Chunyan Liu [Wed, 5 Mar 2014 11:12:04 +0000 (19:12 +0800)]
qemu_hostdev: move ColdBoot as a flag
For extracting hostdev codes from qemu_hostdev.c to common library, change qemu
specific COLD_BOOT handling to be a flag, and pass it to hostdev functions.
Chunyan Liu [Wed, 5 Mar 2014 10:56:26 +0000 (18:56 +0800)]
qemu_hostdev: move cfg->relaxedACS as a flag
For extracting hostdev codes from qemu_hostdev.c to common library, change qemu
specific cfg->relaxedACS handling to be a flag, and pass it to hostdev
functions.
Chunyan Liu [Wed, 5 Mar 2014 06:33:30 +0000 (14:33 +0800)]
qemu: reuse hostdev interfaces to avoid duplicate
Same logic of preparing/reattaching hostdevs could be used in attach/detach
hotplug places, so reuse hostdev interfaces to avoid duplicate, also for later
extracting general code to common library.
Chunyan Liu [Wed, 5 Mar 2014 06:20:50 +0000 (14:20 +0800)]
update qemuPrepareHostUSBDevices parameters to keep consistency
Update parameters from vm->def to specific name, hostdevs, nhostdevs to keep
consistentcy with PreparePCIDevices and PrepareSCSIDevices. And, at the same
time, make it reusable in later patch.
Chunyan Liu [Thu, 6 Mar 2014 04:14:21 +0000 (12:14 +0800)]
virhostdev: use virObject to virHostdevManager to keep reference
Use virObject to virHostdevManager, so that each driver using virHostdevManager
can keep a reference to it, and through counting refs to make virHostdevManager
get freed.
Jiri Denemark [Mon, 10 Mar 2014 15:00:49 +0000 (16:00 +0100)]
Load CPU map from builddir when run uninstalled
When libvirtd is run from a build directory without being installed, it
should not depend on files from a libvirt package installed in the
system. Not only because there may not be any libvirt installed at all.
We already do a good job for plugins but cpu_map.xml was still loaded
from the system.
The Makefile.am change is necessary to make this all work from VPATH
builds since libvirtd has no idea where to find libvirt sources. It only
knows the path from which it was started, i.e, a builddir.
Fix sec label setup when attaching to QEMU processes
When attaching to a QEMU process, the def->seclabels array is
going to be empty. The qemuProcessAttach method must thus
populate it with data for the security drivers.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Eric Blake [Thu, 6 Mar 2014 23:33:16 +0000 (16:33 -0700)]
qemu: don't munge user input during block commit
While investigating https://bugzilla.redhat.com/show_bug.cgi?id=1061827
I noticed that we pass user input unscathed for block-pull, but
always pass a canonical absolute name through for block-commit.
[Note that we probably _ought_ to validate that the user's request
for block-pull actually matches the backing chain, the way we already
do for block-commit - but that's a separate issue. Further note that
the ability to pass user input through unscathed allows backdoors
such as specifying a backing image that is a network URI such as
a gluster disk, instead of forcing things to the local file system;
which is an area still under active investigation on whether libvirt
needs to behave differently for network disks.]
Since qemu may write the name that the user passed in as the backing
file, a user may have a reason to want a relative file name passed
through to qemu, and always munging things to absolute prevents that.
Put another way, if you have the backing chain:
[A] <- [B(back=./A)] <- [C(back=./B)]
and commit B into A (virsh blockcommit $dom vda --base A --top B),
the metadata of C will have to be re-written. But should it be
rewritten as [C(back=./A)] or as [C(back=/path/to/A)]? Still up in
the air is whether qemu's decision should be based on whether B
and/or C had relative paths, or on whether the --base and/or
--top arguments to the command were relative paths; but if we always
pass a canonical name, we've prevented the spelling of the command
arguments from being part of the hueristics that qemu uses.
I also audited the code, and verified that we never call
qemuMonitorBlockCommit() with a NULL base, either before or after
the change to qemu_driver.c.
* src/qemu/qemu_driver.c (qemuDomainBlockCommit): Preserve user's
spelling, since absolute vs. relative matters to qemu.
* src/qemu/qemu_monitor.h (qemuMonitorBlockCommit): Base is never
null.
* src/qemu/qemu_monitor.c (qemuMonitorBlockCommit): Likewise.
* src/qemu/qemu_monitor_json.h (qemuMonitorJSONBlockCommit):
Likewise.
* src/qemu/qemu_monitor_json.c (qemuMonitorJSONBlockCommit):
Likewise.
Eric Blake [Mon, 10 Mar 2014 21:56:44 +0000 (15:56 -0600)]
iptables: don't log command probe failures
Commit b9dd878f caused a regression in iptables interaction by
logging non-zero status at a higher level than VIR_INFO. Revert
that portion of the commit, as well as adding a comment explaining
why we check the status ourselves.
Jim Fehlig [Fri, 7 Mar 2014 17:31:45 +0000 (10:31 -0700)]
libxl: support sexpr in native to XML conversion
Supporting sexpr in connectDomainXMLFromNative in the libxl driver
adds flexibility for users importing legacy Xen configuration into
libvirt. E.g. this patch allows importing previous xend-managed
domains from /var/lib/xend/domains/<dom-uuid>/config.sxp into the
libvirt libxl driver.
Found one core and one possible memory leak. Core seen during local
virt-test/tp_libvirt run for the vol_create_from test. The memory leak
was seen by inspection during a review of all VIR_APPEND_ELEMENT changes
In storage_backend_disk/virStorageBackendDiskMakeDataVol(), the 'vol'
needs to be kept around since it's used later, so use the _COPY macro.
This caused a segv in libvirtd:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffe87c3700 (LWP 6919)]
virStorageBackendDiskMakeDataVol (vol=0x0, groups=0x7fffc8000d70, pool=0x7fffc8002460) at storage/storage_backend_disk.c:66
66 if (vol->target.path == NULL) {
In storage_backend_rbd/virStorageBackendRBDRefreshPool() there's a failure
path where the 'vol' needs to go through virStorageVolDefFree() since it
wouldn't be appended.
Remove broken error reporting in QEMU mac filtering
The qemu_bridge_filter.c file had some helpers for calling
the ebtablesXXX functions todo bridge filtering. The only
thing these helpers did was to overwrite the original error
message from the ebtables code. For added fun, the callers
of these helpers overwrote the errors yet again. For even
more fun, one of the helpers called another helper and
overwrite its errors too.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The ebtRules data structure serves no useful purpose as
the table name is never used and only 1 single chain name
needs to be stored. Just store the chain name directly
in the ebtablesContext instead.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Remove data structure holding list of ebtables rules
When adding/removing ebtables rules, the code would keep
an array of all rules in memory. This list of rules was
never used for any purpose and would be lost if libvirtd
restarted. Delete all the unused code.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Remove many decls from bridge driver platform header
The bridge_driver_platform.h defines many functions that
a platform driver must implement. Only two of these
functions are actually called from the main bridge driver
code. The remainder can be made internal to the linux
driver only.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Extracting capabilities from QEMU takes a notable amount of time
when all QEMU binaries are installed. Each system emulator
needs about 200-300ms multiplied by 26 binaries == ~5-8 seconds.
This change causes the QEMU driver to save an XML file containing
the content of the virQEMUCaps object instance in the cache
dir eg /var/cache/libvirt/qemu/capabilities/$SHA256(binarypath).xml
or $HOME/.cache/libvirt/qemu/cache/capabilities/$SHA256(binarypath).xml
We attempt to load this and only if it fails, do we fallback to
probing the QEMU binary. The ctime of the QEMU binary and libvirtd
are stored in the cached file and its data discarded if either
of them change.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Change QEMU capabilities cache to check ctime instead of mtime
Debian's package manager will preserve mtime timestamp on binaries
from the time they are built, rather than installed. So if a
user downgrades their QEMU dpkg, the libvirt capabilities
cache will not refresh. The fix is to use ctime instead of mtime
since it cannot be faked.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Add helper APIs to track if libvirtd or loadable modules have changed
The future QEMU capabilities cache needs to be able to invalidate
itself if the libvirtd binary or any loadable modules are changed
on disk. Record the 'ctime' value for these binaries and provide
helper APIs to query it. This approach assumes that if libvirt.so
is changed, then libvirtd will also change, which should usually
be the case with libtool's wrapper scripts that cause libvirtd to
get re-linked
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Add helper APIs for generating cryptographic hashes
GNULIB provides APIs for calculating md5 and sha256 hashes,
but these APIs only return you raw byte arrays. Most users
in libvirt want the hash in printable string format. Add
some helper APIs in util/vircrypto.{c,h} for doing this.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
conf: Utilize more of VIR_(APPEND|INSERT|DELETE)_ELEMENT
This fixes a possible double free. In virNetworkAssignDef() if
virBitmapNew() fails, then virNetworkObjFree(network) is called.
However, with network->def pointing to actual @def. So if caller
frees @def again, ...
Moreover, this fixes one possible memory leak too. In
virInterfaceAssignDef() if appending to the list of interfaces
fails, we ought to call virInterfaceObjFree() instead of bare
VIR_FREE().
Although, in order to do that some array size variables needs
to be turned into size_t rather than int.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
The nwfilter conf update mutex previously serialized
updates to the internal data structures for firewall
rules, and updates to the firewall itself. The latter
was recently turned into a read/write lock, and filter
instantiation allowed to proceed in parallel. It was
believed that this was ok, since each filter is created
on a separate iptables/ebtables chain.
It turns out that there is a subtle lock ordering problem
on virNWFilterObjPtr instances. __virNWFilterInstantiateFilter
will hold a lock on the virNWFilterObjPtr it is instantiating.
This in turn invokes virNWFilterInstantiate which then invokes
virNWFilterDetermineMissingVarsRec which then invokes
virNWFilterObjFindByName. This iterates over every single
virNWFilterObjPtr in the list, locking them and checking their
name. So if 2 or more threads try to instantiate a filter in
parallel, they'll all hold 1 lock at the top level in the
__virNWFilterInstantiateFilter method which will cause the
other thread to deadlock in virNWFilterObjFindByName.
The fix is to add an exclusive mutex to serialize the
execution of __virNWFilterInstantiateFilter.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
vshRunConsole() uses virCondWait() which is a wrapper around
pthread_cond_wait(). On FreeBSD, pthread_cond_wait needs mutex to be
locked, otherwise it immediately fails with EPERM. On Linux, the
behaviour in this case is undefined.
John Ferlan [Fri, 7 Mar 2014 14:46:21 +0000 (09:46 -0500)]
virscsi: Introduce virSCSIDeviceUsedByInfoFree
This resolves a Coverity RESOURCE_LEAK issue introduced by commit
id 'de6fa535' where the virSCSIDeviceSetUsedBy() didn't VIR_FREE
the 'copy' or possibly VIR_STRDUP()'d values. It also ensures that
the VIR_APPEND_ELEMENT is successful...
Michael Chapman [Thu, 6 Mar 2014 06:02:47 +0000 (17:02 +1100)]
tests: SELinux tests do not need to be skipped
With the previous commit's securityselinuxhelper enhancements, the
SELinux security manager can be tested even without SELinux enabled on
the test system.
Signed-off-by: Michael Chapman <mike@very.puzzling.org>
The selabel_* functions back onto the real implementations if SELinux is
enabled on the test system, otherwise we just implement a fake selabel
handle which errors out on all labelling lookups.
With these changes in place, securityselinuxtest and
securityselinuxlabeltest don't need to skip all tests if SELinux isn't
available; they can exercise much of the security manager code.
Signed-off-by: Michael Chapman <mike@very.puzzling.org>
Jiri Denemark [Thu, 6 Mar 2014 10:52:25 +0000 (11:52 +0100)]
spec: Let translations be properly updated
Libvirt tarball contains po/stamp-po file which prevents any po/*.gmo
file to be regenerated even if a corresponding po/*.po file is newer. By
removing the stamp-po file, all *.gmo files are properly updated if
required. This allows downstreams to provide patches that update
translations.
When domain is started with setting that cannot be done, i.e. those
that require cgroups, there is no error reported and it succeeds
without any message whatsoever.
When setting with API, virsh, an error is reported, but only due to
the fact that no cgroups are mounted (priv->cgroup == NULL).
Given the above it seems reasonable to reject such unsupported
settings.
This patch effectively changes the error message from:
$ virsh -c qemu:///session schedinfo dummy
Scheduler : Unknown
error: Requested operation is not valid: cgroup CPU controller is not mounted
to:
$ virsh -c qemu:///session schedinfo dummy
Scheduler : Unknown
error: Operation not supported: CPU tuning is not available in session mode
Eric Blake [Wed, 5 Mar 2014 18:55:27 +0000 (11:55 -0700)]
virt-login-shell: silence coverity warning
Coverity spotted that 'nfdlist' (ssize_t) could be -1, but that we
were using 'i' (size_t) to iterate over the list at cleanup, with
crashing results because it promotes to a really big unsigned number.
* tools/virt-login-shell.c (main): Avoid treating -1 as unsigned.
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