Historically QEMU/LXC guests have been placed in a cgroup layout
that is

   $LOCATION-OF-LIBVIRTD/libvirt/{qemu,lxc}/$VMNAME

This is bad for a number of reasons

 - The cgroup hierarchy gets very deep which seriously
   impacts kernel performance due to cgroups scalability
   limitations.

 - It is hard to setup cgroup policies which apply across
   services and virtual machines, since all VMs are underneath
   the libvirtd service.

To address this the default cgroup location is changed to
be

    /system/$VMNAME.{lxc,qemu}.libvirt

This puts virtual machines at the same level in the hierarchy
as system services, allowing consistent policy to be setup
across all of them.

This also honours the new resource partition location from the
XML configuration, for example

  <resource>
    <partition>/virtualmachines/production</partitions>
  </resource>

will result in the VM being placed at

    /virtualmachines/production/$VMNAME.{lxc,qemu}.libvirt

NB, with the exception of the default, /system, path which
is intended to always exist, libvirt will not attempt to
auto-create the partitions in the XML. It is the responsibility
of the admin/app to configure the partitions. Later libvirt
APIs will provide a way todo this.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Allow VMs to be placed into resource groups using the
following syntax

  <resource>
    <partition>/virtualmachines/production</partition>
  </resource>

A resource cgroup will be backed by some hypervisor specific
functionality, such as cgroups with KVM/LXC.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

A resource partition is an absolute cgroup path, ignoring the
current process placement. Expose a virCgroupNewPartition API
for constructing such cgroups
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Currently if virCgroupMakeGroup fails, we can get in a situation
where some controllers have been setup, but others not. Ensure
we call virCgroupRemove to remove what we've done upon failure
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Currently the virCgroupPtr struct contains 3 pieces of
information

 - path - path of the cgroup, relative to current process'
   cgroup placement
 - placement - current process' placement in each controller
 - mounts - mount point of each controller

When reading/writing cgroup settings, the path & placement
strings are combined to form the file path. This approach
only works if we assume all cgroups will be relative to
the current process' cgroup placement.

To allow support for managing cgroups at any place in the
heirarchy a change is needed. The 'placement' data should
reflect the absolute path to the cgroup, and the 'path'
value should no longer be used to form the paths to the
cgroup attribute files.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Some aspects of the cgroups setup / detection code are quite subtle
and easy to break. It would greatly benefit from unit testing, but
this is difficult because the test suite won't have privileges to
play around with cgroups. The solution is to use monkey patching
via LD_PRELOAD to override the fopen, open, mkdir, access functions
to redirect access of cgroups files to some magic stubs in the
test suite.

Using this we provide custom content for the /proc/cgroup and
/proc/self/mounts files which report a fixed cgroup setup. We
then override open/mkdir/access so that access to the cgroups
filesystem gets redirected into files in a temporary directory
tree in the test suite build dir.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Rename all the virCgroupForXXX methods to use the form
virCgroupNewXXX since they are all constructors. Also
make sure the output parameter is the last one in the
list, and annotate all pointers as non-null. Fix up
all callers, and make sure they use true/false not 0/1
for the boolean parameters
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The definition of structs for cgroups are kept in vircgroup.c since
they are intended to be private from users of the API. To enable
effective testing, however, they need to be accessible. To address
the latter issue, without compronmising the former, this introduces
a new vircgrouppriv.h file to hold the struct definitions.

To prevent other files including this private header, it requires
that __VIR_CGROUP_ALLOW_INCLUDE_PRIV_H__ be defined before inclusion
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of calling virCgroupForDomain every time we need
the virCgrouPtr instance, just do it once at Vm startup
and cache a reference to the object in virLXCDomainObjPrivatePtr
until shutdown of the VM. Removing the virCgroupPtr from
the LXC driver state also means we don't have stale mount
info, if someone mounts the cgroups filesystem after libvirtd
has been started
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of calling virCgroupForDomain every time we need
the virCgrouPtr instance, just do it once at Vm startup
and cache a reference to the object in qemuDomainObjPrivatePtr
until shutdown of the VM. Removing the virCgroupPtr from
the QEMU driver state also means we don't have stale mount
info, if someone mounts the cgroups filesystem after libvirtd
has been started
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virCgroupForDriver method recently gained an 'int controllers'
parameter, but the stub impl did not
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Introduce a method virFileDeleteTree for recursively deleting
an entire directory tree
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Only compile storagevolxml2argvtest if WITH_STORAGE is
set, because it links to that driver
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

On Win32 symlink() is not available, so virstoragetest.c
must be conditionalized to avoid compile failures.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The second param of virNetlinkCommand should be
struct nlmsghdr, not unsigned char.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Win32 does not like undefined symbols, so define an
empty virThreadCancel impl.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

On win32, all code is position independent and adding -fPIE
to the compiler flags results in warnings being printed
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Upstream gnulib determined that we were needlessly compiling in
gnulib's regex instead of glibc's when targetting new-enough glibc,
because the m4 test was being too strict in requiring a particular
answer to undefined behavior.
https://lists.gnu.org/archive/html/bug-gnulib/2013-04/msg00032.html

* .gnulib: Update to latest, for regex.

Though they are the same thing, mixed use of them is uncomfortable.
"unsigned" is used a lot in old codes, this just tries to change the
ones in utils.

If libvirt makes any gcry_control() calls, then this
prevents gnutls for doing any initialization. As such
we must take care to do full initialization of libcrypt
on a par with what gnutls would have done. In particular
we must disable "sec mem" for cases where the user does
not have mlock() permission. We also skip our init of
libgcrypt if something else (ie the app using libvirt)
has beaten us to it.

https://bugzilla.redhat.com/show_bug.cgi?id=951630Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Report the errors as:
Domain not found: no domain with matching uuid '41414141-4141-4141-4141-414141414141' (crashtest)
instead of:
Domain not found: no domain with matching uuid '41414141-4141-4141-4141-414141414141'

Use the helper to lookup the domain object in the remaining places.

This patch also fixes error reporting when the domain was not found in several
functions that were printing the raw UUID buffer instead of the formatted
string. The offending functions were:

qemuDomainGetInterfaceParameters
qemuDomainSetInterfaceParameters
qemuGetSchedulerParametersFlags
qemuSetSchedulerParametersFlags
qemuDomainGetNumaParameters
qemuDomainSetNumaParameters
qemuDomainGetMemoryParameters
qemuDomainSetMemoryParameters
qemuDomainGetBlkioParameters
qemuDomainSetBlkioParameters
qemuDomainGetCPUStats

Pushed under trivial rule

Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

For TPM passthrough device support create command line parameters like:

-tpmdev passthrough,id=tpm-tpm0,path=/dev/tpm0,cancel-path=/sys/class/misc/tpm0/device/cancel -device tpm-tis,tpmdev=tpm-tpm0,id=tpm0
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Some refactoring for virDomainChrSourceDef type of devices so
we can use common code.
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

When a VM with a TPM passthrough device is started, the audit daemon
logs the following type of message:

type=VIRT_RESOURCE msg=audit(1365170222.460:3378): pid=16382 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:virtd_t:s0-s0:c0.c1023 msg='virt=kvm resrc=dev reason=start vm="TPM-PT" uuid=a4d7cd22-da89-3094-6212-079a48a309a1 device="/dev/tpm0" exe="/usr/sbin/libvirtd" hostname=? addr=? terminal=? res=success'
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Parse the domain XML with TPM passthrough support.
The TPM passthrough XML may look like this:

    <tpm model='tpm-tis'>
      <backend type='passthrough'>
        <device path='/dev/tpm0'/>
      </backend>
    </tpm>
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Implement helper function to create the TPM's sysfs cancel file.
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Supported TPM passthrough XML may look as follows:

    <tpm model='tpm-tis'>
      <backend type='passthrough'>
        <device path='/dev/tpm0'/>
      </backend>
    </tpm>
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

Probe for QEMU's QMP TPM support by querying the lists of
supported TPM models (query-tpm-models) and backend types
(query-tpm-types). 

The setting of the capability flags following the strings
returned from the commands above is only provided in the
patch where domain_conf.c gets TPM support due to dependencies
on functions only introduced there. 
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>
Tested-by: NCorey Bryant <coreyb@linux.vnet.ibm.com>

This patch adds the ability to configure non-contiguous boot orders on boot
devices. This allows unplugging devices that have boot order specified without
breaking migration.

The new code now uses a slightly less memory efficient approach to store the
boot order fields in a hashtable instead of a bitmap.