Performs binary subtraction of two bitmaps. Stores result in the first
operand.

So, systemd-machined has this philosophy that machine names are like
hostnames and hence should follow the same rules.  But we always allowed
international characters in domain names.  Thus we need to modify the
machine name we are passing to systemd.

In order to change some machine names that we will be passing to systemd,
we also need to call TerminateMachine at the end of a lifetime of a
domain.  Even for domains that were started with older libvirt.  That
can be achieved thanks to virSystemdGetMachineNameByPID().  And because
we can change machine names, we can get rid of the inconsistent and
pointless escaping of domain names when creating machine names.

So this patch modifies the naming in the following way.  It creates the
name as <drivername>-<id>-<name> where invalid hostname characters are
stripped out of the name and if the resulting name is longer, it
truncates it to 64 characters.  That way we can start domains we
couldn't start before.  Well, at least on systemd.

To make it work all together, the machineName (which is needed only with
systemd) is saved in domain's private data.  That way the generation is
moved to the driver and we don't need to pass various unnecessary
arguments to cgroup functions.

The only thing this complicates a bit is the scope generation when
validating a cgroup where we must check both old and new naming, so a
slight modification was needed there.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1282846Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

The virDomainSnapshotDefFormat calls into virDomainDefFormat,
so should be providing a non-NULL virCapsPtr instance. On the
qemu driver we change qemuDomainSnapshotWriteMetadata to also
include caps since it calls virDomainSnapshotDefFormat.
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

The virDomainObjFormat and virDomainSaveStatus methods
both call into virDomainDefFormat, so should be providing
a non-NULL virCapsPtr instance.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Fix build fail introduced as a side effect of commit d239a542.

Pushed under the build breaker rule.

Signed-off-by: NNikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>

Few build breaking mistakes in less-popular parts of our code.

Rather than have a unwieldy regex string - split it up into its components
each having it's own #define and then combine in a different #define
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Use the newly added virCapabilitiesSetNetPrefix to set
the network prefix for the driver. This in return will
be use by NetDefFormat() and NetDefParseXML() routines
to free any interface name that start with the registered
prefix.
Acked-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

virDomainSaveConfig calls virDomainDefFormat which was setting the caps
to NULL, thus keeping the old behaviour (i.e. not looking at
netprefix). This patch adds the virCapsPtr to the function and allows
the configuration to be saved and skipping interface names that were
registered with virCapabilitiesSetNetPrefix().
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

And use the newly added caps->host.netprefix (if it exists) for
interface names that match the autogenerated target names.
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

And use the newly added caps->host.netprefix for free interface
names that match the autogenerated target names.
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

In the reverted commit d2e5538b, the libxl driver was changed to copy
interface names autogenerated by libxl to the corresponding network def
in the domain's virDomainDef object. The copied name is freed when the
domain transitions to the shutoff state. But when migrating a domain,
the autogenerated name is included in the XML sent to the destination
host.  It is possible an interface with the same name already exists on
the destination host, causing migration to fail.

This patch defines a new capability for setting the network device
prefix that will be used in the driver. Valid prefixes are
VIR_NET_GENERATED_PREFIX or the one announced by the driver.
Signed-off-by: NJoao Martins <joao.m.martins@oracle.com>

Make 'virsh -V' list ZFS storage backend if it's enabled.

ZFS-on-Linux implementation of ZFS starting with version 0.6.4
contains all the features we use. Additionally, as we support
'volmode' option handling that's not available on ZoL but is
available on FreeBSD, there is no need to block ZFS storage driver
on Linux anymore.

So un-mark zfs storage driver as FreeBSD-only.

There are slight differences in various ZFS implementations.
Specifically, ZFS on FreeBSD requires to set value of 'volmode'
option to 'dev' to expose volumes as raw disk device (that's what
we need) rather than geom provides, for example.

With ZFS on Linux, however, such option is not available and
volumes exposed like we need by default.

To make our implementation more flexible, only pass 'volmode'
when it's supported. Support is checked by parsing usage
information of the 'zfs get' command.

Same as for deserializer, this method might get handy for admin one day.
The major reason for this patch is to stay consistent with idea, i.e.
when deserializer can be shared, why not serializer as well. The only
problem to be solved was that the daemon side serializer uses a code
snippet which handles sparse arrays returned by some APIs as well as
removes any string parameters that can't be returned to older clients.
This patch makes of the new virTypedParameterRemote datatype introduced
by one of the pvious patches.

Since the method is static to remote_driver, it can't even be used by our
daemon. Other than that, it would be useful to be able to use it with admin as
well. This patch uses the new virTypedParameterRemote datatype introduced in
one of previous patches.

Currently, the deserializer is hardcoded into remote_driver which makes
it impossible for admin to use it. One way to achieve a shared implementation
(besides moving the code to another module) would be pass @ret_params_val as a
void pointer as opposed to the remote_typed_param pointer and add a new extra
argument specifying which of those two protocols is being used and typecast
the pointer at the function entry. An example from remote_protocol:

struct remote_typed_param_value {
        int type;
        union {
                int i;
                u_int ui;
                int64_t l;
                uint64_t ul;
                double d;
                int b;
                remote_nonnull_string s;
        } remote_typed_param_value_u;
};
typedef struct remote_typed_param_value remote_typed_param_value;

struct remote_typed_param {
        remote_nonnull_string field;
        remote_typed_param_value value;
};

That would leave us with a bunch of if-then-elses that needed to be used across
the method. This patch takes the other approach using the new datatype
introduced in one of earlier commits.

Both admin and remote protocols define their own types
(remote_typed_param vs admin_typed_param). Because of the naming convention,
admin typed params wouldn't be able to reuse the serialization/deserialization
methods, which are tailored for use by remote protocol, even if those method
were exported properly. In that case, introduce a new internal data type
structurally copying both admin and remote protocols which, eventually, would
allow serializer and deserializer to be used in a more generic way.

A pretty nasty deadlock occurs while trying to rename a VM in parallel
with virDomainObjListNumOfDomains.
The short description of the problem is as follows:

Thread #1:

qemuDomainRename:
    ------> aquires domain lock by qemuDomObjFromDomain
       ---------> waits for domain list lock in any of the listed functions:
          - virDomainObjListFindByName
          - virDomainObjListRenameAddNew
          - virDomainObjListRenameRemove

Thread #2:

virDomainObjListNumOfDomains:
    ------> aquires domain list lock
       ---------> waits for domain lock in virDomainObjListCount

Introduce generic virDomainObjListRename function for renaming domains.
It aquires list lock in right order to avoid deadlock. Callback is used
to make driver specific domain updates.
Signed-off-by: NNikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

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

This reverts commit 0e0149ce.

That commit was added to comply with systemd rules that were changed in
the meantime, so this patch is pointless.

Do not store the return value of virDomainParseScaledValue,
it was overwritten anyway.

Delete the cleanup label, there is nothing to clean up.

Free the old vcpupids array in case when this function is called again
during the run of the VM. It will be later reused in the vCPU hotplug
code. The function now returns the number of detected VCPUs.

Future patches will tweak and reuse the function in different places so
move it separately first.

Avoid using virDomainDefSetVcpus when we can set it directly in the
structure.

In some cases it may be better to have a bitmap representing state of
individual vcpus rather than iterating the definition. The new helper
creates a bitmap representing the state from the domain definition.

Use 'ret' for return variable name, clarify use of 'param_idx' and avoid
unnecessary 'success' label. No functional changes. Also document the
function.

Since commit 71408079 we are generating
socket path later than before -- when starting a domain.  That makes one
particular inconsistent state of a chardev, which was not possible
before, currently valid.  However, SELinux security driver forgot to
guard the main restoring function by a check for NULL-paths.  So make it
no-op for NULL paths, as in the DAC driver.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1300532Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

There might be cases, like with typed params, where triggering this check isn't
desirable. But including the whole module in the exception regex is not always
to right way of doing things. By adding an option to manually disable this check
on a specific occurrence, the module itself will still be checked against the
rule.

In case of guest panicked, preserved crashed domain has stopped CPUs.
It's not possible to use tools like WinDbg for the problem investigation
until we start CPUs back.

Error paths after sending the event that domain is started written as if ret = -1
which is set at the beginning of the function. It's common idioma to keep 'ret'
equal to -1 until the end of function where it is set to 0. But here we use ret
to keep result of restore operation too and thus breaks the idioma and its users :)

Let's use different variable to hold restore result.
Signed-off-by: NNikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>

Rather than a loop reallocating space to build the regex, just allocate
it once up front, then if there's more than 1 nextent, append a comma and
another regex_unit string.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

The 'stripes' value is described as the "Number of stripes or mirrors in
a logical volume". So add "mirror" and anything that starts with "raid"
to the list of segtypes that can have an 'nextents' value greater than one.
Use of raid segtypes (raid1, raid4, raid5*, raid6*, and raid10) is favored
over mirror in more recent lvm code.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Rather than preallocating a set number of elements, then walking through
the extents and adjusting the specific element in place, use the APPEND
macros to handle that chore.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

In my previous commit a70f3b1c I've tried to fix case
when building from VPATH and a file wasn't being installed.
However, my fix broke non-VPATH build.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Ever since commit ace4aecd, running 'make check' on RHEL 6 produces:

./test-lib.sh: line 21: realpath: command not found

for every shell script test, because 'realpath' was not part of
coreutils back then.

* tests/test-lib.sh (_scriptdir): Compute with only portable shell.
Signed-off-by: NEric Blake <eblake@redhat.com>