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2011-07-27Makefile: add missing deps on $(GENERATED_HEADERS)Michael Roth1-1/+3
This fixes a build issue with make -j6+ due to qapi-generated files being built before $(GENERATED_HEADERS) have been created. Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-07-27Makefile: Minor cscope fixupsAlexandre Raymond1-1/+1
Create cscope symbols for assembly files in addition to .c/.h files. Create cscope database with full path instead of relative path so cscope can be used with CSCOPE_DB in any directory. Signed-off-by: Alexandre Raymond <cerbere@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-07-25Let users select their pythonsBlue Swirl1-6/+6
Add configure check for python, exit if not found. Add switches for specifying the path to python, use the path in Makefile. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-07-21guest agent: add guest agent RPCs/commandsMichael Roth1-3/+13
This adds the initial set of QMP/QAPI commands provided by the guest agent: guest-sync guest-ping guest-info guest-shutdown guest-file-open guest-file-read guest-file-write guest-file-seek guest-file-flush guest-file-close guest-fsfreeze-freeze guest-fsfreeze-thaw guest-fsfreeze-status The input/output specification for these commands are documented in the schema. Example usage: host: qemu -device virtio-serial \ -chardev socket,path=/tmp/vs0.sock,server,nowait,id=qga0 \ -device virtserialport,chardev=qga0,name=org.qemu.quest_agent.0 ... echo "{'execute':'guest-info'}" | socat stdio unix-connect:/tmp/qga0.sock guest: qemu-ga -m virtio-serial -p /dev/virtio-ports/org.qemu.guest_agent.0 \ -p /var/run/qemu-guest-agent.pid -d Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-21guest agent: qemu-ga daemonMichael Roth1-3/+5
This is the actual guest daemon, it listens for requests over a virtio-serial/isa-serial/unix socket channel and routes them through to dispatch routines, and writes the results back to the channel in a manner similar to QMP. A shorthand invocation: qemu-ga -d Is equivalent to: qemu-ga -m virtio-serial -p /dev/virtio-ports/org.qemu.guest_agent.0 \ -f /var/run/qemu-ga.pid -d Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-21guest agent: command state classMichael Roth1-1/+3
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-21qapi: add test-qmp-commands, tests for gen. marshalling/dispatch codeMichael Roth1-1/+7
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-21qapi: add test-visitor, tests for gen. visitor codeMichael Roth1-2/+17
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-07-21Add hard build dependency on glibAnthony Liguori1-0/+2
GLib is an extremely common library that has a portable thread implementation along with tons of other goodies. GLib and GObject have a fantastic amount of infrastructure we can leverage in QEMU including an object oriented programming infrastructure. Short term, it has a very nice thread pool implementation that we could leverage in something like virtio-9p. It also has a test harness implementation that this series will use. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>
2011-06-14libcacard: add libcacard.la targetAlon Levy1-1/+19
No flag to configure is required. Instead, added a libcacard.la target that is not built by default, only when requested explicitly via: mkdir build cd build ../configure make libcacard.la make install-libcacard Uses libtool to do actual linking of object files and shared library, and installing. Tested only under linux, but supposed to work on other systems as well. If libtool isn't found you get a message complaining about that, only at build time (since it is not a default target I did not add a message at configure time). New build artifacts: .libs subdirectories (at <buildroot> and <buildroot>/libcacard) *.lo files (at same locations as the respective o files) Added %.lo : %.c rule that uses libtool. Updated clean rule to clean up those artifacts. Added specific rule to call dtrace with libtool wrapper (note that because of a current upstream dtrace bug fixed by systemtap b1568fd85 commit the -fPIC flag isn't actually passed on. still current dtrace+libtool produced object links fine). If libtool is missing any of the following targets will complain and exit 1: any subdir: *.lo root and libcacard: libcacard.la, libcacard-instsall Tested to link and load with all tracing backends.
2011-06-07json-parser: propagate error from parserAnthony Liguori1-2/+2
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-03PPC: install mpc8544ds.dtbAlexander Graf1-0/+1
We don't install mpc8544ds.dtb, which means that -M mpc8544ds doesn't work when installed. Fix it by installing the file. Signed-off-by: Alexander Graf <agraf@suse.de>
2011-05-08libcacard: add correct subdirectory dependenciesPaolo Bonzini1-0/+2
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Cc: qemu-trivial@nongnu.org Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-04-25Merge remote-tracking branch 'awilliam/ipxe' into stagingAnthony Liguori1-8/+8
2011-04-18PXE: Use consistent naming for PXE ROMsAlex Williamson1-8/+8
And add missing ROMs to tarbin build target. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2011-04-16Makefile: Clean up after "make pdf"Brad Hards1-1/+4
Signed-off-by: Brad Hards <bradh@frogmouth.net> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-04-01libcacard: initial commitRobert Relyea1-2/+4
libcacard emulates a Common Access Card (CAC) which is a standard for smartcards. It is used by the emulated ccid card introduced in a following patch. Docs are available in docs/libcacard.txt Signed-off-by: Alon Levy <alevy@redhat.com> --- changes from v24->v25: * Fix out of tree builds. * Fix build with linux-user targets. changes from v23->v24: (Jes Sorensen review 2) * Makefile.target: use obj-$(CONFIG_*) += * remove unrequired includes, include qemu-common before qemu-thread * required adding #define NO_NSPR_10_SUPPORT (harmless) changes from v22->v23: * configure fixes: (reported by Stefan Hajnoczi) * test a = b, not a == b (second isn't portable) * quote $source_path in case it contains spaces - this doesn't really help since there are many other places that need similar fixes, not introduced by this patch. changes from v21->v22: * fix configure to not link libcacard if nss not found (reported by Stefan Hajnoczi) * fix vscclient linkage with simpletrace backend (reported by Stefan Hajnoczi) * card_7816.c: add missing break in ERROR_DATA_NOT_FOUND (reported by William van de Velde) changes from v20->v21: (Jes Sorensen review) * use qemu infrastructure: qemu-thread, qemu-common (qemu_malloc and qemu_free), error_report * assert instead of ASSERT * cosmetic fixes * use strpbrk and isspace * add --disable-nss --enable-nss here, instead of in the final patch. * split vscclient, passthru and docs to following patches. changes from v19->v20: * checkpatch.pl changes from v15->v16: Build: * don't erase self with distclean * fix make clean after make distclean * Makefile: make vscclient link quiet Behavioral: * vcard_emul_nss: load coolkey in more situations * vscclient: * use hton,ntoh * send init on connect, only start vevent thread on response * read payload after header check, before type switch * remove Reconnect * update for vscard_common changes, empty Flush implementation Style/Whitespace: * fix wrong variable usage * remove unused variable * use only C style comments * add copyright header * fix tabulation Signed-off-by: Alon Levy <alevy@redhat.com> libcacard: fix out of tree builds
2011-04-01trace: move trace objects from Makefile to Makefile.objsAlon Levy1-32/+0
2011-04-01Add SLOF-based partition firmware for pSeries machine, allowing more boot ↵David Gibson1-1/+1
options Currently, the emulated pSeries machine requires the use of the -kernel parameter in order to explicitly load a guest kernel. This means booting from the virtual disk, cdrom or network is not possible. This patch addresses this limitation by inserting a within-partition firmware image (derived from the "SLOF" free Open Firmware project). If -kernel is not specified, qemu will now load the SLOF image, which has access to the qemu boot device list through the device tree, and can boot from any of the usual virtual devices. In order to support the new firmware, an extension to the emulated machine/hypervisor is necessary. Unlike Linux, which expects multi-CPU entry to be handled kexec() style, the SLOF firmware expects only one CPU to be active at entry, and to use a hypervisor RTAS method to enable the other CPUs one by one. This patch also implements this 'start-cpu' method, so that SLOF can start the secondary CPUs and marshal them into the kexec() holding pattern ready for entry into the guest OS. Linux should, and in the future might directly use the start-cpu method to enable initially disabled CPUs, but for now it does require kexec() entry. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-04-01Implement hcall based RTAS for pSeries machinesDavid Gibson1-1/+2
On pSeries machines, operating systems can instantiate "RTAS" (Run-Time Abstraction Services), a runtime component of the firmware which implements a number of low-level, infrequently used operations. On logical partitions under a hypervisor, many of the RTAS functions require hypervisor privilege. For simplicity, therefore, hypervisor systems typically implement the in-partition RTAS as just a tiny wrapper around a hypercall which actually implements the various RTAS functions. This patch implements such a hypercall based RTAS for our emulated pSeries machine. A tiny in-partition "firmware" calls a new hypercall, which looks up available RTAS services in a table. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-03-16microblaze: Add PetaLogix ml605 MMU little-endian ref designMichal Simek1-1/+1
Add the first Microblaze little endian platform. Platform uses uart16550, axi ethernet, timer, intc. Signed-off-by: Michal Simek <monstr@monstr.eu> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
2011-01-20Add scripts directoryBlue Swirl1-13/+13
Move build and user scripts into scripts directory. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-12-09spice: add qxl vgabios binary.Gerd Hoffmann1-1/+1
Just compiled from vgabios git repo @ git.qemu.org, copyed over and committed. Also added to the list of blobs in the Makefile. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2010-12-01Merge remote branch 'origin/master' into pciMichael S. Tsirkin1-14/+41
Conflicts: Makefile.objs hw/virtio.c
2010-11-26Include directives in default configsPaul Brook1-5/+6
Allow default configs to be split into several files. Signed-off-by: Paul Brook <paul@codesourcery.com>
2010-11-26Add missing dependency.Paul Brook1-1/+1
Teach Makefile that cmd.o depends on a generated header (specifically config-host.h). Signed-off-by: Paul Brook <paul@codesourcery.com>
2010-11-22eepro100: Use a single rom file for all i825xx devicesStefan Weil1-1/+0
Patching the rom data during load (in qemu) now also supports i82801 (which had no rom file). We only need a single rom file for the whole device family, so remove the second one which is no longer needed. Cc: Markus Armbruster <armbru@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-11-21Makefile: Fix check dependency breakageLuiz Capitulino1-6/+8
Commit b152aa84d52882bb1846485a89baf13aa07c86bc broke the unit-tests build, fix it. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-11-21Add a DTrace tracing backend targetted for SystemTAP compatabilityDaniel P. Berrange1-0/+23
This introduces a new tracing backend that targets the SystemTAP implementation of DTrace userspace tracing. The core functionality should be applicable and standard across any DTrace implementation on Solaris, OS-X, *BSD, but the Makefile rules will likely need some small additional changes to cope with OS specific build requirements. This backend builds a little differently from the other tracing backends. Specifically there is no 'trace.c' file, because the 'dtrace' command line tool generates a '.o' file directly from the dtrace probe definition file. The probe definition is usually named with a '.d' extension but QEMU uses '.d' files for its external makefile dependancy tracking, so this uses '.dtrace' as the extension for the probe definition file. The 'tracetool' program gains the ability to generate a trace.h file for DTrace, and also to generate the trace.d file containing the dtrace probe definition. Example usage of a dtrace probe in systemtap looks like: probe process("qemu").mark("qemu_malloc") { printf("Malloc %d %p\n", $arg1, $arg2); } * .gitignore: Ignore trace-dtrace.* * Makefile: Extra rules for generating DTrace files * Makefile.obj: Don't build trace.o for DTrace, use trace-dtrace.o generated by 'dtrace' instead * tracetool: Support for generating DTrace data files Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-11-21Revert "Add a DTrace tracing backend targetted for SystemTAP compatability"Anthony Liguori1-23/+0
This reverts commit 4addb1127f6327c7ebcbd150a6b589e7677adc92.
2010-11-16Add a DTrace tracing backend targetted for SystemTAP compatabilityDaniel P. Berrange1-0/+23
This introduces a new tracing backend that targets the SystemTAP implementation of DTrace userspace tracing. The core functionality should be applicable and standard across any DTrace implementation on Solaris, OS-X, *BSD, but the Makefile rules will likely need some small additional changes to cope with OS specific build requirements. This backend builds a little differently from the other tracing backends. Specifically there is no 'trace.c' file, because the 'dtrace' command line tool generates a '.o' file directly from the dtrace probe definition file. The probe definition is usually named with a '.d' extension but QEMU uses '.d' files for its external makefile dependancy tracking, so this uses '.dtrace' as the extension for the probe definition file. The 'tracetool' program gains the ability to generate a trace.h file for DTrace, and also to generate the trace.d file containing the dtrace probe definition. Example usage of a dtrace probe in systemtap looks like: probe process("qemu").mark("qemu_malloc") { printf("Malloc %d %p\n", $arg1, $arg2); } * .gitignore: Ignore trace-dtrace.* * Makefile: Extra rules for generating DTrace files * Makefile.obj: Don't build trace.o for DTrace, use trace-dtrace.o generated by 'dtrace' instead * tracetool: Support for generating DTrace data files Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-11-16Add new vgabios binaries to blobs list.Gerd Hoffmann1-2/+3
aliguori: update VGA BIOS Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-11-01Fix out of tree buildBlue Swirl1-1/+1
df2943ba3c73ca21dbda063f15fa3e80064af864 broke out of tree build. Fix breakage by adding $(SRC_PATH). Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-11-01Merge remote branch 'mst/for_anthony' into stagingAnthony Liguori1-2/+5
2010-10-30Move QEMU OS dependant library functions to OS specific filesJes Sorensen1-3/+3
This moves library functions used by both QEMU and the QEMU tools, such as qemu-img, qemu-nbd etc. from osdep.c to oslib-{posix,win32}.c In addition it introduces oslib-obj.y to the Makefile set to be included by the various targets, instead of relying on these library functions magically getting included via block-obj-y. Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-27qemu-options.def: add to generated header listMichael S. Tsirkin1-2/+5
All files include qemu-options.h which pulls in qemu-options.def from the root directory. Thus generating qemu-options.def from Makefile.objs under the target directory is not effective. Further, people expect .def file to get cleaned with make clean: it does not have state so no reason to defer removing it until distclean. Also add a rule to remove old files that might be around. This fixes the error: ‘QEMU_OPTION_spice’ undeclared (first use in this function) error that some people reported which is really down to an out of date .def file. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-10-26Merge remote branch 'qmp/for-anthony' into stagingAnthony Liguori1-6/+6
2010-10-23qemu-timer: move commonly used timer code to qemu-timer-commonBlue Swirl1-3/+3
Move timer init functions to a new file, qemu-timer-common.c. Make other critical timer functions inlined to preserve performance in qemu-timer.c, also move muldiv64() (used by the inline functions) to qemu-timer.h. Adjust block/raw-posix.c and simpletrace.c to use get_clock() directly. Remove a similar/duplicate definition in qemu-tool.c. Adjust hw/omap_clk.c to include qemu-timer.h because muldiv64() is used there. After this change, tracing can be used also for user code and simpletrace on Win32. Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-22Fix test suite build with tracing enabledJan Kiszka1-6/+6
qemu_malloc instrumentations require linking against the trace objects. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-10-13ppc: remove video.xBlue Swirl1-2/+1
Only Mac-on-Linux stuff used video.x, OpenBIOS does not need it. Remove video.x MoL hacks. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-09trace: remove timestamp files when cleaning upBlue Swirl1-1/+1
'make clean' did not remove trace.[ch]-timestamp files, only trace.[ch]. But 'make' did not know how to make trace.[ch] files if the timestamp files were present. Fix by removing the timestamp files along with trace.[ch]. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-05Merge remote branch 'qmp/for-anthony' into stagingAnthony Liguori1-2/+2
2010-10-02trace: avoid unnecessary recompilation if nothing changedBlue Swirl1-5/+9
Add logic to detect changes in generated files. If the old and new files are identical, don't touch the generated file. This avoids a lot of churn since many files depend on trace.h. Based on suggestion by Paolo Bonzini. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-02Makefile: fix config-devices.mak generationBlue Swirl1-3/+5
The logic of detecting changes in default-configs/*.mak is flawed as can be demonstrated by 'touch default-configs/*.mak' followed by make. This results in a message claiming that user made changes to the */config-devices.mak files. Fix by separating the detection of changes made by the user and changes in the default-configs. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-10-01Monitor: Rename the qemu-monitor.hx fileLuiz Capitulino1-1/+1
Let's be consistent and call it hmp-commands.hx, so that we have qmp-commands.hx for QMP and hmp-commands.hx for HMP. Please, note that this commit doesn't touch qemu-monitor.texi. All texi files have the qemu- prefix and I don't think it's worth changing that. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-10-01Monitor: Introduce the qmp-commands.hx fileLuiz Capitulino1-1/+1
This file contains a copy of the following information from the qemu-monitor.hx file: o QObject handlers entries o QMP documentation (all SQMP/EQMP sections) Right now it's only used to generate the QMP docs in QMP/, but next commits will turn this into QMP's command dispatch table. It's important to note that QObject handlers entries are going to get duplicated: they will exist in both QMP's and HMP's dispatch tables. This will be fixed in the near future, when we add a proper QMP call interface and HMP is converted to use it. This way we can completely drop QObject handlers entries from HMP's tables. NOTE: HMP specific constructions, like "q|quit", have been dropped. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-09-26mingw: add version information to the executablesBlue Swirl1-3/+7
Add QEMU version information to the executables, based on earlier work by C. W. Betts and Robert Riebisch. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-09-21trace: Fix user emulator dependency on trace objectsAndreas Färber1-2/+2
On a clean build, after generating trace.h, make would recurse into *-*-user without a clue how to build ../trace.o (added to $(obj-y) in Makefile.target) since its generation rule is in the main Makefile. The softmmus are seemingly unaffected because the $(TOOLS), which each have a dependency on $(trace-obj-y), are built first for the build-all target. Add a dependency on $(trace-obj-y) for %-user, as done for the qemu-* tools. Let's be paranoid and do the same for %-softmmu while at it, just in case someone messes with $(TOOLS) or calls the Makefile target directly. Signed-off-by: Andreas Färber <andreas.faerber@web.de> Acked-by: Stefan Weil <weil@mail.berlios.de> Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Cc: Prerna Saxena <prerna@linux.vnet.ibm.com> Cc: Blue Swirl <blauwirbel@gmail.com> Cc: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-09-09trace: Add simple built-in tracing backendStefan Hajnoczi1-0/+2
This patch adds a simple tracer which produces binary trace files. To try out the simple backend: $ ./configure --trace-backend=simple $ make After running QEMU you can pretty-print the trace: $ ./simpletrace.py trace-events trace.log The output of simpletrace.py looks like this: qemu_realloc 0.699 ptr=0x24363f0 size=0x3 newptr=0x24363f0 qemu_free 0.768 ptr=0x24363f0 ^ ^---- timestamp delta (us) |____ trace event name Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Make trace record fields 64-bit Explicitly use 64-bit fields in trace records so that timestamps and magic numbers work for 32-bit host builds. Includes fixes from Prerna Saxena <prerna@linux.vnet.ibm.com>. Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2010-09-09trace: Add trace-events file for declaring trace eventsStefan Hajnoczi1-4/+13
This patch introduces the trace-events file where trace events can be declared like so: qemu_malloc(size_t size) "size %zu" qemu_free(void *ptr) "ptr %p" These trace event declarations are processed by a new tool called tracetool to generate code for the trace events. Trace event declarations are independent of the backend tracing system (LTTng User Space Tracing, ftrace markers, DTrace). The default "nop" backend generates empty trace event functions. Therefore trace events are disabled by default. The trace-events file serves two purposes: 1. Adding trace events is easy. It is not necessary to understand the details of a backend tracing system. The trace-events file is a single location where trace events can be declared without code duplication. 2. QEMU is not tightly coupled to one particular backend tracing system. In order to support tracing across QEMU host platforms and to anticipate new backend tracing systems that are currently maturing, it is important to be flexible and not tied to one system. This commit includes fixes from Prerna Saxena <prerna@linux.vnet.ibm.com> and Blue Swirl <blauwirbel@gmail.com>. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>