QEMU With E2K User Support
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Peng Tao b17fbbe55c migration: allow private destination ram with x-ignore-shared
By removing the share ram check, qemu is able to migrate
to private destination ram when x-ignore-shared capability
is on. Then we can create multiple destination VMs based
on the same source VM.

This changes the x-ignore-shared migration capability to
work similar to Lai's original bypass-shared-memory
work(https://lists.gnu.org/archive/html/qemu-devel/2018-04/msg00003.html)
which enables kata containers (https://katacontainers.io)
to implement the VM templating feature.

An example usage in kata containers(https://katacontainers.io):
1. Start the source VM:
   qemu-system-x86 -m 2G \
     -object memory-backend-file,id=mem0,size=2G,share=on,mem-path=/tmpfs/template-memory \
     -numa node,memdev=mem0
2. Stop the template VM, set migration x-ignore-shared capability,
   migrate "exec:cat>/tmpfs/state", quit it
3. Start target VM:
   qemu-system-x86 -m 2G \
     -object memory-backend-file,id=mem0,size=2G,share=off,mem-path=/tmpfs/template-memory \
     -numa node,memdev=mem0 \
     -incoming defer
4. connect to target VM qmp, set migration x-ignore-shared capability,
migrate_incoming "exec:cat /tmpfs/state"
5. create more target VMs repeating 3 and 4

Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Yury Kotov <yury-kotov@yandex-team.ru>
Cc: Jiangshan Lai <laijs@hyper.sh>
Cc: Xu Wang <xu@hyper.sh>
Signed-off-by: Peng Tao <tao.peng@linux.alibaba.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <1560494113-1141-1-git-send-email-tao.peng@linux.alibaba.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2019-07-15 15:39:03 +02:00
accel kvm: Support KVM_CLEAR_DIRTY_LOG 2019-07-15 15:39:03 +02:00
audio fix microphone lag with PA 2019-07-03 08:50:56 +02:00
authz Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
backends general: Replace global smp variables with smp machine properties 2019-07-05 17:07:36 -03:00
block file-posix: Use max transfer length/segment count only for SCSI passthrough 2019-07-12 15:42:23 +02:00
bsd-user Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
capstone@22ead3e0bf
chardev monitor: Replace monitor_init() with monitor_init_{hmp, qmp}() 2019-06-18 08:14:17 +02:00
contrib libvhost-user: implement VHOST_USER_PROTOCOL_F_MQ 2019-07-04 17:00:32 -04:00
crypto Normalize position of header guard 2019-06-12 13:20:20 +02:00
default-configs MIPS queue for July 2nd, 2019 2019-07-03 21:19:03 +01:00
disas disas/riscv: Fix rdinstreth constraint 2019-06-27 02:47:04 -07:00
docs docs/bitmaps: use QMP lexer instead of json 2019-07-10 15:08:07 -04:00
dtc@88f18909db
dump dump: Move HMP command handlers to dump/ 2019-07-02 13:37:00 +02:00
fpu hardfloat: fix float32/64 fused multiply-add 2019-03-25 10:35:32 +00:00
fsdev Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
gdb-xml RISC-V: Add 64-bit gdb xml files. 2019-03-19 05:13:24 -07:00
hw virtio pmem: remove transitional names 2019-07-12 10:57:27 -04:00
include migration: Split log_clear() into smaller chunks 2019-07-15 15:39:03 +02:00
io Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
libdecnumber
linux-headers linux-headers: sync with latest KVM headers from Linux 5.2 2019-06-21 13:23:47 +02:00
linux-user RISC-V Patches for the 4.1 Soft Freeze, Part 2 v3 2019-07-04 11:09:19 +01:00
migration migration: allow private destination ram with x-ignore-shared 2019-07-15 15:39:03 +02:00
monitor Fix build error when VNC is configured out 2019-07-15 11:26:26 +01:00
nbd nbd/server: Nicer spelling of max BLOCK_STATUS reply length 2019-06-13 08:56:10 -05:00
net COLO-compare: Add colo-compare remote notify support 2019-07-02 10:21:07 +08:00
pc-bios pseries: Update SLOF firmware image 2019-07-12 15:49:46 +10:00
po
python/qemu machine.py: minor delinting 2019-07-01 19:02:10 -03:00
qapi qmp: Add "alias-of" field to query-cpu-definitions 2019-07-05 17:08:04 -03:00
qga Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qobject qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h 2019-06-11 20:22:09 +02:00
qom qom: Move HMP command handlers to qom/ 2019-07-02 13:36:49 +02:00
replay Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
roms pseries: Update SLOF firmware image 2019-07-12 15:49:46 +10:00
scripts Bugfixes. 2019-07-08 10:26:18 +01:00
scsi Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
slirp@f0da672620 Update upstream slirp 2019-05-09 09:58:57 +02:00
stubs monitor: Replace monitor_init() with monitor_init_{hmp, qmp}() 2019-06-18 08:14:17 +02:00
target tcg: Introduce set/clear_helper_retaddr 2019-07-14 12:19:00 +02:00
tcg tcg/aarch64: Fix output of extract2 opcodes 2019-07-14 12:19:00 +02:00
tests bitmap: Add bitmap_copy_with_{src|dst}_offset() 2019-07-15 15:39:02 +02:00
trace Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
ui console: fix cell overflow 2019-07-03 10:57:12 +02:00
util bitmap: Add bitmap_copy_with_{src|dst}_offset() 2019-07-15 15:39:02 +02:00
.cirrus.yml cirrus / travis: Add gnu-sed and bash for macOS and FreeBSD 2019-05-21 10:12:47 +02:00
.dir-locals.el
.editorconfig editorconfig: add setting for shell scripts 2019-06-12 17:53:22 +01:00
.exrc
.gdbinit
.gitignore Makefile: install the edk2 firmware images and their descriptors 2019-04-17 15:38:35 +02:00
.gitlab-ci.yml gitlab-ci.yml: Test the TCG interpreter in a CI pipeline 2019-05-02 16:56:33 +02:00
.gitmodules gitmodules: use qemu.org git mirrors 2019-05-03 13:56:56 +01:00
.gitpublish
.mailmap
.patchew.yml ci: store Patchew configuration in the tree 2019-06-03 14:03:02 +02:00
.shippable.yml
.travis.yml .travis.yml: force a brew update for MacOS builds 2019-07-04 19:23:07 +01:00
arch_init.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
balloon.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
block.c block: Ignore loosening perm restrictions failures 2019-06-18 16:41:10 +02:00
blockdev-nbd.c nbd: allow authorization with nbd-server-start QMP command 2019-03-06 11:05:27 -06:00
blockdev.c blockdev: enable non-root nodes for transaction drive-backup source 2019-06-24 15:53:01 +02:00
blockjob.c block: drop bs->job 2019-06-18 16:41:10 +02:00
bootdevice.c
bt-host.c
bt-vhci.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
Changelog
CODING_STYLE CODING_STYLE: indent example code as all others 2019-05-02 18:12:58 +02:00
configure Build system patches for 2019-07-02 2019-07-04 15:58:46 +01:00
COPYING
COPYING.LIB
cpus-common.c
cpus.c general: Replace global smp variables with smp machine properties 2019-07-05 17:07:36 -03:00
device_tree.c device_tree: Fix integer overflowing in load_device_tree() 2019-04-09 16:35:40 -07:00
device-hotplug.c hmp: Fix drive_add ... format=help crash 2019-04-08 17:42:06 +02:00
disas.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
dma-helpers.c
exec.c memory: Introduce memory listener hook log_clear() 2019-07-15 15:39:02 +02:00
gdbstub.c gdbstub: revert to previous set_reg behaviour 2019-07-10 10:54:46 +01:00
gitdm.config contrib: gitdm: add a mapping for Janus Technologies 2019-03-12 19:31:29 +00:00
HACKING
hmp-commands-info.hx {hmp, hw/pvrdma}: Expose device internals via monitor interface 2019-03-16 15:52:44 +02:00
hmp-commands.hx net/announce: Add HMP optional ID 2019-07-02 10:21:07 +08:00
ioport.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
iothread.c iothread: document about why we need explicit aio_poll() 2019-03-08 10:20:57 +00:00
job-qmp.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
job.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
Kconfig.host kconfig: add dependencies on CONFIG_MSI_NONBROKEN 2019-03-18 09:39:57 +01:00
LICENSE
MAINTAINERS MAINTAINERS: update RBD block maintainer 2019-07-08 16:00:26 +02:00
Makefile Makefile: Fix "make clean" in "unconfigured" source directory 2019-07-09 16:17:38 +01:00
Makefile.objs dump: Move HMP command handlers to dump/ 2019-07-02 13:37:00 +02:00
Makefile.target Bugfixes. 2019-07-08 10:26:18 +01:00
memory_ldst.inc.c
memory_mapping.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
memory.c memory: Introduce memory listener hook log_clear() 2019-07-15 15:39:02 +02:00
module-common.c
os-posix.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
os-win32.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qdev-monitor.c qom: Move HMP command handlers to qom/ 2019-07-02 13:36:49 +02:00
qemu-bridge-helper.c qemu-bridge-helper: Document known shortcomings 2019-07-02 10:21:06 +08:00
qemu-deprecated.texi docs: Deprecate CPU model runnability guarantees 2019-07-05 17:08:04 -03:00
qemu-doc.texi docs: add Security chapter to the documentation 2019-05-10 10:53:52 +01:00
qemu-edid.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-ga.texi doc: fix the configuration path 2019-05-03 13:03:04 +02:00
qemu-img-cmds.hx qemu-img: Add salvaging mode to convert 2019-06-14 14:16:57 +02:00
qemu-img.c block: include base when checking image chain for block allocation 2019-07-02 03:53:04 +02:00
qemu-img.texi qemu-img: Add salvaging mode to convert 2019-06-14 14:16:57 +02:00
qemu-io-cmds.c qemu-io-cmds: use clock_gettime for benchmarking 2019-06-12 17:53:22 +01:00
qemu-io.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-keymap.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-nbd.c qemu-nbd: Do not close stderr 2019-06-13 08:50:47 -05:00
qemu-nbd.texi qemu-nbd: Add --pid-file option 2019-06-13 08:50:47 -05:00
qemu-option-trace.texi
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx vl.c: Add -smp, dies=* command line support and update doc 2019-07-05 17:08:04 -03:00
qemu-seccomp.c seccomp: report more useful errors from seccomp 2019-03-27 13:11:38 +01:00
qemu-tech.texi qemu-tech.texi: Remove "QEMU compared to other emulators" section 2019-06-17 15:35:31 +01:00
qemu.nsi
qemu.sasl
qtest.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
README
replication.c
replication.h Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
rules.mak contrib: add vhost-user-gpu 2019-05-29 06:30:45 +02:00
thunk.c thunk: improve readability of allocation loop 2019-03-11 18:48:20 +01:00
tpm.c
trace-events Move monitor.c to monitor/misc.c 2019-06-17 20:36:56 +02:00
VERSION Update version for v4.1.0-rc0 release 2019-07-09 17:21:53 +01:00
version.rc
vl.c vl: add qemu_add_vm_change_state_handler_prio() 2019-07-08 16:00:26 +02:00

         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:

  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.

   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 HACKING and CODING_STYLE files.

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.

  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:

  $ 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:

  $ 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

 - 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

-- End