The hint was introduced a long time ago when broken TSX implementation
was found in Haswell and Broadwell CPUs. Since then many more CPUs with
TSX were introduced and and disabled due to TAA vulnerability.
Thus the hint is not very useful and I think removing it is a better
choice then updating it to cover all current noTSX models.
This partially reverts:
commit 7f127ded65
cpu: Rework cpuCompare* APIs
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Pass the packed option on the QEMU command line of the capability for
packed virtqueues is detected and the parameter is set explicitly.
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Expose the virtio parameter for packed virtqueues as an optional libvirt
XML attribute to virtio-backed devices, e.g.:
<interface type='user'>
<mac address='00:11:22:33:44:55'/>
<model type='virtio'/>
<driver packed='on'/>
</interface>
If the attribute is omitted, the default value for this attribute is 'off' and
regular split virtqueues are used.
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Add the capability for QEMU's packed virtqueues for virtio that supposedly have
better cache utilization and performance compared to the default split queues.
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Update s390x capabilities for QEMU 4.2 with the actual GA version for
QEMU and on the latest z15 machine.
This picks up the new blockdev capability, so we need to refresh a bunch
of test cases as well.
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Unlike `waitpid`, `virProcessWait` only returns -1 (error) or 0
(success), so comparing that to `pid` will always be false and the
parent will report failure with:
error : main:851 : Failed to fork as daemon: No such file or directory
even though the grandchild process is succesfully running. Note that the
errno message is misleading: it was last set when trying to find a
restart state file.
Signed-off-by: Rafael Fonseca <r4f4rfs@gmail.com>
Reported-by: Marcin Krol <hawk@tld-linux.org>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Replace vm->def->disks[i] with dom_disk variable which is
initialized to the same disk.
Signed-off-by: Yi Li <yili@winhong.com>
Reviewed-by: Pavel Mores <pmores@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This organizes the existing contents into sections, tweaks some parts
a bit and adds links to the pages where the contents that were ripped
out of hacking.rst now live, either inline or in the catch-all "further
reading" section depending on what makes more sense.
The result is that it's now possible to consume this page, which is
the entry point for new contributors, in just a few minutes, and then
drill down further based on factors such as the familiarity with the
open source development model or mail-based workflows.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
These guidelines should already be familiar to people who have
contributed to other open source projects, so it doesn't make much
sense for them to be so prominent. Move them to a separate page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This is a relatively lengthy part with lots of details, which many
people who are familiar with a mail-based development workflow will
already know and which will become obsolete once we move to GitLab.
Move the contents to a separate page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This part contains a lot of useful tips, but presenting all of them
at the same time obfuscated the central message which is, 'make check'
and 'make syntax-check' must pass after each patch in a series. Let's
move them to a separate page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
While it's good to have these rules written down for reference, they
apply exclusively to committers, who by definition are familiar with
the project and probably work on it daily, so there's no need to have
them front and center when a separate page will do.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This part describes entirely optional tooling, so it makes sense not
to have it advertised too prominently. Move it to a separate page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Most new contributors are probably going to modify existing code rather
than introducing all-new programs and scripts, and even when the latter
happen they'll hopefully get a feel for which programming languages are
considered acceptable for the project by looking at what's already in
the repo. Make this part less prominent by moving it to a separate page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This part represents the biggest chunk of the existing hacking.rst, and
despite that its utility is very limited because 'make syntax-check'
already guarantees most of the rules are followed over time.
Until the glorious day we finally codify our coding style completely
into a configuration for a tool such as clang-format and thus no longer
need a plain English description of it, move this part to a separate
page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This part is very specific and doesn't quite fit into the "coding
style" section, so let's move it to its own page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The conversion has been performed by using pandoc as a first pass,
and then tweaking the result manually until it looked satisfactory.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Libvirt uses GitHub as an automated read-only mirror. The goals were to
have a disaster recovery backup for libvirt.org, a way to make it easy
for people to clone their own private copy of libvirt Git, and finally
as a way to interact with apps like Travis.
The project description was set to a message telling people that we
don't respond to pull requests. This was quite a negative message to
potential contributors, and also did not give them any guidance about
the right way to submit to libvirt. Many also missed the description and
submitted issues or pull requests regardless.
It is possible to disable the issue tracker in GitHub, but there is no
way to disable merge requests. Disabling the issue tracker would also
leave the problem of users not being given any positive information
about where they should be reporting instead.
There is a fairly new 3rd party application built for GitHub that
provides a bot which auto-responds to both issues and merge requests,
closing and locking them, with a arbitrary comment:
https://github.com/apps/repo-lockdown
This commit adds a suitable configuration file for libvirt, which
tries to give a positive response to user's issue/pullreq and guide
them to the desired contribution path on GitLab.
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
So far, libvirt generates the following path for automatic dumps:
$autoDumpPath/$id-$shortName-$timestamp
where $autoDumpPath is where libvirt stores dumps of guests (e.g.
/var/lib/libvirt/qemu/dump), $id is domain ID and $shortName is
shortened version of domain name. So for instance, the generated
path may look something like this:
/var/lib/libvirt/qemu/dump/1-QEMUGuest-2020-03-25-10:40:50
While in case of embed driver the following path would be
generated by default:
$root/lib/libvirt/qemu/dump/1-QEMUGuest-2020-03-25-10:40:50
which is not clashing with other embed drivers, we allow users to
override the default and have all embed drivers use the same
prefix. This can create clashing paths. Fortunately, we can reuse
the approach for machined name generation
(v6.1.0-178-gc9bd08ee35) and include part of hash of the root in
the generated path.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
So far, libvirt generates the following path for memory:
$memoryBackingDir/$id-$shortName/ram-nodeN
where $memoryBackingDir is the path where QEMU mmaps() memory for
the guest (e.g. /var/lib/libvirt/qemu/ram), $id is domain ID
and $shortName is shortened version of domain name. So for
instance, the generated path may look something like this:
/var/lib/libvirt/qemu/ram/1-QEMUGuest/ram-node0
While in case of embed driver the following path would be
generated by default:
$root/lib/qemu/ram/1-QEMUGuest/ram-node0
which is not clashing with other embed drivers, we allow users to
override the default and have all embed drivers use the same
prefix. This can create clashing paths. Fortunately, we can reuse
the approach for machined name generation
(v6.1.0-178-gc9bd08ee35) and include part of hash of the root in
the generated path.
Note, the important change is in qemuGetMemoryBackingBasePath().
The rest is needed to pass driver around.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
So far, libvirt generates the following path for hugepages:
$mnt/libvirt/qemu/$id-$shortName
where $mnt is the mount point of hugetlbfs corresponding to
hugepages of desired size (e.g. /dev/hugepages), $id is domain ID
and $shortName is shortened version of domain name. So for
instance, the generated path may look something like this:
/dev/hugepages/libvirt/qemu/1-QEMUGuest
But this won't work with embed driver really, because if there
are two instances of embed driver, and they both want to start a
domain with the same name and with hugepages, both drivers will
generate the same path which is not desired. Fortunately, we can
reuse the approach for machined name generation
(v6.1.0-178-gc9bd08ee35) and include part of hash of the root in
the generated path.
Note, the important change is in qemuGetBaseHugepagePath(). The
rest is needed to pass driver around.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This reverts commit 06a19921b6.
What I haven't realized when writing this ^^ commit is that the
virQEMUDriver structure already stores the root directory path.
And since the pointer is immutable it can be accessed right from
the structure and thus there is no need to duplicate it in the
driver config.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The cfg->root is going away, therefore get the info right from
the driver structure.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The code that generates "qemu-embed-$hash" is going to be useful
in more places. Separate it out into a function.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The virDomainGenerateMachineName() function doesn't belong in
src/conf/ really, because it has nothing to do with domain XML
parsing. It landed there because of lack of better place in the
past. But now that we have src/hypervisor/ the function should
live there. At the same time, the function name is changed to
match new location.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Initially introduced in v3.10.0-rc1~172.
When generating a path for memory-backend-file or -mem-path, qemu
driver will use the following pattern:
$memoryBackingDir/libvirt/qemu/$id-$shortName
where $memoryBackingDir defaults to /var/lib/libvirt/qemu/ram but
can be overridden in qemu.conf. Anyway, the "/libvirt/qemu/" part
looks redundant, because it's already contained in the default,
or creates unnecessary nesting if overridden in qemu.conf.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Introduced in v1.2.17-rc1~121, the assumption was that the
driver->privileged is immutable at the time but it might change
in the future. Well, it did not ever since. It is still immutable
variable. Drop the needless accessor then.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
The virQEMUDriverConfigNew() accepts path to root directory for
embed mode as an argument. If the argument is not NULL it uses
the passed value as prefix for some internal paths (e.g.
cfg->libDir). If it is NULL though, it looks if the other
argument, @privileged is true or false and generates internal
paths accordingly. But when calling the function from the test
suite, instead of passing NULL for @root, an empty string is
passed. Fortunately, this doesn't create a problem because in
both problematic cases the generated paths are "fixed" to point
somewhere into build dir or the code which is tested doesn't
access them.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Commit 54a401af47 split out DriverConfigInit from DriverConfigNew, but
then called it a bit late from libxlStateInitialize. The cfg is used in
libxlDriverConfigLoadFile and when uninitialized results in a crash.
Calling DriverConfigInit immediately after DriverConfigNew fixes the
crash.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
In the 'topology' element it is mentioned, regarding the sockets
value, "They refer to the total number of CPU sockets".
This is not accurate. What we're doing is calculating the number
of sockets per NUMA node, which can be checked in the current
implementation of virHostCPUGetInfoPopulateLinux(). Calculating
the total number of sockets would break the topology sanity
check nodes*sockets*cores*threads=online_cpus.
This documentation fix is important to avoid user confusion when
seeing the output of 'virsh capabilities' and expecting it to be
equal to the output of 'lscpu'. E.g in a Power 9 host this 'lscpu'
output:
Architecture: ppc64le
Byte Order: Little Endian
CPU(s): 160
On-line CPU(s) list: 0-159
Thread(s) per core: 4
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Model: 2.2 (pvr 004e 1202)
Model name: POWER9, altivec supported
And this XML output from virsh capabilities:
<cpu>
<arch>ppc64le</arch>
<model>POWER9</model>
<vendor>IBM</vendor>
<topology sockets='1' dies='1' cores='20' threads='4'/>
(...)
</cpu>
Both are correct, as long as we mention in the Libvirt documentation
that 'sockets' in the topology element represents the number of sockets
per NUMA node.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Redeclared variables in script functions marked as local.
Variables `guest_running` and `guests_shutting_down` in the
functions 'guest_is_on` and `check_guests_shutdown` were
untouched, as the functions returned values in these
variables.
Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This option prevents misbehaviours on guest if a qemu 9pfs export
contains multiple devices, due to the potential file ID collisions
this otherwise may cause.
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Introduce new 'multidevs' option for filesystem.
<filesystem type='mount' accessmode='mapped' multidevs='remap'>
<source dir='/path'/>
<target dir='mount_tag'>
</filesystem>
This option prevents misbehaviours on guest if a qemu 9pfs export
contains multiple devices, due to the potential file ID collisions
this otherwise may cause.
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The QEMU 9pfs 'multidevs' option exists since QEMU 4.2. Probe QEMU's
command line set though to check whether this option is really
available, and if yes enable this new QEMU_CAPS_FSDEV_MULTIDEVS
capability on libvirt side.
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
