Jiri Denemark [Fri, 25 Nov 2016 10:11:37 +0000 (11:11 +0100)]
Consolidate documentation of virDomainMigrate{,ToURI}{,2,3}
Only the latest APIs are fully documented and the documentation of the
older variants (which are just limited versions of the new APIs anyway)
points to the newest APIs.
When trying to install libvirtd from sources I've noticed the
following failure:
/usr/bin/install: cannot stat 'virt-guest-shutdown.target': No such file or directory
Makefile:2792: recipe for target 'install-init-systemd' failed
make[3]: *** [install-init-systemd] Error 1
make[3]: *** Waiting for unfinished jobs....
The problem is that while other files around that location in
Makefile are firstly generated into the builddir and only after
that installed, virt-guest-shutdown.target file is not generated
at all and should be installed from the srcdir.
Jiri Denemark [Wed, 23 Nov 2016 13:07:53 +0000 (14:07 +0100)]
qemuProcessReconnect: Avoid relabeling images after migration
Restarting libvirtd on the source host at the end of migration when a
domain is already running on the destination would cause image labels to
be reset effectively killing the domain. Commit e8d0166e1d fixed similar
issue on the destination host, but kept the source always resetting the
labels, which was mostly correct except for the specific case handled by
this patch.
Jiri Denemark [Tue, 22 Nov 2016 19:23:56 +0000 (20:23 +0100)]
qemu: Report tunnelled post-copy migration as unsupported
Post-copy migration needs bi-directional communication between the
source and the destination QEMU processes, which is not supported by
tunnelled migration.
Peter Krempa [Fri, 25 Nov 2016 16:08:25 +0000 (17:08 +0100)]
qemu: capabilities: Don't partially reprope caps on process reconnect
Thanks to the complex capability caching code virQEMUCapsProbeQMP was
never called when we were starting a new qemu VM. On the other hand,
when we are reconnecting to the qemu process we reload the capability
list from the status XML file. This means that the flag preventing the
function being called was not set and thus we partially reprobed some of
the capabilities.
The recent addition of CPU hotplug clears the
QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS if the machine does not support it.
The partial re-probe on reconnect results into attempting to call the
unsupported command and then killing the VM.
Remove the partial reprobe and depend on the stored capabilities. If it
will be necessary to reprobe the capabilities in the future, we should
do a full reprobe rather than this partial one.
QEMU 2.8.0 adds support for unavailable-features in
query-cpu-definitions reply. The unavailable-features array lists CPU
features which prevent a corresponding CPU model from being usable on
current host. It can only be used when all the unavailable features are
disabled. Empty array means the CPU model can be used without
modifications.
We can use unavailable-features for providing CPU model usability info
in domain capabilities XML:
Jiri Denemark [Sun, 20 Nov 2016 22:21:19 +0000 (23:21 +0100)]
qemu: Avoid reporting "host" as a supported CPU model
"host" CPU model is supported by a special host-passthrough CPU mode and
users is not allowed to specify this model directly with custom mode.
Thus we should not advertise "host" CPU model in domain capabilities.
This worked well on architectures for which libvirt provides a list of
supported CPU models in cpu_map.xml (since "host" is not in the list).
But we need to explicitly filter "host" model out for all other
architectures.
Jiri Denemark [Mon, 14 Nov 2016 16:21:30 +0000 (17:21 +0100)]
qemu: Probe CPU models for KVM and TCG
CPU models (and especially some additional details which we will start
probing for later) differ depending on the accelerator. Thus we need to
call query-cpu-definitions in both KVM and TCG mode to get all data we
want.
Tests in tests/domaincapstest.c are temporarily switched to TCG to avoid
having to squash even more stuff into this single patch. They will all
be switched back later in separate commits.
Jiri Denemark [Wed, 16 Nov 2016 13:17:12 +0000 (14:17 +0100)]
qemu: Refresh caps in virQEMUCapsCacheLookupByArch
The function just returned cached capabilities without checking whether
they are still valid. We should check that and refresh the capabilities
to make sure we don't return stale data. In other words, we should do
what all other lookup functions do.
Jiri Denemark [Wed, 16 Nov 2016 12:47:09 +0000 (13:47 +0100)]
qemu: Refactor virQEMUCapsCacheLookup
The function is made a little bit more readable and the code which
refreshes cached capabilities if they are not valid any more was moved
into a separate function (virQEMUCapsCacheValidate) so that it can be
reused in other places.
Jiri Denemark [Fri, 25 Nov 2016 19:03:12 +0000 (20:03 +0100)]
qemu: Don't return unusable virttype in domain capabilities
If a user asked for a KVM domain capabilities when KVM is not available,
we would happily return data we got when probing through TCG and
pretended they were relevant for KVM. Let's just report KVM is not
supported to avoid confusion.
Jiri Denemark [Tue, 15 Nov 2016 19:02:56 +0000 (20:02 +0100)]
qemu: Use saner defaults for domain capabilities
When domain capabilities were introduced we did not have enough data to
decide whether KVM works on the host or not and thus working legacy/VFIO
device assignment was used as a witness. Now that we know whether KVM
was enabled when probing QEMU capabilities (and thus we know it's
working), we can use this knowledge to provide better default value for
virttype.
Jiri Denemark [Wed, 15 Jun 2016 15:21:08 +0000 (17:21 +0200)]
qemu: Discard caps cache when KVM availability changes
Since some may depend on the accelerator used when probing QEMU the
cache becomes invalid when KVM becomes available or if it is not
available anymore.
Jiri Denemark [Fri, 10 Jun 2016 15:16:21 +0000 (17:16 +0200)]
qemu: Enable KVM when probing capabilities
CPU related capabilities may differ depending on accelerator used when
probing. Let's use KVM if available when probing QEMU and fall back to
TCG. The created capabilities already contain all we need to distinguish
whether KVM or TCG was used:
- KVM was used when probing capabilities:
QEMU_CAPS_KVM is set
QEMU_CAPS_ENABLE_KVM is not set
- TCG was used and QEMU supports KVM, but it failed (e.g., missing
kernel module or wrong /dev/kvm permissions)
QEMU_CAPS_KVM is not set
QEMU_CAPS_ENABLE_KVM is set
- KVM was not used and QEMU does not support it
QEMU_CAPS_KVM is not set
QEMU_CAPS_ENABLE_KVM is not set
Jiri Denemark [Mon, 14 Nov 2016 13:29:57 +0000 (14:29 +0100)]
qemucapsprobe: Ignore all greetings except the first one
When starting QEMU more than once during a single probing process,
qemucapsprobe utility would save QMP greeting several times, which
doesn't play well with our test monitor.
Jiri Denemark [Fri, 10 Jun 2016 17:14:52 +0000 (19:14 +0200)]
qemu: Probe KVM state earlier
Let's set QEMU_CAPS_KVM and QEMU_CAPS_ENABLE_KVM early so that the rest
of the probing code can use these capabilities to handle KVM/TCG replies
differently.
The code that runs a new QEMU process to be used for probing
capabilities is separated into four reusable functions so that any code
that wants to probe a QEMU process may just follow a few simple steps:
Boris Fiuczynski [Thu, 24 Nov 2016 12:28:00 +0000 (13:28 +0100)]
qemu: fix internal error: NUMA isn't available on this host
If libvirt is compiled without NUMACTL support starting libvirtd
reports a libvirt internal error "NUMA isn't available on this host"
without checking if NUMA support is compiled into the libvirt binaries.
This patch adds the missing NUMA support check to prevent the internal error.
It also includes a check if the cgroup controller cpuset is available before
using it.
The error was noticed when libvirtd was restarted with running domains and
on libvirtd start the qemuConnectCgroup gets called during qemuProcessReconnect.
Signed-off-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com> Reviewed-by: Bjoern Walk <bwalk@linux.vnet.ibm.com>
Add basic vhost-scsi tests which were cloned from hostdev-scsi-virtio-scsi
in both xml2argv and xml2xml. Added ones for both vhost-scsi-ccw and
vhost-scsi-pci since the syntaxes are slightly different between them.
Also adjusted the docs to describe the changes.
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Eric Farman [Tue, 22 Nov 2016 03:58:19 +0000 (22:58 -0500)]
qemu: Allow hotplug of vhost-scsi device
Adjust the device string that is built for vhost-scsi devices so that it
can be invoked from hotplug.
From the QEMU command line, the file descriptors are expect to be numeric only.
However, for hotplug, the file descriptors are expected to begin with at least
one alphabetic character else this error occurs:
# virsh attach-device guest_0001 ~/vhost.xml
error: Failed to attach device from /root/vhost.xml
error: internal error: unable to execute QEMU command 'getfd':
Parameter 'fdname' expects a name not starting with a digit
We also close the file descriptor in this case, so that shutting down the
guest cleans up the host cgroup entries and allows future guests to use
vhost-scsi devices. (Otherwise the guest will silently end.)
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Eric Farman [Tue, 22 Nov 2016 03:58:18 +0000 (22:58 -0500)]
qemu: Add vhost-scsi string for -device parameter
Open /dev/vhost-scsi, and record the resulting file descriptor, so that
the guest has access to the host device outside of the libvirt daemon.
Pass this information, along with data parsed from the XML file, to build
a device string for the qemu command line. That device string will be
for either a vhost-scsi-ccw device in the case of an s390 machine, or
vhost-scsi-pci for any others.
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Eric Farman [Tue, 22 Nov 2016 03:58:17 +0000 (22:58 -0500)]
util: Management routines for scsi_host devices
For a new hostdev type='scsi_host' we have a number of
required functions for managing, adding, and removing the
host device to/from guests. Provide the basic infrastructure
for these tasks.
The name "SCSIVHost" (and its variants) is chosen to avoid
conflicts with existing code named "SCSIHost" to refer to
a hostdev type='scsi' protcol='none'.
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Eric Farman [Tue, 22 Nov 2016 03:58:16 +0000 (22:58 -0500)]
Introduce framework for a hostdev SCSI_host subsystem type
We already have a "scsi" hostdev subsys type, which refers to a single
LUN that is passed through to a guest. But what of things where
multiple LUNs are passed through via a single SCSI HBA, such as with
the vhost-scsi target? Create a new hostdev subsys type that will
carry this.
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Dawid Zamirski [Wed, 23 Nov 2016 19:01:10 +0000 (14:01 -0500)]
vbox: change how vbox API is initialized.
* add vboxDriver object to serve as a singleton global object that
holds references to IVirtualBox and ISession to be shared among
multiple connections. The vbox_driver is instantiated only once in
the first call vboxGetDriverConnection function that is guarded by
a mutex.
* call vbox API initialize only when the first connection is
established, and likewise uninitialize when last connection
disconnects. The prevents each subsequent connection from overwriting
IVirtualBox/ISession instances of any other active connection that
led to libvirtd segfaults. The virConnectOpen and virConnectClose
implementations are guarded by mutex on the global vbox_driver_lock
where the global vbox_driver object counts connectios and decides
when it's safe to call vbox's init/uninit routines.
* add IVirutalBoxClient to vboxDriver and use it to in tandem with newer
pfnClientInitialize/pfnClientUninitalize APIs for vbox versions that
support it, to avoid usage of the old pfnComInitialize/Uninitialize.
Marc Hartmayer [Fri, 18 Nov 2016 13:18:27 +0000 (14:18 +0100)]
qemu: Removed an outdated comment in qemuDomainSaveImageStartVM()
Removed the comment 'Set the migration source' as it isn't valid anymore
and 'start it up' isn't useful as qemuProcessStart() is already a
speaking name.
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Bjoern Walk [Fri, 18 Nov 2016 13:18:26 +0000 (14:18 +0100)]
virutil: fix trailing '/' for path prefixes
The path prefixes for sysfs trees are always prepended by paths
beginning with a slash, making the trailing slash in the prefix
redundant.
Signed-off-by: Bjoern Walk <bwalk@linux.vnet.ibm.com> Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Marc Hartmayer [Fri, 18 Nov 2016 13:18:25 +0000 (14:18 +0100)]
virfile: Only generate a warning if there is something to report
Only generate a warning if there is something to report.
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Bjoern Walk <bwalk@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Michal Privoznik [Fri, 18 Nov 2016 10:45:44 +0000 (11:45 +0100)]
qemu: Update cgroup on chardev hotplug
Just like in the previous commit, we are not updating CGroups on
chardev hot(un-)plug and thus leaving qemu unable to access any
non-default device users are trying to hotplug.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Michal Privoznik [Fri, 18 Nov 2016 10:17:51 +0000 (11:17 +0100)]
qemu: Update cgroup on RNG hotplug
If users try to hotplug RNG device with a backend different to
/dev/random or /dev/urandom the whole operation fails as qemu is
unable to access the device. The problem is we don't update
device CGroups during the operation.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Michal Privoznik [Wed, 23 Nov 2016 07:28:51 +0000 (08:28 +0100)]
docs: Add apps.html link to index.html
I think when trying to introduce libvirt (we have a section for
that in our index page) it might be useful to promote success
stories - other applications that are based on libvirt.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
First it accesses domain object without domain lock.
Second it uses outdated logic that goes back to commit 79533da1 of
year 2009 when code was quite different. (unref function
instead of unreferencing only unlocked and disposed object
in case of last reference and leaved unlocking to the caller otherwise).
Nowadays this logic may lead to disposing locked object
i guess.
Another problem is that the callers of qemuDomainObjEnterAgent
use domain object again (namely priv->agent) without domain lock.
Sometimes after domain restart agent is unavailabe even
if it is up and running in guest. Diagnostic message is
"QEMU guest agent is not available due to an error"
that is 'priv->agentError' is set. Investiagion shows that
'priv->agent' is not NULL, so error flag is set probably
during domain shutdown process and not cleaned up eventually.
The patch is quite simple - just clean up error flag unconditionally
upon domain stop.
Other hunks address other cases when error flag is not cleaned up.
1. processSerialChangedEvent. We need to clean error flag
unconditionally here too. For example if upon first 'connected' event we
fail to connect and set error flag and then connect on second
'connected' event then error flag will remain set erroneously
and make agent unavailable.
2. qemuProcessHandleAgentEOF. If error flag is set and we get
EOF we need to change state (and diagnostic) from 'error' to
'not connected'.
qemu: agent: handle agent connection errors in one place
qemuConnectAgent return -1 or -2 in case of different errors.
A. -1 is a case of unsuccessuful connection to guest agent.
B. -2 is a case of destoyed domain during connection attempt.
All qemuConnectAgent callers handle the first error the same way
so let's move this logic into qemuConnectAgent itself. Patched
function returns 0 in case A and -1 in case B.
libvirtd: systemd: add special target for system shutdown
It is already discussed in "[RFC] daemon: remove hardcode dep on libvirt-guests" [1].
Mgmt can use means to save/restore domains on system shutdown/boot other than
libvirt-guests.service. Thus we need to specify appropriate ordering dependency between
libvirtd, domains and save/restore service. This patch takes approach suggested
in RFC and introduces a systemd target, so that ordering can be built next way:
Marc Hartmayer [Tue, 15 Nov 2016 18:25:41 +0000 (19:25 +0100)]
Refactoring: Use virHostdevIsSCSIDevice()
Use the util function virHostdevIsSCSIDevice() to simplify if
statements.
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Bjoern Walk <bwalk@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Marc Hartmayer [Tue, 15 Nov 2016 18:25:40 +0000 (19:25 +0100)]
util: Add virHostdevIsSCSIDevice()
Add the function virHostdevIsSCSIDevice() which detects whether a
hostdev is a SCSI device or not.
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Bjoern Walk <bwalk@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Marc Hartmayer [Tue, 15 Nov 2016 18:25:39 +0000 (19:25 +0100)]
qemu: Fix improper union member access on hostdevs
Add missing checks if a hostdev is a subsystem/SCSI device before access
the union member 'subsys'/'scsi'. Also fix indentation and simplify
qemuDomainObjCheckHostdevTaint().
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Bjoern Walk <bwalk@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Sławek Kapłoński [Fri, 11 Nov 2016 09:17:38 +0000 (10:17 +0100)]
Forbid new-line char in name of new storagepool
New line character in name of storagepool is now forbidden because it
mess virsh output and can be confusing for users.
Validation of name is done in driver, after parsing XML to avoid
problems with dissappeared pools which was already created with
new-line char in name.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Sławek Kapłoński [Fri, 11 Nov 2016 09:17:37 +0000 (10:17 +0100)]
Forbid new-line char in name of new domain
New line character in name of domain is now forbidden because it
mess virsh output and can be confusing for users.
Validation of name is done in drivers, after parsing XML to avoid
problems with dissappeared domains which was already created with
new-line char in name.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Peter Krempa [Tue, 22 Nov 2016 08:32:11 +0000 (09:32 +0100)]
qemu: monitor: Properly propagate the 'qemu_id' field through the matcher
Commit 3f71c797689a4a70 added 'qemu_id' field to track the id of the cpu
as reported by query-cpus. The patch did not include changes necessary
to propagate the id through the functions matching the data to the
libvirt cpu structures and thus all vcpus had id 0.
Peter Krempa [Tue, 22 Nov 2016 09:21:46 +0000 (10:21 +0100)]
tests: qemumonitorjson: Rename 'qemu-id' to 'enable-id' in cpu info test
The field is named 'enable_id' in other structures and a patch recently
added 'qemu_id' which has different semantics. To avoid confusion in the
tests rename the field.
Jiri Denemark [Sun, 20 Nov 2016 23:10:06 +0000 (00:10 +0100)]
qemu_monitor_json: Don't check existence of "return" object
Whenever qemuMonitorJSONCheckError returns 0, the "return" object is
guaranteed to exist. Thus virJSONValueObjectGetObject will never fail to
get it. On the other hand, virJSONValueObjectGetArray may fail since the
"return" object may not be an array.
Because this makes the font the same size as the non-monospaced one,
let's change those properties a little bit as well. <pre/> will be
shrunk a bit and <code/> inside <p/> or <dd/> will have slightly greyer
background.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Some of those were duplicate, so remove those. In order to better see
such things in the future, sort them so they are "regular, italic,
bold, bold-italic, light, light-italic".
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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