Now that qemuMonitorGetAllBlockStatsInfo collects also wr_highest_offset
the whole function can be killed.

Instead of using qemuMonitorJSONDevGetBlockExtent (which I plan to
remove later) extract the data in place.

Additionally add a flag that will be set when the wr_highest_offset was
extracted correctly so that callers can act according to that.

The test case addition should help make sure that everything works.

QEMU_CAPS_SEAMLESS_MIGRATION capability says QEMU supports
SPICE_MIGRATE_COMPLETED event. Thus we can just drop all code which
polls query-spice and replace it with waiting for the event.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

"query-block-jobs" QMP command returns all running block jobs at once,
while qemuMonitorBlockJobInfo would only report one. This is not very
nice in case we need to check several block jobs. This patch refactors
the monitor code to always parse all block jobs and store them in a
hash.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

It would be used in qemumonitorjsontest, thus we make it non-static.
Signed-off-by: NZhang Bo <oscar.zhangbo@huawei.com>
Signed-off-by: NZhou Yimin <zhouyimin@huawei.com>

Replace with just VIR_FREE.

Rather than have a separate routine to parse the alias of an iothread
returned from qemu in order to get the iothread_id value, parse the alias
when returning and just return the iothread_id in qemuMonitorIOThreadInfoPtr

This set of patches removes the function, changes the "char *name" to
"unsigned int" and handles all the fallout.

Among all the monitor APIs some where checking if mon is NULL and some
were not. Since it's possible to have mon equal to NULL in case a second
call is attempted once entered the monitor. This requires that every
single API checks for the monitor.

This patch adds a macro that helps checking the state of the monitor and
either refactors existing checking code to use the macro or adds it in
case it was missing.

Add the attribute and remove the check.

Since it now handles only block pull code paths we can refactor it and
remove tons of cruft.

Sacrifice a few lines of code in favor of the code being more readable.

qemuDomainBlockJobImpl become an unmaintainable mess over the years of
adding new stuff to it. This patch starts splitting up individual
functions from it until it can be killed entirely.

In bulk this will add lines of code rather than delete them but it will
be traded for maintainability.

There are two leftover unused variables. Remove them and clean up the
fallout of the change.

It only deals with a single thread.

When using 'dimm' memory devices with qemu, some of the information
like the slot number and base address need to be reloaded from qemu
after process start so that it reflects the actual state. The state then
allows to use memory devices across migrations.

In qemu 2.3, the migration status will include 'cancelling' in the
window between when an asynchronous cancel has been requested and
when the migration is actually halted.  Previously, qemu hid this
state and reported 'active'.  Libvirt manages the sequence okay
even when the string is unrecognized (that is, it will report an
unknown state:

Migration: [ 69 %]^Cerror: internal error: unexpected migration status in cancelling.

but the migration is still cancelled), but recognizing the string
makes for a smoother user experience.

* src/qemu/qemu_monitor.h
(QEMU_MONITOR_MIGRATION_STATUS_CANCELLING): Add enum.
* src/qemu/qemu_monitor.c (qemuMonitorMigrationStatus): Map it.
* src/qemu/qemu_migration.c (qemuMigrationUpdateJobStatus): Adjust
clients.
* src/qemu/qemu_monitor_json.c
(qemuMonitorJSONGetMigrationStatusReply): Likewise.
Signed-off-by: NEric Blake <eblake@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1199182 documents that
after a series of disk snapshots into existing destination images,
followed by active commits of the top image, it is possible for
qemu 2.2 and earlier to end up tracking a different name for the
image than what it would have had when opening the chain afresh.
That is, when starting with the chain 'a <- b <- c', the name
associated with 'b' is how it was spelled in the metadata of 'c',
but when starting with 'a', taking two snapshots into 'a <- b <- c',
then committing 'c' back into 'b', the name associated with 'b' is
now the name used when taking the first snapshot.

Sadly, older qemu doesn't know how to treat different spellings of
the same filename as identical files (it uses strcmp() instead of
checking for the same inode), which means libvirt's attempt to
commit an image using solely the names learned from qcow2 metadata
fails with a cryptic:

error: internal error: unable to execute QEMU command 'block-commit': Top image file /tmp/images/c/../b/b not found

even though the file exists.  Trying to teach libvirt the rules on
which name qemu will expect is not worth the effort (besides, we'd
have to remember it across libvirtd restarts, and track whether a
file was opened via metadata or via snapshot creation for a given
qemu process); it is easier to just always directly ask qemu what
string it expects to see in the first place.

As a safety valve, we validate that any name returned by qemu
still maps to the same local file as we have tracked it, so that
a compromised qemu cannot accidentally cause us to act on an
incorrect file.

* src/qemu/qemu_monitor.h (qemuMonitorDiskNameLookup): New
prototype.
* src/qemu/qemu_monitor_json.h (qemuMonitorJSONDiskNameLookup):
Likewise.
* src/qemu/qemu_monitor.c (qemuMonitorDiskNameLookup): New function.
* src/qemu/qemu_monitor_json.c (qemuMonitorJSONDiskNameLookup)
(qemuMonitorJSONDiskNameLookupOne): Likewise.
* src/qemu/qemu_driver.c (qemuDomainBlockCommit)
(qemuDomainBlockJobImpl): Use it.
Signed-off-by: NEric Blake <eblake@redhat.com>

The functions and their QMP and HMP implementations are no longer needed
since everything is now done via the *AllStats functions.

The error count statistic is not supported by qemu, so there's no need
to pass the variables around if the result is ignored anyways.

QEMU internally updates the size of video memory if the domain XML had
provided too low memory size or there are some dependencies for a QXL
devices 'vgamem' and 'ram' size. We need to know about the changes and
store them into the status XML to not break migration or managedsave
through different libvirt versions.

The values would be loaded only if the "vgamem_mb" property exists for
the device.  The presence of the "vgamem_mb" also tells that the
"ram_size" and "vram_size" exists for QXL devices.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

A future patch will allow recursion into backing chains when
collecting block stats.  This patch should not change behavior,
but merely moves out the common code that will be reused once
recursion is enabled, and adds the parameter that will turn on
recursion.

* src/qemu/qemu_monitor.h (qemuMonitorGetAllBlockStatsInfo)
(qemuMonitorBlockStatsUpdateCapacity): Add recursion parameter,
although it is ignored for now.
* src/qemu/qemu_monitor.h (qemuMonitorGetAllBlockStatsInfo)
(qemuMonitorBlockStatsUpdateCapacity): Likewise.
* src/qemu/qemu_monitor_json.h
(qemuMonitorJSONGetAllBlockStatsInfo)
(qemuMonitorJSONBlockStatsUpdateCapacity): Likewise.
* src/qemu/qemu_monitor_json.c
(qemuMonitorJSONGetAllBlockStatsInfo)
(qemuMonitorJSONBlockStatsUpdateCapacity): Add parameter, and
split...
(qemuMonitorJSONGetOneBlockStatsInfo)
(qemuMonitorJSONBlockStatsUpdateCapacityOne): ...into helpers.
(qemuMonitorJSONGetBlockStatsInfo): Update caller.
* src/qemu/qemu_driver.c (qemuDomainGetStatsBlock): Update caller.
* src/qemu/qemu_migration.c (qemuMigrationCookieAddNBD): Likewise.
Signed-off-by: NEric Blake <eblake@redhat.com>

Improve the monitor function to also retrieve the guest state of
character device (if provided) so that we can refresh the state of
virtio-serial channels and perhaps react to changes in the state in
future patches.

This patch changes the returned data from qemuMonitorGetChardevInfo to
return a structure containing the pty path and the state for all the
character devices.

The change to the testsuite makes sure that the data is parsed
correctly.

New qemu added a new event that is emitted when a virtio serial channel
is opened in the guest OS. This allows us to update the state of the
port in the output-only XML element.

This patch implements the monitor callbacks and necessary handlers to
update the state in the definition.

To unify future additions that require information from "query-chardev"
rename qemuMonitorGetPtyPaths and friends to qemuMonitorGetChardevInfo
and move the allocation of the returned hash into the top level
function.

We used to set migration capabilities only when a user asked for them in
flags. This is fine when migration succeeds since the QEMU process is
killed in the end but in case migration fails or if it's cancelled, some
capabilities may remain turned on with no way to turn them off. To fix
that, migration capabilities have to be turned on if requested but
explicitly turned off in case they were not requested but QEMU supports
them.

https://bugzilla.redhat.com/show_bug.cgi?id=1163953Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Add support for bps_max and friends in the driver part.
In the part checking if a qemu is running, check if the running binary
support bps_max, if not print an error message, if yes add it to
"info" variable
Signed-off-by: NMatthias Gatto <matthias.gatto@outscale.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

To allow live modification of device backends in qemu libvirt needs to
be able to hot-add/remove "objects". Add monitor backend functions to
allow this.

This function will be used for hot-add/remove of RNG backends,
IOThreads, memory backing objects, etc.

NIC_RX_FILTER_CHANGED is sent by qemu any time a NIC driver in the
guest modified the NIC's RX Filter (for example, if the MAC address of
the NIC is changed by the guest).

This patch doesn't do anything useful with that event; it just sets up
all the plumbing to get news of the event into a worker thread with
all proper locking/reference counting, and provide an easy place to
add in desired functionality.

See src/qemu/EVENTHANDLERS.txt for information/instructions on adding
a libvirt-internal handler for a qemu event (using
NIC_RX_FILTER_CHANGED as an example).

This function can be called at any time to get the current status of a
guest's network device rx-filter. In particular it is useful to call
after libvirt recieves a NIC_RX_FILTER_CHANGED event - this event only
tells you that something has changed in the rx-filter, the details are
retrieved with the query-rx-filter monitor command (only available in
the json monitor). The command sent to the qemu monitor looks like this:

  {"execute":"query-rx-filter", "arguments": {"name":"net2"} }'

and the results will look something like this:

{
    "return": [
        {
            "promiscuous": false,
            "name": "net2",
            "main-mac": "52:54:00:98:2d:e3",
            "unicast": "normal",
            "vlan": "normal",
            "vlan-table": [
                42,
                0
            ],
            "unicast-table": [

            ],
            "multicast": "normal",
            "multicast-overflow": false,
            "unicast-overflow": false,
            "multicast-table": [
                "33:33:ff:98:2d:e3",
                "01:80:c2:00:00:21",
                "01:00:5e:00:00:fb",
                "33:33:ff:98:2d:e2",
                "01:00:5e:00:00:01",
                "33:33:00:00:00:01"
            ],
            "broadcast-allowed": false
        }
    ],
    "id": "libvirt-14"
}

This is all parsed from JSON into a virNetDevRxFilter object for
easier consumption. (unicast-table is usually empty, but is also an
array of mac addresses similar to multicast-table).

(NB: LIBNL_CFLAGS was added to tests/Makefile.am because virnetdev.h
now includes util/virnetlink.h, which includes netlink/msg.h when
appropriate. Without LIBNL_CFLAGS, gcc can't find that file (if
libnl/netlink isn't available, LIBNL_CFLAGS will be empty and
virnetlink.h won't try to include netlink/msg.h anyway).)

and tweak the code to avoid using it.

Management software wants to be able to allocate disk space on demand.
To support this they need keep track of the space occupation of the
block device.  This information is reported by qemu as part of block
stats.

This patch extend the block information in the bulk stats with the
allocation information.

To keep the same behaviour a helper is extracted from
qemuMonitorJSONGetBlockExtent in order to get per-device allocation
information.
Signed-off-by: NFrancesco Romani <fromani@redhat.com>
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

While our code gathers block stats via "query-blockstats" some
information need to be gathered via "query-block". Add a helper function
that will update the blockstats structure if requested.

The current block stats code matched up the disk name with the actual
stats by the order in the data returned from qemu. This unfortunately
isn't right as qemu may return the disks in any order. Fix this by
returning a hash of stats and index them by the disk alias.

Currently we only support TCP protocol for native QEMU migration but
this is going to be changed. Let's make the code more general and remove
hardcoded TCP protocol from several places.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

RDMA migration uses the 'setup' state in QEMU to optionally lock
all memory before the migration starts. The total time spent in
this state is exposed as VIR_DOMAIN_JOB_SETUP_TIME.

Additionally, QEMU also exports migration throughput (mbps) for both
memory and disk, so let's add them too: VIR_DOMAIN_JOB_MEMORY_BPS,
VIR_DOMAIN_JOB_DISK_BPS.
Signed-off-by: NMichael R. Hines <mrhines@us.ibm.com>
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

This patch implements the VIR_DOMAIN_STATS_BLOCK group of statistics.

To do so, a helper function to get the block stats of all the disks of
a domain is added.
Signed-off-by: NFrancesco Romani <fromani@redhat.com>
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>