Each unique event ID will thus be composed by 1 byte for the namespace
and 1 byte for a namespace-specific ID. The namespace for domain event
needs to be 0 for compatibility reasons.

The virDomainEvent class is kept as it indicates what meta informations
are valid for the children classes. This may be useful in the future.

RIP virDomainEvent union. All data are now stored in each
virObjectEvent subclass.

This change may be confusing at first, but provides a much more
consistent naming scheme for the virObjectEvent children construction
functions.

This aims at providing some consistency with other domain events

Added a parent class virObjectEvent for future event types

Keep virDomainEventStateRegisterID as a convenience wrapper around
this new function.

Keep the legacy Domain lifecycle event functions as is.

Leave virDomainEventRegister and its Deregister brother as these are
legacy functions only for domain lifecycle events.

The event queue will be generalized to hold events related
to any object type.

The metadata struct will hold the unique identifiers for
any type of object, though not all fields will be used
for all types.

The event callbacks will be generalized to handle events
for any object type.

These unit tests are aiming at providing some help during the domain
events refactoring.

- systemctl and the %systemd_* RPM macros can take multiple unit names
  in the one invocation. Make use of this to avoid repeated systemd
  daemon reloads.

- virtlockd was only properly enabled and disabled when using systemd,
  but when systemd RPM macros were not available (e.g. on Fedora < 18).
  Make sure it's enabled when systemd RPM macros are present, or when
  using initscripts.

- Always use "reload" on virtlockd, not "condrestart". This allows it to
  cleanly re-execute itself without losing running state. Ignore any
  error should the reload fail.

- Move the reloading of virtlockd and libvirtd via their initscripts
  into the daemon package's %postun scriptlet. These services must be
  restarted after all of the libvirt-daemon-driver-* packages have
  been upgraded during the same RPM transaction.

- Add a %triggerpostun executed only when upgrading an older
  libvirt-daemon. As an older package would only reload libvirtd during
  %post, and the newer package would only reload libvirtd during
  %postun, such an upgrade would not reload libvirtd at all without the
  trigger.
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>

Also use a distinct, valid exit status for daemon re-execution failure.
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>

SIGHUP is commonly used to instruct a daemon to reload its config. For
now we should handle it in virtlockd just like SIGUSR1, rather than
having it kill the process.
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

- Use SIGUSR1, not SIGHUP, on reload. At present, virtlockd only
  responds to the former.

- Fix PID file for virtlockd.

- Do not start virtlockd in any runlevels by default. It needs to be
  explicitly selected in libvirt's qemu.conf anyway, so there is no
  need to have it running on all systems regardless.

- Fix chkconfig priorities to ensure virtlockd is started before
  libvirtd is started, and stopped after libvirtd is stopped.

- Add "Should-Start: virtlockd" to the libvirtd initscript's LSB header,
  for the same reason.

- Add "Default-Stop" to both libvirtd and virtlockd initscripts. LSB
  does not guarantee that this defaults to the inverse of
  "Default-Start".
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

- Pass VIRTLOCKD_ARGS through to virtlockd.

- Use SIGUSR1, not SIGHUP, in ExecReload. At present, virtlockd only
  responds to the former.

- Have "systemctl enable virtlockd.service" enable virtlockd.socket,
  rather than throw an error.

- Make virtlockd.socket wanted by sockets.target, rather than
  multi-user.target. This is consistent with other socket units in
  Fedora, and it ensures that the socket is available before libvirtd is
  started.
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>

When changing memtune limits to unlimited with AFFECT_CONFIG, the
values in virDomainDef are set to PARAM_UNLIMITED, which causes the
whole <memtune> to be formatted.  This can be changed in all drivers,
but it also makes sense to use the default (0) as another value for
"unlimited", since zero memory limit makes no sense.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

For dead domains that have no memtune limits, we return 0 instead of
"unlimited", this patch fixes it to return PARAM_UNLIMITED.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

Since kernel 3.12 (commit 34ff8dc08956098563989d8599840b130be81252 in
linux-stable.git in particular) the value for 'unlimited' in cgroup
memory limits changed from LLONG_MAX to ULLONG_MAX.  Due to rather
unfortunate choice of our VIR_DOMAIN_MEMORY_PARAM_UNLIMITED constant
(which we transfer as an unsigned long long in Kibibytes), we ended up
with the situation described below (applies to x86_64):

 - 2^64-1 (ULLONG_MAX) -- "unlimited" in kernel = 3.12

 - 2^63-1 (LLONG_MAX) -- "unlimited" in kernel < 3.12
 - 2^63-1024 -- our PARAM_UNLIMITED scaled to Bytes

 - 2^53-1 -- our PARAM_UNLIMITED unscaled (in Kibibytes)

This means that when any number within (2^63-1, 2^64-1] is read from
memory cgroup, we are transferring that number instead of "unlimited".
Unfortunately, changing VIR_DOMAIN_MEMORY_PARAM_UNLIMITED would break
ABI compatibility and thus we have to resort to a different solution.

With this patch every value greater than PARAM_UNLIMITED means
"unlimited".  Even though this may seem misleading, we are already in
such unclear situation when running 3.12 kernel with memory limits set
to 2^63.

One example showing most of the problems at once (with kernel 3.12.2):
 # virsh memtune asdf --hard-limit 9007199254740991 --swap-hard-limit -1
 # echo 12345678901234567890 >\
/sys/fs/cgroup/memory/machine/asdf.libvirt-qemu/memory.soft_limit_in_bytes
 # virsh memtune asdf
 hard_limit     : 18014398509481983
 soft_limit     : 12056327051986884
 swap_hard_limit: 18014398509481983
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

We were unconditionally removing the device from the host list, when it
should only be done on error.

This fixes USB collision detection when hotplugging the same device to
two guests.

If we hit a collision, we free the USB device while it is still part
of our temporary USBDeviceList. When the list is unref'd, the device
is free'd again.

Make the initial device freeing dependent on whether it is present
in the temporary list or not.

Similar to what Jiri did for cgroup setup/teardown in 05e149f9, push
it all into the device handler functions so we can do the necessary prep
work before claiming the device.

This also fixes hotplugging USB devices by product/vendor (virt-manager's
default behavior):

https://bugzilla.redhat.com/show_bug.cgi?id=1016511

Mention the need to set memtune/hard_limit.

https://bugzilla.redhat.com/show_bug.cgi?id=1035954

The libvirt-daemon package contains several driver-specific files,
directories, and script, which can be problematic when building the
package with multiple hypervisor support, e.g. both QEMU and Xen.

E.g. installing a QEMU+Xen enabled libvirt-daemon on a Xen-only system
will result in the creation of qemu and kvm groups and a qemu user.

Move the driver-specific files, directories, and script to the
respective driver subpackages.

Collapse the various {with_<hypervisor>} conditionals in the
libvirt-daemon package files section into a single {with_<hypervisor>}
conditional