[libvirt] [PATCH] Fix python error reporting for some storage operations
by Cole Robinson
In the python bindings, all vir* classes expect to be
passed a virConnect object when instantiated. Before
the storage stuff, these classes were only instantiated
in virConnect methods, so the generator is hardcoded to
pass 'self' as the connection instance to these classes.
Problem is there are some methods that return pool or vol
instances which aren't called from virConnect: you can
lookup a storage volume's associated pool, and can lookup
volumes from a pool. In these cases passing 'self' doesn't
give the vir* instance a connection, so when it comes time
to raise an exception crap hits the fan.
Rather than rework the generator to accomodate this edge
case, I just fixed the init functions for virStorage* to
pull the associated connection out of the passed value
if it's not a virConnect instance.
Thanks,
Cole
diff --git a/python/generator.py b/python/generator.py
index 01a17da..c706b19 100755
--- a/python/generator.py
+++ b/python/generator.py
@@ -962,8 +962,12 @@ def buildWrappers():
list = reference_keepers[classname]
for ref in list:
classes.write(" self.%s = None\n" % ref[1])
- if classname in [ "virDomain", "virNetwork", "virStoragePool", "virStorageVol" ]:
+ if classname in [ "virDomain", "virNetwork" ]:
classes.write(" self._conn = conn\n")
+ elif classname in [ "virStorageVol", "virStoragePool" ]:
+ classes.write(" self._conn = conn\n" + \
+ " if not isinstance(conn, virConnect):\n" + \
+ " self._conn = conn._conn\n")
classes.write(" if _obj != None:self._o = _obj;return\n")
classes.write(" self._o = None\n\n");
destruct=None
1 month, 3 weeks
[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, 6 months
[libvirt] Bump tar format?
by Andrea Bolognani
Hi everyone,
commit cc3d52e[1] has apparently broken 'make dist' for at least some
platforms: Fedora 20 is fine[2], but both Fedora 21 and rawhide[3][4]
are currently failing. My laptop is running Fedora 22 and can make
dist just fine, which is of course very confusing.
The issue is caused by the following tar error:
tar: libvirt-1.2.18/tests/nodeinfodata/linux-deconfigured-cpus/ \
node/node0/cpu16/topology/core_siblings_list: \
link name is too long; not dumped
There seem to be basically two ways to solve the failure:
1. rename the test case, making it shorter;
2. bump tar format from ustar, which has limitations on the length
of file names, to posix/pax, which has no such limitations.
I'm not a fan of the former option because short names are usually very
opaque, see tests/nodeinfodata/linux-test[0-8] for some perfect
examples.
On the other hand, I'm not sure whether bumping the tar version would
affect portability in a significant way: the automake documentation[5]
reports that
this format is very young and should probably be restricted to
packages that target only very modern platforms
but the GNU tar documentation[6], while containing some warnings as
well, suggest that this format is going to become the default.
Any suggestions on how to proceed?
Cheers.
[1] https://www.redhat.com/archives/libvir-list/2015-July/msg00662.html
[2] https://ci.centos.org/view/libvirt-project/job/libvirt-daemon
-rpm/systems=libvirt-fedora-20/327/
[3] https://ci.centos.org/view/libvirt-project/job/libvirt-daemon
-rpm/systems=libvirt-fedora-21/327/
[4] https://ci.centos.org/view/libvirt-project/job/libvirt-daemon
-rpm/systems=libvirt-fedora-rawhide/327/
[5] https://www.gnu.org/software/automake/manual/html_node/List-of
-Automake-options.html
[6] http://www.gnu.org/software/tar/manual/html_chapter/tar_8.html
--
Andrea Bolognani
Software Engineer - Virtualization Team
8 years, 10 months
[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, 10 months
[libvirt] [PATCH/RFC] Add missing delta from Ubuntu to apparmor profiles
by Stefan Bader
This had been on the Debian package list before but its time to take
this onwards. So the goal would be to have one set to rule them all
(when using apparmor) and drop the seperate set of definitions which
exist at least in the Ubuntu packaging.
Right now the patch would be at a state which adds all missing files
and rules to the current examples in libvirt and installs them when
using --with-apparmor-profiles.
One problem seems to be that some of the definitions might cause
parse failures on certain versions of apparmor. I checked this morning
and this looks a bit hairy. So some apparmor 2.8 versions potentially
have issues, but not all apparmor 2.8 are the same (gah).
I could imagine (but John, we really could use some guidance here ;))
that at least some changes could be related to version 2.8.95~2430:
+ debian/patches/mediate-signals.patch,
debian/patches/change-signal-syntax.patch: Parse signal rules with
apparmor_parser. See the apparmor.d(5) man page for syntax details.
+ debian/patches/change-ptrace-syntax.patch,
debian/patches/mediate-ptrace.patch: Parse ptrace rules with
apparmor_parser. See the apparmor.d(5) man page for syntax details.
But, regardless of the when, the apparmor rules maybe need a way to handle
versioned features of the parser. One proposal was to comment out problematic
rules and allow the packager to re-enable things. Maybe going one step
further and have some pre-processing that handles version based sections
(like #if (APPARMOR_VERSION >= xxx)).
So that is where we stand. Ideas are very welcome.
-Stefan
---
>From aec5cf8cc30c80492a37856626264c3d4c27a31f Mon Sep 17 00:00:00 2001
From: Stefan Bader <stefan.bader(a)canonical.com>
Date: Thu, 18 Sep 2014 14:15:17 +0200
Subject: [PATCH] Add missing delta from Ubuntu to apparmor profiles
This fixes up the upstream profiles and would allow to drop apparmor
related delta from the Ubuntu package.
Thanks to Serge Hallyn for the Makefile.am install hook that allows
to rename the local file.
Signed-off-by: Stefan Bader <stefan.bader(a)canonical.com>
---
examples/apparmor/Makefile.am | 10 ++++++++
examples/apparmor/libvirt-lxc | 15 +++++++++++-
examples/apparmor/libvirt-qemu | 31 +++++++++++++++++++++++-
examples/apparmor/local-usr.sbin.libvirtd | 2 ++
examples/apparmor/usr.lib.libvirt.virt-aa-helper | 25 ++++++++++++++++---
examples/apparmor/usr.sbin.libvirtd | 17 ++++++++++++-
6 files changed, 94 insertions(+), 6 deletions(-)
create mode 100644 examples/apparmor/local-usr.sbin.libvirtd
diff --git a/examples/apparmor/Makefile.am b/examples/apparmor/Makefile.am
index 7a20e16..aa46cb9 100644
--- a/examples/apparmor/Makefile.am
+++ b/examples/apparmor/Makefile.am
@@ -20,6 +20,7 @@ EXTRA_DIST= \
libvirt-qemu \
libvirt-lxc \
usr.lib.libvirt.virt-aa-helper \
+ local-usr.sbin.libvirtd \
usr.sbin.libvirtd
if WITH_APPARMOR_PROFILES
@@ -29,6 +30,15 @@ apparmor_DATA = \
usr.sbin.libvirtd \
$(NULL)
+localdir = $(apparmordir)/local
+local_DATA = \
+ local-usr.sbin.libvirtd \
+ $(NULL)
+
+install-data-hook:
+ mv $(DESTDIR)$(localdir)/local-usr.sbin.libvirtd \
+ $(DESTDIR)$(localdir)/usr.sbin.libvirtd
+
abstractionsdir = $(apparmordir)/abstractions
abstractions_DATA = \
libvirt-qemu \
diff --git a/examples/apparmor/libvirt-lxc b/examples/apparmor/libvirt-lxc
index 4bfb503..4705e0a 100644
--- a/examples/apparmor/libvirt-lxc
+++ b/examples/apparmor/libvirt-lxc
@@ -1,12 +1,18 @@
-# Last Modified: Fri Feb 7 13:01:36 2014
+# Last Modified: Thu, 18 Sep 2014 13:56:49 +0200
#include <abstractions/base>
umount,
+ dbus,
+ signal,
+ ptrace,
# ignore DENIED message on / remount
deny mount options=(ro, remount) -> /,
+ # support use of cgmanager proxy
+ mount options=(move) /sys/fs/cgroup/cgmanager/ -> /sys/fs/cgroup/cgmanager.lower/,
+
# allow tmpfs mounts everywhere
mount fstype=tmpfs,
@@ -33,8 +39,15 @@
mount fstype=fusectl -> /sys/fs/fuse/connections/,
mount fstype=securityfs -> /sys/kernel/security/,
mount fstype=debugfs -> /sys/kernel/debug/,
+ deny mount fstype=debugfs -> /var/lib/ureadahead/debugfs/,
mount fstype=proc -> /proc/,
mount fstype=sysfs -> /sys/,
+
+ mount options=(rw nosuid nodev noexec remount) -> /sys/,
+ mount options=(rw remount) -> /sys/kernel/security/,
+ mount options=(rw remount) -> /sys/fs/pstore/,
+ mount options=(ro remount) -> /sys/fs/pstore/,
+
deny /sys/firmware/efi/efivars/** rwklx,
deny /sys/kernel/security/** rwklx,
diff --git a/examples/apparmor/libvirt-qemu b/examples/apparmor/libvirt-qemu
index c6de6dd..b69e64c 100644
--- a/examples/apparmor/libvirt-qemu
+++ b/examples/apparmor/libvirt-qemu
@@ -1,4 +1,4 @@
-# Last Modified: Wed Sep 3 21:52:03 2014
+# Last Modified: Thu, 18 Sep 2014 16:41:21 +0200
#include <abstractions/base>
#include <abstractions/consoles>
@@ -13,15 +13,22 @@
capability setgid,
capability setuid,
+ # this is needed with libcap-ng support, however it breaks a lot of things
+ # atm, so just silence the denial until libcap-ng works right. LP: #522845
+ deny capability setpcap,
+
network inet stream,
network inet6 stream,
/dev/net/tun rw,
+ /dev/tap* rw,
/dev/kvm rw,
/dev/ptmx rw,
/dev/kqemu rw,
@{PROC}/*/status r,
@{PROC}/sys/kernel/cap_last_cap r,
+ owner @{PROC}/*/auxv r,
+ @{PROC}/sys/vm/overcommit_memory r,
# For hostdev access. The actual devices will be added dynamically
/sys/bus/usb/devices/ r,
@@ -38,6 +45,9 @@
/dev/snd/* rw,
capability ipc_lock,
# spice
+ /usr/bin/qemu-system-i386-spice rmix,
+ /usr/bin/qemu-system-x86_64-spice rmix,
+ /{dev,run}/shm/ r,
owner /{dev,run}/shm/spice.* rw,
# 'kill' is not required for sound and is a security risk. Do not enable
# unless you absolutely need it.
@@ -73,6 +83,7 @@
# the various binaries
/usr/bin/kvm rmix,
/usr/bin/qemu rmix,
+ /usr/bin/qemu-system-aarch64 rmix,
/usr/bin/qemu-system-arm rmix,
/usr/bin/qemu-system-cris rmix,
/usr/bin/qemu-system-i386 rmix,
@@ -91,6 +102,7 @@
/usr/bin/qemu-system-sparc rmix,
/usr/bin/qemu-system-sparc64 rmix,
/usr/bin/qemu-system-x86_64 rmix,
+ /usr/bin/qemu-system-x86_64-spice rmix,
/usr/bin/qemu-alpha rmix,
/usr/bin/qemu-arm rmix,
/usr/bin/qemu-armeb rmix,
@@ -117,6 +129,16 @@
/bin/dash rmix,
/bin/dd rmix,
/bin/cat rmix,
+ /etc/pki/CA/ r,
+ /etc/pki/CA/* r,
+ /etc/pki/libvirt/ r,
+ /etc/pki/libvirt/** r,
+
+ # for rbd
+ /etc/ceph/ceph.conf r,
+
+ # for access to hugepages
+ owner "/run/hugepages/kvm/libvirt/qemu/**" rw,
# for usb access
/dev/bus/usb/ r,
@@ -124,6 +146,13 @@
/sys/bus/ r,
/sys/class/ r,
+ signal (receive) peer=/usr/sbin/libvirtd,
+ ptrace (tracedby) peer=/usr/sbin/libvirtd,
+
+ # for ppc device-tree access
+ @{PROC}/device-tree/ r,
+ @{PROC}/device-tree/** r,
+
/usr/{lib,libexec}/qemu-bridge-helper Cx -> qemu_bridge_helper,
# child profile for bridge helper process
profile qemu_bridge_helper {
diff --git a/examples/apparmor/local-usr.sbin.libvirtd b/examples/apparmor/local-usr.sbin.libvirtd
new file mode 100644
index 0000000..6e19f20
--- /dev/null
+++ b/examples/apparmor/local-usr.sbin.libvirtd
@@ -0,0 +1,2 @@
+# Site-specific additions and overrides for usr.sbin.libvirtd.
+# For more details, please see /etc/apparmor.d/local/README.
diff --git a/examples/apparmor/usr.lib.libvirt.virt-aa-helper b/examples/apparmor/usr.lib.libvirt.virt-aa-helper
index bceaaff..4df86b0 100644
--- a/examples/apparmor/usr.lib.libvirt.virt-aa-helper
+++ b/examples/apparmor/usr.lib.libvirt.virt-aa-helper
@@ -1,8 +1,9 @@
-# Last Modified: Mon Apr 5 15:10:27 2010
+# Last Modified: Thu, 18 Sep 2014 14:05:36 +0200
#include <tunables/global>
/usr/lib/libvirt/virt-aa-helper {
#include <abstractions/base>
+ #include <abstractions/user-tmp>
# needed for searching directories
capability dac_override,
@@ -19,6 +20,12 @@
# for hostdev
/sys/devices/ r,
/sys/devices/** r,
+ /sys/bus/usb/devices/ r,
+ /sys/bus/usb/devices/** r,
+ deny /dev/sd* r,
+ deny /dev/dm-* r,
+ deny /dev/mapper/ r,
+ deny /dev/mapper/* r,
/usr/lib/libvirt/virt-aa-helper mr,
/sbin/apparmor_parser Ux,
@@ -26,8 +33,11 @@
/etc/apparmor.d/libvirt/* r,
/etc/apparmor.d/libvirt/libvirt-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]* rw,
- # for backingstore -- allow access to non-hidden files in @{HOME} as well
- # as storage pools
+ # For backingstore, virt-aa-helper needs to peek inside the disk image, so
+ # allow access to non-hidden files in @{HOME} as well as storage pools, and
+ # removable media and filesystems, and certain file extentions. A
+ # virt-aa-helper failure when checking a disk for backinsgstore is non-fatal
+ # (but obviously the backingstore won't be added).
audit deny @{HOME}/.* mrwkl,
audit deny @{HOME}/.*/ rw,
audit deny @{HOME}/.*/** mrwkl,
@@ -35,8 +45,17 @@
audit deny @{HOME}/bin/** mrwkl,
@{HOME}/ r,
@{HOME}/** r,
+ @{HOME}/.Private/** mrwlk,
+ @{HOMEDIRS}/.ecryptfs/*/.Private/** mrwlk,
+
/var/lib/libvirt/images/ r,
/var/lib/libvirt/images/** r,
+ /var/lib/nova/images/** r,
+ /var/lib/nova/instances/_base/** r,
+ /var/lib/nova/instances/snapshots/** r,
+ /var/lib/eucalyptus/instances/**/disk* r,
+ /var/lib/eucalyptus/instances/**/loader* r,
+ /var/lib/uvtool/libvirt/images/** r,
/{media,mnt,opt,srv}/** r,
/**.img r,
diff --git a/examples/apparmor/usr.sbin.libvirtd b/examples/apparmor/usr.sbin.libvirtd
index 3011eff..814b4d81 100644
--- a/examples/apparmor/usr.sbin.libvirtd
+++ b/examples/apparmor/usr.sbin.libvirtd
@@ -1,10 +1,12 @@
-# Last Modified: Mon Apr 5 15:03:58 2010
+# Last Modified: Tue, 23 Sep 2014 09:28:07 +0200
#include <tunables/global>
@{LIBVIRT}="libvirt"
/usr/sbin/libvirtd {
#include <abstractions/base>
#include <abstractions/dbus>
+ # Site-specific additions and overrides. See local/README for details.
+ #include <local/usr.sbin.libvirtd>
capability kill,
capability net_admin,
@@ -23,6 +25,7 @@
capability setpcap,
capability mknod,
capability fsetid,
+ capability ipc_lock,
capability audit_write,
# Needed for vfio
@@ -33,6 +36,12 @@
network inet6 stream,
network inet6 dgram,
network packet dgram,
+ network netlink,
+
+ dbus bus=system,
+ signal,
+ ptrace,
+ unix,
# Very lenient profile for libvirtd since we want to first focus on confining
# the guests. Guests will have a very restricted profile.
@@ -45,6 +54,12 @@
/usr/sbin/* PUx,
/lib/udev/scsi_id PUx,
/usr/lib/xen-common/bin/xen-toolstack PUx,
+ /usr/lib/xen-*/bin/pygrub PUx,
+ /usr/lib/xen-*/bin/libxl-save-helper PUx,
+
+ # Required by nwfilter_ebiptables_driver.c:ebiptablesWriteToTempFile() to
+ # write and run an ebtables script.
+ /var/lib/libvirt/virtd* ixr,
# force the use of virt-aa-helper
audit deny /sbin/apparmor_parser rwxl,
--
1.9.1
8 years, 11 months
[libvirt] [PATCH] qemu: don't refuse to undefine a guest with NVRAM file
by Daniel P. Berrange
The undefine operation should always be allowed to succeed
regardless of whether any NVRAM file exists. ie we should
not force the application to use the VIR_DOMAIN_UNDEFINE_NVRAM
flag. It is valid for the app to decide it wants the NVRAM
file left on disk, in the same way that disk images are left
on disk at undefine.
---
src/qemu/qemu_driver.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index bec05d4..302bf48 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6985,19 +6985,13 @@ qemuDomainUndefineFlags(virDomainPtr dom,
if (!virDomainObjIsActive(vm) &&
vm->def->os.loader && vm->def->os.loader->nvram &&
- virFileExists(vm->def->os.loader->nvram)) {
- if (!(flags & VIR_DOMAIN_UNDEFINE_NVRAM)) {
- virReportError(VIR_ERR_OPERATION_INVALID, "%s",
- _("cannot delete inactive domain with nvram"));
- goto cleanup;
- }
-
- if (unlink(vm->def->os.loader->nvram) < 0) {
- virReportSystemError(errno,
- _("failed to remove nvram: %s"),
- vm->def->os.loader->nvram);
- goto cleanup;
- }
+ virFileExists(vm->def->os.loader->nvram) &&
+ (flags & VIR_DOMAIN_UNDEFINE_NVRAM) &&
+ (unlink(vm->def->os.loader->nvram) < 0)) {
+ virReportSystemError(errno,
+ _("failed to remove nvram: %s"),
+ vm->def->os.loader->nvram);
+ goto cleanup;
}
if (virDomainDeleteConfig(cfg->configDir, cfg->autostartDir, vm) < 0)
--
2.1.0
8 years, 11 months
[libvirt] [PATCH v2 0/8] Add support for fetching statistics of completed jobs
by Jiri Denemark
Using virDomainGetJobStats, we can monitor running jobs but sometimes it
may be useful to get statistics about a job that already finished, for
example, to get the final amount of data transferred during migration or
to get an idea about total downtime. This is what the following patches
are about.
Version 2:
- changed according to John's review (see individual patches for
details)
Jiri Denemark (8):
Refactor job statistics
qemu: Avoid incrementing jobs_queued if virTimeMillisNow fails
Add support for fetching statistics of completed jobs
qemu: Silence coverity on optional migration stats
virsh: Add support for completed job stats
qemu: Transfer migration statistics to destination
qemu: Recompute downtime and total time when migration completes
qemu: Transfer recomputed stats back to source
include/libvirt/libvirt.h.in | 11 ++
src/libvirt.c | 11 +-
src/qemu/qemu_domain.c | 189 ++++++++++++++++++++++++++-
src/qemu/qemu_domain.h | 32 ++++-
src/qemu/qemu_driver.c | 130 ++++--------------
src/qemu/qemu_migration.c | 304 ++++++++++++++++++++++++++++++++++++-------
src/qemu/qemu_monitor_json.c | 10 +-
src/qemu/qemu_process.c | 9 +-
tools/virsh-domain.c | 27 +++-
tools/virsh.pod | 10 +-
10 files changed, 557 insertions(+), 176 deletions(-)
--
2.1.0
8 years, 11 months
[libvirt] [PATCH v2] add func to set shared drivers after libvirtd init
by Mikhail Feoktistov
Diff from v1:
Remove vz prefix from the title of this letter. Because this is the common case
for all drivers in libvirt.
Description:
Built-in drivers in libvirt are initialized before libvirtd initialization.
Libvirt loads shared drivers on libvirtd initialization step.
For built-in drivers we can't set shared drivers, because they are not initialized yet.
This patch adds function to set shared drivers after libvirtd init.
---
daemon/libvirtd.c | 4 ++++
src/libvirt.c | 41 +++++++++++++++++++++++++++++++++++++++++
src/libvirt_internal.h | 1 +
src/libvirt_private.syms | 1 +
4 files changed, 47 insertions(+)
diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c
index 250094b..aac1826 100644
--- a/daemon/libvirtd.c
+++ b/daemon/libvirtd.c
@@ -431,6 +431,10 @@ static void daemonInitialize(void)
bhyveRegister();
# endif
#endif
+# ifdef WITH_VZ
+ virAssignSharedDrivers("vz");
+ virAssignSharedDrivers("Parallels");
+# endif
}
diff --git a/src/libvirt.c b/src/libvirt.c
index 25a0040..1763be7 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -1433,3 +1433,44 @@ virTypedParameterValidateSet(virConnectPtr conn,
}
return 0;
}
+
+/**
+ * virAssignSharedDrivers:
+ * @name: name of connection driver
+ *
+ * This function fills in any empty pointers for shared drivers
+ * in connect driver structure
+ *
+ * Returns 0 in case of success, -1 in case of error
+*/
+int
+virAssignSharedDrivers(const char *name)
+{
+ size_t i;
+
+ if (name == NULL) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Driver name must be specified"));
+ return -1;
+ }
+
+ for (i = 0; i < virConnectDriverTabCount; i++) {
+ if (STREQ(virConnectDriverTab[i]->hypervisorDriver->name, name)) {
+ if (virConnectDriverTab[i]->interfaceDriver == NULL)
+ virConnectDriverTab[i]->interfaceDriver = virSharedInterfaceDriver;
+ if (virConnectDriverTab[i]->networkDriver == NULL)
+ virConnectDriverTab[i]->networkDriver = virSharedNetworkDriver;
+ if (virConnectDriverTab[i]->nodeDeviceDriver == NULL)
+ virConnectDriverTab[i]->nodeDeviceDriver = virSharedNodeDeviceDriver;
+ if (virConnectDriverTab[i]->nwfilterDriver == NULL)
+ virConnectDriverTab[i]->nwfilterDriver = virSharedNWFilterDriver;
+ if (virConnectDriverTab[i]->secretDriver == NULL)
+ virConnectDriverTab[i]->secretDriver = virSharedSecretDriver;
+ if (virConnectDriverTab[i]->storageDriver == NULL)
+ virConnectDriverTab[i]->storageDriver = virSharedStorageDriver;
+ break;
+ }
+ }
+
+ return 0;
+}
diff --git a/src/libvirt_internal.h b/src/libvirt_internal.h
index 1313b58..2a7227b 100644
--- a/src/libvirt_internal.h
+++ b/src/libvirt_internal.h
@@ -289,4 +289,5 @@ virTypedParameterValidateSet(virConnectPtr conn,
virTypedParameterPtr params,
int nparams);
+int virAssignSharedDrivers(const char *name);
#endif
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index a835f18..a0fcdf5 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -943,6 +943,7 @@ virFDStreamSetInternalCloseCb;
# libvirt_internal.h
+virAssignSharedDrivers;
virConnectSupportsFeature;
virDomainMigrateBegin3;
virDomainMigrateBegin3Params;
--
1.8.3.1
9 years
[libvirt] Block replication driver
by Simon Kollberg
Hi!
I'm working on supporting a new FT/HA solution for qemu called COLO
(http://wiki.qemu.org/Features/COLO). The part that is currently being
focused
on for libvirt integration is Block Replication
(http://wiki.qemu.org/Features/BlockReplication) which enables guest state
synchronization for disks.
Right now there are three issues that I'd like to get your input on:
1.
As you can see on the block replication wiki-page we need to reference the
secondary disk id.
Example from the wiki:
-drive if=none,driver=raw,file.filename=1.raw,id=colo1 \
-drive if=xxx,driver=replication,mode=secondary,\
...
file.backing.backing=colo1
My initial thought was to manually set the alias of the
disk and add a new reference element to the backingStore:
<disk type='file' device='disk'>
...
<alias name='colo1'/>
</disk>
<disk type='file' device='disk'>
...
<backingStore type='file'>
...
<reference name='colo1'/>
</backingStore>
</disk>
Though, I quickly realized that setting the alias is only done by the
hypervisor and is therefore not an option with the current code.
Would it be bad letting the user set the alias, and if so, do you have any
ideas of how to solve the referencing?
2.
The format of the disk and the driver type currently shares the same
attribute in libvirt (the type attribute on driver XML element). However,
with
the new replication disk driver you need to be able to set both the disk
format
and also the driver name.
Example from the wiki:
-drive if=xxx,driver=replication,mode=secondary,\
file.file.filename=active_disk.qcow2,\
file.driver=qcow2,\
...
I saw that there was a function in libvirt called virStorageFileProbeFormat
that could let us get the format of the disk without stating it in the XML.
But
as I'm sure you know, it's strongly advised not to be used since you can
trick
the function by modifying the disk file.
3.
When using the replication driver the secondary disk is supposed to be added
but not attached.
Example from the wiki:
-drive if=none,driver=raw,file.filename=1.raw,id=colo1 \
-drive if=xxx,driver=replication,mode=secondary,\
...
Clearly, trying to setup a disk without a target is not allowed at the
moment.
Is there any better way of doing it?
Any comments and insights in general are also greatly appreciated!
/Simon
9 years, 1 month
