This hunk was introduced in [1] in order to avoid loosing
events from monitor on stopping qemu process. But as explained
in [2] on destroy we won't get neither EOF nor any other
events as monitor is just closed. In case of crash/shutdown
we won't get any more events as well and qemuDomainObjStopWorker
will be called by qemuProcessStop eventually. Thus let's
remove qemuDomainObjStopWorker from qemuProcessHandleMonitorEOF
as it is not useful anymore.
[1] e6afacb0f: qemu: start/stop an event loop thread for domains
[2] d2954c072: qemu: ensure domain event thread is always stopped
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This allows:
a) migration without access to network
b) complete control of the migration stream
c) easy migration between containerised libvirt daemons on the same host
Resolves: https://bugzilla.redhat.com/1638889
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Consider a host with 8 CPUs. There are the following possible scenarios
1. Bare metal; libvirtd has affinity of 8 CPUs; QEMU should get 8 CPUs
2. Bare metal; libvirtd has affinity of 2 CPUs; QEMU should get 8 CPUs
3. Container has affinity of 8 CPUs; libvirtd has affinity of 8 CPus;
QEMU should get 8 CPUs
4. Container has affinity of 8 CPUs; libvirtd has affinity of 2 CPus;
QEMU should get 8 CPUs
5. Container has affinity of 4 CPUs; libvirtd has affinity of 4 CPus;
QEMU should get 4 CPUs
6. Container has affinity of 4 CPUs; libvirtd has affinity of 2 CPus;
QEMU should get 4 CPUs
Scenarios 1 & 2 always work unless systemd restricted libvirtd privs.
Scenario 3 works because libvirt checks current affinity first and
skips the sched_setaffinity call, avoiding the SYS_NICE issue
Scenario 4 works only if CAP_SYS_NICE is availalbe
Scenarios 5 & 6 works only if CAP_SYS_NICE is present *AND* the cgroups
cpuset is not set on the container.
If libvirt blindly ignores the sched_setaffinity failure, then scenarios
4, 5 and 6 should all work, but with caveat in case 4 and 6, that
QEMU will only get 2 CPUs instead of the possible 8 and 4 respectively.
This is still better than failing.
Therefore libvirt can blindly ignore the setaffinity failure, but *ONLY*
ignore it when there was no affinity specified in the XML config.
If user specified affinity explicitly, libvirt must report an error if
it can't be honoured.
Resolves: https://bugzilla.redhat.com/1819801
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Adds new typed param for migration and uses this as a UNIX socket path that
should be used for the NBD part of migration. And also adds virsh support.
Partially resolves: https://bugzilla.redhat.com/1638889
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Clean up the semantics by using one extra self-describing variable.
This also fixes the port allocation when the port is specified.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Instead of saving some data from a union up front and changing an overlayed
struct before using said data, let's just set the new values after they are
decided. This will increase the readability of future commit(s).
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
In 6.7.0 release I've changed how domain namespace is built and
populated. Previously it used to be done from a pre-exec hook
(ran in the forked off child, just before dropping all privileges
and exec()-ing QEMU), which not only meant we had to have two
different code paths for creating a node in domain's namespace
(one for this pre-exec hook, the other for hotplug ran from the
daemon), it also proved problematic because it was leaking FDs
into QEMU process.
To mitigate this problem, we've not only ditched libdevmapper
from the NS population process, I've also dropped the pre-exec
code and let the NS be populated from the daemon (using the
hotplug code). But, I was not careful when doing so, because the
pre-exec code was tolerant to files that doesn't exist, while
this new code isn't. For instance, the very first thing that is
done when the new NS is created is it's populated with
@defaultDeviceACL which contain files like /dev/null, /dev/zero,
/dev/random and /dev/kvm (and others). While the rest will
probably exist every time, /dev/kvm might not and thus the new
code I wrote has to be tolerant to that.
Of course, users can override the @defaultDeviceACL (by setting
cgroup_device_acl in qemu.conf) and remove /dev/kvm (which is
acceptable workaround), but we definitely want libvirt to work
out of the box even on hosts without KVM.
Fixes: 9048dc4e62
Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Since QEMU 1.5.3, the ib700 watchdog device has no options for address,
and not address in device tree:
$ /usr/libexec/qemu-kvm -version
QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-175.el7), Copyright (c) 2003-2008 Fabrice Bellard
$ /usr/libexec/qemu-kvm -device ib700,\?
$ virsh qemu-monitor-command seabios --hmp info qtree|grep ib700 -A 2
dev: ib700, id "watchdog0"
dev: isa-serial, id "serial0"
index = 0
So only allow it to use none address.
Fixes: 8a54cc1d08
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1509908
Signed-off-by: Han Han <hhan@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
qemuAgentFSInfoToPublic() currently only sets the devAlias for PCI devices.
However, the QEMU guest agent could also provide the device name in the
"dev" field of the response for other devices instead (well, at least after
fixing another problem in the current QEMU guest agent...). So if creating
the devAlias from the PCI information failed, let's fall back to the name
provided by the guest agent. This helps to fix the empty "Target" fields
that occur when running "virsh domfsinfo" on s390x where CCW devices are
used for the guest instead of PCI devices.
Also add a proper debug message here in case we completely failed to set the
device alias, since this problem here was very hard to debug: The only two
error messages that I've seen were "Unable to get filesystem information"
and "Unable to encode message payload" - which only indicates that something
went wrong in the RPC call. No debug message indicated the real problem, so
I had to learn the hard way why the RPC call failed (it apparently does not
like devAlias left to be NULL) and where the real problem comes from.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1755075
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
libvirt currently silently allows <timer name="kvmclock"/> and some
other timer tags in the guest XML definition for timers that do not
exist on non-x86 systems. We should not silently ignore these tags
since the users might not get what they expected otherwise.
Note: The error is only generated if the timer is marked with
present="yes" - otherwise we would suddenly refuse XML definitions
that worked without problems before.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1754887
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Currently, we are mixing: #if HAVE_BLAH with #if WITH_BLAH.
Things got way better with Pavel's work on meson, but apparently,
mixing these two lead to confusing and easy to miss bugs (see
31fb929eca for instance). While we were forced to use HAVE_
prefix with autotools, we are free to chose our own prefix with
meson and since WITH_ prefix appears to be more popular let's use
it everywhere.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Setting IFF_VNET_HDR for a tap device passes the whole packet to the
host, reducing emulation overhead and improving performance.
Libvirt bases its decision about applying IFF_VNET_HDR to the tap
interface on whether or not the model of the emulated network device
is virtio. Originally, virtio was the only model to support
IFF_VNET_HDR in QEMU; however, the e1000e & vmxnet3 adapters have also
supported it since their introductions - QEMU commit
786fd2b0f87 for vmxnet3, and QEMU commit 6f3fbe4ed0 for e1000e, so it
should be set for those models too.
Signed-off-by: Patrick Magauran <patmagauran.j@gmail.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Laine Stump <laine@redhat.com>
By default Xen only allows guests to write "known safe" values into PCI
configuration space, yet many devices require writes to other areas of
the configuration space in order to operate properly. To allow writing
any values Xen supports the 'permissive' setting, see xl.cfg(5) man page.
This change models Xen's permissive setting by adding a writeFiltering
attribute on the <source> element of a PCI hostdev. When writeFiltering
is set to 'no', the Xen permissive setting will be enabled and guests
will be able to write any values into the device's configuration space.
The permissive setting remains disabled in the absense of the
writeFiltering attribute, of if it is explicitly set to 'yes'.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Signed-off-by: Simon Gaiser <simon@invisiblethingslab.com>
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Add a configuration option for specifying location of the qemu modules
directory, defaulting to /usr/lib64/qemu. Then use this location to
check for changes in the directory, indicating that a qemu module has
changed and capabilities need to be reprobed.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The list archives, people.redhat.com and bugzilla all support
https.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Reviewed-by: Neal Gompa <ngompa13@gmail.com>
When creating a standard tap device, if provided with an ifname that
contains "%d", rather than taking that literally as the name to use
for the new device, the kernel will instead use that string as a
template, and search for the lowest number that could be put in place
of %d and produce an otherwise unused and unique name for the new
device. For example, if there is no tap device name given in the XML,
libvirt will always send "vnet%d" as the device name, and the kernel
will create new devices named "vnet0", "vnet1", etc. If one of those
devices is deleted, creating a "hole" in the name list, the kernel
will always attempt to reuse the name in the hole first before using a
name with a higher number (i.e. it finds the lowest possible unused
number).
The problem with this, as described in the previous patch dealing with
macvtap device naming, is that it makes "immediate reuse" of a newly
freed tap device name *much* more common, and in the aftermath of
deleting a tap device, there is some other necessary cleanup of things
which are named based on the device name (nwfilter rules, bandwidth
rules, OVS switch ports, to name a few) that could end up stomping
over the top of the setup of a new device of the same name for a
different guest.
Since the kernel "create a name based on a template" functionality for
tap devices doesn't exist for macvtap, this patch for standard tap
devices is a bit different from the previous patch for macvtap - in
particular there was no previous "bitmap ID reservation system" or
overly-complex retry loop that needed to be removed. We simply find
and unused name, and pass that name on to the kernel instead of
"vnet%d".
This counter is also wrapped when either it gets to INT_MAX or if the
full name would overflow IFNAMSIZ-1 characters. In the case of
"vnet%d" and a 32 bit int, we would reach INT_MAX first, but possibly
someday someone will change the name from vnet to something else.
(NB: It is still possible for a user to provide their own
parameterized template name (e.g. "mytap%d") in the XML, and libvirt
will just pass that through to the kernel as it always has.)
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
There have been some reports that, due to libvirt always trying to
assign the lowest numbered macvtap / tap device name possible, a new
guest would sometimes be started using the same tap device name as
previously used by another guest that is in the process of being
destroyed *as the new guest is starting.
In some cases this has led to, for example, the old guest's
qemuProcessStop() code deleting a port from an OVS switch that had
just been re-added by the new guest (because the port name is based on
only the device name using the port). Similar problems can happen (and
I believe have) with nwfilter rules and bandwidth rules (which are
both instantiated based on the name of the tap device).
A couple patches have been previously proposed to change the ordering
of startup and shutdown processing, or to put a mutex around
everything related to the tap/macvtap device name usage, but in the
end no matter what you do there will still be possible holes, because
the device could be deleted outside libvirt's control (for example,
regular tap devices are automatically deleted when the qemu process
terminates, and that isn't always initiated by libvirt but could
instead happen completely asynchronously - libvirt then has no control
over the ordering of shutdown operations, and no opportunity to
protect it with a mutex.)
But this only happens if a new device is created at the same time as
one is being deleted. We can effectively eliminate the chance of this
happening if we end the practice of always looking for the lowest
numbered available device name, and instead just keep an integer that
is incremented each time we need a new device name. At some point it
will need to wrap back around to 0 (in order to avoid the IFNAMSIZ 15
character limit if nothing else), and we can't guarantee that the new
name really will be the *least* recently used name, but "math"
suggests that it will be *much* less common that we'll try to re-use
the *most* recently used name.
This patch implements such a counter for macvtap/macvlan, replacing
the existing, and much more complicated, "ID reservation" system. The
counter is set according to whatever macvtap/macvlan devices are
already in use by guests when libvirtd is started, incremented each
time a new device name is needed, and wraps back to 0 when either
INT_MAX is reached, or when the resulting device name would be longer
than IFNAMSIZ-1 characters (which actually is what happens when the
template for the device name is "maccvtap%d"). The result is that no
macvtap name will be re-used until the host has created (and possibly
destroyed) 99,999,999 devices.
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
When editing a domain with hotplug enabled, I removed the only
NUMA node it had and got no error. I got the error later though,
when starting the domain. This is not as user friendly as it can
be. Move the validation call out from command line generator and
into domain validator (which is called prior to starting cmd line
generation anyway).
When doing this, I had to remove memory-hotplug-nonuma xml2xml
test case because there is no way the test case can succeed,
obviously.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Non-x86 archs does not have a 'microcode' version like x86. This is
covered already inside the function - just return 0 if no microcode
is found. Regardless of that, a read of /proc/cpuinfo is always made.
Each read will invoke the kernel to fill in the CPU details every time.
Now let's consider a non-x86 host, like a Power 9 server with 128 CPUs.
Each /proc/cpuinfo read will need to fetch data for each CPU and it
won't even matter because we know beforehand that PowerPC chips don't
have microcode information.
We can do better for non-x86 hosts by skipping this process entirely.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Since the macro no longer includes the 'ignore_value'
statement, stop putting another empty statement after it.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Many of our functions start with a DEBUG statement.
Move the statements after declarations to appease
our coding style.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Split those initializations that depend on a statement
above them.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Use virJSONValueObjectCreate rather than creating the object
piece-by-piece and use new accessors for bitmap to simplify the code.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Introduce a new device element "<audio>" which allows
to map guest sound device specified using the "<sound>"
element to specific audio backend.
Example:
<sound model='ich7'>
<audio id='1'/>
</sound>
<audio id='1' type='oss'>
<input dev='/dev/dsp0'/>
<output dev='/dev/dsp0'/>
</audio>
This block maps to OSS audio backend on the host using
/dev/dsp0 device for both input (recording)
and output (playback).
OSS is the only backend supported so far.
Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Add 'ich7' sound model. This is a preparation for sound support in
bhyve, as 'ich7' is the only model it supports.
Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Back when the original version of this chunk of code was added (commit
41b087198 in libvirt-0.8.1 in April 2010), we used virExecDaemonize()
to start the qemu process, and would continue on in the function
(which at that time was called qemudStartVMDaemon()) even if a -1 was
returned. So it was possible to get to this code with rv == -1 (it was
called "ret" in that version of the code).
In modern libvirt code, qemu is started with virCommandRun(); then we
call virPidFileReadPath(); those are the only two ways of setting "rv"
prior to this code being removed, and in either case if the new value
of rv < 0, then we immediately skip over the rest of the code to the
cleanup: label.
This means that the code being removed by this patch is
unreachable.
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Even if namespaces are disabled, then due to a missing check at the
beginning of qemuDomainBuildNamespace(), the domain startup code
still tries to populate (nonexistent) domain's namespace.
Fixes: 8da362fe62
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
After the recent changes, this function is now always returning
zero. Turn it to 'void' to relieve callers from checking it.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
We don't need the auto-alignment now that the user is handling
it by hand.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
The existing auto-align behavior for pSeries has the idea to
alleviate user configuration of the NVDIMM size, given that the
alignment calculation is not trivial to do (256MiB alignment
of mem->size - mem->label_size value, a.k.a guest area). We
align mem->size down to avoid end of file problems.
The end result is not ideal though. We do not touch the domain
XML, meaning that the XML can report a NVDIMM size 255MiB smaller
than the actual size the guest is seeing. It also adds one more
thing to consider in case the guest is reporting less memory
than declared, since the auto-align is transparent to the
user.
Following Andrea's suggestion in [1], let's instead do an
size alignment validation. If the NVDIMM is unaligned, error out
and suggest a rounded up value. This can be bothersome to users,
but will bring consistency of NVDIMM size between the domain XML
and the guest.
This approach will force existing non-running pSeries guests to
readjust the NVDIMM value in their XMLs, if necessary. No changes
were made for x86 NVDIMM support.
[1] https://www.redhat.com/archives/libvir-list/2020-July/msg01471.html
Suggested-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Next patch will use it outside of qemu_domain.c.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This function is not changing the domain definition, it's only
reading from it. The function is going to be used from another
function which already takes const virDomainDef. Make the @def
const to avoid typecasting it.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Commit 4362068979 moved the function to
util/virqemu.c which is compiled also on win32 and geteuid()/getegid()
doesn't exist there.
Move it to qemu_domain.c which is compiled only when the qemu driver is
enabled. Originally I didn't want to put it here as qemu_domain.c is a
code dump for helper functions but this is the least invasive fix.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
We've dumped all the snapshot helpers and related code into
qemu_driver.c. It accounted for ~10% of overal size of qemu_driver.c.
Separate the code to qemu_snapshot.c/h.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
There's a lot of helper code related to the save image handling. Extract
it to qemu_saveimage.c/h.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Move the code to qemu_domain.c so that it can be reused in other parts
of the qemu driver. 'qemu_domain' was chosen as we check the domain
state after closing the wrapper.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Move the code to qemu_domain.c so that it can be reused in other parts
of the qemu driver. 'qemu_domain' was chosen as the permissions are
based on the domain configuration.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Use automatic memory allocation to simplify the code and remove the need
for a 'cleanup:' label.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Use automatic memory allocation and move variables into correct scope to
simplify the code and remove the need for a 'cleanup:' label.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Use automatic memory allocation and move variables into correct scope to
simplify the code and remove the need for a 'error:' label.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Use automatic memory allocation and move variables into correct scope to
simplify the code and remove the need for a 'error:' label.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This function doesn't have an overly verbose cleanup section as there
isn't any error code path. Unify it with the rest of the functions which
will simplify adding a possible error path.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Both parsing and formatting of NBD migration jobs is QEMU specific and
since we're trying to create a hypervisor-agnostic module out of
qemu_domainjob.c, move the NBD XML handling bits to the qemu_domain
module instead. Additionally, move the respective NBD XML calls to
the 'parseJob'/'formatJob' callbacks of the
qemuDomainObjPrivateJobCallbacks structure.
Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Functions `qemuDomainRemoveInactiveJob` and
`qemuDomainRemoveInactiveJobLocked` had their declaration misplaced in
`qemu_domainjob` and were moved to `qemu_domain` where their definitions
reside.
Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
