The disk storage source needs to be prepared if we want to use -blockdev
or secrets for the new media image. It does not hurt to do the same for
the legacy hotplug code as well.
Unfortunately helpers like qemuDomainPrepareDiskSource take
virDomainDiskDef as an argument and it would be hard to fix them to take
an explicit source, so the function also temporarily replaces disk->src
for the new source in this function.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Some functions require us to replace disk->src with the new source for
them to work properly. To avoid confusion all places which allow
explicit virStorageSource should get the appropriate definition.
The legacy code fortunately does not need anything from the old source
so that does not require modifications.
Blockdev does require the old definition so we'll pass it explicitly.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Since the code is also used when changing media we need to allow
specifying explicit source for which we are going to prepare. With this
change callers don't have to replace disk->src with the new source
definition for generating these.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
qemu media changing code tried to assume old media's format for the new
one if that was not specified. Since the format will always be present
it does not make sense to keep the code around.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Old media changing code does not bother setting up the secrets for new
media or actually removing/adding of the corresponding objects.
Additionally it uses secrets setup for the old image to be removed as
the secret for the new image which is wrong.
Remove the support for secrets while changing media for the legacy
approach. The only reasonable way to fix it is when using blockdev.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
While the idea was good the implementation not so much as we need to
take into account the old disk data and the new source. The code will be
consolidated later in a different way.
This reverts commit 663b1d55de.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Preparing the storage source prior to assigning the alias will not work
as the names of the certain objects depend on the alias for the legacy
hotplug case as we generate the object names for the secrets based on
the alias.
This reverts commit 192fdaa614.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
For non-Linux platforms we have
virHostValidateCGroupControllers() stub which only reports an
error. But we are not marking the ignored arguments the way we
should.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This removes code duplication and simplifies cgroup detection.
As a drawback we will not have separate messages to enable cgroup
controller in kernel or to mount it. On the other side the rewrite
adds support for cgroup v2.
The kernel config support was wrong because it was parsing
'/proc/self/cgroup' instead of '/proc/cgroups/' file.
The mount suggestion is removed as well because it will not work
with cgroup v2.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
We need to configure multiple env variables for each set of tests so
create helper functions to do that.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
We need to create the cgroup v2 sysfs the same way as we do for
cgroup v1.
This introduces new VIR_CGROUP_MOCK_MODE env variable which will
configure which cgroup mode each test requires. There are three
different modes:
- legacy: only cgroup v1 is available and it's the default mode
- hybrid: both cgroup v1 and cgroup v2 are available and have some
controllers
- unified: only cgroup v2 is available
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Remove the trailing '/' from prefix. This change is required in order
to introduce tests for unified cgroups. They are usually mounted in
'/sys/fs/cgroup'.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
This enables to use both cgroup v1 and v2 at the same time together
with libvirt. It is supported by kernel and there is valid use-case,
not all controllers are implemented in cgroup v2 so there might be
configurations where administrator would enable these missing
controllers in cgroup v1.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
In order to set CPU cfs period using cgroup v2 'cpu.max' interface
we need to load the current value of CPU cfs quota first because
format of 'cpu.max' interface is '$quota $period' and in order to
change 'period' we need to write 'quota' as well. Writing only one
number changes only 'quota'.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
In cgroups v2 we need to handle threads and processes differently.
If you need to move a process you need to write its pid into
cgrou.procs file and it will move the process with all its threads
as well. The whole process will be moved if you use tid of any thread.
In order to move only threads at first we need to create threaded group
and after that we can write the relevant thread tids into cgroup.threads
file. Threads can be moved only into cgroups that are children of
cgroup of its process.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
When creating cgroup hierarchy we need to enable controllers in the
parent cgroup in order to be usable. That means writing "+{controller}"
into cgroup.subtree_control file. We can enable only controllers that
are enabled for parent cgroup, that means we need to do that for the
whole cgroup tree.
Cgroups for threads needs to be handled differently in cgroup v2. There
are two types of controllers:
- domain controllers: these cannot be enabled for threads
- threaded controllers: these can be enabled for threads
In addition there are multiple types of cgroups:
- domain: normal cgroup
- domain threaded: a domain cgroup that serves as root for threaded
cgroups
- domain invalid: invalid cgroup, can be changed into threaded, this
is the default state if you create subgroup inside
domain threaded group or threaded group
- threaded: threaded cgroup which can have domain threaded or
threaded as parent group
In order to create threaded cgroup it's sufficient to write "threaded"
into cgroup.type file, it will automatically make parent cgroup
"domain threaded" if it was only "domain". In case the parent cgroup
is already "domain threaded" or "threaded" it will modify only the type
of current cgroup. After that we can enable threaded controllers.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
