Provide integration with libvirt's lock manager in the libxl driver.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

This needs to specified in way too many places for a simple validation
check. The ostype/arch/virttype validation checks later in
DomainDefParseXML should catch most of the cases that this was covering.

A destroy operation can take considerable time on large memory
domains due to scrubbing the domain's memory.  Unlock the
virDomainObj while libxl_domain_destroy is executing.

Implement libxlDomainDestroyInternal wrapper to handle unlocking,
calling destroy, and locking.  Change all callers of
libxl_domain_destroy to use the wrapper.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

A job should be acquired at the beginning of a domain destroy operation,
not at the end when cleaning up the domain.  Fix two occurrences of this
late job acquisition in the libxl driver.  Doing so renders
libxlDomainCleanupJob unused, so it is removed.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Let callers of libxlDomainStart decide when it is appropriate to
acquire a job on the associated virDomainObj.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Recent testing on large memory systems revealed a bug in the Xen xl
tool's freemem() function.  When autoballooning is enabled, freemem()
is used to ensure enough memory is available to start a domain,
ballooning dom0 if necessary.  When ballooning large amounts of memory
from dom0, freemem() would exceed its self-imposed wait time and
return an error.  Meanwhile, dom0 continued to balloon.  Starting the
domain later, after sufficient memory was ballooned from dom0, would
succeed.  The libvirt implementation in libxlDomainFreeMem() suffers
the same bug since it is modeled after freemem().

In the end, the best place to fix the bug on the Xen side was to
slightly change the behavior of libxl_wait_for_memory_target().
Instead of failing after caller-provided wait_sec, the function now
blocks as long as dom0 memory ballooning is progressing.  It will return
failure only when more memory is needed to reach the target and wait_sec
have expired with no progress being made.  See xen.git commit fd3aa246.
There was a dicussion on how this would affect other libxl apps like
libvirt

http://lists.xen.org/archives/html/xen-devel/2015-03/msg00739.html

If libvirt containing this patch was build against a Xen containing
the old libxl_wait_for_memory_target() behavior, libxlDomainFreeMem()
will fail after 30 sec and domain creation will be terminated.
Without this patch and with old libxl_wait_for_memory_target() behavior,
libxlDomainFreeMem() does not succeed after 30 sec, but returns success
anyway.  Domain creation continues resulting in all sorts of fun stuff
like cpu soft lockups in the guest OS.  It was decided to properly fix
libxl_wait_for_memory_target(), and if anything improve the default
behavior of apps using the freemem reference impl in xl.

xl was patched to accommodate the change in libxl_wait_for_memory_target()
with xen.git commit 883b30a0.  This patch does the same in the libxl
driver.  While at it, I changed the logic to essentially match
freemem() in $xensrc/tools/libxl/xl_cmdimpl.c.  It was a bit cleaner
IMO and will make it easier to spot future, potentially interesting
divergences.

If we fail to create the thread we leak the shutdown_info
structure.
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Although needed in the Xen 4.1 libxl days, there is no longer any
benefit to having per-domain libxl_ctx.  On the contrary, their use
makes the code unecessarily complicated and prone to deadlocks under
load.  As suggested by the libxl maintainers, use a single libxl_ctx
as a handle to libxl instead of per-domain ctx's.

One downside to using a single libxl_ctx is there are no longer
per-domain log files for log messages emitted by libxl.  Messages
for all domains will be sent to /var/log/libvirt/libxl/libxl-driver.log.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

libxlDomainFreeMem() is only used in libxl_domain.c and thus should
be declared static.  While at it, change the signature to take a
libxl_ctx instead of libxlDomainObjPrivatePtr, since only the
libxl_ctx is needed.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

This function now only enables domain death events.  Simply call
libxl_evenable_domain_death() instead of an unnecessary wrapper.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Change the domain event handler code to use the driver-wide
libxl_ctx instead of the domain-specific one.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Register a domain event handler with the driver-wide libxl_ctx
during driver initialization.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Informing libxl how to handle its child proceses should be done once
during driver initialization, not once for each domain-specific
libxl_ctx object.  The related libxl documentation in
$xen-src/tools/libxl/libxl_event.h even mentions that "it is best to
call this at initialisation".
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Long ago I incorrectly associated libxl fd and timer registrations
with per-domain libxl_ctx objects.  When creating a libxlDomainObjPrivate,
a libxl_ctx is allocated, and libxl_osevent_register_hooks is called
passing a pointer to the libxlDomainObjPrivate.  When an fd or timer
registration occurred, the registration callback received the
libxlDomainObjPrivate, containing the per-domain libxl_ctx.  This
libxl_ctx was then used when informing libxl about fd events or
timer expirations.

The problem with this approach is that fd and timer registrations do not
share the same lifespan as libxlDomainObjPrivate, and hence the per-domain
libxl_ctx ojects.  The result is races between per-domain libxl_ctx's being
destoryed and events firing on associated fds/timers, typically manifesting
as an assert in libxl

libxl_internal.h:2788: libxl__ctx_unlock: Assertion `!r' failed

There is no need to associate libxlDomainObjPrivate objects with libxl's
desire to use libvirt's event loop.  Instead, the driver-wide libxl_ctx can
be used for the fd and timer registrations.

This patch moves the fd and timer handling code away from the
domain-specific code in libxl_domain.c into libxl_driver.c.  While at it,
function names were changed a bit to better describe their purpose.

The unnecessary locking was also removed since the code simply provides a
wrapper over the event loop interface.  Indeed the locks may have been
causing some deadlocks when repeatedly creating/destroying muliple domains.
There have also been rumors about such deadlocks during parallel OpenStack
Tempest runs.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

This patch adds code that parses and formats configuration for memory
devices.

A simple configuration would be:
<memory model='dimm'>
  <target>
    <size unit='KiB'>524287</size>
    <node>0</node>
  </target>
</memory>

A complete configuration of a memory device:
<memory model='dimm'>
  <source>
    <pagesize unit='KiB'>4096</pagesize>
    <nodemask>1-3</nodemask>
  </source>
  <target>
    <size unit='KiB'>524287</size>
    <node>1</node>
  </target>
</memory>

This patch preemptively forbids use of the <memory> device in individual
drivers so the users are warned right away that the device is not
supported.

Add a XML element that will allow to specify maximum supportable memory
and the count of memory slots to use with memory hotplug.

To avoid possible confusion and misuse of the new element this patch
also explicitly forbids the use of the maxMemory setting in individual
drivers's post parse callbacks. This limitation will be lifted when the
support is implemented.

With the current control flow the post parse callback returned success
right away for fully virtualized VMs. To allow adding additional checks
into the post parse callback tweak the conditions so that the function
doesn't return early except for error cases.

To clarify the original piece of code borrow the wording from the commit
message for the patch that introduced the code.

Since we're not specifically a vcpu related structure anymore...

A helper that never returns an error and treats bits out of bitmap range
as false.

Use it everywhere we use ignore_value on virBitmapGetBit, or loop over
the bitmap size.

Instead of using the libxl_ctx in the libxlDomainObjPrivatePtr,
use the ctx passed to the callback.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Domain death watch is already disabled in libxlDomainCleanup.  No
need to disable it a second and third time.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

Periodically my Coverity scan will return a checked_return failure
for libxlDomainShutdownThread call to libxlDomainStart. Followed the
libxlAutostartDomain example in order to check the status, emit a
message, and continue on.

Do not silently ignore its value. LibXL support only one address, so
refuse multiple IPs.
Signed-off-by: NMarek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

The path to the pty of a Xen PV console is set only in
virDomainOpenConsole. But this is done too late. A call to
virDomainGetXMLDesc done before OpenConsole will not have the path to
the pty, but a call after OpenConsole will.

e.g. of the current issue.
Starting a domain with '<console type="pty"/>'
Then:
virDomainGetXMLDesc():
  <devices>
    <console type='pty'>
      <target type='xen' port='0'/>
    </console>
  </devices>
virDomainOpenConsole()
virDomainGetXMLDesc():
  <devices>
    <console type='pty' tty='/dev/pts/30'>
      <source path='/dev/pts/30'/>
      <target type='xen' port='0'/>
    </console>
  </devices>

The patch intend to have the TTY path on the first call of GetXMLDesc.
This is done by setting up the path at domain start up instead of in
OpenConsole.

https://bugzilla.redhat.com/show_bug.cgi?id=1170743Signed-off-by: NAnthony PERARD <anthony.perard@citrix.com>

The virDomainDefParse* and virDomainDefFormat* methods both
accept the VIR_DOMAIN_XML_* flags defined in the public API,
along with a set of other VIR_DOMAIN_XML_INTERNAL_* flags
defined in domain_conf.c.

This is seriously confusing & error prone for a number of
reasons:

 - VIR_DOMAIN_XML_SECURE, VIR_DOMAIN_XML_MIGRATABLE and
   VIR_DOMAIN_XML_UPDATE_CPU are only relevant for the
   formatting operation
 - Some of the VIR_DOMAIN_XML_INTERNAL_* flags only apply
   to parse or to format, but not both.

This patch cleanly separates out the flags. There are two
distint VIR_DOMAIN_DEF_PARSE_* and VIR_DOMAIN_DEF_FORMAT_*
flags that are used by the corresponding methods. The
VIR_DOMAIN_XML_* flags received via public API calls must
be converted to the VIR_DOMAIN_DEF_FORMAT_* flags where
needed.

The various calls to virDomainDefParse which hardcoded the
use of the VIR_DOMAIN_XML_INACTIVE flag change to use the
VIR_DOMAIN_DEF_PARSE_INACTIVE flag.

Add missing 'break's from commit 1298daca, as noted by John Ferlan

https://www.redhat.com/archives/libvir-list/2014-October/msg00430.html

This started as an investigation into an issue where libvirt (using the
libxl driver) and the Xen host, like an old couple, could not agree on
who is responsible for selecting the VNC port to use.

Things usually (and a bit surprisingly) did work because, just like that
old couple, they had the same idea on what to do by default. However it
was possible that this ended up in a big argument.

The problem is that display information exists in two different places:
in the vfbs list and in the build info. And for launching the device model,
only the latter is used. But that never gets initialized from libvirt. So
Xen allows the device model to select a default port while libvirt thinks
it has told Xen that this is done by libvirt (though the vfbs config).

While fixing that, I made a stab at actually evaluating the configuration
of the video device. So that it is now possible to at least decide between
a Cirrus or standard VGA emulation and to modify the VRAM within certain
limits using libvirt.
Signed-off-by: NStefan Bader <stefan.bader@canonical.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

On the error path need to free the chrdef

Create a separate typedef for the hostdev union data describing PCI.
Then adjust the code to use the new pointer

Add code to support attach/detaching a network device.
Signed-off-by: NChunyan Liu <cyliu@suse.com>

Xen PV domains always have a PV console, so add one to the domain
config via post-parse callback if not explicitly specified in
the XML.  The legacy Xen driver behaves similarly, causing a
regression when switching to the new Xen toolstack.  I.e.

  virsh console pv-domain

will no longer work after upgrading a xm/xend stack to xl/libxl.

Currently, only LXC has hostdev mode 'capabilities' support,
so the other drivers should forbid to define it in XML.
The hostdev mode check is added to devicesPostParseCallback()
for each hypervisor driver.

But there are some drivers lack function devicesPostParseCallback(),
so only add check for qemu, libxl, openvz, uml, xen, xenapi.
Signed-off-by: NJincheng Miao <jmiao@redhat.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>

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 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>

In "src/conf/domain_conf.h" there are many enum declarations. The
cleanup in this header filer was started, but it wasn't enough and
there are many other files that has enum variables declared. So, the
commit was starting to be big. This commit finish the cleanup in this
header file and in other files that has enum variables, parameters,
or functions declared.
Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
Signed-off-by: NEric Blake <eblake@redhat.com>

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