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>
Cgroup v2 has only single mount point for all controllers. The list
of controllers is stored in cgroup.controllers file, name of controllers
are separated by space.
In cgroup v2 there is no cpuacct controller, the cpu.stat file always
exists with usage stats.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
If the placement was copied from parent or set to absolute path
there is nothing to do, otherwise set the placement based on
process placement from /proc/self/cgroup or /proc/{pid}/cgroup.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
When reconnecting to a domain we are validating the cgroup name.
In case of cgroup v2 we need to validate only the new format for host
without systemd '{machinename}.libvirt-{drivername}' or scope name
generated by systemd.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
We cannot detect only mount points to figure out whether cgroup v2
is available because systemd uses cgroup v2 for process tracking and
all controllers are mounted as cgroup v1 controllers.
To make sure that this is no the situation we need to check
'cgroup.controllers' file if it's not empty to make sure that cgroup
v2 is not mounted only for process tracking.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Place cgroup v2 backend type before cgroup v1 to make it obvious
that cgroup v2 is preferred implementation.
Following patches will introduce support for hybrid configuration
which will allow us to use both at the same time, but we should
prefer cgroup v2 regardless.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
My commit d6b8838 fixed the uid:gid for the pre-created UNIX sockets
but did not account for the different umask of libvirtd and QEMU.
Since commit 0e1a1a8c we set umask to '0002' for the QEMU process.
Manually tune-up the permissions to match what we would have gotten
if QEMU had created the socket.
https://bugzilla.redhat.com/show_bug.cgi?id=1633389
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1632711
GlusterFS is typically safe when it comes to migration. It's a
network FS after all. However, it can be mounted via FUSE driver
they provide. If that is the case we fail to identify it and
think migration is not safe and require VIR_MIGRATE_UNSAFE flag.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
In commit v4.7.0-168-g993d85ae5e I introduced two Icelake CPU models,
but failed to actually include them in the CPU map index.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
We switched to opening mode='bind' sockets ourselves:
commit 30fb2276d8
qemu: support passing pre-opened UNIX socket listen FD
in v4.5.0-rc1~251
Then fixed qemuBuildChrChardevStr to change libvirtd's label
while creating the socket:
commit b0c6300fc4
qemu: ensure FDs passed to QEMU for chardevs have correct SELinux labels
v4.5.0-rc1~52
Also add labeling of these sockets to the DAC driver.
Instead of duplicating the logic which decides whether libvirt should
pre-create the socket, assume an existing path meaning that it was created
by libvirt.
https://bugzilla.redhat.com/show_bug.cgi?id=1633389
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This function updates the used QEMU capabilities of @vm by querying
the QEMU capabilities cache.
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Stefan Zimmermann <stzi@linux.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Move the fetch of @ipAddrLeft to after the goto skip_instantiate
and remove the (req->binding) guard since we know that as long
as req->binding is created, then req->threadkey is filled in.
Found by Coverity
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
It's possible that the @outbuf and/or @errbuf could be NULL
and thus we need to use the right comparison macro.
Found by Coverity
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
Rather than initialize actualconfig and expectconfig before
having the possibility that libxlDriverConfigNew could fail
and thus land in cleanup, let's just move them and return
immediately upon failure.
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
Commit 87a8a30d6 added the function based on the virsh function,
but used an unsigned long long instead of a double and thus that
limits the maximum result.
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
While unlikely, sysconf(_SC_CLK_TCK) could fail leading to
indeterminate results for the subsequent division. So let's
just remove the # define and inline the same change.
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
When libxlDomainMigrationDstPrepare adds the @args to an
virNetSocketAddIOCallback using libxlMigrateDstReceive as
the target of the virNetSocketIOFunc @func with the knowledge
that the libxlMigrateDstReceive will virObjectUnref @args
at the end thus not needing to Unref during normal processing
for libxlDomainMigrationDstPrepare.
However, Coverity believes there's an issue with this. The
problem is there can be @nsocks virNetSocketAddIOCallback's
added, but only one virObjectUnref. That means the first
one done will Unref and the subsequent callers may not get
the @args (or @opaque) as they expected. If there's only
one socket returned from virNetSocketNewListenTCP, then sure
that works. However, if it returned more than one there's
going to be a problem.
To resolve this, since we start with 1 reference from the
virObjectNew for @args, we will add 1 reference for each
time @args is used for virNetSocketAddIOCallback. Then
since libxlDomainMigrationDstPrepare would be done with
@args, move it's virObjectUnref from the error: label to
the done: label (since error: falls through). That way
once the last IOCallback is done, then @args will be freed.
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
Remove the "!params" check from the condition since it's possible
someone could pass a non NULL value there, but a 0 for the nparams
and thus continue on. The external API only checks if @nparams is
non-zero, then check for NULL @params.
Found by Coverity
Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>
Introduced by:
commit 635ae38979
commit 1b745219c7
But their HAVE_ counterparts were never used.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Introduced by:
commit 3c37a171a2
Add check for kill() to fix build of cgroups on win32
Made redundant by:
commit 02f1fd41f6
cgroup macros refactoring, part 1
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Introduced by:
commit b38d045dea
Remove use of sys/poll.h on mingw
Made redundant by:
commit 0c97e70b74
Update event loop example programs to demonstrate best practice
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
