QEMU With E2K User Support
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Akihiko Odaki d9b33018a0 Revert "tap: setting error appropriately when calling net_init_tap_one()"
This reverts commit 46d4d36d0b.

The reverted commit changed to emit warnings instead of errors when
vhost is requested but vhost initialization fails if vhostforce option
is not set.

However, vhostforce is not meant to ignore vhost errors. It was once
introduced as an option to commit 5430a28fe4 ("vhost: force vhost off
for non-MSI guests") to force enabling vhost for non-MSI guests, which
will have worse performance with vhost. The option was deprecated with
commit 1e7398a140 ("vhost: enable vhost without without MSI-X") and
changed to behave identical with the vhost option for compatibility.

Worse, commit bf769f742c ("virtio: del net client if net_init_tap_one
failed") changed to delete the client when vhost fails even when the
failure only results in a warning. The leads to an assertion failure
for the -netdev command line option.

The reverted commit was intended to avoid that the vhost initialization
failure won't result in a corrupted netdev. This problem should have
been fixed by deleting netdev when the initialization fails instead of
ignoring the failure with an arbitrary option. Fortunately, commit
bf769f742c ("virtio: del net client if net_init_tap_one failed"),
mentioned earlier, implements this behavior.

Restore the correct semantics and fix the assertion failure for the
-netdev command line option by reverting the problematic commit.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2024-03-29 14:59:07 +08:00
.github/workflows
.gitlab/issue_templates
.gitlab-ci.d gitlab: aggressively avoid extra GIT data 2024-03-20 09:52:27 +00:00
accel bulk: Call in place single use cpu_env() 2024-03-12 11:46:16 +01:00
audio audio: Depend on dbus_display1_dep 2024-02-16 17:27:22 +04:00
authz
backends backends/iommufd: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
block block-backend: fix edge case in bdrv_next_cleanup() where BDS associated to BB changes 2024-03-26 14:21:26 +01:00
bsd-user gdbstub: Save target's siginfo 2024-03-13 11:43:52 +00:00
chardev Revert "chardev: use a child source for qio input source" 2024-03-19 20:17:12 +00:00
common-user
configs mips: do not list individual devices from configs/ 2024-03-08 15:51:22 +01:00
contrib contrib/plugins/execlog: Fix compiler warning 2024-03-26 14:32:51 +01:00
crypto crypto: query gcrypt for cipher availability 2024-03-19 20:17:12 +00:00
disas target/riscv: honour show_opcodes when disassembling 2024-03-06 12:35:51 +00:00
docs docs/system/ppc/amigang.rst: Fix formatting 2024-03-26 14:24:06 +01:00
dump dump: Fix HMP dump-guest-memory -z without -R 2024-01-30 21:20:20 +03:00
ebpf ebpf: Fix indirections table setting 2024-03-29 14:59:00 +08:00
fpu
fsdev configure, meson: rename targetos to host_os 2023-12-31 09:11:29 +01:00
gdb-xml
gdbstub gdbstub: Fix double close() of the follow-fork-mode socket 2024-03-13 11:43:52 +00:00
host/include
hw hw/net/net_tx_pkt: Fix virtio header without checksum offloading 2024-03-29 14:59:07 +08:00
include Revert "tap: setting error appropriately when calling net_init_tap_one()" 2024-03-29 14:59:07 +08:00
io io: Introduce qio_channel_file_new_dupfd 2024-03-12 15:22:23 -04:00
libdecnumber
linux-headers linux-headers: Update to Linux v6.8-rc6 2024-03-08 20:48:03 +10:00
linux-user final updates for 9.0 (testing, gdbstub): 2024-03-13 15:12:14 +00:00
migration migration/multifd: Fix clearing of mapped-ram zero pages 2024-03-22 12:12:08 -04:00
monitor monitor/hmp-cmds-target: Append a space in error message in gpa2hva() 2024-03-26 14:24:06 +01:00
nbd nbd/server: Fix race in draining the export 2024-03-18 12:38:02 +01:00
net Revert "tap: setting error appropriately when calling net_init_tap_one()" 2024-03-29 14:59:07 +08:00
pc-bios update edk2 binaries for arm, risc-v and x86 secure boot. 2024-03-19 16:42:10 +01:00
plugins plugins: cleanup codepath for previous inline operation 2024-03-06 12:35:50 +00:00
po
python
qapi qapi: document parameters of query-cpu-model-* QAPI commands 2024-03-26 06:36:08 +01:00
qga qga/qapi-schema: Refill doc comments to conform to current conventions 2024-03-26 06:36:08 +01:00
qobject
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/efi: use pure 64-bit build for edk2-x86_64-secure-code.fd 2024-03-19 16:42:10 +01:00
scripts tracetool: remove redundant --target-type / --target-name args 2024-03-12 14:52:07 -04:00
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
storage-daemon meson: remove config_targetos 2023-12-31 09:11:28 +01:00
stubs migration: privatize colo interfaces 2024-03-11 16:28:59 -04:00
subprojects libvhost-user: Mark mmap'ed region memory as MADV_DONTDUMP 2024-03-12 17:56:55 -04:00
system * fix use-after-free issue 2024-03-20 15:05:51 +00:00
target target/tricore/helper: Use correct string format in cpu_tlb_fill() 2024-03-26 14:24:06 +01:00
tcg tcg/aarch64: Fix tcg_out_brcond for test comparisons 2024-03-12 04:09:21 -10:00
tests iotests: add test for stream job with an unaligned prefetch read 2024-03-26 14:21:26 +01:00
tools ebpf: Updated eBPF program and skeleton. 2024-03-12 19:31:47 +08:00
trace tracing: install trace events file only if necessary 2023-12-27 05:01:55 -05:00
ui ui/cocoa: Use NSTrackingInVisibleRect 2024-03-26 14:32:54 +01:00
util coroutine: reserve 5,000 mappings 2024-03-21 13:14:30 -04:00
.dir-locals.el
.editorconfig
.exrc
.gdbinit
.git-blame-ignore-revs
.gitattributes
.gitignore
.gitlab-ci.yml
.gitmodules
.gitpublish
.mailmap mailmap: Fix Stefan Weil email 2024-01-30 21:20:20 +03:00
.patchew.yml
.readthedocs.yml readthodocs: fully specify a build environment 2024-01-12 13:23:48 +00:00
.travis.yml .travis.yml: Remove the unused xfslib-dev package 2024-03-25 09:57:32 +01:00
block.c error: Move ERRP_GUARD() to the beginning of the function 2024-03-12 11:45:45 +01:00
blockdev-nbd.c
blockdev.c blockdev: Fix blockdev-snapshot-sync error reporting for no medium 2024-03-18 13:13:08 +01:00
blockjob.c
configure configure: put all symlink creation together 2024-02-16 13:56:09 +01:00
COPYING
COPYING.LIB
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
gitdm.config
hmp-commands-info.hx hmp: Add option to info qtree to omit details 2024-03-09 19:17:01 +01:00
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
job.c
Kconfig
Kconfig.host
LICENSE
MAINTAINERS misc/pca955*: Move models under hw/gpio 2024-03-25 15:05:38 +01:00
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: remove dead dictionary access 2024-03-20 11:30:49 +01:00
module-common.c
os-posix.c qemu_init: increase NOFILE soft limit on POSIX 2024-02-09 12:47:58 +00:00
os-win32.c
page-vary-common.c
page-vary-target.c
pythondeps.toml
qemu-bridge-helper.c
qemu-edid.c
qemu-img-cmds.hx docs/devel/docs: Document .hx file syntax 2024-01-15 17:12:22 +00:00
qemu-img.c
qemu-io-cmds.c
qemu-io.c
qemu-keymap.c
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: Document the virtio-iommu-pci aw-bits option 2024-03-12 17:59:10 -04:00
qemu.nsi
qemu.sasl
README.rst
replication.c
trace-events
VERSION Update version for v9.0.0-rc1 release 2024-03-26 19:46:55 +00:00
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>`_