There were couple of reports on the list (e.g. [1]) that guests
with huge amounts of RAM are unable to start because libvirt
kills qemu in the initialization phase. The problem is that if
guest is configured to use hugepages kernel has to zero them all
out before handing over to qemu process. For instance, 402GiB
worth of 1GiB pages took around 105 seconds (~3.8GiB/s). Since we
do not want to make the timeout for connecting to monitor
configurable, we have to teach libvirt to count with this
fact. This commit implements "1s per each 1GiB of RAM" approach
as suggested here [2].
1: https://www.redhat.com/archives/libvir-list/2017-March/msg00373.html
2: https://www.redhat.com/archives/libvir-list/2017-March/msg00405.html
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Similar to the existing qemuMonitorTestNewFromFile the *Full version
will allow to check both commands and supply responses for a better
monitor testing.
The current version uses the first JSON reply from the file as monitor
greeting. With the new parameter the caller can now request a simple
test monitor to be created, which uses an artificial greeting and uses
all JSON strings from the file as regular replies.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
It's a convenient wrapper around qemuMonitorTestNew which feeds the test
monitor with QMP replies from a specified file.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
qemu HMP commands sent by libvirt are terminated just by a '\r'. The
fake monitor used in tests wasn't prepared to handle this and the
communication would hang on an attempt to do a HMP conversation.
Add a special case for handling commands separated by \r in case HMP is
used.
The qemu JSON monitor test allows to test also expected command
arguments. As the error from the monitor simulator is returned as a
simulated qemu error (in JSON) all other JSON contained in the error
message needs to be escaped. This will happen if the monitor command
under test receives a JSON array as an argument.
This will improve the error message from:
libvirt: error : internal error: cannot parse json { "error": { "desc":
"Invalid value of argument 'keys' of command 'send-key': expected 'ble'
got '[{"type":"number","data":43},{"type":"number","data":26},
{"type":"number","data":46},{"type":"number","data":32}]'",
"class": "UnexpectedCommand" } }: lexical error: invalid string in json text.
To:
libvirt: QEMU Driver error : internal error: unable to execute QEMU
command 'send-key': Invalid value of argument 'keys' of command
'send-key': expected 'ble' got '[{"type":"number","data":43},
{"type":"number","data":26},{"type":"number","data":46},
{"type":"number","data":32}]'
This improvement will not have any effect on tests executing as
expected, but it will help test development.
Any source file which calls the logging APIs now needs
to have a VIR_LOG_INIT("source.name") declaration at
the start of the file. This provides a static variable
of the virLogSource type.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Most of the usage of getuid()/getgid() is in cases where we are
considering what privileges we have. As such the code should be
using the effective IDs, not real IDs.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Join the worker thread no matter if it is running or zombie already.
With current implementation the thread is joined iff @running is true.
However, when worker executes the last line, @running is set to false.
Hence qemuMonitorTestFree() won't join it (and free resources) even
though we can clearly see worker has run (nobody else sets @running =
false).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
In a few cases we might want to not care if monitor command executed on
the mocked monitor matches the one we have reply for. Sounds crazy, but
if we just want monitor to return certain values (e.g. read from a file)
there is no need to care about command match.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Currently, when creating a new mocked monitor, the greeting can't be
chosen. This is crucial for next patches, because some info as qemu
version is obtained in the greeting message.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
The virDomainChrSourceDef variable should be memset to
0, so that the cleanup block does not free uninitialized
data on OOM.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The qemuMonitorCommonTestInit method did not allocate the
test object, so it should not free it upon failure. Doing
so causes a double free with the caller.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Use the JSON error messages to report errors back to the caller in
addition to erroring out. The error reported from the event loop from
the mock function of the monitor was later overwritten by the call to
the monitor/agent interaction API. This will also allow testing of error
reporting.
The normal monitor uses windows line endings, where the agent monitor
uses only newlines. Change this to tolerate both approaches and allow to
use the utilities for guest agent tests.
Refactor the test helpers to allow adding callbacks to verify the
monitor responses instead of simple command name checking and clean up
various parts to prepare for adding guest agent tests.
The instrumentation for the monitor test can be hacked for qemu agent
testing. Split out the monitor specific stuff to allow using the code in
guest agent tests in the future.
The qemumonitorjsontest crashed when one of the initialization steps
done before starting the worker thread failed. This patch fixes this by
trying to pthread_join() the thread only after it was created.
The source code base needs to be adapted as well. Some files
include virutil.h just for the string related functions (here,
the include is substituted to match the new file), some include
virutil.h without any need (here, the include is removed), and
some require both.
http://www.uhv.edu/ac/newsletters/writing/grammartip2009.07.01.htm
(and several other sites) give hints that 'onto' is best used if
you can also add 'up' just before it and still make sense. In many
cases in the code base, we really want the two-word form, or even
a simplification to just 'on' or 'to'.
* docs/hacking.html.in: Use correct 'on to'.
* python/libvirt-override.c: Likewise.
* src/lxc/lxc_controller.c: Likewise.
* src/util/virpci.c: Likewise.
* daemon/THREADS.txt: Use simpler 'on'.
* docs/formatdomain.html.in: Better usage.
* docs/internals/rpc.html.in: Likewise.
* src/conf/domain_event.c: Likewise.
* src/rpc/virnetclient.c: Likewise.
* tests/qemumonitortestutils.c: Likewise.
* HACKING: Regenerate.
Signed-off-by: Eric Blake <eblake@redhat.com>
This patch is the result of running:
for i in $(git ls-files | grep -v html | grep -v \.po$ ); do
sed -i -e "s/virDomainXMLConf/virDomainXMLOption/g" -e "s/xmlconf/xmlopt/g" $i
done
and a few manual tweaks.
The virCaps structure gathered a ton of irrelevant data over time that.
The original reason is that it was propagated to the XML parser
functions.
This patch aims to create a new data structure virDomainXMLConf that
will contain immutable data that are used by the XML parser. This will
allow two things we need:
1) Get rid of the stuff from virCaps
2) Allow us to add callbacks to check and add driver specific stuff
after domain XML is parsed.
This first attempt removes pointers to private data allocation functions
to this new structure and update all callers and function that require
them.
On a machine without yajl headers, I was seeing random segfaults
from qemumonitorjsontest (about 90% of the runs on my particular
machine). The segfault was inside virClassIsDerivedFrom, which
points to a case of a race leading to unreferencing a stale
pointer to an object that had already been freed. I also noticed
that if I got the segfault, I was seeing messages such as:
2013-02-22 16:12:37.504+0000: 19833: error : virNetSocketWriteWire:1361 : Cannot write data: Bad file descriptor
which is also evidence of deferencing a stale pointer. I traced it
to a race where qemuMonitorTestIO could execute late, after the
main thread had already called qemuMonitorTestFree and called
virNetSocketClose(test->client) but not clearing it out to NULL.
Sure enough, after test->client has been closed, fd is -1, which
causes an attempt to write to the socket to fail, which in turn
triggers the error code of qemuMonitorTestIO that tries to re-close
test->client.
* tests/qemumonitortestutils.c (qemuMonitorTestIO): Don't attempt
to free client again if test already quit.
When Valgrind runs the 'qemumonitorjsontest' it would claim that the
thread created is leaked. That's because the virThreadJoin won't get
called due to the 'running' flag being cleared. In order to avoid that,
call virThreadJoin unconditionally at cleanup time. Also noted that the
qemuMonitorTestWorker() didn't get the test mutex lock on the failure path.
The incoming and outgoing buffers allocated by qemuMonitorTestIO() and
qemuMonitorTestAddReponse() were never VIR_FREE()'d in qemuMonitorTestFree().
While testing QMP, I used a simple qemu session of
'qemu-kvm -M none -nodefaults -nographic -qmp stdio'
for some experiments. But it took me far too long to remember
the magic invocation to unlock QMP into accepting normal commands.
While I was able to grep libvirt sources and easily find where
libvirt expects the normal "QMP" greeting, I could not find the
proper reply to that greeting nearby.
Reading the testsuite didn't help either, since there we don't
emulate the mandatory handshake. But since my grep hit the
testsuite, adding a bit of documentation will make it much easier
to jog my memory in the future.
* tests/qemumonitortestutils.c (QEMU_JSON_GREETING): Mention that
the normal counterpart reply is skipped.
In the error path, the test buffer is free'd, but due to how the free
routine is written the 'test' buffer pointer does not return to the caller
as NULL and then the free'd buffer address is returned to the caller.
The virDomainObj, qemuAgent, qemuMonitor, lxcMonitor classes
all require a mutex, so can be switched to use virObjectLockable
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
