[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] [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] maint: use $(SED) instead of sed for syntax-check
by Roman Bogorodskiy
Some syntax-check rules use GNU sed specific regexps, so allow
to override which sed would be used to fix 'syntax-check' for
non GNU-userland systems.
---
cfg.mk | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/cfg.mk b/cfg.mk
index 207dfeb..bd984bd 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -614,7 +614,7 @@ sc_libvirt_unmarked_diagnostics:
$(_sc_search_regexp)
@{ grep -nE '\<$(func_re) *\(.*;$$' $$($(VC_LIST_EXCEPT)); \
grep -A1 -nE '\<$(func_re) *\(.*,$$' $$($(VC_LIST_EXCEPT)); } \
- | sed 's/_("\([^\"]\|\\.\)\+"//;s/[ ]"%s"//' \
+ | $(SED) 's/_("\([^\"]\|\\.\)\+"//;s/[ ]"%s"//' \
| grep '[ ]"' && \
{ echo '$(ME): found unmarked diagnostic(s)' 1>&2; \
exit 1; } || :
@@ -639,7 +639,7 @@ sc_prohibit_newline_at_end_of_diagnostic:
sc_prohibit_diagnostic_without_format:
@{ grep -nE '\<$(func_re) *\(.*;$$' $$($(VC_LIST_EXCEPT)); \
grep -A2 -nE '\<$(func_re) *\(.*,$$' $$($(VC_LIST_EXCEPT)); } \
- | sed -rn -e ':l; /[,"]$$/ {N;b l;}' \
+ | $(SED) -rn -e ':l; /[,"]$$/ {N;b l;}' \
-e '/(xenapiSessionErrorHandler|vah_(error|warning))/d' \
-e '/\<$(func_re) *\([^"]*"([^%"]|"\n[^"]*")*"[,)]/p' \
| grep -vE 'VIR_ERROR' && \
@@ -661,7 +661,7 @@ sc_prohibit_useless_translation:
# or \n on one side of the split.
sc_require_whitespace_in_translation:
@grep -n -A1 '"$$' $$($(VC_LIST_EXCEPT)) \
- | sed -ne ':l; /"$$/ {N;b l;}; s/"\n[^"]*"/""/g; s/\\n/ /g' \
+ | $(SED) -ne ':l; /"$$/ {N;b l;}; s/"\n[^"]*"/""/g; s/\\n/ /g' \
-e '/_(.*[^\ ]""[^\ ]/p' | grep . && \
{ echo '$(ME): missing whitespace at line split' 1>&2; \
exit 1; } || :
@@ -681,11 +681,11 @@ sc_preprocessor_indentation:
sc_spec_indentation:
@if cppi --version >/dev/null 2>&1; then \
for f in $$($(VC_LIST_EXCEPT) | grep '\.spec\.in$$'); do \
- sed -e 's|#|// #|; s|%ifn*\(arch\)* |#if a // |' \
+ $(SED) -e 's|#|// #|; s|%ifn*\(arch\)* |#if a // |' \
-e 's/%\(else\|endif\|define\)/#\1/' \
-e 's/^\( *\)\1\1\1#/#\1/' \
-e 's|^\( *[^#/ ]\)|// \1|; s|^\( */[^/]\)|// \1|' $$f \
- | cppi -a -c 2>&1 | sed "s|standard input|$$f|"; \
+ | cppi -a -c 2>&1 | $(SED) "s|standard input|$$f|"; \
done | { if grep . >&2; then false; else :; fi; } \
|| { echo '$(ME): incorrect preprocessor indentation' 1>&2; \
exit 1; }; \
@@ -777,7 +777,7 @@ sc_prohibit_cross_inclusion:
# elements added to the enum by using a _LAST marker.
sc_require_enum_last_marker:
@grep -A1 -nE '^[^#]*VIR_ENUM_IMPL *\(' $$($(VC_LIST_EXCEPT)) \
- | sed -ne '/VIR_ENUM_IMPL[^,]*,$$/N' \
+ | $(SED) -ne '/VIR_ENUM_IMPL[^,]*,$$/N' \
-e '/VIR_ENUM_IMPL[^,]*,[^,]*[^_,][^L,][^A,][^S,][^T,],/p' \
-e '/VIR_ENUM_IMPL[^,]*,[^,]\{0,4\},/p' \
| grep . && \
@@ -878,7 +878,7 @@ ifeq (0,$(MAKELEVEL))
# b653eda3ac4864de205419d9f41eec267cb89eeb
#
# Keep this logic in sync with autogen.sh.
- _submodule_hash = sed 's/^[ +-]//;s/ .*//'
+ _submodule_hash = $(SED) 's/^[ +-]//;s/ .*//'
_update_required := $(shell \
cd '$(srcdir)'; \
test -d .git || { echo 0; exit; }; \
--
1.8.4.3
10 years, 9 months
[libvirt] [libvirt-python PATCH] setup: Make libvirt API XML path configurable
by Martin Kletzander
Adding a support for LIBVIRT_API_PATH evironment variable, which can
control where the script should look for the 'libvirt-api.xml' file.
This allows building libvirt-python against different libvirt than the
one installed in the system. This may be used for example in autotest
or by packagers without the need to install libvirt into the system.
Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
---
setup.py | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/setup.py b/setup.py
index 17b4722..566c210 100755
--- a/setup.py
+++ b/setup.py
@@ -109,7 +109,17 @@ class my_build(build):
"""Check with pkg-config that libvirt is present and extract
the API XML file paths we need from it"""
- libvirt_api = get_pkgconfig_data(["--variable", "libvirt_api"], "libvirt")
+ libvirt_api = os.getenv("LIBVIRT_API_PATH")
+
+ if libvirt_api:
+ if not libvirt_api.endswith("-api.xml"):
+ raise ValueError("Invalid path '%s' for API XML" % libvirt_api)
+ if not os.path.exists(libvirt_api):
+ raise ValueError("API XML '%s' does not exist, "
+ "have you built libvirt?" % libvirt_api)
+ else:
+ libvirt_api = get_pkgconfig_data(["--variable", "libvirt_api"],
+ "libvirt")
offset = libvirt_api.index("-api.xml")
libvirt_qemu_api = libvirt_api[0:offset] + "-qemu-api.xml"
--
1.8.4.3
10 years, 9 months
[libvirt] [PATCH 0/2] AppArmor updates
by Felix Geyer
I'm working on getting AppArmor support enabled in the Debian libvirt package.
As a result I've updated the profiles in example/ and added support for
filesystem mounts.
Felix Geyer (2):
apparmor: Allow access to filesystem mounts
apparmor: Improve profiles
examples/apparmor/libvirt-qemu | 21 +++++++++++++++----
examples/apparmor/usr.lib.libvirt.virt-aa-helper | 10 +++++++++
examples/apparmor/usr.sbin.libvirtd | 16 +++++++++++----
src/security/virt-aa-helper.c | 26 ++++++++++++++++++------
4 files changed, 59 insertions(+), 14 deletions(-)
--
1.8.5.3
10 years, 9 months
[libvirt] [PATCH] qemu: Fix seamless SPICE migration
by Martin Kletzander
Since the wait is done during migration (still inside
QEMU_ASYNC_JOB_MIGRATION_OUT), the code should enter the monitor as such
in order to prohibit all other jobs from interfering in the meantime.
This patch fixes bug #1009886 in which qemuDomainGetBlockInfo was
waiting on the monitor condition and after GetSpiceMigrationStatus
mangled its internal data, the daemon crashed.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1009886
Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com>
---
src/qemu/qemu_migration.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index d7b89fc..3a1aab7 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1595,7 +1595,10 @@ qemuMigrationWaitForSpice(virQEMUDriverPtr driver,
/* Poll every 50ms for progress & to allow cancellation */
struct timespec ts = { .tv_sec = 0, .tv_nsec = 50 * 1000 * 1000ull };
- qemuDomainObjEnterMonitor(driver, vm);
+ if (qemuDomainObjEnterMonitorAsync(driver, vm,
+ QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
+ return -1;
+
if (qemuMonitorGetSpiceMigrationStatus(priv->mon,
&spice_migrated) < 0) {
qemuDomainObjExitMonitor(driver, vm);
--
1.8.3.2
10 years, 9 months
[libvirt] [PATCH] qemu: add PCI-multibus support for ppc
by Olivia Yin
Signed-off-by: Olivia Yin <hong-hua.yin(a)freescale.com>
---
src/qemu/qemu_capabilities.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 7bc1ebc..7d7791d 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -2209,6 +2209,11 @@ virQEMUCapsInitHelp(virQEMUCapsPtr qemuCaps, uid_t runUid, gid_t runGid)
virQEMUCapsClear(qemuCaps, QEMU_CAPS_NO_ACPI);
}
+ /* ppc support PCI-multibus */
+ if (qemuCaps->arch == VIR_ARCH_PPC) {
+ virQEMUCapsSet(qemuCaps, QEMU_CAPS_PCI_MULTIBUS);
+ }
+
/* virQEMUCapsExtractDeviceStr will only set additional caps if qemu
* understands the 0.13.0+ notion of "-device driver,". */
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE) &&
@@ -2450,6 +2455,11 @@ virQEMUCapsInitQMP(virQEMUCapsPtr qemuCaps,
virQEMUCapsSet(qemuCaps, QEMU_CAPS_NO_ACPI);
}
+ /* ppc support PCI-multibus */
+ if (qemuCaps->arch == VIR_ARCH_PPC) {
+ virQEMUCapsSet(qemuCaps, QEMU_CAPS_PCI_MULTIBUS);
+ }
+
if (virQEMUCapsProbeQMPCommands(qemuCaps, mon) < 0)
goto cleanup;
if (virQEMUCapsProbeQMPEvents(qemuCaps, mon) < 0)
--
1.6.4
10 years, 9 months
