The virCgroupMounted method is badly named, since a controller can be
mounted, but disabled in the current object. Rename the method to be
virCgroupHasController. Also make it tolerant to a  NULL virCgroupPtr
and out-of-range controller index, to avoid duplication of these
checks in all callers
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

This allows one use block type volume as the disk source for device
'lun'.

Since the source is already translated before. This just adds the
checking. Move !disk->shared and !disk->src to improve the performance
a bit.

To support "shareable" for volume type disk, we have to translate
the source before trying to add the shared disk entry. To achieve
the goal, this moves the helper qemuTranslateDiskSourcePool into
src/qemu/qemu_conf.c, and introduce an internal only member (voltype)
for struct _virDomainDiskSourcePoolDef, to record the underlying
volume type for use when building the drive string.

Later patch will support "shareable" volume type disk.

"seclabels" is only valid for 'file' or 'block' type storage volume.

"startupPolicy" is only valid for file type storage volume, otherwise
it fails on starting the domain.

This adds a new helper qemuTranslateDiskSourcePool which uses the
storage pool/vol APIs to translate the disk source before building
the drive string. Network volume is not supported yet. Disk chain
for volume type disk may be supported later, but before I'm confident
it doesn't break anything, it's just disabled now.

With this patch, one can specify the disk source using libvirt
storage like:

  <disk type='volume' device='disk'>
    <driver name='qemu' type='raw' cache='none'/>
    <source pool='default' volume='fc18.img'/>
    <target dev='vdb' bus='virtio'/>
  </disk>

"seclabels" and "startupPolicy" are not supported for this new
disk type ("volume"). They will be supported in later patches.

docs/formatdomain.html.in:
  * Add documents for new XMLs
docs/schemas/domaincommon.rng:
  * Add rng for new XMLs;
src/conf/domain_conf.h:
  * New struct for 'volume' type disk source (virDomainDiskSourcePoolDef)
  * Add VIR_DOMAIN_DISK_TYPE_VOLUME for enum virDomainDiskType
src/conf/domain_conf.c:
  * New helper virDomainDiskSourcePoolDefParse to parse the 'volume'
    type disk source.
  * New helper virDomainDiskSourcePoolDefFree to free the source def
    if 'volume' type disk.
tests/qemuxml2argvdata/qemuxml2argv-disk-source-pool.xml:
tests/qemuxml2xmltest.c:
  * New test

The code to format disk source is long enough to have a helper.

This finds the parent for vHBA by iterating over all the HBA
which supports vport_ops capability on the host, and return
the first one which is online, not saturated (vports in use
is less than max_vports).

startPool creates the vHBA if it's not existed yet, stopPool destroys
the vHBA. Also to support autostart, checkPool will creates the vHBA
if it's not existed yet.

The helper iterates over sysfs, to find out the matched scsi host
name by comparing the wwnn,wwpn pair. It will be used by checkPool
and refreshPool of storage scsi backend. New helper getAdapterName
is introduced in storage_backend_scsi.c, which uses the new util
helper virGetFCHostNameByWWN to get the fc_host adapter name.

It's possible to support fc_host adapter for phyp driver too, but
at this stage I'd like to not allow it when I'm not that clear
how it works.

It's only used by iscsi backend.

node device driver names the HBA like "scsi_host5", but storage
driver uses "host5", which could make the user confused. This
changes them to be consistent. However, for back-compat reason,
adapter name like "host5" is still supported.

This introduces 4 new attributes for storage pool source adapter.
E.g.

<adapter type='fc_host' parent='scsi_host5' wwnn='20000000c9831b4b' wwpn='10000000c9831b4b'/>

Attribute 'type' can be either 'scsi_host' or 'fc_host', and defaults
to 'scsi_host' if attribute 'name' is specified. I.e. It's optional
for 'scsi_host' adapter, for back-compat reason. However, mandatory
for 'fc_host' adapter and any new future adapter types. Attribute
'parent' is to specify the parent for the fc_host adapter.

* docs/formatstorage.html.in:
  - Add documents for the 4 new attrs
* docs/schemas/storagepool.rng:
  - Add RNG schema
* src/conf/storage_conf.c:
  - Parse and format the new XMLs
* src/conf/storage_conf.h:
  - New struct virStoragePoolSourceAdapter, replace "char *adapter" with it;
  - New enum virStoragePoolSourceAdapterType
* src/libvirt_private.syms:
  - Export TypeToString and TypeFromString
* src/phyp/phyp_driver.c:
  - Replace "adapter" with "adapter.data.name", which is member of the union
    of the new struct virStoragePoolSourceAdapter now. Later patch will
    add the checking, as "adapter.data.name" is only valid for "scsi_host"
    adapter.
* src/storage/storage_backend_scsi.c:
  - Like above
* tests/storagepoolxml2xmlin/pool-scsi-type-scsi-host.xml:
* tests/storagepoolxml2xmlin/pool-scsi-type-fc-host.xml:
  - New test for 'fc_host' and "scsi_host" adapter
* tests/storagepoolxml2xmlout/pool-scsi.xml:
  - Change the expected output, as the 'type' defaults to 'scsi_host' if 'name"
    specified now
* tests/storagepoolxml2xmlout/pool-scsi-type-scsi-host.xml:
* tests/storagepoolxml2xmlout/pool-scsi-type-fc-host.xml:
  - New test
* tests/storagepoolxml2xmltest.c:
  - Include the test

To avoid

virportallocatortest.c: In function 'bind':
virportallocatortest.c:34:33: warning: cast increases required alignment of target type [-Wcast-align]
     struct sockaddr_in *saddr = (struct sockaddr_in *)addr;
                                 ^
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

There are a number of places which generate cast alignment
warnings, which are difficult or impossible to address. Use
pragmas to disable the warnings in these few places

conf/nwfilter_conf.c: In function 'virNWFilterRuleDetailsParse':
conf/nwfilter_conf.c:1806:16: warning: cast increases required alignment of target type [-Wcast-align]
         item = (nwItemDesc *)((char *)nwf + att[idx].dataIdx);
conf/nwfilter_conf.c: In function 'virNWFilterRuleDefDetailsFormat':
conf/nwfilter_conf.c:3238:16: warning: cast increases required alignment of target type [-Wcast-align]
         item = (nwItemDesc *)((char *)def + att[i].dataIdx);

storage/storage_backend_mpath.c: In function 'virStorageBackendCreateVols':
storage/storage_backend_mpath.c:247:17: warning: cast increases required alignment of target type [-Wcast-align]
         names = (struct dm_names *)(((char *)names) + next);

nwfilter/nwfilter_dhcpsnoop.c: In function 'virNWFilterSnoopDHCPDecode':
nwfilter/nwfilter_dhcpsnoop.c:994:15: warning: cast increases required alignment of target type [-Wcast-align]
         pip = (struct iphdr *) pep->eh_data;
nwfilter/nwfilter_dhcpsnoop.c:1004:11: warning: cast increases required alignment of target type [-Wcast-align]
     pup = (struct udphdr *) ((char *) pip + (pip->ihl << 2));

nwfilter/nwfilter_learnipaddr.c: In function 'procDHCPOpts':
nwfilter/nwfilter_learnipaddr.c:327:33: warning: cast increases required alignment of target type [-Wcast-align]
                 uint32_t *tmp = (uint32_t *)&dhcpopt->value;
nwfilter/nwfilter_learnipaddr.c: In function 'learnIPAddressThread':
nwfilter/nwfilter_learnipaddr.c:501:43: warning: cast increases required alignment of target type [-Wcast-align]
                     struct iphdr *iphdr = (struct iphdr*)(packet +
nwfilter/nwfilter_learnipaddr.c:538:43: warning: cast increases required alignment of target type [-Wcast-align]
                     struct iphdr *iphdr = (struct iphdr*)(packet +
nwfilter/nwfilter_learnipaddr.c:544:48: warning: cast increases required alignment of target type [-Wcast-align]
                         struct udphdr *udphdr= (struct udphdr *)
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

When reading the inotify FD, we get back a sequence of
struct inotify_event, each with variable length data following.
It is not safe to simply cast from the char *buf to the
struct inotify_event struct since this may violate data
alignment rules. Thus we must copy from the char *buf
into the struct inotify_event instance before accessing
the data.

uml/uml_driver.c: In function 'umlInotifyEvent':
uml/uml_driver.c:327:13: warning: cast increases required alignment of target type [-Wcast-align]
         e = (struct inotify_event *)tmp;
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The current way virObject instances are allocated using
VIR_ALLOC_N causes alignment warnings

util/virobject.c: In function 'virObjectNew':
util/virobject.c:195:11: error: cast increases required alignment of target type [-Werror=cast-align]

Changing to use VIR_ALLOC_VAR will avoid the need todo
the casts entirely.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virNetlinkCommand() method takes an 'unsigned char **'
parameter to be filled with the received netlink message.
The callers then immediately cast this to 'struct nlmsghdr',
triggering (bogus) warnings about increasing alignment
requirements

util/virnetdev.c: In function 'virNetDevLinkDump':
util/virnetdev.c:1300:12: warning: cast increases required alignment of target type [-Wcast-align]
     resp = (struct nlmsghdr *)*recvbuf;
            ^
util/virnetdev.c: In function 'virNetDevSetVfConfig':
util/virnetdev.c:1429:12: warning: cast increases required alignment of target type [-Wcast-align]
     resp = (struct nlmsghdr *)recvbuf;

Since all callers cast to 'struct nlmsghdr' we can avoid
the warning problem entirely by simply changing the
signature of virNetlinkCommand to return a 'struct nlmsghdr **'
instead of 'unsigned char **'. The way we do the cast inside
virNetlinkCommand does not have any alignment issues.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Playing games with field offsets in a struct causes all sorts
of alignment warnings on ARM platforms

util/virkeycode.c: In function '__virKeycodeValueFromString':
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
     (*(typeof(field_type) *)((char *)(object) + field_offset))
       ^
util/virkeycode.c:91:28: note: in expansion of macro 'getfield'
         const char *name = getfield(virKeycodes + i, const char *, name_offset);
                            ^
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
     (*(typeof(field_type) *)((char *)(object) + field_offset))
       ^
util/virkeycode.c:94:20: note: in expansion of macro 'getfield'
             return getfield(virKeycodes + i, unsigned short, code_offset);
                    ^
util/virkeycode.c: In function '__virKeycodeValueTranslate':
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
     (*(typeof(field_type) *)((char *)(object) + field_offset))
       ^
util/virkeycode.c:127:13: note: in expansion of macro 'getfield'
         if (getfield(virKeycodes + i, unsigned short, from_offset) == key_value)
             ^
util/virkeycode.c:26:7: warning: cast increases required alignment of target type [-Wcast-align]
     (*(typeof(field_type) *)((char *)(object) + field_offset))
       ^
util/virkeycode.c:128:20: note: in expansion of macro 'getfield'
             return getfield(virKeycodes + i, unsigned short, to_offset);

There is no compelling reason to use a struct for the keycode
tables. It can easily just use an array of arrays instead,
avoiding all alignment problems
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Validate that translations between different keycode sets
are functioning.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

For both "live" and "config" changes of vcpupin and emulatorpin, an
all clear bitmap doesn't make sense, and it can just cause corruptions.
E.g (similar for emulatorpin).

% virsh vcpupin hame 0 8,^8 --config

% virsh vcpupin hame
VCPU: CPU Affinity
----------------------------------
   0:
   1: 0-63
   2: 0-63
   3: 0-63

% virsh dumpxml hame | grep cpuset
    <vcpupin vcpu='0' cpuset=''/>

% virsh start hame
error: Failed to start domain hame
error: An error occurred, but the cause is unknown

This introduce a new attribute "num_queues" (same with the good name
QEMU uses) for virtio-scsi controller. An example of the XML:

<controller type='scsi' index='0' model='virtio-scsi' num_queues='8'/>

The corresponding QEMU command line:

-device virtio-scsi-pci,id=scsi0,num_queues=8,bus=pci.0,addr=0x3 \

By default, libtool builds two .o files for every .lo rule:
src/foo.o - static builds
src/.libs/foo.o - shared library builds

But since commit ad42b34b disabled static builds, src/foo.o is
no longer built by default.  On a fresh checkout, this means our
protocol check rules using pdwtags were testing a missing file,
and thanks to a lousy behavior of pdwtags happily giving no output
and 0 exit status (http://bugzilla.redhat.com/949034), we were
merely claiming that "dwarves is too old" and skipping the test.

However, if you swap between branches and do incremental builds,
such as building v0.10.2-maint and then switching back to master,
you end up with src/foo.o being leftover from its 0.10.2 state,
and then 'make check' fails because the .o file does not match
the protocol-structs file due to API additions in the meantime.

A simpler fix would be to always look in .libs for the .o to
be parsed; but since it is possible to pass ./configure options
to tell libtool to do a static-only build with no shared .o,
I went with the approach of finding the newest of the two files,
whenever both exist.

* src/Makefile.am (PDWTAGS): Ensure we test just-built file.

Newer pod (hello rawhide) complains if you attempt to mix bullets
and non-bullets in the same list:

virsh.pod around line 3177: Expected text after =item, not a bullet

As our intent was to nest an inner list, we make that explicit to
keep pod happy.

* tools/virsh.pod (ENVIRONMENT): Use correct pod syntax.

When setting processor count for a domain using the API libvirt enforced
a maximum processor count, while it isn't enforced when taking the XML path.

This patch removes the check to match the XML.

Currently when getting an instance of virCgroupPtr we will
create the path in all cgroup controllers. Only at the virt
driver layer are we attempting to filter controllers. This
is bad because the mere act of creating the dirs in the
controllers can have a functional impact on the kernel,
particularly for performance.

Update the virCgroupForDriver() method to accept a bitmask
of controllers to use. Only create dirs in the controllers
that are requested. When creating cgroups for domains,
respect the active controller list from the parent cgroup
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virCgroupGetAppRoot is not clear in its meaning. Change
to virCgroupForSelf to highlight that this returns the
cgroup config for the caller's process
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The linker will ignore LD_PRELOAD libraries which do not
exist, just printing a warning message. This is not helpful
for the test suite which will be utterly fubar without the
preload library present. Add an explicit test for existence
of the library to protect against this
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Split the "resource" define out into multiple smaller
defines, one for each type of resource tuning parameter.
This makes the schema a bit clearer to read
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The last Viktor's effort to fix the race and memory corruption unfortunately
wasn't complete in the case the close callback was not registered in an
connection. At that time, the trail of event's that I'll describe later could
still happen and corrupt the memory or cause a crash of the client (including
the daemon in case of a p2p migration).

Consider the following prerequisities and trail of events:
Let's have a remote connection to a hypervisor that doesn't have a close
callback registered and the client is using the event loop. The crash happens in
cooperation of 2 threads. Thread E is the event loop and thread W is the worker
that does some stuff. R denotes the remote client.

1.) W - The client finishes everything and sheds the last reference on the client
2.) W - The virObject stuff invokes virConnectDispose that invokes doRemoteClose
3.) W - the remote close method invokes the REMOTE_PROC_CLOSE RPC method.
4.) W - The thread is preempted at this point.
5.) R - The remote side receives the close and closes the socket.
6.) E - poll() wakes up due to the closed socket and invokes the close callback
7.) E - The event loop is preempted right before remoteClientCloseFunc is called
8.) W - The worker now finishes, and frees the conn object.
9.) E - The remoteClientCloseFunc accesses the now-freed conn object in the
        attempt to retrieve pointer for the real close callback.
10.) Kaboom, corrupted memory/segfault.

This patch tries to fix this by introducing a new object that survives the
freeing of the connection object. We can't increase the reference count on the
connection object itself or the connection would never be closed, as the
connection is closed only when the reference count reaches zero.

The new object - virConnectCloseCallbackData - is a lockable object that keeps
the pointers to the real user registered callback and ensures that the
connection callback is either not called if the connection was already freed or
that the connection isn't freed while this is being called.

This patch improves the error message after disconnecting from the
hypervisor and adds the close callback operations required not to leak
the callback reference.

The function is used to establish connection so it should be in the main
virsh file. This movement also enables further improvements done in next
patches.

Note that the "connect" command has moved from the host section of virsh to the
main section. It is now listed by 'virsh help virsh' instead of 'virsh help
host'.

Before closing the connection we unregister the close callback
to prevent a reference leak.

Further, the messages on virConnectClose != 0 are a bit more specific
now.
Signed-off-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>

By adjusting the reference count of the connection object we
prevent races between callback function and virConnectClose.
Signed-off-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>

This patch refactors various places to allow removing of the
defaultConsoleTargetType callback from the virCaps structure.

A new console character device target type is introduced -
VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_NONE - to mark that no type was
specified in the XML. This type is at the end converted to the standard
VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL. Other types that are
different from this default have to be processed separately in the
device post parse callback.