Hint users that they can use 'virt-admin' also for the new monolithic
daemons.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2038045
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Modular daemons are now the default in many new installations, thus we
need to include steps how to determine that modular daemons are used and
modular-daemon specific locations for the config files and admin URIs.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Since we are at a transition period where some users may be running
monolithic libvirtd and others already the modular topology we need a
section that allows users to figure out which is in use.
This will be particularly important in the document about enabling
logging, as the active log file depends on which daemon is in use.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
The socket permissions are controlled by 'unix_sock_admin_perms', but
regardless the code requires that 'geteuid() != clientuid' to allow
clients thus it doesn't make sense to make users aware of it.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
It's the only GIF file we have in our repository.
We could convert it to PNG, but that would result in a
significantly bigger file (~5.5 KiB vs ~1.5 KiB).
Since the image doesn't really add much to the documentation,
drop it instead.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
When invoking 'virsh guestinfo $VM' without explicitly specifying a
group of information to return, virsh always reports success even when
the guest agent doesn't report any information in the current state.
This is desired in situations when you are okay with stats being missing
and avoids spurious errors being reported.
Clarify that this is really desired in the man page.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2041665
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
It's a tool name so use backticks to format it in monospace.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Move out the settings required to pre libvirt-4.4.0 deployments into a
separate section so that the main point is not cluttered by now mostly
irrelevant settings.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Enabling the logs is the focus of this article. Decouple it from the
first section.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Use the heading hierarchy as generated by pandoc which we use in most
of the converted XML format docs.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This was not mentioned before.
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This partially reverts commit 9ccbed6afb.
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
sysconfig files are owned by the admin of the host. They have the
liberty to put anything they want into these files. This makes it
difficult to provide different built-in defaults.
Remove the sysconfig file and place the current desired default into
the service file.
Local customizations can now go either into /etc/sysconfig/name
or /etc/systemd/system/name.service.d/my-knobs.conf
Attempt to handle upgrades in libvirt.spec.
Dirty files which are marked as %config will be renamed to file.rpmsave.
To restore them automatically, move stale .rpmsave files away, and
catch any new rpmsave files in %posttrans.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
The code style showed `bool hasFoos; if (hasFoos == true)` as a
good example in one place, only to warn against comparisons with
`true` a couple of paragraphs further down.
Merge this advice on comparing with `true` into the "Conditional
expressions" section and split the example up for readability.
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
A few places are still using an expend yes/no choice instead of the
common virYesNo definition.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The docs illustration for the <os> schema contains a mixture of
incompatible configuration options. This is rather confusing and
misleading to users. Splitting the illustration into four separate
examples clarifies the situation.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Detect these commands in docs/meson.build, i.e. only when
users enable documentation.
Signed-off-by: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
While sections are somewhat loosely defined and thus the choice
is not quite a clear-cut one, section 8 might be a slightly
better fit in this case.
Suggested-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Add a sentence to the active_pcr_banks node documentation that clarifies
that when the active_pcr_banks node is removed from the XML or when it
is omitted that the set of active PCR banks is not changed anymore.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2039246
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
We don't usually provide manual pages for internal tools,
but in the case of virt-ssh-helper the command is installed
inside the default $PATH and so it's likely that the user
will stumble upon it by using the shell's completion feature
when invoking another virt-* command, which makes it a good
idea to provide at least a minimal manual page.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
After attesting a domain with the help of domlaunchsecinfo,
domsetlaunchsecstate can be used to set a secret in the guest
domain's memory prior to running the vcpus.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The burst attribute for bandwidth specifies how much bytes can be
transmitted in a single burst. Therefore, the unit is in
multiples of 1024 (thus kibibytes) not SI-like 1000. It has
always been like that.
The 'tc' output is still confusing though, for instance:
# tc class add dev $DEV parent 1: classid 1:1 htb rate 1000kbps burst 2097152
# tc class show dev vnet2
class htb 1:1 root rate 8Mbit ceil 8Mbit burst 2Mb cburst 1600b
Please note that 2097152 = 2*1024*1024. Even the man page is
confusing. From tc(8):
kb or k Kilobytes
mb or m Megabytes
But I guess this is because 'tc' predates IEC standardisation of
binary multiples and thus can't change without breaking scripts
parsing its output.
And while at it, adjust _virNetDevBandwidthRate struct member
description, to make it obvious which members use SI/IEC units.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
We have a subdirectory specifically for CSS files now, so it makes
sense to have the stylesheet that defines fonts to be there too.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This unclutters the top-level docs directory.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This unclutters the top-level docs directory.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
It was introduced in ff4ede0055 but it doesn't seem to have
ever actually been used anywhere.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
QCOW2 images now support 'extended_l2' which splits the default clusters
into 32 subcluster allocation units. This allows the allocation units to
be smaller without increasing the size of L2 table too much and thus also
the cache requirements for holding the full L2 table in memory.
Unfortunately it's incompatible with qemu versions older than 5.2 thus
can't be used as default.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Apart from the bulk conversion itself, the section names 'general
metadata' and 'target elements' were duplicated between the storage pool
and storage volume sections. To prevent heading name clashes they were
renamed appropriately.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The internals/eventloop document uses two images for
illustrative purposes, but unlike other graphics included
in the documentation these are not part of libvirt.git but
rather were added to libvirt-media.git with
commit fae5622074cf5e18d190496f8a43260c614599b2
Author: Michal Privoznik <mprivozn@redhat.com>
Date: Mon Jun 6 17:27:50 2016 +0200
Add two event loop images
These images are going to be used in our documentation of the
event loop.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
fae5622074
and are requested directly from there. Specifically, the
URLs point to the libvirt.org mirror of libvirt-media.git
instead of the primary repository hosted on GitLab.
Import the images into libvirt.git so that the website
doesn't rely on external resources and can, if desired, be
browsed entirely offline from installed packages.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Let's imagine a guest that's configured with strict numatune:
<numatune>
<memory mode='strict' nodeset='0'/>
</numatune>
For guests with NUMA:
Depending on machine type used (see commit v6.4.0-rc1~75) we
generate either:
1) -object '{"qom-type":"memory-backend-ram","id":"ram-node0",\
"size":20971520,"host-nodes":[0],"policy":"preferred"}' \
-numa node,nodeid=0,cpus=0,memdev=ram-node0
or
2) -numa node,nodeid=0,cpus=0,mem=20480
Later, when QEMU boots up and cpuset CGroup controller is
available we further restrict QEMU there too. But there's a
behaviour difference hidden: while in case 1) QEMU is restricted
from beginning, in case 2) it is not and thus it may happen that
it will allocate memory from different NUMA node and even though
CGroup will try to migrate it, it may fail to do so (e.g. because
memory is locked). Therefore, one can argue that case 2) is
broken. NB, case 2) is exactly what mode 'restrictive' is for.
However, in case 1) we are unable to update QEMU with new
host-nodes, simply because it's lacking a command to do so.
For guests without NUMA:
It's very close to case 2) from above. We have commit
v7.10.0-rc1~163 that prevents us from outputting host-nodes when
generating memory-backend-* for system memory, but that simply
allows QEMU to allocate memory anywhere and then relies on
CGroups to move it to desired location.
Due to all of this, there is no reliable way to change nodeset
for mode 'strict'. Let's forbid it.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
The whole idea of VIR_DOMAIN_NUMATUNE_MEM_RESTRICTIVE is that the
memory location is restricted only via CGroups and thus can be
changed on the fly (which is exactly what
qemuDomainSetNumaParamsLive() does. Allow this mode there then.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
While we document possibility of passing an integer from
virDomainNumatuneMemMode enum, we list string variants to only
the first three enum members. The fourth (and so far the last)
member is called 'restrictive' and thus should be documented.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Normally the SEV measurement only covers the firmware
loader contents. When doing a direct kernel boot, however,
with new enough OVMF it is possible to ask for the
measurement to cover the kernel, ramdisk and command line.
It can't be done automatically as that would break existing
guests using direct kernel boot with old firmware, so there
is a new XML setting allowing this behaviour to be toggled.
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
There are limits on the number of SEV/SEV-ES guests that can
be run on machines, which may be influenced by firmware
settings. This is important to expose to users.
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
While some SEV info is reported in the domain capabilities,
for reasons of size, this excludes the certificates. The
nodesevinfo command provides the full set of information.
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This command reports the launch security parameters for
a guest, allowing an external tool to perform a launch
attestation.
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This mode will enable all enlightenments known to the hypervisor. See
https://bugzilla.redhat.com/show_bug.cgi?id=1851249
Example:
<features>
<hyperv mode='passthrough'/>
...
</features>
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Allow for an optional attribute "mode", set to the string "custom".
Later patches will introduce different modes. Omitting this attribute
will default to "custom" for backwards compatibility.
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This does not change the schema, but will make upcoming changes
easier.
Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Dirty ring feature was introduced in qemu-6.1.0, this patch
add the corresponding feature named 'dirty-ring', which enable
dirty ring feature when starting VM.
To enable the feature, the following XML needs to be added to
the guest's domain description:
<features>
<kvm>
<dirty-ring state='on' size='xxx'>
</kvm>
</features>
If property "state=on", property "size" must be specified, which
should be power of 2 and range in [1024, 65526].
Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
After previous commit it's possible for domains to fine tune TCG
features (well, just one - tb-cache). Check that domain has TCG
enabled, otherwise the feature makes no sense.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
It may come handy to be able to tweak TCG options, in this
specific case the size of translation block cache size (tb-size).
Since we can expect more knobs to tweak let's put them under
common element, like this:
<domain>
<features>
<tcg>
<tb-cache unit='MiB'>128</tb-cache>
</tcg>
</features>
</domain>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Tested-by: Kashyap Chamarthy <kchamart@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Specifically:
* use the correct notation and markup for commands, options
and arguments;
* rename arguments meta-variables to be more descriptive;
* sort options so that the most common ones come first;
* use consistent vertical spacing;
* fix a typo.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
A couple of links were still pointing to the obsolete Go
packages instead of the current module-aware ones.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Outline some of the basics and the caveats of the non-shared migration
code.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
After conversion the table doesn't have to custom colors, but otherwise
seems to hold well.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Non-shared storage migration of guests which are disk I/O intensive and
have fast local storage may actually never converge if the guest happens
to dirty the disk faster than it can be copied.
This patch introduces a new flag
'VIR_MIGRATE_NON_SHARED_SYNCHRONOUS_WRITES' which will instruct
hypervisors to synchronize local I/O writes with the writes to remote
storage used for migration so that the guest can't overwhelm the
migration. This comes at a cost of decreased local I/O performance for
guests which behave well on average.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Separate the paragraphs where the topic changes to simplify further
additions.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
In cases when the destination storage is slower than the normal VM
storage and the VM does intensive I/O to the disk a block copy job may
never converge.
Switching it to synchronous mode will ensure that all writes done by the
guest are propagated to the destination at the cost of slowing down I/O
of the guest to the synchronous speed.
This patch adds the new API flag and implements virsh support.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This adds reporting of available TPM models and backends to the domain
capabilities schema
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
We've changed the behavior of this API that from now on it will always
restart the VM process and we are no longer able to revert to snapshots
created by libvirt older then 0.9.5.
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
We've been using the new repositories for a few months now,
but the downloads page still points to the obsolete Go packages.
Fixes: 1832c0a02b
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
To make it easier for users to figure out how the DN should be formatted.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This removes a dead link, the need for users to understand a glib function and a
improper reference to fnmatch (as we only expand asterisks to any string).
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This should make the documentation less confusing mainly for
Ceph people.
Signed-off-by: Or Ozeri <oro@il.ibm.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
The new parameter group returns information about network interfaces
Signed-off-by: zhanglei <zhanglei@smartx.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Extend the TPM backend XML with a node 'active_pcr_banks' that allows a
user to specify the PCR banks to activate before starting a VM. Valid
choices for PCR banks are sha1, sha256, sha384 and sha512. When the XML
node is provided, the set of active PCR banks is 'enforced' by running
swtpm_setup before every start of the VM. The activation requires that
swtpm_setup v0.7 or later is installed and may not have any effect
otherwise.
<tpm model='tpm-tis'>
<backend type='emulator' version='2.0'>
<active_pcr_banks>
<sha256/>
<sha384/>
</active_pcr_banks>
</backend>
</tpm>
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2016599
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Presumably the result of a copy/paste mistake, the the argument for the
`nodedev-start` command was described as a 'network' rather than a
'device'.
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
QEMU version 3.1 introduced PV_SEND_IPI CPUID feature bit under
commit 7f710c32bb8 (target-i386: adds PV_SEND_IPI CPUID feature bit).
This patch adds a new KVM feature 'pv-ipi' to disable this feature
(enabled by default). Newer CPU platform (Ex, AMD Zen2) supports
hardware accelation for IPI in guest, to use this feature to get
better performance in some scenarios. Detailed about the discussion:
https://lkml.org/lkml/2021/10/20/423
To disable kvm-pv-ipi and have libvirt add "-cpu host,kvm-pv-ipi=off"
to the QEMU command line, the following XML code needs to be added to the
guest's domain description:
<features>
<kvm>
<pv-ipi state='off'/>
</kvm>
</features>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This reverts commit 7300ccc9b3.
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Ani Sinha <ani@anisinha.ca>
The meson 0.60.0 release introduced a bug with the '/' operator when
using an empty path component. '/foo' / '' will now result in '/foo'
not '/foo/'
https://github.com/mesonbuild/meson/issues/9450
This breaks libvirt because xsltproc requires the trailing '/' on the
output directory path. Fortunately the explicit 'join_paths' function
is not affected by the regression
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit extends libvirt XML configuration to support luks2 encryption format.
This means that <encryption format="luks2" engine="librbd"> becomes valid.
Currently librbd is the only engine that supports this new format.
Signed-off-by: Or Ozeri <oro@il.ibm.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
rbd encryption is new in qemu 6.1.0.
This commit adds a new encryption engine property which
allows the user to use this new encryption engine.
Signed-off-by: Or Ozeri <oro@il.ibm.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit extends libvirt XML configuration to support a custom encryption engine.
This means that <encryption format="luks" engine="qemu"> becomes valid.
The only engine for now is qemu. However, a new engine (librbd) will be added in an upcoming commit.
If no engine is specified, qemu will be used (assuming qemu driver is used).
Signed-off-by: Or Ozeri <oro@il.ibm.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Describes the format of the newly added VPD capability and gives and
example for a real-world device.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dmitrii Shcherbakov <dmitrii.shcherbakov@canonical.com>
* XML serialization and deserialization of PCI VPD;
* PCI VPD capability flags added and used in relevant places;
* XML to XML tests for the added capability.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dmitrii Shcherbakov <dmitrii.shcherbakov@canonical.com>
Issuing simple QMP commands is pain as they need to be wrapped by the
JSON wrapper:
{ "execute": "COMMAND" }
and optionally also:
{ "execute": "COMMAND", "arguments":...}
For simple commands without arguments we can add syntax sugar to virsh
which allows simple usage of QMP and additionally prepares also for
passing through of the 'arguments' section:
virsh qemu-monitor-command $VM query-status
is equivalent to
virsh qemu-monitor-command $VM '{"execute":"query-status"}'
and
virsh qemu-monitor-command $VM query-named-block-nodes '{"flat":true}'
or
virsh qemu-monitor-command $VM query-named-block-nodes '"flat":true'
is equivalent to
virsh qemu-monitor-command $VM '{"execute":"query-named-block-nodes", "arguments":{"flat":true}}'
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Some people from Red Hat does not use 'redhat.com' domain emails.
They use personal or other domains.
Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This change introduces a new libvirt sub-element <pci> under
<features> that can be used to configure all pci related features.
Currently the only sub-sub element supported by this sub-element is
'acpi-bridge-hotplug' as shown below:
<features>
<pci>
<acpi-bridge-hotplug state='on|off'/>
</pci>
</features>
The above option is only available for the QEMU driver, for x86 guests
only. It is a global option, affecting all PCI bridge controllers on
the guest.
The 'acpi-bridge-hotplug' option enables or disables ACPI hotplug
support for cold-plugged pci bridges. Examples of bridges include the
PCI-PCI bridge (pci-bridge controller) for pc (i440fx) machinetypes,
or PCIe-PCI bridges and pcie-root-port controllers for q35
machinetypes.
For pc machinetypes in x86, this option has been available in QEMU
since version 2.1. Please see the following changes in qemu repo:
9e047b982452c6 ("piix4: add acpi pci hotplug support")
133a2da488062e ("pc: acpi: generate AML only for PCI0 devices if PCI
bridge hotplug is disabled")
For q35 machinetypes, this was introduced in QEMU 6.1 with the
following changes in qemu repo:
(a) c0e427d6eb5fef ("hw/acpi/ich9: Enable ACPI PCI hot-plug")
(b) 17858a16950860 ("hw/acpi/ich9: Set ACPI PCI hot-plug as default on
Q35")
The reasons for enabling ACPI based hotplug for PCIe (q35) based
machines (as opposed to native hotplug) are outlined in (b). There are
use cases where users would still want to use native
hotplug. Therefore, this config option enables users to choose either
ACPI based hotplug or native hotplug for bridges (for example for pcie
root port controller in q35 machines).
Qemu capability validation checks have also been added along with
related unit tests to exercise the new conf option.
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Laine Stump <laine@redhat.com>
This change introduces libvirt xml support to enable/disable hotplug on the
pci-root controller. It adds a 'target' subelement for the pci-root controller
with a 'hotplug' property. This property can be used to enable or disable
hotplug for the pci-root controller. For example, in order to disable hotplug
on the pci-root controller, one has to use set '<target hotplug='off'>' as
shown below:
<controller type='pci' model='pci-root'>
<target hotplug='off'/>
</controller>
'<target hotplug='on'>' option would enable hotplug for pci-root controller.
This is also the default value. This option is only available for pc machine
types and is applicable for qemu/kvm accelerator only.This feature was
introduced from qemu version 5.2 with the following change in qemu repository:
3d7e78aa7777f ("Introduce a new flag for i440fx to disable PCI hotplug on the root bus")
The above qemu commit describes some reasons why users might to disable hotplug
on PCI root buses.
Related unit tests to exercise the new conf option has also been added.
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>
This commit adds new memorydevices.rst page which should serve
all models of memory devices. Yet, I'm documenting virtio-mem
quirks only.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
New 'update-memory-device' command is introduced which aims on
making it user friendly to change <memory/> device. So far I just
need to change <requested/> so I'm introducing --requested-size
only; but the idea is that this is extensible for other cases
too. For instance, want to change <myElement/>? A new
--my-element argument can be easily introduced.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The virtio-mem has another property that isn't exposed yet:
current size exposed to the guest. Please note, that this is
different to <requested/> because esp. on sizing the memory
down guest may refuse to release some blocks. Therefore, let's
have another size to report in the XML. But because of its
nature, the <current/> won't be parsed and is report only (for
live XMLs).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The virtio-mem is paravirtualized mechanism of adding/removing
memory to/from a VM. A virtio-mem-pci device is split into blocks
of equal size which are then exposed (all or only a requested
portion of them) to the guest kernel to use as regular memory.
Therefore, the device has two important attributes:
1) block-size, which defines the size of a block
2) requested-size, which defines how much memory (in bytes)
is the device requested to expose to the guest.
The 'block-size' is configured on command line and immutable
throughout device's lifetime. The 'requested-size' can be set on
the command line too, but also is adjustable via monitor. In
fact, that is how management software places its requests to
change the memory allocation. If it wants to give more memory to
the guest it changes 'requested-size' to a bigger value, and if it
wants to shrink guest memory it changes the 'requested-size' to a
smaller value. Note, value of zero means that guest should
release all memory offered by the device. Of course, guest has to
cooperate. Therefore, there is a third attribute 'size' which is
read only and reflects how much memory the guest still has. This
can be different to 'requested-size', obviously. Because of name
clash, I've named it 'current' and it is dealt with in future
commits (it is a runtime information anyway).
In the backend, memory for virtio-mem is backed by usual objects:
memory-backend-{ram,file,memfd} and their size puts the cap on
the amount of memory that a virtio-mem device can offer to a
guest. But we are already able to express this info using <size/>
under <target/>.
Therefore, we need only two more elements to cover 'block-size'
and 'requested-size' attributes. This is the XML I've came up
with:
<memory model='virtio-mem'>
<source>
<nodemask>1-3</nodemask>
<pagesize unit='KiB'>2048</pagesize>
</source>
<target>
<size unit='KiB'>2097152</size>
<node>0</node>
<block unit='KiB'>2048</block>
<requested unit='KiB'>1048576</requested>
</target>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</memory>
I hope by now it is obvious that:
1) 'requested-size' must be an integer multiple of
'block-size', and
2) virtio-mem-pci device goes onto PCI bus and thus needs PCI
address.
Then there is a limitation that the minimal 'block-size' is
transparent huge page size (I'll leave this without explanation).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The value of zero is valid <unique_id/> (see
virNodeDeviceGetSCSIHostCaps()) but our RNG does not think so.
Switching the type to 'unsignedInt' does allow value of zero.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
A nodedev can have 'scsi_generic' capabilities but corresponding
RNG is missing. Fortunately, it's very simple - there's only one
mandatory child element <char/>.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The <type/> element for <capability type='scsi'> part of nodedev
XML is optional (see udevProcessSCSIDevice()) and as such might
not be formatted into nodedev XML (see
virNodeDeviceCapSCSIDefFormat()). Reflect this in our RNG.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The option "queue-size" for virtio-blk was added in qemu-2.12.0, and
default value increased from qemu-5.0.0.
However, increasing this value may lead to drop of random access
performance.
Signed-off-by: Hiroki Narukawa <hnarukaw@yahoo-corp.jp>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Add up-to-date information about creating and defining mediated devices
in libvirt.
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Bring the documentation for nodedev-list up to date with the latest
code, especially documenting the --active and -all options.
Also add documentation for the nodedev-define, nodedev-undefine, and
nodedev-start commands.
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
