In an attempt to simplify qemuDomainSaveImageOpen we need to add
automatic pointer clearing for virQEMUSaveData.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Commit 21ad56e932 introduced a regression where a VM with a corrupted
save image file would fail to start on the first attempt. This was
caused by returning a wrong return code as 'fd' was abused to also hold
the return code.
Since it's easy to miss this nuance, introduce a 'ret' variable for the
return code and return it' value in the error section.
https://bugzilla.redhat.com/show_bug.cgi?id=1791522
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Pavel Mores <pmores@redhat.com>
virCommand is now used everywhere.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Suggested-by: Sebastian Mitterle <smitterl@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Catch the individual usage not removed in previous commits.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Construct the command in multiple steps instead of using a sentinel
in the args array.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
If an user is trying to configure a dhcp neetwork settings, it is not
possible to change the leasetime of a range or a host entry. This is
available using dnsmasq extra options, but they are associated with
dhcp-range or dhcp-hosts fields. This patch implements a leasetime for
range and hosts tags. They can be defined under that settings:
<dhcp>
<range ...>
<lease/>
</range>
<host ...>
<lease/>
</host>
</dhcp>
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=913446
Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
When a device is "move"-d (this basically means it was renamed),
we add the new device onto our list but keep the old there too.
Fortunately, udev sets this DEVPATH_OLD property which points to
the old device path. We can use it to remove the old instance.
To test this try renaming an interface, for instance:
# ip link set tunl0 name tunl1
# ip link set tunl1 name tunl0
One problem with udev is that it sends old ifname in INTERFACE
property, which creates a problem for us, the property is where
we get the ifname from and use it then to query all kind of info
about the interface. Well, if it is non-existent then we can't
query anything. This happens if ifname rename is suppressed
(net.ifnames=0 on kernel cmd line for instance). Fortunately, we
can use "kernel" source for udev events which has always the
fresh info.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Move internals of udevRemoveOneDevice() into a separate function
which accepts sysfs path as an argument and actually removes the
device from the internal list. It will be reused later.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
When removing a node device object from the internal list the
udevRemoveOneDevice() function does plain unref over the object.
This is not sufficient. If there is another thread that's waiting
for the object lock it will wait forever.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The virDomainDefParseXML function has grown so large it broke the build:
../../src/conf/domain_conf.c:20362:1: error: stack frame size of 4168 bytes
in function 'virDomainDefParseXML' [-Werror,-Wframe-larger-than=]
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
The file doesn't use virSystemd functions directly.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
External devices are started before cgroup is created. Add the DBus
daemon to the VM cgroup with the rest of the external devices.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Allow calling qemuDBusStart() multiple times (as may be done by
qemu-slirp already).
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
The slirp helper process should be associated with the VM cgroup, like
other helpers.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Don't stop the DBus daemon if a slirp helper failed to start, as it
may be shared with other helpers.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Add support for xl.cfg(5) 'passthrough' option in the domXML-to-xenconfig
configuration converter.
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
'passthrough' is Xen-Specific guest configuration option new to Xen 4.13
that enables IOMMU mappings for a guest and hence whether it supports PCI
passthrough. The default is disabled. See the xl.cfg(5) man page and
xen.git commit babde47a3fe for more details.
The default state of disabled prevents hotlugging PCI devices. However,
if the guest configuration contains a PCI passthrough device at time of
creation, libxl will automatically enable 'passthrough' and subsequent
hotplugging of PCI devices will also be possible. It is not possible to
unconditionally enable 'passthrough' since it would introduce a migration
incompatibility due to guest ABI change. Instead, introduce another Xen
hypervisor feature that can be used to enable guest PCI passthrough
<features>
<xen>
<passthrough state='on'/>
</xen>
</features>
To allow finer control over how IOMMU maps to guest P2M table, the
passthrough element also supports a 'mode' attribute with values
restricted to snyc_pt and share_pt, similar to xl.cfg(5) 'passthrough'
setting .
Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
e820_host is a Xen-specific option, only available for PV domains, that
provides the domain a virtual e820 memory map based on the host one. It
is enabled with a new Xen hypervisor feature, e.g.
<features>
<xen>
<e820_host state='on'/>
</xen>
</features>
e820_host is required when using PCI passthrough and is generally
considered safe for any PV kernel. e820_host is silently ignored if set
in HVM domain configuration. See xl.cfg(5) man page in the Xen
documentation for more details.
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Jim Fehlig <jfehlig@suse.com>
The udev monitor thread "udevEventHandleThread()" will lag the
actual/real view of devices in sysfs as it serially processes udev
monitor events. So for instance if you were to run the following cmd
to create a new veth pair and rename one of the veth endpoints
you might see the following monitor events and real world that looks like
time
| create v0 sysfs entry
wake udevEventHandleThread | create v1 sysfs entry
udev_monitor_receive_device(v1-add) | move v0 sysfs to v2
udevHandleOneDevice(v1) |
udev_monitor_receive_device(v0-add) |
udevHandleOneDevice(v0) | <--- error msgs in virNetDevGetLinkInfo()
udev_monitor_receive_device(v2-move) | as v0 no longer exists
udevHandleOneDevice(v2) |
\/
As you can see the changes in sysfs can take place well before we get
to act on the events in the udevEventHandleThread(), so by the time we
get around to processing the v0 add event, the sysfs entry has been
moved to v2.
To work around this we check if the sysfs entry is valid before
attempting to read it and don't bother trying to read link info if
not. This is safe since we will never read sysfs entries earlier than
it existing, ie. if the entry is not there it has either been removed
in the time since we enumerated the device or something bigger is
busted, in either case, no sysfs entry, no link info. In the case
described above we will eventually get the link info as we work
through the queue of monitor events and get to the 'move' event.
https://bugzilla.redhat.com/show_bug.cgi?id=1557902
Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
It is possible and common to rename some devices, this is especially
true for ethernet devices such as veth pairs.
In the udevEventHandleThread() we will be notified of this change but
currently we only process "add", "change" and "remove"
events. Renaming a device such as above results in a "move" event, not
a "remove" followed by and "add" or vise versa. This change will add
the new/destination device to our records but unfortunately there is
no usable mechanism to identify the old/source device to remove it
from the records. So this is admittedly only a partial fix.
Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Changes in the API:
- APIs related to the graphics adapter are no longer on the
IMachine interface, but on a IGraphicsAdapter interface
- The LaunchVMProcess method takes a list of env variables
instead of a single variable containing a concatenated
list. Since we only ever pass a single env variable, we
can simply stuff it straight into a list.
- The DHCP server start method no longer needs the network
name
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Changes in the API:
- The CreatedSharedFolder method now accepts a target mount
point. Since we don't request automount, we're just passing
NULL. We could, however, use this to pass the desired
mount target from the XML config in future.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Long ago we switched the vbox driver to run inside libvirtd to avoid
libvirt.so being polluted with GPLv2-only code. Since libvirtd is not
built on Windows, we disabled vbox on Windows builds. Thus the MSCOM
glue code is not required.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
While I'm at it, use more g_autofree and g_autoptr() in this
file. This also fixes a possible mem-leak in
virNetDevGetVirtualFunctions().
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
I've just got a new machine and I'm still converging on the
kernel config. Anyway, since I don't have enabled any of SRIO-V
drivers, my kernel doesn't have NET_DEVLINK enabled (i.e.
virNetDevGetFamilyId() returns 0). But this makes nodedev driver
ignore all interfaces, because when enumerating all devices via
udev, the control reaches virNetDevSwitchdevFeature() eventually
and subsequently virNetDevGetFamilyId() which 'fails'. Well, it's
not really a failure - the virNetDevSwitchdevFeature() stub
simply returns 0.
Also, move the call a few lines below, just around the place
where it's needed.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Introduced in v3.8.0-rc1~96, the virNetDevGetFamilyId() gets
netlink family ID for passed family name (even though it's used
only for getting "devlink" ID). Nevertheless, the function
returns 0 on an error or if no family ID was found. This makes it
harder for a caller to distinguish these two. Change the retval
so that a negative value is returned upon error, zero is no ID
found (but no error encountered) and a positive value is returned
on successful translation.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
As explained in the previous commit, we need to relabel the file
we are restoring the domain from. That is the FD that is passed
to QEMU. If the file is not under /dev then the file inside the
namespace is the very same as the one in the host. And regardless
of using transactions, the file will be relabeled. But, if the
file is under /dev then when using transactions only the copy
inside the namespace is relabeled and the one in the host is not.
But QEMU is reading from the one in the host, actually.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1772838
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This API allows drivers to separate out handling of @stdin_path
of virSecurityManagerSetAllLabel(). The thing is, the QEMU driver
uses transactions for virSecurityManagerSetAllLabel() which
relabels devices from inside of domain's namespace. This is what
we usually want. Except when resuming domain from a file. The
file is opened before any namespace is set up and the FD is
passed to QEMU to read the migration stream from. Because of
this, the file lives outside of the namespace and if it so
happens that the file is a block device (i.e. it lives under
/dev) its copy will be created in the namespace. But the FD that
is passed to QEMU points to the original living in the host and
not in the namespace. So relabeling the file inside the namespace
helps nothing.
But if we have a separate API for relabeling the restore file
then the QEMU driver can continue calling
virSecurityManagerSetAllLabel() with transactions enabled and
call this new API without transactions.
We already have an API for relabeling a single file
(virSecurityManagerDomainSetPathLabel()) but in case of SELinux
it uses @imagelabel (which allows RW access) and we want to use
@content_context (which allows RO access).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This commit partially reverts
commit c360ea28dc
Refs: v6.2.0-rc1-1-gc360ea28dc
Author: Rafael Fonseca <r4f4rfs@gmail.com>
AuthorDate: Fri Mar 27 18:40:47 2020 +0100
Commit: Michal Prívozník <mprivozn@redhat.com>
CommitDate: Mon Mar 30 09:48:22 2020 +0200
util: virdaemon: fix compilation on mingw
The daemons are not supported on Win32 and therefore were not compiled
in that platform. However, with the daemon code sharing, all the code in
utils *is* compiled and it failed because `waitpid`, `fork`, and
`setsid` are not available. So, as before, let's not build them on
Win32 and make the code more portable by using existing vir* wrappers.
Not compiling virDaemonForkIntoBackground on Win32 is good, but the
second part of the original patch incorrectly replaced waitpid and fork
with our virProcessWait and virFork APIs. These APIs are more than just
simple wrappers and we don't want any of the extra functionality.
Especially virFork would reset any setup made before
virDaemonForkIntoBackground is called, such as logging, signal handling,
etc.
As a result of the change the additional fix in v6.2.0-67-ga87e4788d2
(util: virdaemon: fix waiting for child processes) is no longer
needed and it is effectively reverted by this commit.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Fixes build error introduced in
commit aa15e9259f
Author: Laine Stump <laine@redhat.com>
Date: Sun Apr 5 22:40:37 2020 -0400
qemu/conf: set HOTPLUGGABLE connect flag during PCI address set init
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Trivial comment fix, reflecting the changes in
4ee2b31804.
Signed-off-by: Leonid Bloch <lb.workbox@gmail.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Previously, we used virCapabilitiesDomainDataLookup() to fill
machine type in post parse callback if none was provided in the
domain XML. If machine type couldn't be filled in an error was
reported. After 4a4132b462 we've changed it to
virQEMUCapsGetPreferredMachine() which returns NULL, but we no
longer report an error and proceed with the post parse callbacks
processing. This may lead to a crash because the code later on
assumes def->os.machine is not NULL.
Fixes: 4a4132b462
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Mores <pmores@redhat.com>
When preparing to do a blockcopy, the mirror image is modified so
that QEMU can access it. For instance, the mirror has seclabels
set, if it is a NVMe disk it is detached from the host and so on.
And usually, the restore is done upon successful finish of the
blockcopy operation. But, if something fails then we need to
explicitly revoke the access to the mirror image (and thus
reattach NVMe disk back to the host).
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1822538
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Mores <pmores@redhat.com>
When we do parallel migration, The multifd-channels migration parameter
needs to be set on the destination side as well before incoming migration
URI, unless we accept the default number of connections(2).
Usually, This can be correctly handled by libvirtd. But in this case if
we use p2p + xbzrle compression without parameter '--comp-xbzrle-cache',
qemuMigrationParamsDump returns too early, The corresponding migration
parameter will not be set on the destination side, It results QEMU hangs.
Reproducer:
virsh migrate --live --p2p --comp-methods xbzrle \
--parallel --parallel-connections 3 GUEST qemu+ssh://dsthost/system
or
virsh migrate --live --p2p --compressed \
--parallel --parallel-connections 3 GUEST qemu+ssh://dsthost/system
Signed-off-by: Lin Ma <lma@suse.com>
Message-Id: <20200416044451.21134-1-lma@suse.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
With libpmem support compiled into qemu it will trigger the following
denials on every startup.
apparmor="DENIED" operation="open" name="/"
apparmor="DENIED" operation="open" name="/sys/bus/nd/devices/"
This is due to [1] that tries to auto-detect if the platform supports
auto flush for all region.
Once we know all the paths that are potentially needed if this feature
is really used we can add them conditionally in virt-aa-helper and labelling
calls in case </pmem> is enabled.
But until then the change here silences the denial warnings seen above.
[1]: https://github.com/pmem/pmdk/blob/master/src/libpmem2/auto_flush_linux.c#L131
Bug: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1871354
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Acked-by: Jamie Strandboge <jamie@canonical.com>
Starting with 3b076391be
(v6.1.0-122-g3b076391be) we support http cookies. Since they may contain
somewhat sensitive information we should not format them into the XML
unless VIR_DOMAIN_DEF_FORMAT_SECURE is asserted.
Reported-by: Han Han <hhan@redhat.com>
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
