Commit Graph

18 Commits

Author SHA1 Message Date
Michal Privoznik
c8238579fb lib: Drop internal virXXXPtr typedefs
Historically, we declared pointer type to our types:

  typedef struct _virXXX virXXX;
  typedef virXXX *virXXXPtr;

But usefulness of such declaration is questionable, at best.
Unfortunately, we can't drop every such declaration - we have to
carry some over, because they are part of public API (e.g.
virDomainPtr). But for internal types - we can do drop them and
use what every other C project uses 'virXXX *'.

This change was generated by a very ugly shell script that
generated sed script which was then called over each file in the
repository. For the shell script refer to the cover letter:

https://listman.redhat.com/archives/libvir-list/2021-March/msg00537.html

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
2021-04-13 17:00:38 +02:00
Daniel P. Berrangé
99a1cfc438 qemu: honour fatal errors dealing with qemu slirp helper
Currently all errors from qemuInterfacePrepareSlirp() are completely
ignored by the callers. The intention is that missing qemu-slirp binary
should cause the caller to fallback to the built-in slirp impl.

Many of the possible errors though should indeed be considered fatal.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-10-27 12:03:19 +00:00
Jonathon Jongsma
0b1a05ffb5 qemu: add vdpa support
Enable <interface type='vdpa'> for qemu domains. This provides basic
support and does not support hotplug or migration.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>
2020-10-20 14:48:02 -04:00
Daniel P. Berrangé
ba6d9264c6 src: add G_GNUC_NO_INLINE annotations for mocked symbols
We should prevent inlining of symbols from the driver .so files that are
mocked, as well as those in the main libvirt.so

This isn't fixing any currently known problem, just trying to prevent
future issues.

Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-08-04 17:58:08 +01:00
Marc-André Lureau
9145b3f1cc qemu-process: prepare slirp-helper
When the network interface is of "user" type, and QEMU has the "-net
socket,fd=" datagram support, call qemuInterfacePrepareSlirp() to
probe and associate a slirp-helper with the interface.

The usage of automated slirp-helper can be prevented with
disableSlirp (in particular when resuming a
VM that didn't start with slirp-helper before).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2019-09-06 12:47:47 +02:00
Jonathon Jongsma
5dad4b5d93 src/qemu: use #pragma once in headers
Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
2019-06-19 17:12:30 +02:00
Daniel P. Berrangé
568a417224 Enforce a standard header file guard symbol name
Require that all headers are guarded by a symbol named

  LIBVIRT_$FILENAME

where $FILENAME is the uppercased filename, with all characters
outside a-z changed into '_'.

Note we do not use a leading __ because that is technically a
namespace reserved for the toolchain.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-14 10:47:13 +00:00
Daniel P. Berrangé
600462834f Remove all Author(s): lines from source file headers
In many files there are header comments that contain an Author:
statement, supposedly reflecting who originally wrote the code.
In a large collaborative project like libvirt, any non-trivial
file will have been modified by a large number of different
contributors. IOW, the Author: comments are quickly out of date,
omitting people who have made significant contribitions.

In some places Author: lines have been added despite the person
merely being responsible for creating the file by moving existing
code out of another file. IOW, the Author: lines give an incorrect
record of authorship.

With this all in mind, the comments are useless as a means to identify
who to talk to about code in a particular file. Contributors will always
be better off using 'git log' and 'git blame' if they need to  find the
author of a particular bit of code.

This commit thus deletes all Author: comments from the source and adds
a rule to prevent them reappearing.

The Copyright headers are similarly misleading and inaccurate, however,
we cannot delete these as they have legal meaning, despite being largely
inaccurate. In addition only the copyright holder is permitted to change
their respective copyright statement.

Reviewed-by: Erik Skultety <eskultet@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-12-13 16:08:38 +00:00
Ján Tomko
c1f684eac1 qemu: deprecate QEMU_CAPS_VHOST_NET
Implied by QEMU >= 1.2.0.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
2018-04-16 15:00:26 +02:00
Laine Stump
77780a29ed Revert "qemu: propagate bridge MTU into qemu "host_mtu" option"
This reverts commit 2841e675.

It turns out that adding the host_mtu field to the PCI capabilities in
the guest bumps the length of PCI capabilities beyond the 32 byte
boundary, so the virtio-net device gets 64 bytes of ioport space
instead of 32, which offsets the address of all the other following
devices. Migration doesn't work very well when the location and length
of PCI capabilities of devices is changed between source and
destination.

This means that we need to make sure that the absence/presence of
host_mtu on the qemu commandline always matches between source and
destination, which means that we need to make setting of host_mtu an
opt-in thing (it can't happen automatically when the bridge being used
has a non-default MTU, which is what commit 2841e675 implemented).

I do want to re-implement this feature with an <mtu auto='on'/>
setting, but probably won't backport that to any stable branches, so
I'm first reverting the original commit, and that revert can be pushed
to the few releases that have been made since the original (3.1.0 -
3.3.0)

Resolves: https://bugzilla.redhat.com/1449346
2017-05-22 12:57:34 -04:00
Laine Stump
2841e6756d qemu: propagate bridge MTU into qemu "host_mtu" option
libvirt was able to set the host_mtu option when an MTU was explicitly
given in the interface config (with <mtu size='n'/>), set the MTU of a
libvirt network in the network config (with the same named
subelement), and would automatically set the MTU of any tap device to
the MTU of the network.

This patch ties that all together (for networks based on tap devices
and either Linux host bridges or OVS bridges) by learning the MTU of
the network (i.e. the bridge) during qemuInterfaceBridgeConnect(), and
returning that value so that it can then be passed to
qemuBuildNicDevStr(); qemuBuildNicDevStr() then sets host_mtu in the
interface's commandline options.

The result is that a higher MTU for all guests connecting to a
particular network will be plumbed top to bottom by simply changing
the MTU of the network (in libvirt's config for libvirt-managed
networks, or directly on the bridge device for simple host bridges or
OVS bridges managed outside of libvirt).

One question I have about this - it occurred to me that in the case of
migrating a guest from a host with an older libvirt to one with a
newer libvirt, the guest may have *not* had the host_mtu option on the
older machine, but *will* have it on the newer machine. I'm curious if
this could lead to incompatibilities between source and destination (I
guess it all depends on whether or not the setting of host_mtu has a
practical effect on a guest that is already running - Maxime?)

Likewise, we could run into problems when migrating from a newer
libvirt to older libvirt - The guest would have been told of the
higher MTU on the newer libvirt, then migrated to a host that didn't
understand <mtu size='blah'/>. (If this really is a problem, it would
be a problem with or without the current patch).
2017-02-07 14:02:19 -05:00
Nitesh Konkar
4f405ebd1d qemu: Fix indentation in qemu_interface.h
Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
2017-02-01 09:27:48 +01:00
Vasiliy Tolstov
9c17d665fd autocreate tap device for ethernet network type
If a user specify network type ethernet, then create it via libvirt and run
script if it provided. After this commit user does not need to
run external script to create tap device or add root permissions to qemu
process.

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
2016-03-23 11:37:59 +00:00
John Ferlan
7edf0e5ef8 qemu: Move and rename qemuOpenVhostNet
Move function to qemu_interface.c and rename to qemuInterfaceOpenVhostNet

Signed-off-by: John Ferlan <jferlan@redhat.com>
2016-02-16 11:07:47 -05:00
John Ferlan
a1a1e44798 qemu: Move qemuNetworkIfaceConnect to qemu_interface.c and rename
Move the misplaced function from qemu_command.c to qemu_interface.c
since it's closer in functionality there and had less to do with building
the command line.

Rename function to qemuInterfaceBridgeConnect and modify callers.

Signed-off-by: John Ferlan <jferlan@redhat.com>
2016-02-16 11:07:47 -05:00
John Ferlan
5937241328 qemu: Move qemuPhysIfaceConnect to qemu_interface.c and rename
Move the misplaced function from qemu_command.c to qemu_interface.c
since it's closer in functionality there and had less to do with building
the command line.

Rename function to qemuInterfaceDirectConnect and modify callers.

Signed-off-by: John Ferlan <jferlan@redhat.com>
2016-02-16 11:07:47 -05:00
Laine Stump
c5a54917d5 qemu: add a qemuInterfaceStopDevices(), called when guest CPUs stop
We now have a qemuInterfaceStartDevices() which does the final
activation needed for the host-side tap/macvtap devices that are used
for qemu network connections. It will soon make sense to have the
converse qemuInterfaceStopDevices() which will undo whatever was done
during qemuInterfaceStartDevices().

A function to "stop" a single device has also been added, and is
called from the appropriate place in qemuDomainDetachNetDevice(),
although this is currently unnecessary - the device is going to
immediately be deleted anyway, so any extra "deactivation" will be for
naught. The call is included for completeness, though, in anticipation
that in the future there may be some required action that *isn't*
nullified by deleting the device.

This patch is a part of a more complete fix for:

  https://bugzilla.redhat.com/show_bug.cgi?id=1081461
2014-12-13 22:20:28 -05:00
Matthew Rosato
82977058f5 network: Bring netdevs online later
Currently, MAC registration occurs during device creation, which is
early enough that, during live migration, you end up with duplicate
MAC addresses on still-running source and target devices, even though
the target device isn't actually being used yet.
This patch proposes to defer MAC registration until right before
the guest can actually use the device -- In other words, right
before starting guest CPUs.

Signed-off-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Laine Stump <laine@laine.org>
2014-12-10 15:09:01 -05:00