QEMU With E2K User Support
8ee612722d
the negative file I/O performance impact when using a very low value for 9P client parameter 'msize', which especially is the case if no 'msize' parameter was supplied by the user with a 9P Linux client at all. All it does is logging a performance warning on host side (once) in that case. By setting 'msize' on client side to any value larger than 8192 the performance warning will disappear. See https://wiki.qemu.org/Documentation/9psetup#msize for details. -----BEGIN PGP SIGNATURE----- iQJLBAABCgA1FiEEltjREM96+AhPiFkBNMK1h2Wkc5UFAl9gmWwXHHFlbXVfb3Nz QGNydWRlYnl0ZS5jb20ACgkQNMK1h2Wkc5UbSA//edhciQPI7XX/jfxBd5OaxF28 2/iYY/dEDKcR+cywpXzZsDRvbEo+Sr6xxd0gPV0QnMIVzpUcGwf57L88NS2FcIBm u702t+ynUg/Za78siQ3CTVcIKT/Da5gIhJQzDJ+tjLjJePKGJBKxSVkEH/j5II9+ 9EVIW0SGis7OfRRTiXusxAjeIgGGOBpj8VXy72iaiWw2qig7Nb+ESs84p9DHBjbk 3w3jB8wZS/0q2M3KpBShm20tijW5Evt5xEJfMuxQDKsXfzHOTr8bHgAffVb2kvnD m0F5jEFyRdaInMtpHU6jtIMm9V0+Wny5UEjLnSBPSgB4mgNpnKoGeezCnIH3xZmt vGJSQK+83iBH+eOvEHNOD9MWggHjNZi7tqLDyEcmfE9BFS/FEckxpVsYOHLKsLrJ EBbpcrJGxlgTYIAbLeJ7XPWaidzSw3lrsJzdDSIL9Q2kzsx58iR1O45bJr8i++W0 OyDf5eTUASrZ6pKO74JF3DSwhiN6vsTHQzYDPSsoge+PUUfXVCtVkwXW/vW5csNJ 4Go//BDE5afkuP8doilxDHU4EvXDTiRnzSQn46lMb/n7zbTirIT6NQP8Yre7LS1L j8qOCA8V0aNBA4pZ3Iax9u00E628gbAgYl0rAh8cudIEPXS1MZNNdMv8Vn0XzMZM eEqcRH8aZArQsYY5ATE= =Ha0F -----END PGP SIGNATURE----- Merge remote-tracking branch 'remotes/cschoenebeck/tags/pull-9p-20200915' into staging The intention of the following two patches is making users aware about the negative file I/O performance impact when using a very low value for 9P client parameter 'msize', which especially is the case if no 'msize' parameter was supplied by the user with a 9P Linux client at all. All it does is logging a performance warning on host side (once) in that case. By setting 'msize' on client side to any value larger than 8192 the performance warning will disappear. See https://wiki.qemu.org/Documentation/9psetup#msize for details. # gpg: Signature made Tue 15 Sep 2020 11:37:32 BST # gpg: using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395 # gpg: issuer "qemu_oss@crudebyte.com" # gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.com>" [unknown] # gpg: WARNING: This key is not certified with a trusted signature! # gpg: There is no indication that the signature belongs to the owner. # Primary key fingerprint: ECAB 1A45 4014 1413 BA38 4926 30DB 47C3 A012 D5F4 # Subkey fingerprint: 96D8 D110 CF7A F808 4F88 5901 34C2 B587 65A4 7395 * remotes/cschoenebeck/tags/pull-9p-20200915: 9pfs: disable msize warning for synth driver 9pfs: log warning if msize <= 8192 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> |
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.github | ||
.gitlab-ci.d | ||
accel | ||
audio | ||
authz | ||
backends | ||
block | ||
bsd-user | ||
capstone@22ead3e0bf | ||
chardev | ||
contrib | ||
crypto | ||
default-configs | ||
disas | ||
docs | ||
dtc@85e5d83984 | ||
dump | ||
fpu | ||
fsdev | ||
gdb-xml | ||
hw | ||
include | ||
io | ||
libdecnumber | ||
linux-headers | ||
linux-user | ||
meson@68ed748f84 | ||
migration | ||
monitor | ||
nbd | ||
net | ||
pc-bios | ||
plugins | ||
po | ||
python/qemu | ||
qapi | ||
qga | ||
qobject | ||
qom | ||
replay | ||
roms | ||
scripts | ||
scsi | ||
slirp@ce94eba204 | ||
softmmu | ||
storage-daemon | ||
stubs | ||
target | ||
tcg | ||
tests | ||
tools | ||
trace | ||
ui | ||
util | ||
.cirrus.yml | ||
.dir-locals.el | ||
.editorconfig | ||
.exrc | ||
.gdbinit | ||
.gitignore | ||
.gitlab-ci.yml | ||
.gitmodules | ||
.gitpublish | ||
.mailmap | ||
.patchew.yml | ||
.readthedocs.yml | ||
.shippable.yml | ||
.travis.yml | ||
block.c | ||
blockdev-nbd.c | ||
blockdev.c | ||
blockjob.c | ||
bootdevice.c | ||
Changelog | ||
CODING_STYLE.rst | ||
configure | ||
COPYING | ||
COPYING.LIB | ||
cpus-common.c | ||
device_tree.c | ||
disas.c | ||
dma-helpers.c | ||
exec-vary.c | ||
exec.c | ||
gdbstub.c | ||
gitdm.config | ||
hmp-commands-info.hx | ||
hmp-commands.hx | ||
iothread.c | ||
job-qmp.c | ||
job.c | ||
Kconfig | ||
Kconfig.host | ||
LICENSE | ||
MAINTAINERS | ||
Makefile | ||
memory_ldst.c.inc | ||
meson_options.txt | ||
meson.build | ||
module-common.c | ||
os-posix.c | ||
os-win32.c | ||
qdev-monitor.c | ||
qemu-bridge-helper.c | ||
qemu-edid.c | ||
qemu-img-cmds.hx | ||
qemu-img.c | ||
qemu-io-cmds.c | ||
qemu-io.c | ||
qemu-keymap.c | ||
qemu-nbd.c | ||
qemu-options-wrapper.h | ||
qemu-options.h | ||
qemu-options.hx | ||
qemu-seccomp.c | ||
qemu.nsi | ||
qemu.sasl | ||
README.rst | ||
replication.c | ||
replication.h | ||
thunk.c | ||
tpm.c | ||
trace-events | ||
VERSION | ||
version.rc | ||
version.texi.in |
=========== 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>`_