Re: [libvirt] [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
by Stefan Hajnoczi
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
> Hi everyone,
>
> I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with
> 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and
> the other is a malloc bdev that spdk created. This malloc bdev will exported to
> VM via vhost-user-blk. When I execute following command:
>
> virsh migrate --live --persistent --unsafe --undefinesource --copy-storage-all \
> --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
>
> The libvirt reports:
>
> qemu-2.12.1: error: internal error: unable to execute QEMU command \
> 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \
> node_name=drive-virtio-disk1
Please post your libvirt domain XML.
> Does it means that qemu with spdk on top of local storage don't support migration?
>
> QEMU: 2.12.1
> SPDK: 18.10
vhost-user-blk bypasses the QEMU block layer, so NBD storage migration
at the QEMU level will not work for the vhost-user-blk disk.
Stefan
1 year
[libvirt] [PATCH v3] openvswitch: Add new port VLAN mode "dot1q-tunnel"
by luzhipeng＠uniudc.com
From: ZhiPeng Lu <luzhipeng(a)uniudc.com>
Signed-off-by: ZhiPeng Lu <luzhipeng(a)uniudc.com>
---
v1->v2:
1. Fix "make syntax-check" failure
v2->v3:
1. remove other_config when updating vlan
docs/formatnetwork.html.in | 17 +++++++++--------
docs/schemas/networkcommon.rng | 1 +
src/conf/netdev_vlan_conf.c | 2 +-
src/util/virnetdevopenvswitch.c | 7 +++++++
src/util/virnetdevvlan.h | 1 +
5 files changed, 19 insertions(+), 9 deletions(-)
diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index 363a72b..3c1ae62 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -688,16 +688,17 @@
</p>
<p>
For network connections using Open vSwitch it is also possible
- to configure 'native-tagged' and 'native-untagged' VLAN modes
+ to configure 'native-tagged' and 'native-untagged' and 'dot1q-tunnel'
+ VLAN modes.
<span class="since">Since 1.1.0.</span> This is done with the
- optional <code>nativeMode</code> attribute on
- the <code><tag></code> subelement: <code>nativeMode</code>
- may be set to 'tagged' or 'untagged'. The <code>id</code>
- attribute of the <code><tag></code> subelement
- containing <code>nativeMode</code> sets which VLAN is considered
- to be the "native" VLAN for this interface, and
+ optional <code>nativeMode</code> attribute on the
+ <code><tag></code> subelement: <code>nativeMode</code>
+ may be set to 'tagged' or 'untagged' or 'dot1q-tunnel'.
+ The <code>id</code> attribute of the <code><tag></code>
+ subelement containing <code>nativeMode</code> sets which VLAN is
+ considered to be the "native" VLAN for this interface, and
the <code>nativeMode</code> attribute determines whether or not
- traffic for that VLAN will be tagged.
+ traffic for that VLAN will be tagged or QinQ.
</p>
<p>
<code><vlan></code> elements can also be specified in
diff --git a/docs/schemas/networkcommon.rng b/docs/schemas/networkcommon.rng
index 2699555..11c48ff 100644
--- a/docs/schemas/networkcommon.rng
+++ b/docs/schemas/networkcommon.rng
@@ -223,6 +223,7 @@
<choice>
<value>tagged</value>
<value>untagged</value>
+ <value>dot1q-tunnel</value>
</choice>
</attribute>
</optional>
diff --git a/src/conf/netdev_vlan_conf.c b/src/conf/netdev_vlan_conf.c
index dff49c6..79710d9 100644
--- a/src/conf/netdev_vlan_conf.c
+++ b/src/conf/netdev_vlan_conf.c
@@ -29,7 +29,7 @@
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_ENUM_IMPL(virNativeVlanMode, VIR_NATIVE_VLAN_MODE_LAST,
- "default", "tagged", "untagged")
+ "default", "tagged", "untagged", "dot1q-tunnel")
int
virNetDevVlanParse(xmlNodePtr node, xmlXPathContextPtr ctxt, virNetDevVlanPtr def)
diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c
index 8fe06fd..9fec30b 100644
--- a/src/util/virnetdevopenvswitch.c
+++ b/src/util/virnetdevopenvswitch.c
@@ -91,6 +91,11 @@ virNetDevOpenvswitchConstructVlans(virCommandPtr cmd, virNetDevVlanPtr virtVlan)
virCommandAddArg(cmd, "vlan_mode=native-untagged");
virCommandAddArgFormat(cmd, "tag=%d", virtVlan->nativeTag);
break;
+ case VIR_NATIVE_VLAN_MODE_DOT1Q_TUNNEL:
+ virCommandAddArg(cmd, "vlan_mode=dot1q-tunnel");
+ virCommandAddArg(cmd, "other_config:qinq-ethtype=802.1q");
+ virCommandAddArgFormat(cmd, "tag=%d", virtVlan->nativeTag);
+ break;
case VIR_NATIVE_VLAN_MODE_DEFAULT:
default:
break;
@@ -504,6 +509,8 @@ int virNetDevOpenvswitchUpdateVlan(const char *ifname,
"--", "--if-exists", "clear", "Port", ifname, "tag",
"--", "--if-exists", "clear", "Port", ifname, "trunk",
"--", "--if-exists", "clear", "Port", ifname, "vlan_mode",
+ "--", "--if-exists", "remove", "Port", ifname, "other_config",
+ "qinq-ethtype", NULL,
"--", "--if-exists", "set", "Port", ifname, NULL);
if (virNetDevOpenvswitchConstructVlans(cmd, virtVlan) < 0)
diff --git a/src/util/virnetdevvlan.h b/src/util/virnetdevvlan.h
index be85f59..0667f9d 100644
--- a/src/util/virnetdevvlan.h
+++ b/src/util/virnetdevvlan.h
@@ -29,6 +29,7 @@ typedef enum {
VIR_NATIVE_VLAN_MODE_DEFAULT = 0,
VIR_NATIVE_VLAN_MODE_TAGGED,
VIR_NATIVE_VLAN_MODE_UNTAGGED,
+ VIR_NATIVE_VLAN_MODE_DOT1Q_TUNNEL,
VIR_NATIVE_VLAN_MODE_LAST
} virNativeVlanMode;
--
1.8.3.1
1 year
[libvirt] [PATCH] Fix compile error for stable 1.2.9
by Yang hongyang
Seems a backport miss. An extra member is passed to struct
virLXCBasicMountInfo.
Signed-off-by: Yang hongyang <hongyang.yang(a)easystack.cn>
---
src/lxc/lxc_container.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 28dabec..1c65fa9 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -760,7 +760,7 @@ typedef struct {
static const virLXCBasicMountInfo lxcBasicMounts[] = {
{ "proc", "/proc", "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, false, false },
- { "/proc/sys", "/proc/sys", NULL, MS_BIND|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, false, false, false },
+ { "/proc/sys", "/proc/sys", NULL, MS_BIND|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, false, false },
{ "sysfs", "/sys", "sysfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, false, false },
{ "securityfs", "/sys/kernel/security", "securityfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, true, true },
#if WITH_SELINUX
--
1.7.1
1 year
[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-for-4.2] hw/mips: Deprecate the r4k machine
by Philippe Mathieu-Daudé
The r4k machine was introduced in 2005 (6af0bf9c7) and its last
logical change was in 2005 (9542611a6). After we can count 164
maintenance commits (QEMU API changes) with the exception of
1 fix in 2015 (memory leak, commit 3ad9fd5a).
This machine was introduced as a proof of concept to run a MIPS
CPU. 2 years later, the Malta machine was add (commit 5856de80)
modeling a real platform.
Note also this machine has no specification except 5 lines in
the header of this file:
* emulates a simple machine with ISA-like bus.
* ISA IO space mapped to the 0x14000000 (PHYS) and
* ISA memory at the 0x10000000 (PHYS, 16Mb in size).
* All peripherial devices are attached to this "bus" with
* the standard PC ISA addresses.
It is time to deprecate this obsolete machine. Users are
recommended to use the Malta board, which hardware is well
documented.
Signed-off-by: Philippe Mathieu-Daudé <philmd(a)redhat.com>
---
qemu-deprecated.texi | 5 +++++
hw/mips/mips_r4k.c | 1 +
MAINTAINERS | 2 +-
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 4b4b7425ac..05265b43c8 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -266,6 +266,11 @@ The 'scsi-disk' device is deprecated. Users should use 'scsi-hd' or
@section System emulator machines
+@subsection mips r4k platform (since 4.2)
+
+This machine type is very old and unmaintained. Users should use the 'malta'
+machine type instead.
+
@subsection pc-0.12, pc-0.13, pc-0.14 and pc-0.15 (since 4.0)
These machine types are very old and likely can not be used for live migration
diff --git a/hw/mips/mips_r4k.c b/hw/mips/mips_r4k.c
index 70024235ae..0b79ad26cb 100644
--- a/hw/mips/mips_r4k.c
+++ b/hw/mips/mips_r4k.c
@@ -294,6 +294,7 @@ void mips_r4k_init(MachineState *machine)
static void mips_machine_init(MachineClass *mc)
{
+ mc->deprecation_reason = "use malta machine type instead";
mc->desc = "mips r4k platform";
mc->init = mips_r4k_init;
mc->block_default_type = IF_IDE;
diff --git a/MAINTAINERS b/MAINTAINERS
index 5e5e3e52d6..3b3a88e264 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -972,7 +972,7 @@ F: hw/net/mipsnet.c
R4000
M: Aurelien Jarno <aurelien(a)aurel32.net>
R: Aleksandar Rikalo <aleksandar.rikalo(a)rt-rk.com>
-S: Maintained
+S: Obsolete
F: hw/mips/mips_r4k.c
Fulong 2E
--
2.21.0
4 years, 2 months
[libvirt] [python] WIP-FYI: mypy annotations for libvirt-python
by Philipp Hahn
Hello,
Maybe you already have heads about mypy <http://mypy-lang.org/>, which
"is an experimental optional static type checker for Python that aims to
combine the benefits of dynamic (or "duck") typing and static typing".
I started to write a manual annotation file for the Python binding of
libvirt. I've attached my current version, so others can benefit from
it, too. It is far from complete, but it already helped my to find some
errors in my code.
(My latest version is also available at
<https://github.com/univention/typeshed/blob/libvirt/third_party/2and3/lib...>)
Long-term it probably would be better to teach the Python binding
"generator.py" to add the type information (PEP 484
<https://www.python.org/dev/peps/pep-0484/>) directly into the generated
"libvirt.py" file, but that's for another day.
If someone else is interested in helping with that, please feel free to
get in contact.
Philipp
--
Philipp Hahn
Open Source Software Engineer
Univention GmbH
be open.
Mary-Somerville-Str. 1
D-28359 Bremen
Tel.: +49 421 22232-0
Fax : +49 421 22232-99
hahn(a)univention.de
http://www.univention.de/
Geschäftsführer: Peter H. Ganten
HRB 20755 Amtsgericht Bremen
Steuer-Nr.: 71-597-02876
4 years, 7 months
[libvirt] [PATCH v2 1/1] qemu: hide details of fake reboot
by Nikolay Shirokovskiy
If we use fake reboot then domain goes thru running->shutdown->running
state changes with shutdown state only for short period of time. At
least this is implementation details leaking into API. And also there is
one real case when this is not convinient. I'm doing a backup with the
help of temporary block snapshot (with the help of qemu's API which is
used in the newly created libvirt's backup API). If guest is shutdowned
I want to continue to backup so I don't kill the process and domain is
in shutdown state. Later when backup is finished I want to destroy qemu
process. So I check if it is in shutdowned state and destroy it if it
is. Now if instead of shutdown domain got fake reboot then I can destroy
process in the middle of fake reboot process.
After shutdown event we also get stop event and now as domain state is
running it will be transitioned to paused state and back to running
later. Though this is not critical for the described case I guess it is
better not to leak these details to user too. So let's leave domain in
running state on stop event if fake reboot is in process.
Reconnection code handles this patch without modification. It detects
that qemu is not running due to shutdown and then calls qemuProcessShutdownOrReboot
which reboots as fake reboot flag is set.
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com>
---
Changes from v1[1]:
- rebase on current master
- add comments
- use special flag to check if we should go paused or not*
- add notes about reconnection to commit message
* Using just fake reboot flag is not reliable. What if ACPI shutdown is
ignored by guest? Reboot flag will remain set and now domain state
will remain running on plain pause.
[1] https://www.redhat.com/archives/libvir-list/2019-October/msg01827.html
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_process.c | 61 ++++++++++++++++++++++++-----------------
2 files changed, 37 insertions(+), 25 deletions(-)
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index a32852047c..a39b9546ae 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -319,6 +319,7 @@ struct _qemuDomainObjPrivate {
char *lockState;
bool fakeReboot;
+ bool pausedShutdown;
virTristateBool allowReboot;
int jobs_queued;
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 7e1db50e8f..3e5fe3b6de 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -505,6 +505,7 @@ qemuProcessFakeReboot(void *opaque)
qemuDomainObjEndJob(driver, vm);
cleanup:
+ priv->pausedShutdown = false;
if (ret == -1)
ignore_value(qemuProcessKill(vm, VIR_QEMU_PROCESS_KILL_FORCE));
virDomainObjEndAPI(&vm);
@@ -528,6 +529,7 @@ qemuProcessShutdownOrReboot(virQEMUDriverPtr driver,
vm) < 0) {
VIR_ERROR(_("Failed to create reboot thread, killing domain"));
ignore_value(qemuProcessKill(vm, VIR_QEMU_PROCESS_KILL_NOWAIT));
+ priv->pausedShutdown = false;
virObjectUnref(vm);
}
} else {
@@ -589,35 +591,41 @@ qemuProcessHandleShutdown(qemuMonitorPtr mon G_GNUC_UNUSED,
goto unlock;
}
- VIR_DEBUG("Transitioned guest %s to shutdown state",
- vm->def->name);
- virDomainObjSetState(vm,
- VIR_DOMAIN_SHUTDOWN,
- VIR_DOMAIN_SHUTDOWN_UNKNOWN);
+ /* In case of fake reboot qemu shutdown state is transient so don't
+ * change domain state nor send events. */
+ if (!priv->fakeReboot) {
+ VIR_DEBUG("Transitioned guest %s to shutdown state",
+ vm->def->name);
+ virDomainObjSetState(vm,
+ VIR_DOMAIN_SHUTDOWN,
+ VIR_DOMAIN_SHUTDOWN_UNKNOWN);
- switch (guest_initiated) {
- case VIR_TRISTATE_BOOL_YES:
- detail = VIR_DOMAIN_EVENT_SHUTDOWN_GUEST;
- break;
+ switch (guest_initiated) {
+ case VIR_TRISTATE_BOOL_YES:
+ detail = VIR_DOMAIN_EVENT_SHUTDOWN_GUEST;
+ break;
- case VIR_TRISTATE_BOOL_NO:
- detail = VIR_DOMAIN_EVENT_SHUTDOWN_HOST;
- break;
+ case VIR_TRISTATE_BOOL_NO:
+ detail = VIR_DOMAIN_EVENT_SHUTDOWN_HOST;
+ break;
- case VIR_TRISTATE_BOOL_ABSENT:
- case VIR_TRISTATE_BOOL_LAST:
- default:
- detail = VIR_DOMAIN_EVENT_SHUTDOWN_FINISHED;
- break;
- }
+ case VIR_TRISTATE_BOOL_ABSENT:
+ case VIR_TRISTATE_BOOL_LAST:
+ default:
+ detail = VIR_DOMAIN_EVENT_SHUTDOWN_FINISHED;
+ break;
+ }
- event = virDomainEventLifecycleNewFromObj(vm,
- VIR_DOMAIN_EVENT_SHUTDOWN,
- detail);
+ event = virDomainEventLifecycleNewFromObj(vm,
+ VIR_DOMAIN_EVENT_SHUTDOWN,
+ detail);
- if (virDomainObjSave(vm, driver->xmlopt, cfg->stateDir) < 0) {
- VIR_WARN("Unable to save status on vm %s after state change",
- vm->def->name);
+ if (virDomainObjSave(vm, driver->xmlopt, cfg->stateDir) < 0) {
+ VIR_WARN("Unable to save status on vm %s after state change",
+ vm->def->name);
+ }
+ } else {
+ priv->pausedShutdown = true;
}
if (priv->agent)
@@ -651,7 +659,10 @@ qemuProcessHandleStop(qemuMonitorPtr mon G_GNUC_UNUSED,
reason = priv->pausedReason;
priv->pausedReason = VIR_DOMAIN_PAUSED_UNKNOWN;
- if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING) {
+ /* In case of fake reboot qemu paused state is transient so don't
+ * reveal it in domain state nor sent events */
+ if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING &&
+ !priv->pausedShutdown) {
if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT) {
if (priv->job.current->status == QEMU_DOMAIN_JOB_STATUS_POSTCOPY)
reason = VIR_DOMAIN_PAUSED_POSTCOPY;
--
2.23.0
4 years, 7 months
RFC: qemu: use uuid instead of name for misc filenames
by Nikolay Shirokovskiy
Hi, everyone.
I'm working on supporting domain renaming when it has snapshots which is not
supported now. And it strikes me things will be much simplier to manage on
renaming if we use uuid in filenames instead of domain names.
1. Renaming will only involve saving updated config.
The saving is atomic thanx to tmp file and rename(2) approach. In constast
current renaming on error paths can leave config with old or new name. Thus
on libvirt restart extra VM will appear.
And we don't need to rename autostart links, snapshot directories etc.
2. Renaming will be possible for running domains with no efforts.
We only need to pass uuid instead of name in '-name guest=...' command line.
3. Mgmt can stop using autogenerated names for domains.
I guess openstack for example uses names like instance-000002ff because we
have many limitations on domain renaming. And if these limitations are removed
then openstack can just use user supplied names for domains.
4. No issues with long domain names and filename length limit
If the above conversion makes sense I guess the good time to apply it is
on domain start (and rename to support renaming with snapshots).
I guess we can also have tool (some virsh command) for developers to generate
symlinks so one can access logs, configs etc by name instead of uuid.
Nikolay
4 years, 7 months
