[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
[libvirt] [PATCH 0/4] Multiple problems with saving to block devices
by Daniel P. Berrange
This patch series makes it possible to save to a block device,
instead of a plain file. There were multiple problems
- WHen save failed, we might de-reference a NULL pointer
- When save failed, we unlinked the device node !!
- The approach of using >> to append, doesn't work with block devices
- CGroups was blocking QEMU access to the block device when enabled
One remaining problem is not in libvirt, but rather QEMU. The QEMU
exec: based migration often fails to detect failure of the command
and will thus hang forever attempting a migration that'll never
succeed! Fortunately you can now work around this in libvirt using
the virsh domjobabort command
11 years, 7 months
[libvirt] [PATCHv4 00/51] another round of snapshot patches
by Eric Blake
I think I've addressed most findings from round 3 - by implementing
the ability to redefine a snapshot, it becomes possible to restore
snapshot hierarchy when recreating a transient domain by the same
name. New goodies in this round: several bug fixes, add virsh
snapshot-edit, drop undefine --snapshots-full (you can only remove
snapshot metadata on undefine). I tested as I went, but this went
through so many rebases that there may be some nasties that snuck
in; but I wanted to get this posted now. I also know that I'm
missing at least one major feature requested in the v3 review:
namely, transient domains _should_ auto-remove snapshot metadata
files when they halt, but right now aren't doing that.
v3 was at:
https://www.redhat.com/archives/libvir-list/2011-August/msg01132.html
Also available here:
git fetch git://repo.or.cz/libvirt/ericb.git snapshot
or browse online at:
http://repo.or.cz/w/libvirt/ericb.git/shortlog/refs/heads/snapshot
I'm also trying to group things by several bugzilla related to
various patches (looks like I still need to create a few):
Eric Blake (51):
https://bugzilla.redhat.com/show_bug.cgi?id=674537
snapshot: fix corner case on OOM during creation
https://bugzilla.redhat.com/show_bug.cgi?id=733762
snapshot: better events when starting paused
snapshot: fine-tune ability to start paused
snapshot: expose --running and --paused in virsh
snapshot: fine-tune qemu saved images starting paused
snapshot: improve reverting to qemu paused snapshots
snapshot: properly revert qemu to offline snapshots
snapshot: fine-tune qemu snapshot revert states
no bug filed yet... should be one about no stale metadata
snapshot: allow deletion of just snapshot metadata
snapshot: add snapshot-list --parent to virsh
https://bugzilla.redhat.com/show_bug.cgi?id=733529
snapshot: speed up snapshot location
snapshot: avoid crash when deleting qemu snapshots
snapshot: track current domain across deletion of children
snapshot: simplify acting on just children
no bug filed yet... should be one about no stale metadata
snapshot: let qemu discard only snapshot metadata
snapshot: identify which snapshots have metadata
snapshot: reflect new dumpxml and list options in virsh
snapshot: identify qemu snapshot roots
snapshot: allow recreation of metadata
snapshot: refactor virsh snapshot creation
snapshot: improve virsh snapshot-create, add snapshot-edit
snapshot: add qemu snapshot creation without metadata
no bug filed yet... should be one about snapshot migration
snapshot: add qemu snapshot redefine support
snapshot: prevent stranding snapshot data on domain destruction
snapshot: teach virsh about new undefine flags
snapshot: refactor some qemu code
snapshot: cache qemu-img location
snapshot: support new undefine flags in qemu
snapshot: prevent migration from stranding snapshot data
https://bugzilla.redhat.com/show_bug.cgi?id=638510
snapshot: refactor domain xml output
snapshot: allow full domain xml in snapshot
snapshot: correctly escape generated xml
snapshot: update rng to support full domain in xml
snapshot: store qemu domain details in xml
snapshot: additions to domain xml for disks
snapshot: reject transient disks where code is not ready
snapshot: introduce new deletion flag
snapshot: expose new delete flag in virsh
snapshot: allow halting after snapshot
snapshot: expose halt-after-creation in virsh
snapshot: wire up new qemu monitor command
snapshot: support extra state in snapshots
snapshot: add <disks> to snapshot xml
snapshot: also support disks by path
snapshot: add virsh domblklist command
snapshot: add flag for requesting disk snapshot
snapshot: wire up disk-only flag to snapshot-create
snapshot: reject unimplemented disk snapshot features
snapshot: make it possible to audit external snapshot
snapshot: wire up live qemu disk snapshots
snapshot: use SELinux and lock manager with external snapshots
docs/formatdomain.html.in | 40 +-
docs/formatsnapshot.html.in | 269 ++-
docs/schemas/Makefile.am | 1 +
docs/schemas/domain.rng | 2555 +-------------------
docs/schemas/{domain.rng => domaincommon.rng} | 32 +-
docs/schemas/domainsnapshot.rng | 84 +-
examples/domain-events/events-c/event-test.c | 37 +-
include/libvirt/libvirt.h.in | 66 +-
src/conf/domain_audit.c | 12 +-
src/conf/domain_audit.h | 4 +-
src/conf/domain_conf.c | 902 ++++++--
src/conf/domain_conf.h | 76 +-
src/esx/esx_driver.c | 38 +-
src/libvirt.c | 256 ++-
src/libvirt_private.syms | 8 +
src/libxl/libxl_conf.c | 5 +
src/libxl/libxl_driver.c | 11 +-
src/qemu/qemu_command.c | 5 +
src/qemu/qemu_conf.h | 1 +
src/qemu/qemu_driver.c | 1532 +++++++++---
src/qemu/qemu_hotplug.c | 18 +-
src/qemu/qemu_migration.c | 48 +-
src/qemu/qemu_migration.h | 2 -
src/qemu/qemu_monitor.c | 24 +
src/qemu/qemu_monitor.h | 4 +
src/qemu/qemu_monitor_json.c | 33 +
src/qemu/qemu_monitor_json.h | 4 +
src/qemu/qemu_monitor_text.c | 40 +
src/qemu/qemu_monitor_text.h | 4 +
src/qemu/qemu_process.c | 11 +-
src/uml/uml_driver.c | 56 +-
src/vbox/vbox_tmpl.c | 43 +-
src/xen/xend_internal.c | 12 +-
src/xenxs/xen_sxpr.c | 5 +
src/xenxs/xen_xm.c | 5 +
tests/domainsnapshotxml2xmlin/disk_snapshot.xml | 16 +
tests/domainsnapshotxml2xmlout/disk_snapshot.xml | 77 +
tests/domainsnapshotxml2xmlout/full_domain.xml | 35 +
.../qemuxml2argv-disk-snapshot.args | 7 +
.../qemuxml2argv-disk-snapshot.xml | 39 +
.../qemuxml2argv-disk-transient.xml | 27 +
tests/qemuxml2argvtest.c | 2 +
tests/virsh-optparse | 20 +
tools/virsh.c | 772 +++++-
tools/virsh.pod | 214 ++-
45 files changed, 3978 insertions(+), 3474 deletions(-)
copy docs/schemas/{domain.rng => domaincommon.rng} (98%)
create mode 100644 tests/domainsnapshotxml2xmlin/disk_snapshot.xml
create mode 100644 tests/domainsnapshotxml2xmlout/disk_snapshot.xml
create mode 100644 tests/domainsnapshotxml2xmlout/full_domain.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-snapshot.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-snapshot.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-transient.xml
--
1.7.4.4
11 years, 12 months
[libvirt] help for libvirt0.9.8 compile
by hero
my redhat6.1 has a libvirt0.8.7, and I got a libvirt0.9.8.tar that I want to update the old one.
when I use
'./configure --prefix=/usr --libdir=/usr/lib64 --localstatedir=/var --sysconfdir=/etc'
it siad 'configure: error: You must install device-mapper-devel/libdevmapper >= 1.0.0 to compile libvirt'
please tell me how to do if you know.
thanks.
best wishes!
SunYongGang
12 years, 6 months
[libvirt] Modern CPU models cannot be used with libvirt
by Jiri Denemark
Hi,
Recently I realized that all modern CPU models defined in
/etc/qemu/target-x86_64.conf are useless when qemu is used through libvirt.
That's because we start qemu with -nodefconfig which results in qemu ignoring
that file with CPU model definitions. We have a very good reason for using
-nodefconfig because we need to control the ABI presented to a guest OS and we
don't want any configuration file that can contain lots of things including
device definitions to be read by qemu. However, we would really like the new
CPU models to be understood by qemu even if used through libvirt. What would
be the best way to solve this?
I suspect this could have been already discussed in the past but obviously a
workable solution was either not found or just not implemented.
Jirka
12 years, 7 months
[libvirt] [PATCH] qemu: Copy console definition from serial
by Michal Privoznik
Now, when we support multiple consoles per domain,
the vm->def->console[0] can still remain an alias
for vm->def->serial[0]; However, we need to copy
it's source definition as well otherwise we'll regress
on virDomainOpenConsole.
---
src/conf/domain_conf.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++
src/conf/domain_conf.h | 2 +
src/libvirt_private.syms | 1 +
src/qemu/qemu_process.c | 19 +++++++++--
4 files changed, 90 insertions(+), 4 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 6b78d97..9b2eb86 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -956,6 +956,78 @@ virDomainChrSourceDefClear(virDomainChrSourceDefPtr def)
}
}
+int
+virDomainChrSourceDefCopy(virDomainChrSourceDefPtr dest,
+ virDomainChrSourceDefPtr src)
+{
+ if (!dest || !src)
+ return -1;
+
+ switch (src->type) {
+ case VIR_DOMAIN_CHR_TYPE_PTY:
+ case VIR_DOMAIN_CHR_TYPE_DEV:
+ case VIR_DOMAIN_CHR_TYPE_FILE:
+ case VIR_DOMAIN_CHR_TYPE_PIPE:
+ if (src->data.file.path &&
+ !(dest->data.file.path = strdup(src->data.file.path))) {
+ virReportOOMError();
+ return -1;
+ }
+ break;
+
+ case VIR_DOMAIN_CHR_TYPE_UDP:
+ if (src->data.udp.bindHost &&
+ !(dest->data.udp.bindHost = strdup(src->data.udp.bindHost))) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (src->data.udp.bindService &&
+ !(dest->data.udp.bindService = strdup(src->data.udp.bindService))) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (src->data.udp.connectHost &&
+ !(dest->data.udp.connectHost = strdup(src->data.udp.connectHost))) {
+ virReportOOMError();
+ return -1;
+ }
+
+
+ if (src->data.udp.connectService &&
+ !(dest->data.udp.connectService = strdup(src->data.udp.connectService))) {
+ virReportOOMError();
+ return -1;
+ }
+ break;
+
+ case VIR_DOMAIN_CHR_TYPE_TCP:
+ if (src->data.tcp.host &&
+ !(dest->data.tcp.host = strdup(src->data.tcp.host))) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (src->data.tcp.service &&
+ !(dest->data.tcp.service = strdup(src->data.tcp.service))) {
+ virReportOOMError();
+ return -1;
+ }
+ break;
+
+ case VIR_DOMAIN_CHR_TYPE_UNIX:
+ if (src->data.nix.path &&
+ !(dest->data.nix.path = strdup(src->data.nix.path))) {
+ virReportOOMError();
+ return -1;
+ }
+ break;
+ }
+
+ return 0;
+}
+
void virDomainChrSourceDefFree(virDomainChrSourceDefPtr def)
{
if (!def)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index c360674..76a8dd7 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1662,6 +1662,8 @@ void virDomainNetDefFree(virDomainNetDefPtr def);
void virDomainSmartcardDefFree(virDomainSmartcardDefPtr def);
void virDomainChrDefFree(virDomainChrDefPtr def);
void virDomainChrSourceDefFree(virDomainChrSourceDefPtr def);
+int virDomainChrSourceDefCopy(virDomainChrSourceDefPtr src,
+ virDomainChrSourceDefPtr dest);
void virDomainSoundDefFree(virDomainSoundDefPtr def);
void virDomainMemballoonDefFree(virDomainMemballoonDefPtr def);
void virDomainWatchdogDefFree(virDomainWatchdogDefPtr def);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index b9d537e..e6ccf9d 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -242,6 +242,7 @@ virDomainChrConsoleTargetTypeToString;
virDomainChrDefForeach;
virDomainChrDefFree;
virDomainChrDefNew;
+virDomainChrSourceDefCopy;
virDomainChrSourceDefFree;
virDomainChrSpicevmcTypeFromString;
virDomainChrSpicevmcTypeToString;
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 2882ef8..e0b1824 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -1163,11 +1163,22 @@ qemuProcessFindCharDevicePTYs(virDomainObjPtr vm,
for (i = 0 ; i < vm->def->nconsoles ; i++) {
virDomainChrDefPtr chr = vm->def->consoles[i];
- if (chr->source.type == VIR_DOMAIN_CHR_TYPE_PTY &&
- chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_VIRTIO) {
- if ((ret = qemuProcessExtractTTYPath(output, &offset,
- &chr->source.data.file.path)) != 0)
+ /* For historical reasons, console[0] can be just an alias
+ * for serial[0]; That's why we need to update it as well */
+ if (i == 0 && vm->def->nserials &&
+ chr->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_CONSOLE &&
+ chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_SERIAL) {
+ if ((ret = virDomainChrSourceDefCopy(&chr->source,
+ &((vm->def->serials[0])->source))) != 0)
return ret;
+ chr->source.type = VIR_DOMAIN_CHR_TYPE_PTY;
+ } else {
+ if (chr->source.type == VIR_DOMAIN_CHR_TYPE_PTY &&
+ chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_VIRTIO) {
+ if ((ret = qemuProcessExtractTTYPath(output, &offset,
+ &chr->source.data.file.path)) != 0)
+ return ret;
+ }
}
}
--
1.7.3.4
12 years, 7 months
[libvirt] virsh bash completion file
by Serge E. Hallyn
Hi,
I've been trying out a bash autocompletion file by Geoff Low (slight hack
by me, don't blame him for my hack), and it's working pretty nicely.
I'm not sure where to put it in the git tree, but it seems like it'd be
nice to have upstream?
thanks,
-serge
====================================================
#!/bin/bash
#############################################################################
#
# virsh bash completion
# Author: Geoff Low (glow(a)cmedresearch.com)
#
############################################################################
VIRSH=$(which virsh)
function get_main_option_list
{
# assume options are specified as [--option1 | --option2 | ...]
OPTIONS=$(${VIRSH} help | grep '|' | sed -e 's/.*\[\(.*\)\]/\1/g;s/|//g')
}
function get_option_list
{
# get the options for a choice
local option=$1;
# assume options are specified as [--option1 | --option2 | ...]
OPTIONS=$(${VIRSH} help ${option} 2> /dev/null | grep '|' | sed -e 's/.*\[\(.*\)\]/\1/g;s/|//g')
}
function _virsh_complete()
{
local cur prev opts
COMPREPLY=()
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[COMP_CWORD-1]}"
cnxn=""
i=0
while [[ $i -lt $COMP_CWORD ]]; do
if [ ${COMP_WORDS[i]} = "-c" ]; then
tgt=`echo ${COMP_LINE} | sed -e 's/^.* -c \([^ \t]*\).*$/\1/'`
cnxn="-c $tgt"
break
fi
let i++
done
if [ ! -z $tgt ]; then
if [ $COMP_CWORD -eq 5 ]; then
prev="${COMP_WORDS[0]}"
fi
fi
_all_domains=$(${VIRSH} ${cnxn} --q list --all 2> /dev/null | grep -E "(running|shut off)$" | awk '{print $2,$3}')
all_domains=$(echo "$_all_domains" | cut -d " " -f 1)
all_networks=$(${VIRSH} --q net-list --all 2> /dev/null | grep 'active' | cut -d " " -f 1)
live_domains=$(echo "$_all_domains" | grep -E "running$" | awk '{print $1}')
shutoff_domains=$(echo "$_all_domains" | grep -E "shut$" | awk '{print $1}')
case "${prev}" in
virsh | --help)
get_main_option_list
ALL_OPTS=$(${VIRSH} -q help 2> /dev/null | sed '1,2d' | awk '{print $1}')
COMPREPLY=( $(compgen -W "$OPTIONS $ALL_OPTS" -- ${cur}) )
;;
list)
get_option_list ${prev}
COMPREPLY=( $(compgen -W "$OPTIONS" -- ${cur}) )
;;
autostart | dominfo | domuuid | domid | dominfo | domname | dumpxml | setmem )
get_option_list ${prev}
COMPREPLY=( $(compgen -W "$OPTIONS $all_domains" -- ${cur}) )
;;
start | undefine)
get_option_list ${prev}
COMPREPLY=( $(compgen -W "$OPTIONS $shutoff_domains" -- ${cur}) )
;;
create | define)
get_option_list ${prev}
xml_files=$(ls *.xml)
COMPREPLY=( $(compgen -W "$OPTIONS $xml_files" -- ${cur}) )
;;
shutdown | domstate | console | destroy | reboot | save | suspend | resume | vcpuinfo | vncdisplay)
get_option_list ${prev}
COMPREPLY=( $(compgen -W "$OPTIONS $live_domains" -- ${cur}) )
;;
connect)
get_option_list ${prev}
URI_TEMPLATES="xen:// qemu:// test:// xen+ssh:// test+tcp:// qemu+unix:// qemu+tls:// qemu+ssh://"
COMPREPLY=( $(compgen -W "$OPTIONS $URI_TEMPLATES" -- ${cur}) )
;;
*)
COMPREPLY=( $(compgen -f -- ${cur}) )
return 0
;;
esac
}
complete -F _virsh_complete virsh
12 years, 8 months
