A future patch wants to create disk definitions with non-zero
default contents; to avoid crashes, all callers that allocate
a disk definition should go through a common point.

I found allocation points by looking for any code that increments
ndisks, as well as any matches for ALLOC.*disk.  Most places that
modified ndisks were covered by the parse from XML to domain/device
definition by initial domain creation or device hotplug; I also
hand-checked all drivers that generate a device struct on the
fly during getXMLDesc.

* src/conf/domain_conf.h (virDomainDiskDefNew): New prototype.
* src/conf/domain_conf.c (virDomainDiskDefNew): New function.
(virDomainDiskDefParseXML): Use it.
* src/parallels/parallels_driver.c (parallelsAddHddInfo):
Likewise.
* src/qemu/qemu_command.c (qemuParseCommandLine): Likewise.
* src/vbox/vbox_tmpl.c (vboxDomainGetXMLDesc): Likewise.
* src/vmx/vmx.c (virVMXParseDisk): Likewise.
* src/xenxs/xen_sxpr.c (xenParseSxprDisks, xenParseSxpr):
Likewise.
* src/xenxs/xen_xm.c (xenParseXM): Likewise.
* src/libvirt_private.syms (domain_conf.h): Export it.
Signed-off-by: NEric Blake <eblake@redhat.com>

As part of the work on backing chains, I'm finding that it would
be easier to directly manipulate chains of pointers (adding a
snapshot merely adjusts pointers to form the correct list) rather
than copy data from one struct to another. This patch converts
snapshot source to be a pointer.

In this patch, the pointer is ALWAYS allocated (any code that
increases ndisks now also allocates a source pointer for each
new disk), and all other changes are just mechanical fallout of
the new type; there should be no functional change.  It is
possible that we may want to leave the pointer NULL for internal
snapshots in a later patch, but as that requires a closer audit
of the source to ensure we don't fault on a null dereference, I
didn't do it here.

* src/conf/snapshot_conf.h (_virDomainSnapshotDiskDef): Change
type of src.
* src/conf/snapshot_conf.c: Adjust all clients.
* src/qemu/qemu_conf.c: Likewise.
* src/qemu/qemu_driver.c: Likewise.
Signed-off-by: NEric Blake <eblake@redhat.com>

A PCI device can be associated with a specific NUMA node. Later, when
a guest is pinned to one NUMA node the PCI device can be assigned on
different NUMA node. This makes DMA transfers travel across nodes and
thus results in suboptimal performance. We should expose the NUMA node
locality for PCI devices so management applications can make better
decisions.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

For converting bitmap data to human-readable strings.

It already reports an error if STRDUP fails.

This simplifies the usage in {libxl,qemu}DomainGetNumaParameters
and it's needed for consistent error reporting in virBitmapFormat.

Also remove the forgotten ATTRIBUTE_NONNULL marker.

Openstack uses (or will start to using) CPU info from the
capabilities XML. So this section is expanded, added CPU info
about arch, type and info about number of cores, sockets and threads.
Signed-off-by: NEric Blake <eblake@redhat.com>

Openstack Nova (starting at Icehouse release) requires this function
to start VM.
Signed-off-by: NEric Blake <eblake@redhat.com>

OpenStack Nova requires this function
to start VM instance. Cpumask info is obtained via prlctl utility.
Unlike KVM, Parallels Cloud Server is unable to set cpu affinity
mask for every VCpu. Mask is unique for all VCpu. You can set it
using 'prlctl set <vm_id|vm_name> --cpumask <{n[,n,n1-n2]|all}>'
command. For example, 'prlctl set SomeDomain --cpumask 0,1,5-7'
would set this mask to yy---yyy.
Signed-off-by: NEric Blake <eblake@redhat.com>

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

Commit fff74b27 moved the probing into virStorageFileGetMetadataFromBuf
but didn't update the format in volume definition.

https://bugzilla.redhat.com/show_bug.cgi?id=1104908

Jump out early if no metadata was detected (for directories).
Join the error and cleanup labels.

To match the convention:
ret - current function's return value
rc - other function's return values

This patch adds initial migration support to the libxl driver,
using the VIR_DRV_FEATURE_MIGRATION_PARAMS family of migration
functions.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Introduce a simple libxlDomainDefCheckABIStability() function that
can be used check ABI stability between two virDomainDef objects.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

On some systems, libnuma can be present but it's so ancient that
it misses some symbols that virNumaGetDistances() needs. To be
more precise: numa_bitmask_isbitset() and numa_nodes_ptr are the
symbols in question. Fortunately, they were both introduced in
the same release so it's sufficient for us to check for only one
of them. And the winner is numa_bitmask_isbitset().
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

In case the libvirt is built without numactl support, we're
missing the virNumaGetDistances() stub so the linking fails:

  CCLD     libvirt_lxc
libvirt_lxc-nodeinfo.o: In function `virNodeCapsGetSiblingInfo':
/home/zippy/tmp/libvirt.git/src/nodeinfo.c:1763: undefined reference to `virNumaGetDistances'
collect2: error: ld returned 1 exit status
make[3]: *** [libvirt_lxc] Error 1

The issue was introduced in 77c830d8.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

If user or management application wants to create a guest,
it may be useful to know the cost of internode latencies
before the guest resources are pinned. For example:

<capabilities>

  <host>
    ...
    <topology>
      <cells num='2'>
        <cell id='0'>
          <memory unit='KiB'>4004132</memory>
          <distances>
            <sibling id='0' value='10'/>
            <sibling id='1' value='20'/>
          </distances>
          <cpus num='2'>
            <cpu id='0' socket_id='0' core_id='0' siblings='0'/>
            <cpu id='2' socket_id='0' core_id='2' siblings='2'/>
          </cpus>
        </cell>
        <cell id='1'>
          <memory unit='KiB'>4030064</memory>
          <distances>
            <sibling id='0' value='20'/>
            <sibling id='1' value='10'/>
          </distances>
          <cpus num='2'>
            <cpu id='1' socket_id='0' core_id='0' siblings='1'/>
            <cpu id='3' socket_id='0' core_id='2' siblings='3'/>
          </cpus>
        </cell>
      </cells>
    </topology>
    ...
  </host>
  ...
</capabilities>

We can see the distance from node1 to node0 is 20 and within nodes 10.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

The API gets a NUMA node and find distances to other nodes.  The
distances are returned in an array. If an item X within the array
equals to value of zero, then there's no such node as X.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

If the leasehelper_path couldn't be found the code would leak the
freshly constructed command structure. Re-arrange code to avoid the
problem.

Found by coverity, broken by baafe668.

qemuMonitorJSONSendKey declares the "holdtime" argument as unsigned int
while the command was constructed in qemuMonitorJSONMakeCommand using
the "P" modifier which took a unsigned long from the variable
arguments which then made it possible to access uninitialized memory.

This broke the qemumonitorjsontest on 32bit fedora 20:
64) qemuMonitorJSONSendKey
... libvirt: QEMU Driver error : internal error: unsupported data type 'W' for arg 'WVSƒì ‹D$0è‘wÿÿÃAå' FAILED

Uncovered by upstream commit f744b831.

Additionally add test for the hold-time option.

The 'libxl_domain_config' object is stack allocated which means its
memory contents are undefined. The libxl_domain_config_dispose() call
is only safe if the memory is initialized to a defined state. Not all
code paths which reach libxl_domain_config_dispose() will ensure that
libxl_domain_config_init() is called. Move the libxl_domain_config_init()
call earlier in the function to ensure all codepaths have defined
memory state.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

To allow the test suite to creat the XML option object,
move the virDomainXMLOptionNew call into a libxlCreateXMLConf
method.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

To make it easier to test, change libxlBuildDomainConfig so
that it takes a virPortAllocatorPtr instead of the larger
libxlDriverPrivatePtr object.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

To make it easier to unit test, change libxlBuildDomainConfig
so that it takes 'virDomainDefPtr' and 'libxl_ctx *' objects
as separate parameters.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Some of the APIs already return int since they can produce errors that
need to be propagated. For consistency reasons, this patch changes the
rest of the APIs to also return int even though they do not fail or
report any errors.

In general, we should only remove a backend after seeing DEVICE_DELETED
event for a corresponding frontend.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

In general, we should only remove a backend after seeing DEVICE_DELETED
event for a corresponding frontend. This doesn't make any difference for
disks attached using -drive or drive_add since QEMU automatically
removes their backends but it's still better to make our code
consistent. And it may start making difference in case we switch to
attaching disks using -blockdev.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

[1] reported that we are removing network's backend too early. I didn't
really get the reproducer but libvirt behaves strangely when a guest
does not confirm the removal, e.g., it does not support PCI hotplug. In
such case, detaching a network device leaves its frontend in place but
removes the backend, which makes the device unusable for the guest.
Moreover attaching the same device again succeeds and both the guest and
libvirt will see two network interfaces attached but only one of them is
actually working.

I checked with Paolo Bonzini and he confirmed we should only remove a
backend after seeing DEVICE_DELETED event for a corresponding frontend.

[1] https://www.redhat.com/archives/libvir-list/2014-March/msg01740.htmlSigned-off-by: NJiri Denemark <jdenemar@redhat.com>

This patch adds option to specify that a json qemu command argument is
optional without the need to use if's or ternary operators to pass the
list. Additionally all the modifier characters are documented to avoid
user confusion.

To allow using the array manipulation macros on the arrays returned by
virStringSplit we need to know the count of the elements in the array.
Modify virStringSplit to return this value, rename it and add a helper
with the old name so that we don't need to update all the code.

Now we don't need to skip backing chain detection for remote disks.

Use the new backing store parser in the backing chain crawler. This
change needs one test change where information about the NBD image are
now parsed differently.

Add parsers for relative and absolute backing names for local and remote
storage files.

This parser parses relative paths as relative to their parents and
absolute paths according to the protocol or local access.

For remote storage volumes, all URI based backing file names are
supported and for the qemu colon syntax the NBD protocol is supported.

Use virStorageFileAccess() to to check whether the file is accessible in
the main part of the metadata crawler.

Use virStorageFileReadHeader() to read headers of storage files possibly
on remote storage to retrieve the image metadata.

The backend information is now parsed by
virStorageFileGetMetadataInternal which is now exported from the util
source and virStorageFileGetMetadataFromFDInternal now doesn't need to
be exported.

Use the virStorageFileGetUniqueIdentifier() function to get a unique
identifier regardless of the target storage type instead of relying on
canonicalize_path().

A new function that checks whether we support a given image is
introduced to avoid errors for unimplemented backends.

Add a new function wrapper and tweak the storage file backend lookup
function so that it can be used without reporting error. This will be
useful in the metadata crawler code where we need silently break if
metadata retrieval is not supported for the current storage type.

When walking the backing chain we previously set the storage type to
_FILE and let the virStorageFileGetMetadataFromFDInternal update it to
the correct type later on.

This patch moves the actual storage type determination to the place
where we parse the backing store name so that the code can later be
switched to use virStorageFileReadHeader() directly.

My future work will modify the metadata crawler function to use the
storage driver file APIs to access the files instead of accessing them
directly so that we will be able to request the metadata for remote
files too. To avoid linking the storage driver to every helper file
using the utils code, the backing chain traversal function needs to be
moved to the storage driver source.

Additionally the virt-aa-helper and virstoragetest programs need to be
linked with the storage driver as a result of this change.