Currently LXC guests can be given arbitrary pre-mounted
filesystems, however, for some usecases it is more appropriate
to provide block devices which the container can mount itself.
This first impl only allows for <disk type='block'>, in other
words exposing a host disk device to a container. Since LXC
does not have device namespace virtualization, we are cheating
a little bit. If the XML specifies /dev/sdc4 to be given to
the container as /dev/sda1, when we do the mknod /dev/sda1
in the container's /dev, we actually use the major:minor
number of /dev/sdc4, not /dev/sda1.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Prepare to support different types of hostdevs by refactoring
the current SELinux security driver code
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
When LXC labels USB devices during hotplug, it is running in
host context, so it needs to pass in a vroot path to the
container root.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virSecurityManager{Set,Restore}AllLabel methods are invoked
at domain startup/shutdown to relabel resources associated with
a domain. This works fine with QEMU, but with LXC they are in
fact both currently no-ops since LXC does not support disks,
hostdevs, or kernel/initrd files. Worse, when LXC gains support
for disks/hostdevs, they will do the wrong thing, since they
run in host context, not container context. Thus this patch
turns then into a formal no-op when used with LXC. The LXC
controller will call out to specific security manager labelling
APIs as required during startup.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The code for creating veth/macvlan devices is part of the
LXC process startup code. Refactor this a little and export
the methods to the rest of the LXC driver. This allows them
to be reused for NIC hotplug code
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The <hostdev> device type has long had a redundant "mode"
attribute, which has always been "subsys". This finally
introduces a new mode "capabilities", which will be used
by the LXC driver for device assignment. Since container
based virtualization uses a single kernel, the idea of
assigning physical PCI devices doesn't make sense. It is
still reasonable to assign USB devices, but for assigning
arbitrary nodes in /dev, the new 'capabilities' mode is
to be used.
The first capability support is 'storage', which is for
assignment of block devices. Functionally this is really
pretty similar to the <disk> support. The only difference
is the device node name is identical in both host and
container namespaces.
<hostdev mode='capabilities' type='storage'>
<source>
<block>/dev/sdf1</block>
</source>
</hostdev>
The second capability support is 'misc', which is for
assignment of character devices. There is no existing
parallel to this. Again the device node is the same
inside & outside the container.
<hostdev mode='capabilities' type='misc'>
<source>
<char>/dev/input/event3</char>
</source>
</hostdev>
The reason for keeping the char & storage devices
separate in the domain XML, is to mirror the split
in the node device XML. NB the node device XML does
not yet report character devices, but that's another
new patch to come
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Test cases for virSysinfoRead. Initially, there are tests for
x86 (DMI based) and s390 (/proc/... based).
In lack of PPC data, I have stubbed out the test for it, but it
can be added with a minimal effort.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
There was a double free issue caused by virSysinfoRead on s390,
as the same manufacturer string instance was assigned to more
than one processor record.
Cleaned up other potential memory issues and restructured the sysinfo
parsing code by moving repeating patterns into a helper function.
The restructuring made it necessary to conditionally disable
-Wlogical-op for some older GCC versions, using pragma GCC diagnostic.
This is a GCC specific pragma, which is acceptable, since we're
using it to work around a GCC specific bug.
Finally, added a function virSysinfoSetup to configure the sysinfo
data source files/script during run time, to facilitate writing test
programs. This function is not published in sysinfo.h and only
there for testing.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
Some older versions of GCC report a false positive on code like
char * haystack, needle;
strchr(haystack, needle);
Added an extra check in configure.ac which will
#define BROKEN_GCC_WLOGICALOP 1
in this case, allowing to special handle "offending" code.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
This patch simplifies the code that parses the fallback and vendor_id
attributes from the domain xml cpu definition.
Changes done:
- free temp variables in the cleanup section instead of local use
- remove checking for presence of the attribute to directly getting the
value (saving call to virXPathBoolean)
- replace loop used to check for ',' in the vendor_id string with strchr
This patch fixes a problem that vendor_id attribute can not be defined
when fallback attribute is not defined.
If I define domain xml like below:
<domain>
<cpu>
<model vendor_id='aaaabbbbcccc'>core2duo</model>
</cpu>
</domain>
In dumpxml, vendor_id is not reflected:
<domain>
<cpu mode='custom' match='exact'>
<model fallback='allow'>core2duo</model>
</cpu>
</domain>
The expected output is:
<domain>
<cpu mode='custom' match='exact'>
<model fallback='allow' vendor_id='aaaabbbbcccc'>core2duo</model>
</cpu>
</domain>
If the fallback attribute and vendor_id attribute is defined at the same
time, it's reflected as expected.
Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com>
The current SELinux policy only works for KVM guests, since
TCG requires the 'execmem' privilege. There is a 'virt_use_execmem'
boolean to turn this on globally, but that is unpleasant for users.
This changes libvirt to automatically use a new 'svirt_tcg_t'
context for TCG based guests. This obsoletes the previous
boolean tunable and makes things 'just work(tm)'
Since we can't assume we run with new enough policy, I also
make us log a warning message (once only) if we find the policy
lacks support. In this case we fallback to the normal label and
expect users to set the boolean tunable
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
'-device VGA' maps to '-vga std'
'-device cirrus-vga' maps to '-vga cirrus'
'-device qxl-vga' maps to '-vga qxl'
(there is also '-device qxl' for secondary devices)
'-device vmware-svga' maps to '-vga vmware'
For qemu(>=1.2), we can use -device to replace -vga for video
device. For the primary video device, the patch tries to use 0x2
slot for matching old qemu. If the 0x2 slot is allocated already,
the addr property could help for using any available slot.
For qemu(< 1.2), we keep using -vga for primary device.
If there are multiple video devices
primary = 'yes' marks this video device as the primary one.
The rest are secondary video devices. No more than one could be
mark as primary. If none of them has primary attribute, the first
one will be the primary by default like what it was.
The reason of this changing is that for qemu, only one primary video
device is permitted which can be of any type. For secondary video
devices, only qxl is allowd. Primary attribute removes the restriction
that the first have to be the primary one.
We always put the primary video device into the first position of
video device structure array after parsing.
QEMU_CAPS_DEVICE_QXL -device qxl
QEMU_CAPS_DEVICE_VGA -device VGA
QEMU_CAPS_DEVICE_CIRRUS_VGA -device cirrus-vga
QEMU_CAPS_DEVICE_VMWARE_SVGA -device vmware-svga
QEMU_CAPS_DEVICE_VIDEO_PRIMARY /* safe to use -device XXX
for primary video device */
Fix a typo in qemuCapsObjectTypes, the string 'qxl' here
should be -device qxl rather than -vga [...|qxl|..]
Noticed these while building on FreeBSD.
* src/qemu/qemu_monitor.c (qemuMonitorBlockInfoLookup): Rename
variable to avoid 'devname' collision.
* src/qemu/qemu_driver.c (qemuDomainInterfaceStats): Mark unused
variable.
This adds an implementation of virNetSocketGetUNIXIdentity()
using LOCAL_PEERCRED socket option and xucred struct, defined
in <sys/ucred.h> on systems that have it.
A forgotten "!" in recently-modified code at the top of
networkRefreshDaemon() meant an improper early return, which led to 1)
dnsmasq config files not being updated from the newly modified config,
and 2) dnsmasq not being sent a SIGHUP so that it could learn about
the changes to the config.
virNetworkDefGetIpByIndex() returns NULL if there are no ip objects of
the requested type, and if there are no IP elements, then dnsmasq
shouldn't be running, so we can return early. Otherwise we should
rewrite the config files and send a SIGHUP.
Currently, if sanlock is already registering a lockspace other
libvirtd instances (from other hosts) obtain -EINPROGRESS. On
sufficiently new sanlock, sanlock_inq_lockspace() is called,
which suspend execution until lockspace state is changed. With
current libvirt implementation, we fail to retry adding the
lockspace again but continue in error path. Therefore we produce
meaningless error message:
virLockManagerSanlockSetupLockspace:363 : Unable to add lockspace
/var/lib/libvirt/sanlock/__LIBVIRT__DISKS__: Success
qemudLoadDriverConfig:558 : Failed to load lock manager sanlock
We should try to re-add the lockspace after its state change to
be sure it was added successfully. In fact, with sufficiently new
sanlock we can just avoid dummy usleep() which is used if there's
no inquire API.
The virtlockd daemon scripts were lousy, when compared to their
counterparts in daemon/Makefile.am. In particular, when init
scripts were selected, this resulted in 'make distcheck' failing
due to failure to clean up src/virtlockd.init.
* src/Makefile.am (install-systemd): Fix dependencies. Use MKDIR_P.
(uninstall-systemd): Remove empty directory. Use fewer processes.
(install-init, install-sysconfig): Use MKDIR_P.
(uninstall-init): Remove correct file, and also empty directory.
(uninstall-sysconfig): Remove empty directory.
(DISTCLEANFILES): Clean up trivially built sources.
When a network device's bridge connection is changed by
virDomainUpdateDevice, libvirt first removes the netdev's tap from its
old bridge, then adds it to the new bridge. Sometimes, due to a
network being destroyed while a guest device is still attached, the
tap may already be "removed" from the old bridge (or the old bridge
may not even exist any more); the existing code was needlessly failing
the update when this happened, making it impossible to recover from
the situation without completely detaching (i.e. removing) the netdev
from the guest and re-attaching.
Instead of failing the entire operation when removal of the tap from
the old bridge fails, this patch changes qemuDomainChangeNetBridge to
just log a warning and continue, allowing a reasonable recover from
the situation.
(you'll appreciate this change if you ever accidentally destroy a
network while your guests are still using it).
This patch resolves the problem reported in:
https://bugzilla.redhat.com/show_bug.cgi?id=886663
The source of the problem was the fix for CVE 2011-3411:
https://bugzilla.redhat.com/show_bug.cgi?id=833033
which was originally committed upstream in commit
753ff83a50. That commit improperly
removed the "--except-interface lo" from dnsmasq commandlines when
--bind-dynamic was used (based on comments in the latter bug).
It turns out that the problem reported in the CVE could be eliminated
without removing "--except-interface lo", and removing it actually
caused each instance of dnsmasq to listen on localhost on port 53,
which created a new problem:
If another instance of dnsmasq using "bind-interfaces" (instead of
"bind-dynamic") had already been started (or if another instance
started later used "bind-dynamic"), this wouldn't have any immediately
visible ill effects, but if you tried to start another dnsmasq
instance using "bind-interfaces" *after* starting any libvirt
networks, the new dnsmasq would fail to start, because there was
already another process listening on port 53.
(Subsequent to the CVE fix, another patch changed the network driver
to put dnsmasq options in a conf file rather than directly on the
dnsmasq commandline, but preserved the same options.)
This patch changes the network driver to *always* add
"except-interface=lo" to dnsmasq conf files, regardless of whether we use
bind-dynamic or bind-interfaces. This way no libvirt dnsmasq instances
are listening on localhost (and the CVE is still fixed).
The actual code change is miniscule, but must be propogated through all
of the test files as well.
For non-default connections (specified by the environment variable or
the command line option) we call virConnectOpenAuth without registering
the vshCatchDisconnect callback.
This calls vshReconnect instead which takes care of it.
Since we (ab)use vshReconnect for the default URI connection, if it
fails it might print 'Failed to reconnect to the hypervisor' even if we
were never connected before.
This changes it to only mention reconnection on the first try after
getting disconnected.
The default lockd driver behavour is to acquire leases
directly on the disk files. This introduces an alternative
mode, where leases are acquire indirectly on a file that
is based on a SHA256 hash of the disk filename.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This adds a 'lockd' lock driver which is just a client which
talks to the lockd daemon to perform all locking. This will
be the default lock driver for any hypervisor which needs one.
* src/Makefile.am: Add lockd.so plugin
* src/locking/lock_driver_lockd.c: Lockd driver impl
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virtlockd daemon maintains file locks on behalf of libvirtd
and any VMs it is running. These file locks must be held for as
long as any VM is running. If virtlockd itself ever quits, then
it is expected that a node would be fenced/rebooted. Thus to
allow for software upgrads on live systemd, virtlockd needs the
ability to re-exec() itself.
Upon receipt of SIGUSR1, virtlockd will save its current live
state out to a file /var/run/virtlockd-restart-exec.json
It then re-exec()'s itself with exactly the same argv as it
originally had, and loads the state file, reconstructing any
objects as appropriate.
The state file contains information about all locks held and
all network services and clients currently active. An example
state document is
{
"server": {
"min_workers": 1,
"max_workers": 20,
"priority_workers": 0,
"max_clients": 20,
"keepaliveInterval": 4294967295,
"keepaliveCount": 0,
"keepaliveRequired": false,
"services": [
{
"auth": 0,
"readonly": false,
"nrequests_client_max": 1,
"socks": [
{
"fd": 6,
"errfd": -1,
"pid": 0,
"isClient": false
}
]
}
],
"clients": [
{
"auth": 0,
"readonly": false,
"nrequests_max": 1,
"sock": {
"fd": 9,
"errfd": -1,
"pid": 0,
"isClient": true
},
"privateData": {
"restricted": true,
"ownerPid": 1722,
"ownerId": 6,
"ownerName": "f18x86_64",
"ownerUUID": "97586ba9-df27-9459-c806-f016c8bbd224"
}
},
{
"auth": 0,
"readonly": false,
"nrequests_max": 1,
"sock": {
"fd": 10,
"errfd": -1,
"pid": 0,
"isClient": true
},
"privateData": {
"restricted": true,
"ownerPid": 1784,
"ownerId": 7,
"ownerName": "f16x86_64",
"ownerUUID": "7b8e5e42-b875-61e9-b981-91ad8fa46979"
}
}
]
},
"defaultLockspace": {
"resources": [
{
"name": "/var/lib/libvirt/images/f16x86_64.raw",
"path": "/var/lib/libvirt/images/f16x86_64.raw",
"fd": 14,
"lockHeld": true,
"flags": 0,
"owners": [
1784
]
},
{
"name": "/var/lib/libvirt/images/shared.img",
"path": "/var/lib/libvirt/images/shared.img",
"fd": 12,
"lockHeld": true,
"flags": 1,
"owners": [
1722,
1784
]
},
{
"name": "/var/lib/libvirt/images/f18x86_64.img",
"path": "/var/lib/libvirt/images/f18x86_64.img",
"fd": 11,
"lockHeld": true,
"flags": 0,
"owners": [
1722
]
}
]
},
"lockspaces": [
],
"magic": "30199"
}
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This enhancement virtlockd so that it can receive a pre-opened
UNIX domain socket from systemd at launch time, and adds the
systemd service/socket unit files
* daemon/libvirtd.service.in: Require virtlockd to be running
* libvirt.spec.in: Add virtlockd systemd files
* src/Makefile.am: Install systemd files
* src/locking/lock_daemon.c: Support socket activation
* src/locking/virtlockd.service.in, src/locking/virtlockd.socket.in:
systemd unit files
* src/rpc/virnetserverservice.c, src/rpc/virnetserverservice.h:
Add virNetServerServiceNewFD() method
* src/rpc/virnetsocket.c, src/rpc/virnetsocket.h: Add virNetSocketNewListenFD
method
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Introduce a lock_daemon_dispatch.c file which implements the
server side dispatcher the RPC APIs previously defined in the
lock protocol.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virtlockd daemon will be responsible for managing locks
on virtual machines. Communication will be via the standard
RPC infrastructure. This provides the XDR protocol definition
* src/locking/lock_protocol.x: Wire protocol for virtlockd
* src/Makefile.am: Include lock_protocol.[ch] in virtlockd
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The virtlockd daemon will maintain locks on behalf of libvirtd.
There are two reasons for it to be separate
- Avoid risk of other libvirtd threads accidentally
releasing fcntl() locks by opening + closing a file
that is locked
- Ensure locks can be preserved across libvirtd restarts.
virtlockd will need to be able to re-exec itself while
maintaining locks. This is simpler to achieve if its
sole job is maintaining locks
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Refactor virLockManagerPluginNew() so that the caller does
not need to pass in the config file path itself - just the
config directory and driver name.
Fix QEMU to actually pass in a config file when creating the
default lock manager plugin, rather than NULL.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
