configure: move gettext detection to meson.build 2021-01-02 21:03:09 +01:00
python Python: close the log file kept by QEMUMachine before reading it 2021-02-15 21:40:16 -05:00
qapi chardev: do not use short form boolean options in non-QemuOpts character device descriptions 2021-02-25 15:41:53 +01:00
qga qga-vss: Use dynamic linking for GLib 2021-03-06 11:41:54 +01:00
qobject qobject: braces {} are necessary for all arms of this statement 2021-02-04 13:20:29 +01:00
qom qom: Check for wellformed id in user_creatable_add_type() 2021-03-06 11:41:54 +01:00
replay replay: fix icount request when replaying clock access 2021-02-16 17:15:39 +01:00
roms qboot: update to latest upstream 2020-11-20 10:48:53 -05:00
scripts * fix --enable-fuzzing linker failures (Alexander) 2021-03-02 15:17:45 +00:00
scsi scsi: introduce scsi_sense_from_errno() 2021-02-25 14:14:32 +01:00
slirp@8f43a99191 slirp: update to fix CVE-2020-29129 CVE-2020-29130 2020-11-27 20:57:11 +04:00
softmmu qemu-config: add error propagation to qemu_config_parse 2021-03-06 11:41:54 +01:00
storage-daemon qemu-storage-daemon: Enable object-add 2021-02-15 15:10:14 +01:00
stubs replay: fix icount request when replaying clock access 2021-02-16 17:15:39 +01:00
subprojects/libvhost-user build-sys: add libvhost-user missing dependencies 2021-01-23 09:26:41 -05:00
target KVM: x86: do not fail if software breakpoint has already been removed 2021-03-06 11:41:54 +01:00
tcg tcg/tci: Remove TCG_CONST 2021-02-05 10:24:14 -10:00
tests * fix --enable-fuzzing linker failures (Alexander) 2021-03-02 15:17:45 +00:00
tools virtiofs: drop remapped security.capability xattr as needed 2021-03-04 10:26:16 +00:00
trace trace: add meson custom_target() depend_files for tracetool 2021-02-01 10:50:55 +00:00
ui ui/console: Remove dpy_gl_ctx_get_current 2021-02-19 15:07:14 +01:00
util qemu-config: add error propagation to qemu_config_parse 2021-03-06 11:41:54 +01:00
.cirrus.yml cirrus/msys2: Cache msys2 mingw in a better way. 2021-01-12 12:38:03 +01:00
.dir-locals.el Add .dir-locals.el file to configure emacs coding style 2015-10-08 19:46:01 +03:00
.editorconfig meson: rename included C source files to .c.inc 2020-08-21 06:18:30 -04:00
.exrc
.gdbinit .gdbinit: load QEMU sub-commands when gdb starts 2017-06-07 14:38:45 +01:00
.gitattributes maint: Tell git that *.py files should use python diff hunks 2021-02-15 22:13:34 -05:00
.gitignore Makefile: add GNU global tags support 2021-01-18 10:04:31 +00:00
.gitlab-ci.yml gitlab-ci.yml: Run check-tcg with TCI 2021-02-19 06:29:05 +01:00
.gitmodules gitmodules: use GitLab repos instead of qemu.org 2021-02-09 20:53:56 +00:00
.gitpublish Add a git-publish configuration file 2018-03-05 09:03:17 +00:00
.mailmap MAINTAINERS: chenhc@lemote.com -> chenhuacai@kernel.org 2020-12-13 16:00:58 +01:00
.patchew.yml ci: store Patchew configuration in the tree 2019-06-03 14:03:02 +02:00
.readthedocs.yml readthedocs: build with Python 3.6 2020-10-05 16:30:45 +01:00
.travis.yml travis.yml: Limit simultaneous jobs to 3 2021-02-19 06:31:40 +01:00
block.c block: add bdrv_co_delete_file_noerr 2021-02-15 15:10:14 +01:00
blockdev-nbd.c qemu-nbd: Use SOMAXCONN for socket listen() backlog 2021-02-12 07:42:08 -06:00
blockdev.c block: use return status of bdrv_append() 2021-02-12 15:39:44 -06:00
blockjob.c blockjob: Fix crash with IOthread when block commit after snapshot 2021-02-15 15:10:14 +01:00
configure multiprocess: move feature to meson_options.txt 2021-02-25 14:14:32 +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: split TCG-only code from cpu_exec_realizefn 2021-02-05 10:24:14 -10:00
cpus-common.c overall/alpha tcg cpus|hppa: Fix Lesser GPL version number 2020-11-15 16:43:54 +01:00
disas.c disas: Push const down through host disassembly 2021-01-07 05:09:42 -10:00
exec-vary.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
gdbstub.c chardev: add nodelay option 2021-03-06 11:41:54 +01:00
gitdm.config contrib: gitdm: add a mapping for Janus Technologies 2019-03-12 19:31:29 +00:00
hmp-commands-info.hx replay: introduce info hmp/qmp command 2020-10-06 08:34:49 +02:00
hmp-commands.hx hmp: remove "change vnc TARGET" command 2021-01-23 15:55:07 -05:00
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: add .cancel handler for the driver 2021-02-12 11:23:19 -06:00
Kconfig Makefile: simplify MINIKCONF rules 2020-07-10 18:02:21 -04:00
Kconfig.host multi-process: Add config option for multi-process QEMU 2021-02-09 20:53:56 +00:00
LICENSE tcg/LICENSE: Remove out of date claim about TCG subdirectory licensing 2019-11-11 15:11:21 +01:00
MAINTAINERS MIPS patches queue 2021-02-21 19:52:58 +00:00
Makefile tests/docker: alias docker-help target for consistency 2021-02-08 09:41:00 +00:00
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 * fix --enable-fuzzing linker failures (Alexander) 2021-03-02 15:17:45 +00:00
module-common.c all: Clean up includes 2016-02-04 17:41:30 +00:00
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 vl: relocate paths to data directories 2020-09-30 19:11:36 +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: drop cast 2020-10-14 06:05:56 +02:00
qemu-img-cmds.hx qemu-img: add support for rate limit in qemu-img convert 2020-10-27 15:26:20 +01:00
qemu-img.c qapi: Use QAPI_LIST_APPEND in trivial cases 2021-01-28 08:08:45 +01:00
qemu-io-cmds.c qemu-io: add preallocate mode parameter for truncate command 2020-12-18 12:35:55 +01:00
qemu-io.c trace: remove argument from trace_init_file 2020-11-11 13:08:09 +00:00
qemu-keymap.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-nbd.c qemu-nbd: Permit --shared=0 for unlimited clients 2021-02-12 07:42:08 -06:00
qemu-options-wrapper.h qemu-img: remove references to GEN_DOCS 2018-05-20 08:35:54 +03:00
qemu-options.h Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
qemu-options.hx chardev: add nodelay option 2021-03-06 11:41:54 +01:00
qemu.nsi nsis: adjust for new MinGW paths 2021-01-23 15:55:05 -05:00
qemu.sasl Default to GSSAPI (Kerberos) instead of DIGEST-MD5 for SASL 2017-05-09 14:41:47 +01:00
README.rst docs: move CODING_STYLE into the developer documentation 2021-02-24 11:05:21 +00:00
replication.c replication: Introduce new APIs to do replication operation 2016-09-13 11:00:56 +01:00
replication.h Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
thunk.c overall usermode...: Fix Lesser GPL version number 2020-11-15 16:43:40 +01:00
trace-events trace-events: Fix attribution of trace points to source 2020-09-09 17:17:58 +01:00
VERSION Open 6.0 development tree 2020-12-08 21:04:57 +00:00
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.


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>`_