The xen driver will generate a migration port if only a hostname is passed
in the optional migrate URI, so let's do the same in qemu.

* src/qemu/qemu_conf.c: change the error message to refer to
  'cgroup_controllers' instead of 'cgroup_device_acl'

Signed-off-by: NChris Lalancette <clalance@redhat.com>

This adds simple support for configuring a guest with a QEMU/KVM
virtual hardware watchdog device.

If the the qemu and kvm binaries are the same, we don't include machine
types in the kvm domain info.

However, the code which refreshes the machine types info from the
previous capabilities structure first looks at the kvm domain's info,
finds it matches and then copies the empty machine types list over
for the top-level qemu domain.

That doesn't make sense, we shouldn't copy an empty machin types list.

* src/qemu/qemu_conf.c: qemudGetOldMachinesFromInfo(): don't copy an
  empty machine types list.

Normally, when you migrate a domain from host A to host B,
the domain on host A remains defined but shutoff and the domain
on host B remains running but is a "transient".  Add a new
flag to virDomainMigrate() to allow the original domain to be
undefined on source host A, and a new flag to virDomainMigrate() to
allow the new domain to be persisted on the destination host B.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

The logic for running the decompression programs was broken in
commit f2387093, so that for
non-raw formats the decompression program was never run, and
for raw formats, it tried to exec an argv[] with initial NULL
in the program name.

* src/qemu/qemu_driver.c: Fix logic in runing decompression program

Introduces several new public API options for migration

 - VIR_MIGRATE_PEER2PEER: With this flag the client only
   invokes the virDomainMigratePerform method, expecting
   the source host driver to do whatever is required to
   complete the entire migration process.
 - VIR_MIGRATE_TUNNELLED: With this flag the actual data
   for migration will be tunnelled over the libvirtd RPC
   channel. This requires that VIR_MIGRATE_PEER2PEER is
   also set.
 - virDomainMigrateToURI: This is variant of the existing
   virDomainMigrate method which does not require any
   virConnectPtr for the destination host. Given suitable
   driver support, this allows for all the same modes as
   virDomainMigrate()

The URI for VIR_MIGRATE_PEER2PEER must be a valid libvirt
URI. For non-p2p migration a hypervisor specific migration
URI is used.

virDomainMigrateToURI without a PEER2PEER flag is only
support for Xen currently, and it involves XenD talking
directly to XenD, no libvirtd involved at all.

* include/libvirt/libvirt.h.in: Add VIR_MIGRATE_PEER2PEER
  flag for migration
* src/libvirt_internal.h: Add feature flags for peer to
  peer migration (VIR_FEATURE_MIGRATE_P2P) and direct
  migration (VIR_MIGRATE_PEER2PEER mode)
* src/libvirt.c: Implement support for VIR_MIGRATE_PEER2PEER
  and virDomainMigrateToURI APIs.
* src/xen/xen_driver.c: Advertise support for DIRECT migration
* src/xen/xend_internal.c: Add TODO item for p2p migration
* src/libvirt_public.syms: Export virDomainMigrateToURI
  method
* src/qemu/qemu_driver.c: Add support for PEER2PEER and
  migration, and adapt TUNNELLED migration.
* tools/virsh.c: Add --p2p and --direct args and use the
  new virDomainMigrateToURI method where possible.

Re-arrange the doTunnelMigrate method putting all non-QEMU local
state setup steps first. This maximises chances of success before
then starting destination QEMU for receiving incoming migration.
Altogether this can reduce the number of goto cleanup labels to
something more managable.

* qemu/qemu_driver.c: Re-order steps in doTunnelMigrate

Simplify the doTunnelMigrate code by pulling out the code for
sending all tunnelled data into separate helper

* qemu/qemu_driver.c: introduce doTunnelSendAll() method

Simplify the doTunnelMigrate() method by pulling out the code
which opens/closes the virConnectPtr  object into a parent
method

* qemu/qemu_driver.c: Add doPeer2PeerMigrate which then calls
  doTunnelMigrate with dconn & dom_xml

virStreamAbort is needed when the caller wishes to terminate
the stream early, not when virStreamSend fails.

* qemu/qemu_driver.c: Fix calling of virStreamAbort during
  tunnelled migration

The code for tunnelled migration was added in a dedicated method,
but the native migration code is still inline in the top level
qemudDomainMigratePerform() API. Move the native code out into
a dedicated method too to make things more maintainable.

* src/qemu/qemu_driver.c: Pull code for performing a native
  QEMU migration out into separate method

Since virMigratePrepareTunnel() is used for migration over the
native libvirt connection, there is never any need to pass the
target URI to this method.

* daemon/remote.c, src/driver.h, src/libvirt.c, src/libvirt_internal.h,
  src/qemu/qemu_driver.c, src/remote/remote_driver.c,
  src/remote/remote_protocol.c, src/remote/remote_protocol.h,
  src/remote/remote_protocol.x: Remove 'uri_in' parameter from
  virMigratePrepareTunnel() method

* src/qemu/qemu_driver.c: The positive return value of
  qemuMonitorSetBalloon should be handled as a success

When James Morris originally submitted his sVirt patches (as seen in
libvirt 0.6.1), he did not require on disk labelling for
virSecurityDomainRestoreImageLabel. A later commit[2] changed this
behavior to assume on disk labelling, which halts implementations for
path-based MAC systems such as AppArmor and TOMOYO where
vm->def->seclabel is required to obtain the label.

* src/security/security_driver.h src/qemu/qemu_driver.c
  src/security/security_selinux.c: adds the 'virDomainObjPtr vm'
  argument back to *RestoreImageLabel

Fix migration, broken in two different ways by the QEMU monitor
abstraction.  Note that the QEMU console emits a "\r\n" as the
line-ending.

* src/qemu/qemu_monitor_text.c (qemuMonitorGetMigrationStatus):
Fix "info migrate" command and its output's parsing.

Implementation of tunnelled migration, using a Unix Domain Socket
on the qemu backend.  Note that this requires very new versions of
qemu (0.10.7 at least) in order to get the appropriate bugfixes.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

The upcoming tunnelled migration needs to be able to set
a migration in progress in the background, as well as
be able to cancel a migration when a problem has happened.
This patch allows for both of these to properly work.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

Signed-off-by: NChris Lalancette <clalance@redhat.com>

When using VNC for graphics + keyboard + mouse, we shouldn't
then use the host OS for audio. Audio should go back over
VNC.

When using SDL for graphics, we should use the host OS for
audio since that's where the display is. We need to allow
certain QEMU env variables to be passed through to guest
too to allow choice of QEMU audio backend.

* qemud/libvirtd.sysconf: Mention QEMU/SDL audio env vars
* src/qemu_conf.c: Passthrough QEMU/SDL audio env for SDL display,
  disable host audio for VNC display

* src/qemu/qemu_driver.c: Fix crash in scenario where XML
  parsing of hotplugged device failed & thus 'dev' is NULL

* src/qemu/qemu_monitor_text.c: Always print command and reply
  in qemuMonitorCommandWithHandler. Print all args in each monitor
  command API & remove redundant relpy printing

* src/qemu/qemu_monitor_text.h: Remove qemudMonitorCommand,
  qemudMonitorCommandWithFd, qemudMonitorCommandWithHandler,
  qemudMonitorCommandExtra low level APIs
* src/qemu/qemu_monitor_text.c: Replace s/qemud/qemuMonitor/

* src/qemu/qemu_monitor.h, src/qemu/qemu_monitor.c: Add new
  qemuMonitorRemoveHostNetwork() command for removing host
  networks
* src/qemu/qemu_driver.c: Convert NIC hotplug methods over
  to use qemuMonitorRemoveHostNetwork()

* src/qemu/qemu_conf.h, src/qemu/qemu_conf.c: Remove prefix arg
  from qemuBuildHostNetStr which is no longer required
* src/qemu/qemu_driver.c: Refactor to use qemuMonitorAddHostNetwork()
  API for adding host network
* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorAddHostNetwork() method for adding host networks

* src/qemu/qemu_conf.c: Remove separator from qemuBuildNicStr()
  args, and remove hardcoded 'nic' prefix. Leave it upto callers
  instead
* src/qemu/qemu_driver.c: Switch over to using the new
  qemuMonitorAddPCINetwork() method for NIC hotplug
* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorAddPCINetwork API for PCI network device hotplug

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorCloseFileHandle and qemuMonitorSendFileHandle
  APIs for processing file handles
* src/qemu/qemu_driver.c: Convert NIC hotplug method over to
  use   qemuMonitorCloseFileHandle and qemuMonitorSendFileHandle

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  API qemuMonitorAddPCIDisk()
* src/qemu/qemu_driver.c: Convert over to using the new
  qemuMonitorAddPCIDisk() method, and remove now obsolete
  qemudEscape() method

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new API
  qemuMonitorRemovePCIDevice() for removing PCI device
* src/qemu/qemu_driver.c: Convert all places removing PCI devices
  over to new qemuMonitorRemovePCIDevice() API

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  API qemuMonitorAddPCIHostDevice()
* src/qemu/qemu_driver.c: Switch to using qemuMonitorAddPCIHostDevice()
  for PCI host device hotplug

One API adds an exact device based on bus+dev, the other adds
any device matching vendor+product

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorAddUSBDeviceExact() and qemuMonitorAddUSBDeviceMatch()
  commands.
* src/qemu/qemu_driver.c: Switch over to using the new
    qemuMonitorAddUSBDeviceExact() and qemuMonitorAddUSBDeviceMatch()

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorAddUSBDisk() API
* src/qemu/qemu_driver.c: Switch USB disk hotplug to the new
  src/qemu/qemu_driver.c API.

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorMigrateToCommand() API
* src/qemu/qemu_driver.c: Switch over to using the
  qemuMonitorMigrateToCommand() API for core dumps and save
  to file APIs

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new API
  qemuMonitorMigrateToHost() for doing TCP migration
* src/qemu/qemu_driver.c: Convert to use qemuMonitorMigrateToHost().
  Also handle proper URIs (tcp:// as well as tcp:)

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add new
  qemuMonitorGetMigrationStatus() command.
* src/qemu/qemu_driver.c: Use new qemuMonitorGetMigrationStatus()
  command to check completion status.

* src/qemu/qemu_driver.c: Use new qemuMonitorSetMigrationSpeed()
  API during migration
* src/qemu/qemu_monitor.h, src/qemu/qemu_monitor.c: Add new
  qemuMonitorSetMigrationSpeed() API

* src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h: Add a new
  qemuMonitorGetBlockStatsInfo() command
* src/qemu/qemu_driver.c: Remove directly use of blockstats in
  favour of calling qemuMonitorGetBlockStatsInfo()

* src/qemu/qemu_monitor.h, src/qemu/qemu_monitor.c: Add new APIs
  qemuMonitorSaveVirtualMemory() and qemuMonitorSavePhysicalMemory()
* src/qemu/qemu_driver.c: Use the new qemuMonitorSaveVirtualMemory()
  and qemuMonitorSavePhysicalMemory() APIs