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Daniel P. Berrange f3fddaf60b trace: disallow more than 10 arguments per trace event
The UST trace backend can only cope with upto 10 arguments. To ensure we
don't exceed the limit when UST is not compiled in, disallow more than
10 arguments upfront.

This prevents the case where:

  commit 0fc8aec7de
  Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
  Date:   Tue Apr 18 10:20:20 2017 +0800

    COLO-compare: Optimize tcp compare trace event

    Optimize two trace events as one, adjust print format make
    it easy to read. rename trace_colo_compare_pkt_info_src/dst
    to trace_colo_compare_tcp_info.

regressed the fix done in

  commit 2dfe5113b1
  Author: Alex Bennée <alex.bennee@linaro.org>
  Date:   Fri Oct 28 14:25:59 2016 +0100

    net: split colo_compare_pkt_info into two trace events

    It seems there is a limit to the number of arguments a UST trace event
    can take and at 11 the previous trace command broke the build. Split the
    trace into a src pkt and dst pkt trace to fix this.

    Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
    Message-id: 20161028132559.8324-1-alex.bennee@linaro.org
    Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
    Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Now we get an immediate fail even when UST is disabled:

  GEN     net/trace.h
Traceback (most recent call last):
  File "/home/berrange/src/virt/qemu/scripts/tracetool.py", line 154, in <module>
    main(sys.argv)
  File "/home/berrange/src/virt/qemu/scripts/tracetool.py", line 145, in main
    events.extend(tracetool.read_events(fh))
  File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line 307, in read_events
    event = Event.build(line)
  File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line 244, in build
    event = Event(name, props, fmt, args)
  File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line 196, in __init__
    "argument count" % name)
ValueError: Event 'colo_compare_tcp_info' has more than maximum permitted argument count
Makefile:96: recipe for target 'net/trace.h-timestamp' failed

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20170426153900.21066-1-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-05-08 09:38:30 -04:00
audio audio: fix WAVState leak 2017-05-04 09:15:45 +02:00
backends hostmem: use host_memory_backend_mr_inited() where proper 2017-04-20 15:22:41 -03:00
block qcow2: Allow discard of final unaligned cluster 2017-04-28 16:02:03 +02:00
bsd-user bsd-user: align use of mmap_lock to that of linux-user 2017-03-28 10:50:40 +01:00
chardev -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +01:00
contrib contrib: add libvhost-user 2016-12-16 01:14:38 +02:00
crypto crypto: Make errp the last parameter of functions 2017-04-24 09:13:22 +02:00
default-configs s390x/3270: Mark non-migratable and enable the device 2017-05-04 10:34:37 +02:00
disas disas/cris.c: Avoid unintentional sign extension 2017-04-03 14:06:59 +01:00
docs trace: fix tcg tracing build breakage 2017-03-28 11:07:46 +01:00
dtc@558cd81bdd dtc: Revert unintentional submodule downgrade from commit c2cabb3422 2017-03-16 14:11:15 +00:00
fpu softfloat: Use correct type in float64_to_uint64_round_to_zero() 2017-02-28 09:03:38 +03:00
fsdev throttle: factor out duplicate code 2017-02-28 10:31:46 +01:00
gdb-xml target-ppc: gdbstub: Add VSX support 2016-01-30 23:37:38 +11:00
hw -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +01:00
include -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +01:00
io socket: Make errp the last parameter of socket_connect 2017-04-24 09:12:59 +02:00
libdecnumber libdecnumber: Clean up includes 2016-02-16 14:29:27 +00:00
linux-headers update Linux headers to 4.11 2017-02-28 16:18:49 +00:00
linux-user target/openrisc: implement shadow registers 2017-05-04 09:39:01 +09:00
migration migration/next for 20170504 2017-05-05 16:52:35 +01:00
nbd nbd-client: fix handling of hungup connections 2017-03-27 16:50:36 +02:00
net char: add a /chardevs container 2017-05-04 15:34:41 +04:00
pc-bios pc-bios/s390-ccw.img: update image 2017-05-02 15:08:54 +02:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: add missing translations in de, fr, it, zh 2016-12-14 18:47:19 +00:00
qapi block/vxhs.c: Add support for a new block device type called "vxhs" 2017-04-24 15:08:42 -04:00
qga qga: Add guest-get-timezone command 2017-04-27 00:40:25 -05:00
qobject qobject: Propagate parse errors through qobject_from_json() 2017-03-07 16:07:47 +01:00
qom container: don't leak container reference 2017-05-04 15:34:41 +04:00
replay monitor: Remove monitor parameter from save_vmstate 2017-05-04 10:32:58 +02:00
roms Update OpenBIOS images to 04898e8 built from submodule. 2017-04-22 07:27:20 +01:00
scripts trace: disallow more than 10 arguments per trace event 2017-05-08 09:38:30 -04:00
slirp slirp: VMStatify remaining except for loop 2017-04-29 18:44:16 +02:00
stubs move xen-hvm.c to hw/i386/xen/ 2017-04-25 11:04:34 -07:00
target Openrisc Features and Fixes for qemu 2.10 2017-05-05 16:21:16 +01:00
tcg tcg: Initialize return value after exit_atomic 2017-04-26 19:26:11 +02:00
tests -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +01:00
trace trace: fix tcg tracing build breakage 2017-03-28 11:07:46 +01:00
ui -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +01:00
util More s390x patches, this time boot related: 2017-05-05 16:00:03 +01:00
.dir-locals.el Add .dir-locals.el file to configure emacs coding style 2015-10-08 19:46:01 +03:00
.exrc
.gitignore qapi: Clean up build of generated documentation 2017-03-16 07:13:02 +01:00
.gitmodules ppc: add skiboot firmware for the pnv platform 2016-10-28 09:36:58 +11:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.shippable.yml .shippable: add s390x-cross target 2017-02-28 20:31:01 +08:00
.travis.yml .travis.yml: split VM based builds 2017-02-10 13:19:56 +00:00
accel.c clean-up: removed duplicate #includes 2016-10-28 18:17:24 +03:00
arch_init.c nios2: Add support for Nios-II R1 2017-01-24 13:10:36 -08:00
atomic_template.h tcg: Add atomic128 helpers 2016-10-26 08:29:01 -07:00
balloon.c trace: switch to modular code generation for sub-directories 2017-01-31 17:11:18 +00:00
block.c block: assert no image modification under BDRV_O_INACTIVE 2017-04-28 16:02:03 +02:00
blockdev-nbd.c nbd sockets vnc: Mark problematic address family tests TODO 2017-04-03 17:11:39 +02:00
blockdev.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
blockjob.c blockjob: Use bdrv_coroutine_enter to start coroutine 2017-04-11 20:07:15 +08:00
bootdevice.c error: Remove NULL checks on error_propagate() calls 2016-06-20 16:38:13 +02:00
bt-host.c all: Clean up includes 2016-02-04 17:41:30 +00:00
bt-vhci.c all: Clean up includes 2016-02-04 17:41:30 +00:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Mention preferred comment form 2017-02-28 09:03:38 +03:00
configure configure: fix trace backend list for out-of-tree builds 2017-04-28 16:49:41 +01:00
COPYING
COPYING.LIB
cpu-exec-common.c ui/console: ensure do_safe_dpy_refresh holds BQL 2017-03-28 10:52:24 +01:00
cpu-exec.c cpu-exec: update icount after each TB_EXIT 2017-04-10 10:23:38 +01:00
cpus-common.c *_run_on_cpu: introduce run_on_cpu_data type 2016-10-31 15:00:25 +01:00
cpus.c cpus: call cpu_update_icount on read 2017-04-10 10:23:38 +01:00
cputlb.c cputlb: Don't assume do_unassigned_access() never returns 2017-02-28 12:08:15 +00:00
device_tree.c qemu-common: stop including qemu/bswap.h from qemu-common.h 2016-05-19 16:42:28 +02:00
device-hotplug.c blockdev: Split monitor reference from BB creation 2016-03-17 15:47:56 +01:00
disas.c Fix Thumb-1 BE32 execution and disassembly. 2017-02-07 18:29:59 +00:00
dma-helpers.c block: explicitly acquire aiocontext in bottom halves that need it 2017-02-21 11:39:39 +00:00
dump.c error: Remove NULL checks on error_propagate() calls 2016-06-20 16:38:13 +02:00
exec.c memory: add support getting and using a dirty bitmap copy. 2017-04-24 10:12:28 +02:00
gdbstub.c char: add a /chardevs container 2017-05-04 15:34:41 +04:00
HACKING HACKING: document #include order 2017-01-03 16:38:47 +00:00
hax-stub.c Plumb the HAXM-based hardware acceleration support 2017-01-19 22:07:46 +01:00
hmp-commands-info.hx qmp/hmp: add query-vm-generation-id and 'info vm-generation-id' commands 2017-03-02 07:14:27 +02:00
hmp-commands.hx hmp: gpa2hva and gpa2hpa hostaddr command 2017-04-26 14:42:31 +01:00
hmp.c monitor: Move hmp_info_snapshots from savevm.c to hmp.c 2017-05-04 10:34:15 +02:00
hmp.h monitor: Move hmp_info_snapshots from savevm.c to hmp.c 2017-05-04 10:34:15 +02:00
ioport.c trace: switch to modular code generation for sub-directories 2017-01-31 17:11:18 +00:00
iothread.c monitor: add poll-* properties into query-iothreads result 2017-02-21 18:29:01 +00:00
kvm-all.c qemu-timer: do not include sysemu/cpus.h from util/qemu-timer.h 2017-03-14 13:28:18 +01:00
kvm-stub.c KVM: move SIG_IPI handling to kvm-all.c 2017-03-03 16:40:02 +01:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
MAINTAINERS Openrisc Features and Fixes for qemu 2.10 2017-05-05 16:21:16 +01:00
Makefile trace: Put all trace.o into libqemuutil.a 2017-04-21 10:45:35 +01:00
Makefile.objs target-mips: replace few LOG_DISAS() with trace points 2017-03-20 11:06:32 +00:00
Makefile.target Xen 2017/04/21 + fix 2017-04-26 10:22:31 +01:00
memory_ldst.inc.c exec: introduce memory_ldst.inc.c 2016-12-22 16:00:23 +01:00
memory_mapping.c memory: Replace skip_dump flag with "ram_device" 2016-10-31 09:53:03 -06:00
memory.c memory: add support getting and using a dirty bitmap copy. 2017-04-24 10:12:28 +02:00
module-common.c all: Clean up includes 2016-02-04 17:41:30 +00:00
monitor.c monitor: Move hmp_loadvm from monitor.c to hmp.c 2017-05-04 10:33:24 +02:00
numa.c numa,spapr: align default numa node memory size to 256MB 2017-03-22 11:32:42 +11:00
os-posix.c use g_path_get_dirname instead of dirname 2016-07-17 09:59:21 +02:00
os-win32.c all: Clean up includes 2016-02-04 17:41:30 +00:00
page_cache.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
qapi-schema.json chardev: Basic support for TN3270 2017-05-04 10:34:37 +02:00
qdev-monitor.c migration: Disable hotplug/unplug during migration 2017-04-21 12:25:40 +02:00
qdict-test-data.txt
qemu-bridge-helper.c all: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
qemu-doc.texi nios2 target support 2017-01-25 13:30:23 +00:00
qemu-ga.texi qemu-ga: Remove stray 'q' in documentation 2016-10-28 18:17:23 +03:00
qemu-img-cmds.hx qemu-img: Document backing options 2017-04-27 17:26:31 +02:00
qemu-img.c qemu-img: use blk_co_pwrite_zeroes for zero sectors when compressed 2017-04-28 18:18:23 +02:00
qemu-img.texi progress: Show current progress on SIGINFO 2017-04-28 18:48:11 +02:00
qemu-io-cmds.c block: Add errp to b{lk,drv}_truncate() 2017-04-28 16:02:02 +02:00
qemu-io.c qemu-io: Return non-zero exit code on failure 2017-02-12 00:47:42 +01:00
qemu-nbd.c qemu-ga: obey LISTEN_PID when using systemd socket activation 2017-03-19 11:12:12 +01:00
qemu-nbd.texi nbd: Add qemu-nbd -D for human-readable description 2016-11-02 09:28:55 +01:00
qemu-option-trace.texi docs: update manpage for stderr->log rename 2017-02-13 13:38:31 +00:00
qemu-options-wrapper.h hxtool: emit Texinfo headings as @subsection 2017-01-16 17:52:35 +01:00
qemu-options.h Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
qemu-options.hx Issue a deprecation warning if the user specifies the "-hdachs" option. 2017-04-27 15:40:40 +02:00
qemu-seccomp.c seccomp: adding getrusage to the whitelist 2016-09-21 11:26:02 +02:00
qemu-tech.texi qemu-doc: merge qemu-tech and qemu-doc 2016-10-07 10:05:54 +02:00
qemu.nsi qemu-doc: merge qemu-tech and qemu-doc 2016-10-07 10:05:54 +02:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qmp.c qdev: remove cannot_destroy_with_object_finalize_yet 2017-04-21 07:18:34 +02:00
qtest.c qtest: fix a memory leak 2017-03-01 00:09:28 +04:00
README README: Add linux to macOS build info 2017-01-24 23:26:52 +03:00
replication.c replication: Introduce new APIs to do replication operation 2016-09-13 11:00:56 +01:00
replication.h replication: Introduce new APIs to do replication operation 2016-09-13 11:00:56 +01:00
rules.mak qapi: Clean up build of generated documentation 2017-03-16 07:13:02 +01:00
softmmu_template.h cputlb: Tidy some macros 2016-10-26 08:29:00 -07:00
spice-qemu-char.c spice-char: fix segfault in char_spice_finalize 2017-03-03 16:40:03 +01:00
tcg-runtime.c tcg: Add opcode for ctpop 2017-01-10 08:48:56 -08:00
tci.c tcg/tci: Add support for fence 2016-09-16 08:12:12 -07:00
thunk.c thunk: Rename args and fields in host-target bitmask conversion code 2016-06-07 18:19:24 +03:00
tpm.c qapi: Don't special-case simple union wrappers 2016-03-18 10:29:26 +01:00
trace-events move xen-mapcache.c to hw/i386/xen/ 2017-04-25 11:04:34 -07:00
translate-all.c qemu-timer: do not include sysemu/cpus.h from util/qemu-timer.h 2017-03-14 13:28:18 +01:00
translate-all.h trace: Add per-vCPU tracing states for events with the 'vcpu' property 2016-07-18 18:23:12 +01:00
translate-common.c Merge branch 'icount-update' into HEAD 2017-03-03 16:39:18 +01:00
user-exec-stub.c stubs: group stubs for user-mode emulation 2017-01-16 17:52:35 +01:00
user-exec.c user-exec: handle synchronous signals from QEMU gracefully 2017-03-28 10:50:35 +01:00
VERSION Open 2.10 development tree 2017-04-20 15:42:31 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c -----BEGIN PGP SIGNATURE----- 2017-05-05 17:07:55 +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:

  mkdir build
  cd build
  ../configure
  make

Additional information can also be found online via the QEMU website:

  http://qemu-project.org/Hosts/Linux
  http://qemu-project.org/Hosts/Mac
  http://qemu-project.org/Hosts/W32


Submitting patches
==================

The QEMU source code is maintained under the GIT version control system.

   git clone git://git.qemu-project.org/qemu.git

When submitting patches, the preferred 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

  http://qemu-project.org/Contribute/SubmitAPatch
  http://qemu-project.org/Contribute/TrivialPatches


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:

  http://qemu-project.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
   http://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:

  http://qemu-project.org/Contribute/StartHere

-- End