In cases when -blockdev is used we need to use 'query-named-block-nodes'
instead of 'query-block'. This means that we can extract the
write-threshold variable right away.

To keep compatibility with old VMs modify the code which was extracting
the value previously so that it updates the stats structure and a single
code path then can be used to extract the data.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Allow reuse of qemuDomainGetStatsOneBlock to work with nodenames by
removing the code that looks up the stats data to the caller.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Disk image size data are not contained in the reply of query-blockstats
but need to be gathered from query-block. For use with -blockdev we
really need to call 'query-named-block-nodes' and process it to retrieve
the correct data.

This patch introduces qemuMonitorBlockStatsUpdateCapacityBlockdev which
updates the capacity data by nodename rather than device name.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

For use with -blockdev we need to be able to retrieve the stats by
'qdev' for the frontend device stats since 'device' will be empty. Note
that for non-blockdev case qdev and 'device' with 'drive-' skipped would
be the same.

Additionally so that we can report the highest written offset we need to
also be able to access them by node-name for backing chain purposes.

In cases when 'device' is empty it does not make sense to gather them.

Allow arranging the stats simultaneously in all the above dimensions.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Rather than totalling every entry from 'query-block' for stats provided
by qemuDomainBlocksStatsGather total only stats for known disks. This
will allow to return data for nodenames and qdevs in the same hash so
that we can use them with -blockdev.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The string is not modified so it does not make sense to have a copy.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Use the new APIs which allow to manipulate the tray and media separately
and also allow using a nodename to refer to a media to implement media
changing.

With the new approach we don't have to call eject twice as the media is
removed by calling qemuMonitorBlockdevMediumRemove.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

With blockdev we can use the full range of commands to manipulate the
tray and the medium separately. Implement monitor code for this.

Schema testing done in the qemumonitorjsontest allows us to verify that
we generate the commands correctly.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Initialize data for the whole backing chain when plugging in or removing
disks when a machine supports -blockdev.

Similarly to startup we need to prepare the structures for the whole
backing chain and take care of the copy-on-read feature.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Use the 'node-name' provided in the event if 'device' is empty to look
up the disk.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add handling of the 'id' field in the event which corresponds to the
QDEV id of the device.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Allow looking up also via QOM id and rename the function accordingly.
Also add documentation of the specifics.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Use the nodename to resize the device rather than the drive alias.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

With -blockdev the drive alias can't be used any more so we need to
switch to the QOM name.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The proper way to do this would be to use the 'throttle' driver but
unfortunately it can't change the 'throttle_group' so we can't provide
feature parity. This hack uses the block_set_io_throttle command to do
so until we can properly replace it.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add a helper which will use a collection of other helpers to determine
whether a disk requires throttling to be enabled.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Format the backing chain onto the commandline using the 'json' syntax
with -blockdev.

The command line formatter needs only minor tweaks to add the new
entries but we now need to initialize the structures that are used for
every layer of the backing chain.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Pass in the node name as the backend alias when -blockdev is used. As
copy-on-read is expressed by a separate -blockdev backing chain member
we need to decide which node name to use here.

For empty cdroms when using -blockdev there is no backend at all so NULL
is returned.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The copy on read functionality is done using a separate layer in the
backing chain. Add function to generate properties for it.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Prepare the full backing chain by instantiating authentication and TLS
transport secrets and other necessary objects so that we can add the
full backing chain explicitly to qemu. This also includes allocation of
nodenames for the individual backing chain members.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The copy-on-read feature is expressed by adding a new node layer in
qemu when using -blockdev. Since we will keep these per-disk (as opposed
to per storage source) we need to store the appropriate node names in
the disk definition.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

To allow referring to the drives via the QOM id we need to setup the
floppy drives with a proper ID. This means that -device should be used
for them.

There are the following quirks:
- FDC needs to be instantiated prior to any floppy device
- floppy drive specified via -device does not support 'bootindex'
    (hacked around by passing bootindexA=1 to the FDC)
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When we stop using -drive qemu stops reporting it in some of the monitor
commands. To allow referring the disk frontends and the corresponding
block backends we need to know these names. Unfortunately different
buses require different names.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When using -blockdev you need to use the qom path to refer to the disk
fronends. Add means for storing the path and getting it after restart.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Use the index stored in virStorageSource struct rather than
recalculating it. Currently we'd report proper numbers but that will
change with blockdev.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Similarly to backing store indexes which will become stable eventually
we need also to be able to format and store in the status XML for later
use the index for the top level of the backing chain.

Add XML formatter, parser, schema and docs.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Allow storing of private data in the status XML for disks.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Node names for block objects in qemu need to be unique for an instance
of the qemu process. Add a counter to generate objects sequentially and
store it in the status XML so that we can restore it.

The helpers added allow to create new node names and reset the counter
after the VM process terminates.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

If a user configures the backing chain in the XML we should not ignore
it. We already do parse it but don't format it out. As a
safety-precaution don't attempt to format detected chain into the
inactive XML.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

We'll specify them ourselves so it's pointless to attempt to redetect
them.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

We need to load the backing chain from the XML when using -blockdev.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

SD cards are currently passed by using -drive only which would not be
compatible with using -blockdev fully.

Clear QEMU_CAPS_BLOCKDEV if the VM has such devices.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The capability currently is not enabled so that we can add individual
bits first.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Print the values so it's simpler to debug.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

It should be impossible to lack an alias in the domain definition. Other
disk types don't generate it so remove it here as well.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add test data for nested backing chains with/without indexes (used in
status XMLs) which will excercise blockdev and the related work.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The blockdev support will change existing approach to add disks to VMs
so all tests using the DO_TEST_CAPS_LATEST approach which have any disks
need to be forked so that the changes can be applied.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The disk is not necessary to test the mdevs.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Allow referring to individual node name to resize.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The 'device' field reported by 'query-block' is empty when -blockdev is
used. Add an argument which will allow matching disk by using the qdev
id so we can use this code with -blockdev.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>