[libvirt] Supporting vhost-net and macvtap in libvirt for QEMU
by Anthony Liguori
Disclaimer: I am neither an SR-IOV nor a vhost-net expert, but I've CC'd
people that are who can throw tomatoes at me for getting bits wrong :-)
I wanted to start a discussion about supporting vhost-net in libvirt.
vhost-net has not yet been merged into qemu but I expect it will be soon
so it's a good time to start this discussion.
There are two modes worth supporting for vhost-net in libvirt. The
first mode is where vhost-net backs to a tun/tap device. This is
behaves in very much the same way that -net tap behaves in qemu today.
Basically, the difference is that the virtio backend is in the kernel
instead of in qemu so there should be some performance improvement.
Current, libvirt invokes qemu with -net tap,fd=X where X is an already
open fd to a tun/tap device. I suspect that after we merge vhost-net,
libvirt could support vhost-net in this mode by just doing -net
vhost,fd=X. I think the only real question for libvirt is whether to
provide a user visible switch to use vhost or to just always use vhost
when it's available and it makes sense. Personally, I think the later
makes sense.
The more interesting invocation of vhost-net though is one where the
vhost-net device backs directly to a physical network card. In this
mode, vhost should get considerably better performance than the current
implementation. I don't know the syntax yet, but I think it's
reasonable to assume that it will look something like -net
tap,dev=eth0. The effect will be that eth0 is dedicated to the guest.
On most modern systems, there is a small number of network devices so
this model is not all that useful except when dealing with SR-IOV
adapters. In that case, each physical device can be exposed as many
virtual devices (VFs). There are a few restrictions here though. The
biggest is that currently, you can only change the number of VFs by
reloading a kernel module so it's really a parameter that must be set at
startup time.
I think there are a few ways libvirt could support vhost-net in this
second mode. The simplest would be to introduce a new tag similar to
<source network='br0'>. In fact, if you probed the device type for the
network parameter, you could probably do something like <source
network='eth0'> and have it Just Work.
Another model would be to have libvirt see an SR-IOV adapter as a
network pool whereas it handled all of the VF management. Considering
how inflexible SR-IOV is today, I'm not sure whether this is the best model.
Has anyone put any more thought into this problem or how this should be
modeled in libvirt? Michael, could you share your current thinking for
-net syntax?
--
Regards,
Anthony Liguori
1 year, 1 month
[libvirt] Libvirt multi queue support
by Naor Shlomo
Hello experts,
Could anyone please tell me if Multi Queue it fully supported in Libvirt and if so what version contains it?
Thanks,
Naor
8 years, 6 months
[libvirt] ANNOUNCE: libguestfs 1.26 released
by Richard W.M. Jones
I'm pleased to announce libguestfs 1.26, a library and set of tools
for accessing and modifying virtual machine disk images. This release
took more than 6 months of work by a considerable number of people,
and has many new features (see release notes below).
You can get libguestfs 1.26 here:
Main website: http://libguestfs.org/
Source: http://libguestfs.org/download/1.26-stable/
You will also need latest supermin from here:
http://libguestfs.org/download/supermin/
Fedora 20/21: http://koji.fedoraproject.org/koji/packageinfo?packageID=8391
It will appear as an update for F20 in about a week.
Debian/experimental coming soon, see:
https://packages.debian.org/experimental/libguestfs0
The Fedora and Debian packages have split dependencies so you can
download just the features you need.
>From http://libguestfs.org/guestfs-release-notes.1.html :
RELEASE NOTES FOR LIBGUESTFS 1.26
New features
Tools
virt-customize(1) is a new tool for customizing virtual machine disk
images. It lets you install packages, edit configuration files, run
scripts, set passwords and so on. virt-builder(1) and virt-sysprep(1)
use virt-customize, and command line options across all these tools are
now identical.
virt-diff(1) is a new tool for showing the differences between the
filesystems of two virtual machines. It is mainly useful when showing
what files have been changed between snapshots.
virt-builder(1) has been greatly enhanced. There are many more ways to
customize the virtual machine. It can pull templates from multiple
repositories. A parallelized internal xzcat implementation speeds up
template decompression. Virt-builder uses an optimizing planner to
choose the fastest way to build the VM. It is now easier to use
virt-builder from other programs. Internationalization support has been
added to metadata. More efficient SELinux relabelling of files. Can
build guests for multiple architectures. Error messages have been
improved. (Pino Toscano)
virt-sparsify(1) has a new --in-place option. This sparsifies an image
in place (without copying it) and is also much faster. (Lots of help
provided by Paolo Bonzini)
virt-sysprep(1) can delete and scrub files under user control. You can
lock user accounts or set random passwords on accounts. Can remove more
log files. Can unsubscribe a guest from Red Hat Subscription Manager.
New flexible way to enable and disable operations. (Wanlong Gao, Pino
Toscano)
virt-win-reg(1) allows you to use URIs to specify remote disk images.
virt-format(1) can now pass the extra space that it recovers back to
the host.
guestfish(1) has additional environment variables to give fine control
over the ><fs> prompt. Guestfish reads its (rarely used) configuration
file in a different order now so that local settings override global
settings. (Pino Toscano)
virt-make-fs(1) was rewritten in C, but is unchanged in terms of
functionality and command line usage.
Language bindings
The OCaml bindings have a new Guestfs.Errno module, used to check the
error number returned by Guestfs.last_errno.
PHP tests now work. (Pino Toscano)
Inspection
Inspection can recognize Debian live images.
Architectures
ARMv7 (32 bit) now supports KVM acceleration.
Aarch64 (ARM 64 bit) is supported, but the appliance part does not work
yet.
PPC64 support has been fixed and enhanced.
Security
Denial of service when inspecting disk images with corrupt btrfs
volumes
It was possible to crash libguestfs (and programs that use libguestfs
as a library) by presenting a disk image containing a corrupt btrfs
volume.
This was caused by a NULL pointer dereference causing a denial of
service, and is not thought to be exploitable any further.
See commit d70ceb4cbea165c960710576efac5a5716055486 for the fix. This
fix is included in libguestfs stable branches ≥ 1.26.0, ≥ 1.24.6 and
≥ 1.22.8, and also in RHEL ≥ 7.0. Earlier versions of libguestfs are
not vulnerable.
Better generation of random root passwords and random seeds
When generating random root passwords and random seeds, two bugs were
fixed which are possibly security related. Firstly we no longer read
excessive bytes from /dev/urandom (most of which were just thrown
away). Secondly we changed the code to avoid modulo bias. These
issues were not thought to be exploitable. (Both changes suggested by
Edwin Török)
API
GUID parameters are now validated when they are passed to API calls,
whereas previously you could have passed any string. (Pino Toscano)
New APIs
guestfs_add_drive_opts: new discard parameter
The new discard parameter allows fine-grained control over
discard/trim support for a particular disk. This allows the host file
to become more sparse (or thin-provisioned) when you delete files or
issue the guestfs_fstrim API call.
guestfs_add_domain: new parameters: cachemode, discard
These parameters are passed through when adding the domain's disks.
guestfs_blkdiscard
Discard all blocks on a guestfs device. Combined with the discard
parameter above, this makes the host file sparse.
guestfs_blkdiscardzeroes
Test if discarded blocks read back as zeroes.
guestfs_compare_*
guestfs_copy_*
For each struct returned through the API, libguestfs now generates
guestfs_compare_* and guestfs_copy_* functions to allow you to
compare and copy structs.
guestfs_copy_attributes
Copy attributes (like permissions, xattrs, ownership) from one file
to another. (Pino Toscano)
guestfs_disk_create
A flexible API for creating empty disk images from scratch. This
avoids the need to call out to external programs like qemu-img(1).
guestfs_get_backend_settings
guestfs_set_backend_settings
Per-backend settings (can also be set via the environment variable
LIBGUESTFS_BACKEND_SETTINGS). The main use for this is forcing TCG
mode in the qemu-based backends, for example:
export LIBGUESTFS_BACKEND=direct
export LIBGUESTFS_BACKEND_SETTINGS=force_tcg
guestfs_part_get_name
Get the label or name of a partition (for GPT disk images).
Build changes
The following extra packages are required to build libguestfs 1.26:
supermin ≥ 5
Supermin version 5 is required to build this version of libguestfs.
flex, bison
Virt-builder now uses a real parser to parse its metadata file, so
these tools are required.
xz
This is now a required build dependency, where previously it was (in
theory) optional.
Internals
PO message extraction rewritten to be more robust. (Pino Toscano)
podwrapper gives an error if the --insert or --verbatim argument
pattern is not found.
Libguestfs now passes the qemu -enable-fips option to enable FIPS, if
qemu supports it.
./configure --without-qemu can be used if you don't want to specify a
default hypervisor.
Copy-on-write [COW] overlays, used for example for read-only drives,
are now created through an internal backend API (.create_cow_overlay).
Libvirt backend uses some funky C macros to generate XML. These are
simpler and safer.
The ChangeLog file format has changed. It is now just the same as git
log, instead of using a custom format.
Appliance start-up has changed:
* The libguestfs appliance now initializes LVM the same way as it is
done on physical machines.
* The libguestfs appliance does not write an empty string to
/proc/sys/kernel/hotplug when starting up.
Note that you must configure your kernel to have
CONFIG_UEVENT_HELPER_PATH="" otherwise you will get strange LVM
errors (this applies as much to any Linux machine, not just
libguestfs). (Peter Rajnoha)
Libguestfs can now be built on arches that have ocamlc(1) but not
ocamlopt(1). (Hilko Bengen, Olaf Hering)
You cannot use ./configure --disable-daemon --enable-appliance. It made
no sense anyway. Now it is expressly forbidden by the configure script.
The packagelist file uses m4 for macro expansion instead of cpp.
Bugs fixed
https://bugzilla.redhat.com/1073906
java bindings inspect_list_applications2 throws
java.lang.ArrayIndexOutOfBoundsException:
https://bugzilla.redhat.com/1063374
[RFE] enable subscription manager clean or unregister operation to
sysprep
https://bugzilla.redhat.com/1060404
virt-resize does not preserve GPT partition names
https://bugzilla.redhat.com/1057504
mount-local should give a clearer error if root is not mounted
https://bugzilla.redhat.com/1056290
virt-sparsify overwrites block devices if used as output files
https://bugzilla.redhat.com/1055452
libguestfs: error: invalid backend: appliance
https://bugzilla.redhat.com/1054761
guestfs_pvs prints "unknown device" if a physical volume is missing
https://bugzilla.redhat.com/1053847
Recommended default clock/timer settings
https://bugzilla.redhat.com/1046509
ruby-libguestfs throws "expecting 0 or 1 arguments" on
Guestfs::Guestfs.new
https://bugzilla.redhat.com/1045450
Cannot inspect cirros 0.3.1 disk image fully
https://bugzilla.redhat.com/1045033
LIBVIRT_DEFAULT_URI=qemu:///system breaks libguestfs
https://bugzilla.redhat.com/1044585
virt-builder network (eg. --install) doesn't work if resolv.conf sets
nameserver 127.0.0.1
https://bugzilla.redhat.com/1044014
When SSSD is installed, libvirt configuration requires
authentication, but not clear to user
https://bugzilla.redhat.com/1039995
virt-make-fs fails making fat/vfat whole disk: Device partition
expected, not making filesystem on entire device '/dev/sda' (use -I
to override)
https://bugzilla.redhat.com/1039540
virt-sysprep to delete more logfiles
https://bugzilla.redhat.com/1033207
RFE: libguestfs inspection does not recognize Free4NAS live CD
https://bugzilla.redhat.com/1028660
RFE: virt-sysprep/virt-builder should have an option to lock a user
account
https://bugzilla.redhat.com/1026688
libguestfs fails examining libvirt guest with ceph drives: rbd: image
name must begin with a '/'
https://bugzilla.redhat.com/1022431
virt-builder fails if $HOME/.cache doesn't exist
https://bugzilla.redhat.com/1022184
libguestfs: do not use versioned jar file
https://bugzilla.redhat.com/1020806
All libguestfs LVM operations fail on Debian/Ubuntu
https://bugzilla.redhat.com/1008417
Need update helpout of part-set-gpt-type
https://bugzilla.redhat.com/953907
virt-sysprep does not correctly set the hostname on Debian/Ubuntu
https://bugzilla.redhat.com/923355
guestfish prints literal "\n" in error messages
https://bugzilla.redhat.com/660687
guestmount: "touch" command fails: touch: setting times of
`timestamp': Invalid argument
https://bugzilla.redhat.com/593511
[RFE] function to get partition name
https://bugzilla.redhat.com/563450
list-devices returns devices of different types out of order
---
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v
10 years
[libvirt] [libvirt-java] [PATCH 00/65]
by Claudio Bley
Hi.
Here are a few patches that piled up in my local branch. Some of them
I already submitted to this list, but there has been no reponse to
them.
Included are a few trivial fixes as well as memory leak fixes and
additions to the public API.
There had been some minor interest in my first version of domain event
support in the Java wrapper[1], which I have reworked almost entirely.
If nobody objects, say, within the next two weeks or so, I'll go ahead
and push the whole series as was suggested to me by Daniel P. Berrange
on this list[2].
I've made sure that all JUnit tests pass after every commit with JNA
versions 3.4.1, 3.4.2, 3.5.0, 3.5.1, 3.5.2 and 4.0.0.
I'd really appreciate your comments or suggestions.
Thanks!
[1]: https://www.redhat.com/archives/libvir-list/2013-January/msg01236.html
[2]: https://www.redhat.com/archives/libvir-list/2014-January/msg01091.html
Claudio Bley (65):
Fix warnings about using raw types
Fix warnings about accessing static methods
Fix typos in Error.java
test: fix typo in testConnection()
test: ensure that exceptions are thrown when expected
Make comments proper javadoc comments for enum constants
Ignore editor backup files
Depend on JNA versions 3.4.1 to 4.0.0
jna: load virt-0 or virt library depending on the platform
Fix wrapping of native size_t data type
Use virFree in order to release memory acquired from libvirt
tests: remove obsolete test driver
Make Device.listCapabilities return only valid array elements
test: ensure the Device.listCapabilities method works
Start refactoring of error handling
Remove processError from Device class
Remove processError from Domain class
Remove processError from DomainSnapshot class
Remove processError from Interface class
Remove processError method from Network class
Remove processError method from NetworkFilter class
Remove processError method from Secret class
Remove processError method from StoragePool class
Remove processError method from StorageVol class
Remove processError method from Stream class
Remove processError method from Connect class
Call processError only when virInitialize signalled an error
Remove ErrorHandler.processError(Libvirt) method
Implement equals and hashCode methods for Connect and Domain
Fix Domain.getSchedulerParameters / getSchedulerType
Fix memleak in Domain.snapshotListNames
Fix memleak in StoragePool.listVolumes
Fix memleak in DomainSnapshot.getXMLDesc
Fix memleak in StorageVol.getPath
Fix memleak in StorageVol.getXMLDesc
jna: Wrap the virEvent(Add,Remove)Timeout libvirt functions
Implement Connect.isAlive
Implement Connect.setKeepAlive
Introduce event loop support
Add constants for enum virDomainEventID
Prepare to define proper domain event callback support
Add constructIncRef factory method to Domain class
events: handle registration for IOError events
events: handle registration for Reboot events
events: handle registration of domain lifecycle events
test: add unit test for domain lifecycle events
events: handle registration for PMWakeup events
events: add support for PMSuspend events
Implement connection close callback support
Implement Connect.getSysinfo
Implement Domain.blockPeek
Implement Domain.memoryPeek
Implement Secret.getUsageType
Implement Domain.isUpdated
Implement Domain.reset
Implement Domain.PMwakeup
Implement Domain.sendKey
Implement interface ByteChannel for Stream class
Implement Domain.screenshot
test: add testDomainScreenshot JUnit test
Add helper for handling bit-flags
Connect: add constructors using java.net.URI params
Replace Connect.getLibVirVersion method with Library.getVersion
Replace static connectionVersion method with getLibVersion
Deprecate Connect.getHypervisorVersion
.gitignore | 2 +
pom.xml.in | 2 +-
src/main/java/org/libvirt/BitFlags.java | 18 +
src/main/java/org/libvirt/Connect.java | 731 +++++++++++++++++---
src/main/java/org/libvirt/Device.java | 57 +-
src/main/java/org/libvirt/Domain.java | 672 +++++++++++-------
src/main/java/org/libvirt/DomainSnapshot.java | 29 +-
src/main/java/org/libvirt/Error.java | 409 +++++++----
src/main/java/org/libvirt/ErrorHandler.java | 54 +-
src/main/java/org/libvirt/Interface.java | 43 +-
src/main/java/org/libvirt/KeycodeSet.java | 46 ++
src/main/java/org/libvirt/Library.java | 134 +++-
src/main/java/org/libvirt/MemoryAddressMode.java | 19 +
src/main/java/org/libvirt/Network.java | 61 +-
src/main/java/org/libvirt/NetworkFilter.java | 43 +-
src/main/java/org/libvirt/Secret.java | 72 +-
src/main/java/org/libvirt/SecretUsageType.java | 23 +
src/main/java/org/libvirt/StoragePool.java | 106 ++-
src/main/java/org/libvirt/StorageVol.java | 68 +-
src/main/java/org/libvirt/Stream.java | 232 +++++--
src/main/java/org/libvirt/SuspendTarget.java | 15 +
src/main/java/org/libvirt/event/CrashedDetail.java | 15 +
src/main/java/org/libvirt/event/DefinedDetail.java | 17 +
src/main/java/org/libvirt/event/DetailInfo.java | 5 +
src/main/java/org/libvirt/event/DomainEvent.java | 71 ++
.../java/org/libvirt/event/DomainEventDetail.java | 7 +
.../java/org/libvirt/event/DomainEventType.java | 60 ++
src/main/java/org/libvirt/event/EventListener.java | 7 +
src/main/java/org/libvirt/event/IOErrorAction.java | 39 ++
.../java/org/libvirt/event/IOErrorListener.java | 21 +
.../java/org/libvirt/event/LifecycleListener.java | 24 +
.../java/org/libvirt/event/PMSuspendListener.java | 17 +
.../java/org/libvirt/event/PMSuspendReason.java | 5 +
.../java/org/libvirt/event/PMSuspendedDetail.java | 15 +
.../java/org/libvirt/event/PMWakeupListener.java | 17 +
.../java/org/libvirt/event/PMWakeupReason.java | 5 +
.../java/org/libvirt/event/RebootListener.java | 15 +
src/main/java/org/libvirt/event/ResumedDetail.java | 20 +
.../java/org/libvirt/event/ShutdownDetail.java | 12 +
src/main/java/org/libvirt/event/StartedDetail.java | 30 +
src/main/java/org/libvirt/event/StoppedDetail.java | 40 ++
.../java/org/libvirt/event/SuspendedDetail.java | 40 ++
.../java/org/libvirt/event/UndefinedDetail.java | 7 +
src/main/java/org/libvirt/jna/Libvirt.java | 121 +++-
src/main/java/org/libvirt/jna/SizeT.java | 19 +
.../java/org/libvirt/jna/SizeTByReference.java | 50 ++
src/main/java/org/libvirt/jna/virConnectAuth.java | 4 +-
.../java/org/libvirt/jna/virConnectCredential.java | 4 +-
.../java/org/libvirt/jna/virDomainBlockInfo.java | 4 +-
.../java/org/libvirt/jna/virDomainBlockStats.java | 4 +-
src/main/java/org/libvirt/jna/virDomainInfo.java | 4 +-
.../org/libvirt/jna/virDomainInterfaceStats.java | 4 +-
.../java/org/libvirt/jna/virDomainJobInfo.java | 4 +-
.../java/org/libvirt/jna/virDomainMemoryStats.java | 4 +-
src/main/java/org/libvirt/jna/virError.java | 4 +-
src/main/java/org/libvirt/jna/virNodeInfo.java | 4 +-
.../java/org/libvirt/jna/virSchedParameter.java | 4 +-
.../java/org/libvirt/jna/virStoragePoolInfo.java | 4 +-
.../java/org/libvirt/jna/virStorageVolInfo.java | 4 +-
src/main/java/org/libvirt/jna/virVcpuInfo.java | 4 +-
src/test/java/org/libvirt/TestJavaBindings.java | 139 +++-
src/test/java/org/libvirt/TestLibvirtGlobals.java | 4 +
src/test/java/test.java | 280 --------
63 files changed, 2807 insertions(+), 1187 deletions(-)
create mode 100644 src/main/java/org/libvirt/BitFlags.java
create mode 100644 src/main/java/org/libvirt/KeycodeSet.java
create mode 100644 src/main/java/org/libvirt/MemoryAddressMode.java
create mode 100644 src/main/java/org/libvirt/SecretUsageType.java
create mode 100644 src/main/java/org/libvirt/SuspendTarget.java
create mode 100644 src/main/java/org/libvirt/event/CrashedDetail.java
create mode 100644 src/main/java/org/libvirt/event/DefinedDetail.java
create mode 100644 src/main/java/org/libvirt/event/DetailInfo.java
create mode 100644 src/main/java/org/libvirt/event/DomainEvent.java
create mode 100644 src/main/java/org/libvirt/event/DomainEventDetail.java
create mode 100644 src/main/java/org/libvirt/event/DomainEventType.java
create mode 100644 src/main/java/org/libvirt/event/EventListener.java
create mode 100644 src/main/java/org/libvirt/event/IOErrorAction.java
create mode 100644 src/main/java/org/libvirt/event/IOErrorListener.java
create mode 100644 src/main/java/org/libvirt/event/LifecycleListener.java
create mode 100644 src/main/java/org/libvirt/event/PMSuspendListener.java
create mode 100644 src/main/java/org/libvirt/event/PMSuspendReason.java
create mode 100644 src/main/java/org/libvirt/event/PMSuspendedDetail.java
create mode 100644 src/main/java/org/libvirt/event/PMWakeupListener.java
create mode 100644 src/main/java/org/libvirt/event/PMWakeupReason.java
create mode 100644 src/main/java/org/libvirt/event/RebootListener.java
create mode 100644 src/main/java/org/libvirt/event/ResumedDetail.java
create mode 100644 src/main/java/org/libvirt/event/ShutdownDetail.java
create mode 100644 src/main/java/org/libvirt/event/StartedDetail.java
create mode 100644 src/main/java/org/libvirt/event/StoppedDetail.java
create mode 100644 src/main/java/org/libvirt/event/SuspendedDetail.java
create mode 100644 src/main/java/org/libvirt/event/UndefinedDetail.java
create mode 100644 src/main/java/org/libvirt/jna/SizeT.java
create mode 100644 src/main/java/org/libvirt/jna/SizeTByReference.java
delete mode 100644 src/test/java/test.java
--
1.7.9.5
10 years, 1 month
[libvirt] [PATCH 0/2] esx: Add libcurl based stream driver and implement virDomainScreenshot
by Matthias Bolte
I had the code in these two patches bascially sitting around since 2012,
yes 2012! But I never managed to get the code properly split into patches
and touched up good enough to post it here. This was also hindered by the
fact that I had no ESX test system at hand for the last year or so.
Dawid Zamirski posted some patches [1] to implement virDomainScreenshot
for ESX. So I finally managed to set up some ESX test system again this
weekend and get my old code dusted up. His implementation has two
disadvantages, namely storing the screenshot to a temporary file before
feeding it to a stream and the method of creating the screenshot itself
is availalbe since ESX 4.0 only.
My implementation direcly feeds the screenshot data to a stream and
screenshot creation uses a method available since ESX 2.5.
[1] https://www.redhat.com/archives/libvir-list/2014-March/msg01786.html
10 years, 2 months
[libvirt] [PATCH v2] Added example script on how to convert LXC container config
by Cédric Bosdonnat
---
Makefile.am | 2 +-
configure.ac | 1 +
examples/lxcconvert/Makefile.am | 18 ++++++
examples/lxcconvert/virt-lxc-convert | 108 +++++++++++++++++++++++++++++++++++
4 files changed, 128 insertions(+), 1 deletion(-)
create mode 100644 examples/lxcconvert/Makefile.am
create mode 100644 examples/lxcconvert/virt-lxc-convert
diff --git a/Makefile.am b/Makefile.am
index 9847ff0..0ef983f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ SUBDIRS = . gnulib/lib include src daemon tools docs gnulib/tests \
tests po examples/object-events examples/hellolibvirt \
examples/dominfo examples/domsuspend examples/apparmor \
examples/xml/nwfilter examples/openauth examples/systemtap \
- tools/wireshark
+ examples/lxcconvert tools/wireshark
ACLOCAL_AMFLAGS = -I m4
diff --git a/configure.ac b/configure.ac
index 73efffa..f84d4bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2699,6 +2699,7 @@ AC_CONFIG_FILES([\
examples/hellolibvirt/Makefile \
examples/systemtap/Makefile \
examples/xml/nwfilter/Makefile \
+ examples/lxcconvert/Makefile \
tools/wireshark/Makefile \
tools/wireshark/src/Makefile])
AC_OUTPUT
diff --git a/examples/lxcconvert/Makefile.am b/examples/lxcconvert/Makefile.am
new file mode 100644
index 0000000..09cf5d9
--- /dev/null
+++ b/examples/lxcconvert/Makefile.am
@@ -0,0 +1,18 @@
+## Copyright (C) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
+##
+## This library is free software; you can redistribute it and/or
+## modify it under the terms of the GNU Lesser General Public
+## License as published by the Free Software Foundation; either
+## version 2.1 of the License, or (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public
+## License along with this library. If not, see
+## <http://www.gnu.org/licenses/>.
+
+EXTRA_DIST= \
+ virt-lxc-convert
diff --git a/examples/lxcconvert/virt-lxc-convert b/examples/lxcconvert/virt-lxc-convert
new file mode 100644
index 0000000..a6c5721
--- /dev/null
+++ b/examples/lxcconvert/virt-lxc-convert
@@ -0,0 +1,108 @@
+#!/bin/sh
+
+handler_cleanup()
+{
+ if ! test -z "$conf_dir"; then
+ # Remove the temporary config
+ rm -r "$conf_dir"
+ fi
+}
+trap handler_cleanup INT EXIT
+
+show_help()
+{
+ cat << EOF
+$0 /path/to/lxc/config/file
+
+Wrapper around virsh domxml-from-native to ease conversion of LXC
+containers configuration to libvirt domain XML.
+EOF
+}
+
+if test $# != 1; then
+ show_help
+ exit 1
+fi
+
+if test "$1" = "--help" || test "$1" = "-h"; then
+ show_help
+ exit $?
+fi
+
+conf=$1
+
+conf_dir=$(mktemp --tmpdir -d virt-lxc-convert-XXX)
+conf_new=$conf_dir/config
+
+cp "$conf" "$conf_new"
+
+# Do we have lxc.mount, and is it pointing to a readable file?
+fstab=$(sed -n '/lxc.mount[[:space:]]*=/ s/[[:space:]]*=[[:space:]]*/=/p' \
+ "$conf_new" | cut -f 2 -d '=')
+if test -n "$fstab" && test -r "$fstab"; then
+ sed 's/^lxc.mount[[:space:]]*=.*$//' "$conf_new" >"${conf_new}.tmp"
+ mv "${conf_new}.tmp" "${conf_new}"
+ sed 's/^\([^#]\)/lxc.mount.entry = \1/' "$fstab" >>"${conf_new}"
+fi
+
+memory=$(free | sed -n '/Mem:/s/ \+/ /gp' | cut -f 2 -d ' ')
+default_tmpfs="size=$((memory/2))"
+
+# Do we have tmpfs without size param?
+lineno=0
+while read line; do
+ lineno=$(expr $lineno + 1)
+ has_rel_size=false
+ case $line in
+ lxc.mount.entry[[:space:]]*=[[:space:]]*tmpfs[[:space:]]*)
+ is_tmpfs=true
+ ;;
+ *)
+ is_tmpfs=false
+ ;;
+ esac
+
+ # We only care about tmpfs mount entries here
+ if ! $is_tmpfs; then
+ continue
+ fi
+
+ case $line in
+ *size=[0-9][0-9]*%*)
+ has_rel_size=true
+ has_size=true
+ ;;
+ *size=*)
+ has_size=true
+ ;;
+ *)
+ has_size=false
+ ;;
+ esac
+
+ # Add the default size here (50%) if no size is given
+ if ! $has_size; then
+ last_option_match="\([[:space:]]*[0-9][[:space:]]*[0-9][::space::]*$\)"
+ sed "${lineno}s/$last_option_match/,$default_tmpfs\1/" \
+ "$conf_new" >"${conf_new}.tmp"
+ mv "${conf_new}.tmp" "${conf_new}"
+ fi
+
+ # Convert relative sizes
+ if $has_rel_size; then
+ percent=$(echo "$line" | sed 's/.*size=\([0-9][0-9]*\)%.*/\1/')
+ size="$((memory*percent/100))"
+ sed "${lineno}s/size=[0-9]*%/size=${size}/" \
+ "$conf_new" >"${conf_new}.tmp"
+ mv "${conf_new}.tmp" "${conf_new}"
+ fi
+done < "$conf_new"
+
+# Do we have any memory limit set?
+mem_limit=$(grep 'lxc.cgroup.memory.limit_in_bytes[[:space:]]*=' $conf_new)
+if test -z "$mem_limit"; then
+ echo "lxc.cgroup.memory.limit_in_bytes = $memory" >> "$conf_new"
+fi
+
+virsh -c lxc:/// domxml-from-native lxc-tools $conf_new
+exit $?
--
1.8.4.5
10 years, 6 months
[libvirt] lxc: shutdown $domain broken in 1.2.2
by Stephan Sachse
host: centos-6.5
kernel: 3.13.2-4.el6.x86_64
guest: fedora20
since libvirt-1.2.2 i can not shutdown this domain. works fine with
libvirt-1.2.1
# virsh shutdown fedora2
error: Failed to shutdown domain fedora2
error: Mount namespaces are not available on this platform: Function
not implemented
from the logfile: 14478: error : virProcessRunInMountNamespace:982 :
Mount namespaces are not available on this platform: Function not
implemented
the buildhost for the rpm is a centos-6.5 system with kernel 3.1.8
(dont ask! its a vserver system) and the test for "setns" failed
configure:9592: checking for setns
configure:9592: gcc -std=gnu99 -o conftest -g -O2 conftest.c >&5
/tmp/cchlir6v.o: In function `main':
/builddir/build/BUILD/libvirt-1.2.2/conftest.c:184: undefined
reference to `setns'
collect2: ld returned 1 exit status
setns() was added in glibc-2.14 centos6 has glibc-2.12
attached is a fix for this problem.
stolen from: http://cgit.freedesktop.org/systemd/systemd/commit/src/shared/missing.h?i...
/stephan
--
Software is like sex, it's better when it's free!
10 years, 7 months
[libvirt] [RFC PATCH v2 0/3] qemu: RDMA live migration support
by mrhines＠linux.vnet.ibm.com
From: "Michael R. Hines" <mrhines(a)us.ibm.com>
Changes since v1:
1. This series uses 'rdma' instead of 'x-rdma', even though QEMU
has has not yet renamed URI for live migraiton yet, but this
series is just an RFC, so at least we can get some agreement.
2. We've fixed the job stats to be in the right place instead
of breaking the hard-coded api.
Michael R. Hines (3):
qemu: Expose additional timing metrics for 'setup' and 'mbps'
qemu: RDMA migration support using 'rdma' URI
qemu: memory pre-pinning support for RDMA migration
include/libvirt/libvirt.h.in | 16 ++++
src/qemu/qemu_capabilities.c | 13 ++++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 8 ++
src/qemu/qemu_driver.c | 14 ++++
src/qemu/qemu_migration.c | 174 +++++++++++++++++++++++++++++++++++++------
src/qemu/qemu_migration.h | 3 +-
src/qemu/qemu_monitor.c | 5 +-
src/qemu/qemu_monitor.h | 14 ++++
src/qemu/qemu_monitor_json.c | 8 ++
src/util/viruri.c | 7 +-
tools/virsh-domain.c | 7 ++
12 files changed, 244 insertions(+), 26 deletions(-)
--
1.8.1.2
10 years, 8 months
[libvirt] [PATCH] add flag to enforce hugepage backing of guest RAM
by Marcelo Tosatti
Add an element named "strict-hugepages" to control whether to
refuse guest initialization in case hugepage allocation cannot
be performed.
Signed-off-by: Marcelo Tosatti <mtosatti(a)redhat.com>
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index ff50214..e79f5e6 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -632,6 +632,9 @@
<dt><code>hugepages</code></dt>
<dd>This tells the hypervisor that the guest should have its memory
allocated using hugepages instead of the normal native page size.</dd>
+ <dt><code>strict-hugepages</code></dt>
+ <dd>This tells the hypervisor that the guest should refuse to start
+ in case of failure to allocate guest memory with hugepages</dd>
<dt><code>nosharepages</code></dt>
<dd>Instructs hypervisor to disable shared pages (memory merge, KSM) for
this domain. <span class="since">Since 1.0.6</span></dd>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 28e24f9..f16ef0b 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -11226,6 +11226,9 @@ virDomainDefParseXML(xmlDocPtr xml,
if (virXPathBoolean("boolean(./memoryBacking/locked)", ctxt))
def->mem.locked = true;
+ if ((node = virXPathNode("./memoryBacking/stricthugepages", ctxt)))
+ def->mem.strict_hugepages = true;
+
/* Extract blkio cgroup tunables */
if (virXPathUInt("string(./blkiotune/weight)", ctxt,
&def->blkio.weight) < 0)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index d8f2e49..8ea5cf0 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1977,6 +1977,7 @@ struct _virDomainDef {
unsigned long long max_balloon; /* in kibibytes */
unsigned long long cur_balloon; /* in kibibytes */
bool hugepage_backed;
+ bool strict_hugepages;
bool nosharepages;
bool locked;
int dump_core; /* enum virDomainMemDump */
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 96b8825..3f8d0a4 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -12133,10 +12133,9 @@ cleanup:
return def;
}
-
-static int qemuParseProcFileStrings(int pid_value,
- const char *name,
- char ***list)
+int qemuParseProcFileStrings(int pid_value,
+ const char *name,
+ char ***list)
{
char *path = NULL;
int ret = -1;
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index de7683d..bcdfefa 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -226,7 +226,9 @@ virDomainDefPtr qemuParseCommandLinePid(virCapsPtr qemuCaps,
char **pidfile,
virDomainChrSourceDefPtr *monConfig,
bool *monJSON);
-
+int qemuParseProcFileStrings(int pid_value,
+ const char *name,
+ char ***list);
int qemuDomainAssignAddresses(virDomainDefPtr def,
virQEMUCapsPtr qemuCaps,
virDomainObjPtr obj)
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 8bcd98e..cb8298e 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -25,6 +25,7 @@
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>
+#include <stdlib.h>
#if defined(__linux__)
# include <linux/capability.h>
#elif defined(__FreeBSD__)
@@ -3507,6 +3508,95 @@ error:
}
+/*
+ * Returns bool: whether to fail guest initialization.
+ *
+ */
+static bool qemuValidateStrictHugepage(virDomainObjPtr vm, virQEMUDriverConfigPtr cfg)
+{
+ bool ret = false;
+ char **maps = NULL;
+ int i;
+ char *buf;
+
+ if (!vm->def->mem.strict_hugepages)
+ return ret;
+
+ ret = true;
+
+ if (!vm->def->mem.hugepage_backed || !cfg->hugepagePath) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("strict huge pages depends on huge pages"));
+ return ret;
+ }
+
+ buf = malloc(strlen(cfg->hugepagePath) + 50);
+
+ /* The parser requires /proc/pid, which only exists on platforms
+ * like Linux where pid_t fits in int. */
+ if ((int) vm->pid != vm->pid ||
+ qemuParseProcFileStrings(vm->pid, "maps", &maps) < 0)
+ goto cleanup;
+
+ for (i = 0; maps && maps[i]; i++) {
+ char *endptr;
+ unsigned long start, end;
+ const char *map = maps[i];
+ bool found = false;
+
+ sprintf(buf, "%s/qemu_back_mem.pc.ram.", cfg->hugepagePath);
+ if (strstr(map,buf) != NULL)
+ found = true;
+
+ sprintf(buf, "%s/kvm.", cfg->hugepagePath);
+ if (strstr(map,buf) != NULL)
+ found = true;
+
+ if (!found)
+ continue;
+
+ errno = 0;
+ start = strtol(map, &endptr, 16);
+ if ((errno == ERANGE && (start == LONG_MAX || start == LONG_MIN))
+ || (errno != 0 && start == 0)) {
+ continue;
+ }
+
+ if (endptr && *endptr == '-')
+ endptr++;
+
+ if (!*endptr)
+ continue;
+
+ errno = 0;
+ end = strtol(endptr, NULL, 16);
+ if ((errno == ERANGE && (end == LONG_MAX || end == LONG_MIN))
+ || (errno != 0 && end == 0)) {
+ continue;
+ }
+
+ if (end-start >= vm->def->mem.max_balloon * 1024) {
+ ret = false;
+ break;
+ }
+ }
+
+ if (ret) {
+ /* FIXME: is VIR_ERR_NO_MEMORY to be used exclusively
+ * to reference libvirt allocation failures?
+ */
+ virReportError(VIR_ERR_NO_MEMORY, "%s",
+ _("guest memory not hugetlbfs backed"));
+ }
+
+cleanup:
+ for (i = 0; maps && maps[i]; i++)
+ VIR_FREE(maps[i]);
+ free(buf);
+ return ret;
+}
+
+
static bool
qemuValidateCpuMax(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
{
@@ -4071,6 +4161,13 @@ int qemuProcessStart(virConnectPtr conn,
goto cleanup;
}
+ /* enforce strict hugepage */
+ if (qemuValidateStrictHugepage(vm, cfg)) {
+ VIR_WARN("Failure to allocate hugepage backing for %s, exiting",
+ vm->def->name);
+ goto cleanup;
+ }
+
/* set default link states */
/* qemu doesn't support setting this on the command line, so
* enter the monitor */
10 years, 8 months
