QEMU With E2K User Support
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Kevin Wolf 30dd65f307 block: Fix cross-AioContext blockdev-snapshot
external_snapshot_prepare() tries to move the overlay to the AioContext
of the backing file (the snapshotted node). However, it's possible that
this doesn't work, but the backing file can instead be moved to the
overlay's AioContext (e.g. opening the backing chain for a mirror
target).

bdrv_append() already indirectly uses bdrv_attach_node(), which takes
care to move nodes to make sure they use the same AioContext and which
tries both directions.

So the problem has a simple fix: Just delete the unnecessary extra
bdrv_try_set_aio_context() call in external_snapshot_prepare() and
instead assert in bdrv_append() that both nodes were indeed moved to the
same AioContext.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200310113831.27293-6-kwolf@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-03-11 15:54:38 +01:00
.gitlab-ci.d/edk2 gitlab-ci.yml: Add jobs to build EDK2 firmware binaries 2020-01-21 14:15:48 +01:00
accel accel/tcg: increase default code gen buffer size for 64 bit 2020-02-28 17:43:31 -08:00
audio audio/alsaaudio: Remove superfluous semicolons 2020-02-18 20:20:49 +01:00
authz authz: fix usage of bool in listfile.c 2020-02-07 12:22:19 +00:00
backends hostmem: fix strict bind policy 2020-02-19 16:50:02 +00:00
block monitor/hmp: Move hmp_drive_add_node to block-hmp-cmds.c 2020-03-09 18:20:22 +00:00
bsd-user build: move TARGET_GPROF to config-host.mak 2020-02-12 16:29:27 +01:00
capstone@22ead3e0bf
chardev chardev: Improve error report by calling error_setg_win32() 2020-03-09 13:36:15 +01:00
contrib libvhost-user: implement in-band notifications 2020-02-27 03:46:10 -05:00
crypto * More uses of RCU_READ_LOCK_GUARD (Dave, myself) 2019-12-20 11:20:25 +00:00
default-configs tpm: Separate TPM_TIS and TPM_TIS_ISA configs 2020-03-05 12:18:00 -05:00
disas target/mips: Add implementation of GINVT instruction 2020-01-29 19:28:52 +01:00
docs net: Remove deprecated [hub_id name] tuple of 'hostfwd_add' / 'hostfwd_remove' 2020-03-09 18:44:04 +00:00
dtc@88f18909db
dump
fpu
fsdev virtfs-proxy-helper: Make the helper_opts[] array const 2020-03-09 15:59:31 +01:00
gdb-xml
hw s390x/ipl: Fixes for ipl and bios 2020-03-10 16:50:28 +00:00
include block: Make bdrv_get_cumulative_perm() public 2020-03-11 15:54:38 +01:00
io io/channel-websock: treat 'binary' and no sub-protocol as the same 2020-02-07 12:22:18 +00:00
libdecnumber
linux-headers linux-headers: update 2020-02-26 18:57:07 +01:00
linux-user target/arm: Implement v8.4-RCPC 2020-02-28 16:14:57 +00:00
migration savevm: Don't call colo_init_ram_cache twice 2020-02-28 10:13:54 +01:00
monitor monitor/hmp: move hmp_info_block* to block-hmp-cmds.c 2020-03-09 18:20:21 +00:00
nbd nbd: Fix regression with multiple meta contexts 2020-02-26 14:45:02 -06:00
net net: Remove deprecated [hub_id name] tuple of 'hostfwd_add' / 'hostfwd_remove' 2020-03-09 18:44:04 +00:00
pc-bios s390x/bios: rebuild s390-ccw.img 2020-03-10 10:18:13 +01:00
plugins plugins/core: add missing break in cb_to_tcg_flags 2020-02-25 20:20:23 +00:00
po
python/qemu python/qemu/machine: Allow to use other serial consoles than default 2020-02-07 15:12:48 +01:00
qapi block/rbd: Add support for ceph namespaces 2020-03-06 17:21:28 +01:00
qga qga: Fix a memory leak 2020-03-09 13:36:15 +01:00
qobject qstring: add qstring_free() 2020-01-24 20:59:13 +01:00
qom qom-qmp-cmds: fix two memleaks in qmp_object_add 2020-03-11 15:54:38 +01:00
replay replay: record and replay random number sources 2020-01-07 12:08:39 +01:00
roms hw/ppc/prep: Remove the deprecated "prep" machine and the OpenHackware BIOS 2020-02-02 14:07:57 +11:00
scripts maint: Include top-level *.rst files early in git diff 2020-03-09 15:59:31 +01:00
scsi
slirp@126c04acba
softmmu vl: Add missing "hw/boards.h" include 2020-03-09 15:59:31 +01:00
storage-daemon qemu-storage-daemon: Add --monitor option 2020-03-06 17:21:28 +01:00
stubs hmp: Fail gracefully if chardev is already in use 2020-03-06 17:21:28 +01:00
target s390x: ipl: Consolidate iplb validity check into one function 2020-03-10 10:18:20 +01:00
tcg tcg/arm: Expand epilogue inline 2020-02-28 10:58:41 -08:00
tests iotests: Test mirror with temporarily disabled target backing file 2020-03-11 15:54:38 +01:00
tools/virtiofsd virtiofsd: Fix xattr operations 2020-03-03 15:13:24 +00:00
trace tracing: only allow -trace to override -D if set 2020-02-25 20:20:23 +00:00
ui ui/cocoa.m: Update documentation file and pathname 2020-03-06 11:06:55 +00:00
util util/osdep: Improve error report by calling error_setg_win32() 2020-03-09 13:36:15 +01:00
.cirrus.yml ci: build out-of-tree 2019-12-18 20:17:55 +00:00
.dir-locals.el
.editorconfig
.exrc
.gdbinit
.gitignore docs: Stop building qemu-doc 2020-03-06 11:06:55 +00:00
.gitlab-ci-edk2.yml gitlab-ci.yml: Add jobs to build EDK2 firmware binaries 2020-01-21 14:15:48 +01:00
.gitlab-ci.yml configure: Enable test and libs for zstd 2020-02-28 09:24:43 +01:00
.gitmodules hw/ppc/prep: Remove the deprecated "prep" machine and the OpenHackware BIOS 2020-02-02 14:07:57 +11:00
.gitpublish
.mailmap mailmap: Add entry for Yu-Chen Lin 2020-02-18 20:20:49 +01:00
.patchew.yml
.readthedocs.yml .readthedocs.yml: specify some minimum python requirements 2020-02-07 15:15:16 +01:00
.shippable.yml .shippable: --disable-docs for cross-compile tests 2020-02-04 17:13:29 +00:00
.travis.yml travis.yml: install python3 numpy and opencv libraries 2020-03-04 09:57:33 +00:00
arch_init.c
balloon.c
block.c block: Fix cross-AioContext blockdev-snapshot 2020-03-11 15:54:38 +01:00
blockdev-nbd.c blockdev-nbd: Boxed argument type for nbd-server-add 2020-03-06 17:21:28 +01:00
blockdev.c block: Fix cross-AioContext blockdev-snapshot 2020-03-11 15:54:38 +01:00
blockjob.c
bootdevice.c
Changelog
CODING_STYLE.rst
configure qemu-storage-daemon: Add barebone tool 2020-03-06 17:15:38 +01:00
COPYING
COPYING.LIB
cpus-common.c
cpus.c Wrapper function to wait on condition for the main loop mutex 2020-02-03 11:33:10 +11:00
device_tree.c
disas.c
dma-helpers.c Avoid address_space_rw() with a constant is_write argument 2020-02-20 14:47:08 +01:00
exec-vary.c
exec.c Memory: Only call ramblock_ptr when needed in qemu_ram_writeback 2020-02-27 11:50:30 +00:00
gdbstub.c hmp: Fail gracefully if chardev is already in use 2020-03-06 17:21:28 +01:00
gitdm.config
hmp-commands-info.hx *.hx: Remove all the STEXI/ETEXI blocks 2020-03-06 11:06:55 +00:00
hmp-commands.hx net: Remove deprecated [hub_id name] tuple of 'hostfwd_add' / 'hostfwd_remove' 2020-03-09 18:44:04 +00:00
ioport.c
iothread.c
job-qmp.c
job.c
Kconfig.host
LICENSE
MAINTAINERS monitor/hmp: rename device-hotplug.c to block/monitor/block-hmp-cmds.c 2020-03-09 18:05:31 +00:00
Makefile build-sys: Move the print-variable rule to rules.mak 2020-03-09 15:59:31 +01:00
Makefile.objs monitor/hmp: rename device-hotplug.c to block/monitor/block-hmp-cmds.c 2020-03-09 18:05:31 +00:00
Makefile.target fuzz: add target/fuzz makefile rules 2020-02-22 08:26:48 +00:00
memory_ldst.inc.c
memory_mapping.c
memory.c memory: batch allocate ioeventfds[] in address_space_update_ioeventfds() 2020-02-25 09:18:01 +01:00
module-common.c
os-posix.c
os-win32.c
qdev-monitor.c virtio, pc: fixes, features 2020-02-27 19:15:15 +00:00
qemu-bridge-helper.c
qemu-edid.c
qemu-img-cmds.hx qemu-img: Add --target-is-zero to convert 2020-02-20 16:43:42 +01:00
qemu-img.c qemu-img: Fix convert -n -B for backing-less targets 2020-02-20 16:43:42 +01:00
qemu-io-cmds.c
qemu-io.c qemu-io: adds option to use aio engine 2020-01-30 20:59:42 +00:00
qemu-keymap.c
qemu-nbd.c qemu-nbd: Removed deprecated --partition option 2020-02-05 17:29:49 -06:00
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx *.hx: Remove all the STEXI/ETEXI blocks 2020-03-06 11:06:55 +00:00
qemu-seccomp.c
qemu-storage-daemon.c qemu-storage-daemon: Add --monitor option 2020-03-06 17:21:28 +01:00
qemu.nsi qemu.nsi: Install Sphinx documentation 2020-03-09 16:45:00 +00:00
qemu.sasl
qtest.c qtest: fix fuzzer-related 80-char limit violations 2020-03-06 10:33:26 +00:00
README.rst
replication.c
replication.h
rules.mak build-sys: Move the print-variable rule to rules.mak 2020-03-09 15:59:31 +01:00
thunk.c
tpm.c
trace-events
VERSION
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.


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://git.qemu.org/git/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 CODING_STYLE.rst file.

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://git.qemu.org/git/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>`_


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>`_