Commit 19a148b7 dropped the cache from QEMU's private domain object.
Assume the callers do not have the cache by default and use
a longer name for the internal ones that do.

This makes the shorter 'virDomainVirtioSerialAddrAutoAssign'
name availabe for a function that will not require the cache.

Support for virtio disks was added in commit id 'fceeeda2', but not for
SCSI drives. Add the secret for the server when hotplugging a SCSI drive.
No need to make any adjustments for unplug since that's handled during
the qemuDomainDetachDiskDevice call to qemuDomainRemoveDiskDevice in
the qemuDomainDetachDeviceDiskLive switch.

Added a test to/for the command line processing to show the command line
options when adding a SCSI drive for the guest.

https://bugzilla.redhat.com/show_bug.cgi?id=1300776

Complete the implementation of support for TLS encryption on
chardev TCP transports by adding the hotplug ability of a secret
to generate the passwordid for the TLS object for chrdev, RNG,
and redirdev.

Fix up the order of object removal on failure to be the inverse
of the attempted attach (for redirdev, chr, rng) - for each the
tls object was being removed before the chardev backend.

Likewise, add the ability to hot unplug that secret object as well
and be sure the order of unplug matches that inverse order of plug.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Add the secret object so the 'passwordid=' can be added if the command line
if there's a secret defined in/on the host for TCP chardev TLS objects.

Preparation for the secret involves adding the secinfo to the char source
device prior to command line processing. There are multiple possibilities
for TCP chardev source backend usage.

Add test for at least a serial chardev as an example.

Commit id '6e6b4bfc' added the object, but forgot the other end.

Need to remove the drive first, then the secobj and/or encobj if they exist.
This is because the drive has a dependency on secobj (or the secret for
the networked storage server) and/or the encobj (or the secret for the
LUKS encrypted volume).  Deleting either object first leaves an drive
without it's respective objects.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Commit id '2c322378' added the TLS object removal to the DetachChrDevice
all when it should have been added to the RemoveChrDevice since that's
the norm for similar processing (e.g. disk)
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Add an optional "tls='yes|no'" attribute for a TCP chardev.

For QEMU, this will allow for disabling the host config setting of the
'chardev_tls' for a domain chardev channel by setting the value to "no" or
to attempt to use a host TLS environment when setting the value to "yes"
when the host config 'chardev_tls' setting is disabled, but a TLS environment
is configured via either the host config 'chardev_tls_x509_cert_dir' or
'default_tls_x509_cert_dir'
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Currently the union has only one member so remove that union.  If there
is a need to add a new type of source for new bus in the future this
will force the author to add a union and properly check bus type before
any access to union member.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Commit id '2c322378' missed the nuance that the rng backend could be
using a TCP chardev and if TLS is enabled on the host, thus will need
to have the TLS object added.

Commit id '2c322378' missed the nuance that the redirdev backend could
be using a TCP chardev and if TLS is enabled on the host, thus will need
to have the TLS object added.

It's about to get more complicated - let's alter the logic to handle
various failures. Adds saving of the error as well.

As it turns out more than one place will need these objects, so rather
than cut-copy-paste in each, make a helper

Use a pointer and the virDomainChrSourceDefNew() function in order to
allocate the structure for _virDomainRedirdevDef.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

from virDomainDefPtr to virDomainObjPtr so that the function has
access to the other parts of the virDomainObjPtr. Take advantage of
this by removing the "priv" arg and retrieving it from the
virDomainObjPtr instead.

No functional change.

Change the virDomainChrDef to use a pointer to 'source' and allocate
that pointer during virDomainChrDefNew.

This has tremendous "fallout" in the rest of the code which mainly
has to change source.$field to source->$field.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

There was inconsistency between alias used to create tls-creds-x509
object and alias used to link that object to chardev while hotpluging.
Hotplug ends with this error:

  error: Failed to detach device from channel-tcp.xml
  error: internal error: unable to execute QEMU command 'chardev-add':
  No TLS credentials with id 'objcharchannel3_tls0'

In XML we have for example alias "serial0", but on qemu command line we
generate "charserial0".

The issue was that code, that creates QMP command to hotplug chardev
devices uses only the second alias "charserial0" and that alias is also
used to link the tls-creds-x509 object.

This patch unifies the aliases for tls-creds-x509 to be always generated
from "charserial0".
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

We need to make sure that the chardev is TCP.  Without this check we
may access different part of union and corrupt pointers.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1366108

There are couple of things that needs to be done in order to
allow vhost-user hotplug. Firstly, vhost-user requires a chardev
which is connected to vhost-user bridge and through which qemu
communicates with the bridge (no acutal guest traffic is sent
through there, just some metadata). In order to generate proper
chardev alias, we must assign device alias way sooner.

Then, because we are plugging the chardev first, we need to do
the proper undo if something fails - that is remove netdev too.
We don't want anything to be left over in case attach fails at
some point.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Instead of blindly claim support for hot-plugging of every
interface type out there we should copy approach we have for
device types: white listing supported types and explicitly error
out on unsupported ones.
For instance, trying to hotplug vhostuser interface results in
nothing usable from guest currently. vhostuser typed interfaces
require additional work on our side.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

The idea is to have function that does some checking at its
beginning and then have one big switch for all the interface
types it supports.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

This function for some weird reason returns integer instead of
virDomainNetType type. It is important to return the correct type
so that we know what values we can expect.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Qemu always opens the tray if forced to. Skip the waiting step in such
case.

This also helps if qemu does not report the tray change event when
opening the cdrom forcibly (the documentation says that the event will
not be sent although qemu in fact does trigger it even if @force is
selceted).

This is a workaround for a qemu issue where qemu does not send the tray
change event in some cases (after migration with empty closed locked
drive) and thus renders the cdrom useless from libvirt's point of view.

Partially resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1368368

If the incoming XML defined a path to a TLS X.509 certificate environment,
add the necessary 'tls-creds-x509' object to the VIR_DOMAIN_CHR_TYPE_TCP
character device.

Likewise, if the environment exists the hot unplug needs adjustment as
well.  Note that all the return ret were changed to goto cleanup since
the cfg needs to be unref'd
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

The linkstate setting of an <interface> is only meant to change the
online status reported to the guest system by the emulated network
device driver in qemu, but when support for auto-creating tap devices
for <interface type='ethernet'> was added in commit 9717d6, a chunk of
code was also added to qemuDomainChangeNetLinkState() that sets the
online status of the tap device (i.e. the *host* side of the
interface) for type='ethernet'. This was never done for tap devices
used in type='bridge' or type='network' interfaces, nor was it done in
the past for tap devices created by external scripts for
type='ethernet', so we shouldn't be doing it now.

This patch removes the bit of code in qemuDomainChangeNetLinkState()
that modifies online status of the tap device.

This patch removes the old vcpu unplug code completely and replaces it
with the new code using device_del. The old hotplug code basically never
worked with any recent qemu and thus is useless.

As the new code is using device_del all the implications of using it
are present. Contrary to the device deletion code, the vcpu deletion
code fails if the unplug request is not executed in time.

Add a overlay function that takes the alias directly rather than
extracting it from a device info.

https://bugzilla.redhat.com/show_bug.cgi?id=1289391

Rather than pass the whole drive string (which contained the alias),
pass only the alias for the qemuMonitorDriveDel call in the error
path when adding a host device in the monitor fails.

When building the command line alias and for SCSI Host Device deletion,
use the common API to build the alias

Completion of fix for:
    https://bugzilla.redhat.com/show_bug.cgi?id=1336225

Similar to the other disk types, add the qemuMonitorDriveDel in the failure
to add/hotplug a SCSI disk.

Partial fix for:
    https://bugzilla.redhat.com/show_bug.cgi?id=1336225

Similar to the other disk types, add the qemuMonitorDriveDel in the failure
to add/hotplug a USB.

Added a couple of other formatting changes just to have a less cluttered look

Rather than open code build the drive alias command in multiple places,
use the helper to ensure consistency.

Since we already have a function that will generate the drivestr from
the alias, let's use it and remove the qemuDeviceDriveHostAlias.

Move the QEMU_DRIVE_HOST_PREFIX definition into qemu_alias.h

Also alter qemuAliasFromDisk to use the QEMU_DRIVE_HOST_PREFIX instead
of "drive-%s".

Modify the error/exit path to match what was done for Virtio and SCSI.
If nothing else it'll have a consistent look'n'feel

The current LUKS support has a "luks" volume type which has
a "luks" encryption format.

This partially makes sense if you consider the QEMU shorthand
syntax only requires you to specify a format=luks, and it'll
automagically uses "raw" as the next level driver. QEMU will
however let you override the "raw" with any other driver it
supports (vmdk, qcow, rbd, iscsi, etc, etc)

IOW the intention though is that the "luks" encryption format
is applied to all disk formats (whether raw, qcow2, rbd, gluster
or whatever). As such it doesn't make much sense for libvirt
to say the volume type is "luks" - we should be saying that it
is a "raw" file, but with "luks" encryption applied.

IOW, when creating a storage volume we should use this XML

  <volume>
    <name>demo.raw</name>
    <capacity>5368709120</capacity>
    <target>
      <format type='raw'/>
      <encryption format='luks'>
        <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccd2f80d6f'/>
      </encryption>
    </target>
  </volume>

and when configuring a guest disk we should use

  <disk type='file' device='disk'>
    <driver name='qemu' type='raw'/>
    <source file='/home/berrange/VirtualMachines/demo.raw'/>
    <target dev='sda' bus='scsi'/>
    <encryption format='luks'>
      <secret type='passphrase' uuid='0a81f5b2-8403-7b23-c8d6-21ccd2f80d6f'/>
    </encryption>
  </disk>

This commit thus removes the "luks" storage volume type added
in

  commit 318ebb36
  Author: John Ferlan <jferlan@redhat.com>
  Date:   Tue Jun 21 12:59:54 2016 -0400

    util: Add 'luks' to the FileTypeInfo

The storage file probing code is modified so that it can probe
the actual encryption formats explicitly, rather than merely
probing existance of encryption and letting the storage driver
guess the format.

The rest of the code is then adapted to deal with
VIR_STORAGE_FILE_RAW w/ VIR_STORAGE_ENCRYPTION_FORMAT_LUKS
instead of just VIR_STORAGE_FILE_LUKS.

The commit mentioned above was included in libvirt v2.0.0.
So when querying volume XML this will be a change in behaviour
vs the 2.0.0 release - it'll report 'raw' instead of 'luks'
for the volume format, but still report 'luks' for encryption
format.  I think this change is OK because the storage driver
did not include any support for creating volumes, nor starting
guets with luks volumes in v2.0.0 - that only since then.
Clearly if we change this we must do it before v2.1.0 though.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Dropping the caching of ccw address set.
Instead of using the cached address set, functions in qemu_hotplug.c
now recalculate it on demand.

Dropping the caching of virtio serial address set.
Instead of using the cached address set, a function in qemu_hotplug.c
now recalculates it on demand.

Credit goes to Cole Robinson.

Since return code is checked globally at the end of the function, let's
make sure that we set it correctly at any point.

This fixes a regression introduced in commit 0aa19f35 where the first
command to eject changeable media would fail unconditionally.
Signed-off-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>

USB disks, redirected devices, host devices and serial devices
are supported.