The LXC driver relies on use of cgroups to kill off LXC processes
in shutdown. If cgroups aren't available, we're unable to kill
off processes, so we must treat lack of cgroups as a fatal startup
error.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The code setting up LXC cgroups used an 'rc' variable both
for capturing the return value of methods it calls, and
its own return status. The result was that several failures
in setting up cgroups would actually result in success being
returned.
Use a separate 'ret' for tracking return value as per normal
code design in other parts of libvirt
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The initpid will be required long term to enable LXC to
implement various hotplug operations. Thus it needs to be
persisted in the domain status XML. LXC has not used the
domain status XML before, so this introduces use of the
helpers.
Currently the lxcContainerSetupMounts method uses the
virSecurityManagerPtr instance to obtain the mount options
string and then only passes the string down into methods
it calls. As functionality in LXC grows though, those
methods need to have direct access to the virSecurityManagerPtr
instance. So push the code down a level.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The impls of virSecurityManagerGetMountOptions had no way to
return errors, since the code was treating 'NULL' as a success
value. This is somewhat pointless, since the calling code did
not want NULL in the first place and has to translate it into
the empty string "". So change the code so that the impls can
return "" directly, allowing use of NULL for error reporting
once again
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=876828
Commit 38c4a9cc introduced a regression in hot unplugging of disks
from qemu, where cgroup device ACLs were no longer being revoked
(thankfully not a security hole: cgroup ACLs only prevent open()
of the disk; so reverting the ACL prevents future abuse but doesn't
stop abuse from an fd that was already opened before the ACL change).
The actual regression is due to a latent bug. The hot unplug code
was computing the set of files needing cgroup ACL revocation based
on the XML passed in by the user, rather than based on the domain's
details on which disk was being deleted. As long as the revoke
path was always recomputing the backing chain, this didn't really
matter; but now that we want to compute the chain exactly once and
remember that computation, we need to hang on to the backing chain
until after the revoke has happened.
* src/qemu/qemu_hotplug.c (qemuDomainDetachPciDiskDevice):
Transfer backing chain before deletion.
This patch introduces the RNG schema and updates necessary data strucutures
to allow various hypervisors to make use of Gluster protocol as one of the
supported network disk backend. Next patch will add support to make use of
this feature in Qemu since it now supports Gluster protocol as one of the
network based storage backend.
Two new optional attributes for <host> element are introduced - 'transport'
and 'socket'. Valid transport values are tcp, unix or rdma. If none specified,
tcp is assumed. If transport is unix, socket specifies path to unix socket.
This patch allows users to specify disks on gluster backends like this:
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
<source protocol='gluster' name='Volume1/image'>
<host name='example.org' port='6000' transport='tcp'/>
</source>
<target dev='vda' bus='virtio'/>
</disk>
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
<source protocol='gluster' name='Volume2/image'>
<host transport='unix' socket='/path/to/sock'/>
</source>
<target dev='vdb' bus='virtio'/>
</disk>
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
Although we require various C99 features, we don't yet require a
complete C99 compiler. On RHEL 5, compilation complained:
qemu/qemu_command.c: In function 'qemuBuildGraphicsCommandLine':
qemu/qemu_command.c:4688: error: 'for' loop initial declaration used outside C99 mode
* src/qemu/qemu_command.c (qemuBuildGraphicsCommandLine): Declare
variable sooner.
* src/qemu/qemu_process.c (qemuProcessInitPasswords): Likewise.
The patch refactors the current ESX storage driver due to following reasons:
1. Given most of the public APIs exposed by the storage driver in Libvirt
remains same, ESX storage driver should not implement logic specific
for only one supported format (current implementation only supports VMFS).
2. Decoupling interface from specific storage implementation gives us an
extensible design to hook implementation for other supported storage
formats.
This patch refactors the current driver to implement it as a facade pattern i.e.
the driver exposes all the public libvirt APIs, but uses backend drivers to get
the required task done. The backend drivers provide implementation specific to
the type of storage device.
File changes:
------------------
esx_storage_driver.c ----> esx_storage_driver.c (base storage driver)
|
|---> esx_storage_backend_vmfs.c (VMFS backend)
When no security driver is specified libvirt_lxc segfaults as a debug
message tries to access security labels for the container that are not
present.
This problem was introduced in commit 6c3cf57d6c.
Early jumps to the cleanup label caused a crash of the libvirt_lxc
container helper as the cleanup section called
virLXCControllerDeleteInterfaces(ctrl) without checking the ctrl argument
for NULL. The argument was de-referenced soon after.
$ /usr/libexec/libvirt_lxc
/usr/libexec/libvirt_lxc: missing --name argument for configuration
Segmentation fault
This will simplify the refactoring of the ESX storage driver to support
a VMFS and an iSCSI backend.
One of the tasks the storage driver needs to do is to decide which backend
driver needs to be invoked for a given request. This approach extends
virStoragePool and virStorageVol to store extra parameters:
1. privateData: stores pointer to respective backend storage driver.
2. privateDataFreeFunc: stores cleanup function pointer.
virGetStoragePool and virGetStorageVol are modfied to accept these extra
parameters as user params. virStoragePoolDispose and virStorageVolDispose
checks for cleanup operation if available.
The private data pointer allows the ESX storage driver to store a pointer
to the used backend with each storage pool and volume. This avoids the need
to detect the correct backend in each storage driver function call.
The new model supports following features in addition to those supported
by SandyBridge:
fma, pcid, movbe, fsgsbase, bmi1, hle, avx2, smep, bmi2, erms, invpcid,
rtm
Commit 258e06c removed setting of the volume type to
VIR_STORAGE_VOL_BLOCK, which leads to failures in
storageVolumeCreateXMLFrom.
The type (and target.format) of the volume was set to zero. In
virStorageBackendGetBuildVolFromFunction, this gets interpreted as
VIR_STORAGE_FILE_NONE and the qemu-img tool is called with unknown
"none" format.
Bug: https://bugzilla.redhat.com/show_bug.cgi?id=879780
bridge_driver.h: silence gcc warnings:
statement with no effect [-Wunused-value]
unused variable 'net' [-Wunused-variable]
virdrivermoduletest.c: don't require network driver module
if it hasn't been built.
The virLXCControllerClientCloseHook method was mistakenly
assuming that the private data associated with the network
client was the virLXCControllerPtr. In fact it was just a
dummy int, so we were derefencing a bogus struct. The
frequent result of this was that we would never quit, because
we tried to arm a non-existant timer.
Fix the code by removing the dummy private data and just
using the virLXCControllerPtr instance as private data
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
It is possible for there to be deleted timers when we
calculate the next timeout, and they must be skipped.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The event code is a no-op if requested to update a non-existent
timer/handle watch. This makes it hard to detect bugs in the
caller who have passed bogus data. Add a VIR_WARN output in
such cases, since the API does not allow for return errors.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The docs for virDiskNameToIndex claim it ignores partition
numbers. In actual fact though, a code ordering bug means
that a partition number will cause the code to accidentally
multiply the result by 26.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
I was convicted that space at EOL should no be there
even for qemu help data. Hence, I've removed one in
commit bb2f621611. However, it turns out we want
it exactly the way qemu produces it. So I should undo
my premature fix. A patch against qemu has been posted
as well.
Commit e0c469e58b that fixes the detection
of image chain wasn't complete. Iteration through the backing image
chain has to stop at the last existing image if some of the images are
missing otherwise the backing chain that is cached contains entries with
paths being set to NULL resulting to:
error: Unable to allow access for disk path (null): Bad address
Fortunately stat() is kind enough not to crash when it's presented with
a NULL argument. At least on Linux.
The error "... but the cause is unknown" appeared for XMLs similar to
this:
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/dev/zero'/>
<target dev='sr0'/>
</disk>
Notice unsupported disk type (for the driver), but also no address
specified. The first part is not a problem and we should not abort
immediately because of that, but the combination with the address
unknown was causing an unspecified error.
While fixing this, I added an error to one place where this return
value was not managed properly.
Fixes this error when building with -Werror on Alpine Linux:
util/processinfo.c: In function 'virProcessInfoSetAffinity':
util/processinfo.c:52:5: error: implicit declaration of function 'malloc' [-Werror=implicit-function-declaration]
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Currently the LXC driver logs audit messages when a container
is started or stopped. These audit messages, however, contain
the PID of the libvirt_lxc supervisor process. To enable
sysadmins to correlate with audit messages generated by
processes /inside/ the container, we need to include the
container init process PID.
We can't do this in the main 'start' audit message, since
the init PID is not available at that point. Instead we output
a completely new audit record, that lists both PIDs.
type=VIRT_CONTROL msg=audit(1353433750.071:363): pid=20180 uid=0 auid=501 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='virt=lxc op=init vm="busy" uuid=dda7b947-0846-1759-2873-0f375df7d7eb vm-pid=20371 init-pid=20372 exe="/home/berrange/src/virt/libvirt/daemon/.libs/lt-libvirtd" hostname=? addr=? terminal=pts/6 res=success'
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The LXC controller code currently directly invokes the
libvirt main loop code. The problem is that this misses
the cleanup of virNetServerClient connections that
virNetServerRun takes care of.
The result is that when libvirtd is stopped, the
libvirt_lxc controller process gets stuck in a I/O loop.
When libvirtd is then started again, it fails to connect
to the controller and thus kills off the entire domain.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Regression introduced by commit 258e06c85b, "ret" could be set to 1
or 0 by virStorageBackendFileSystemIsMounted before goto cleanup.
This could mislead the callers (up to the public API
virStoragePoolDestroy) to return success even the underlying umount
command fails.
I have been testing libvirt v1.0.0 for deployment within my
organization, and in the process discovered what appears to be a bug
that breaks virsh attach-device, when attaching an RBD volume to an
instance. First, here is the error presented, with v1.0.0 (this worked
in v0.10.2):
[root@host ~]# virsh attach-device W5APQ8 G84VV1.xml
error: Failed to attach device from G84VV1.xml
error: cannot open file 'dc3-1-test/G84VV1': No such file or directory
Using git bisect, I narrowed the problem down to this as the first
commit to break this setup:
4d34c92947 is the first bad commit
Both generated with
qemu-system-x86_64 --help > qemu-1.2.0
qemu-system-x86_64 \
-device ? \
-device pci-assign,? \
-device virtio-blk-pci,? \
-device virtio-net-pci,? \
-device scsi-disk,? \
-device PIIX4_PM,? \
-device usb-redir,? \
-device ide-drive,? \
-device usb-host,? 2> qemu-1.2.0-device
It seems I missed a few -device flags when doing this last time and I
mixed up qemu and qemu-kvm.
Commit a4c19459aa only added the
QEMU capability flag, command line option and added the boot element
for redirdev's in the XML schema.
This patch adds support for parsing and writing the XML with redirdevs
with the boot flag. It also ignores unknown XML elements in redirdev
instead of failing with:
"error: An error occurred, but the cause is unknown"
Bug: https://bugzilla.redhat.com/show_bug.cgi?id=805414
If .gnulib is deleted unexpectedly, autogen.sh will fail with message:
fatal: ambiguous argument '.gnulib': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
which is actually given by git diff .gnulib, which doesn't exist.
In the case to run bootstrap to create .gnulib.
Upcoming patches for revert-and-clone branching of snapshots need
to be able to copy a domain definition; make this step reusable.
* src/conf/domain_conf.h (virDomainDefCopy): New prototype.
* src/conf/domain_conf.c (virDomainObjCopyPersistentDef): Split...
(virDomainDefCopy): ...into new function.
(virDomainObjSetDefTransient): Use it.
* src/libvirt_private.syms (domain_conf.h): Export it.
* src/qemu/qemu_driver.c (qemuDomainRevertToSnapshot): Use it.
Now that we can filter on this information, we should also make
it easy to get at.
* tools/virsh-snapshot.c (cmdSnapshotInfo): Add another output
row, and switch to XPath queries rather than strstr.
Relatively straight-forward. And since qemu was already using
VIR_DOMAIN_SNAPSHOT_FILTERS_ALL, with 6 different APIs all calling
into this common code, I've instantly added all 5 flags to 6 APIs.
* src/conf/snapshot_conf.h (VIR_DOMAIN_SNAPSHOT_FILTERS_ALL):
Enable new filters.
* src/conf/snapshot_conf.c (virDomainSnapshotObjListGetNames):
Prep the new flags.
(virDomainSnapshotObjListCopyNames): Actually do the filtering.
Snapshot filtering based on types is useful enough to add
back-compat support into virsh. It is also rather easy - all
versions of libvirt that don't understand the new filter flags
already gave us sufficient information in a single XML field
to reconstruct all the information we need (that is, it isn't
until libvirt 1.0.1 that we have more interesting types of
snapshots, such as offline external).
* tools/virsh-snapshot.c (vshSnapshotFilter): New function.
(vshSnapshotListCollect): Add fallback support.
As we enable more modes of snapshot creation, it becomes more important
to be able to quickly filter based on snapshot properties. This patch
introduces new filter flags; subsequent patches will introduce virsh
back-compat filtering, as well as actual libvirt filtering.
* include/libvirt/libvirt.h.in (virDomainSnapshotListFlags): Add
five new flags in two new groups.
* src/libvirt.c (virDomainSnapshotNum, virDomainSnapshotListNames)
(virDomainListAllSnapshots, virDomainSnapshotNumChildren)
(virDomainSnapshotListChildrenNames)
(virDomainSnapshotListAllChildren): Document them.
* src/conf/snapshot_conf.h (VIR_DOMAIN_SNAPSHOT_FILTERS_STATUS)
(VIR_DOMAIN_SNAPSHOT_FILTERS_LOCATION): Add new convenience filter
collection macros.
* tools/virsh-snapshot.c (cmdSnapshotList): Add 5 new flags.
* tools/virsh.pod (snapshot-list): Document them.
This resolves:
https://bugzilla.redhat.com/show_bug.cgi?id=873134
The reported problem is that an attempt to restore a saved domain that
was configured with <currentMemory> and <memory> set to some (same for
both) number that's not a multiple of 4096KiB results in an error like
this:
error: Failed to start domain libvirt_test_api
error: XML error: current memory '4001792k' exceeds maximum '4000768k'
(in this case, currentMemory was set to 4000000KiB).
The reason for this failure is:
1) a saved image contains the "live xml" of the domain at the time of
the save.
2) the live xml of a running domain gets its currentMemory
(a.k.a. cur_balloon) directly from the qemu monitor rather than from
the configuration of the domain.
3) the value reported by qemu is (sometimes) not exactly what was
originally given to qemu when the domain was started, but is rounded
up to [some indeterminate granularity] - in some versions of qemu that
granularity is apparently 1MiB, and in others it is 4MiB.
4) When the XML is parsed to setup the state of the restored domain,
the XML parser for <currentMemory> compares it to <memory> (which is
the maximum allowed memory size for the domain) and if <currentMemory>
is greater than the next 1024KiB boundary above <memory>, it spits out
an error and fails.
For example (from the BZ) if you start qemu on RHEL6 with both
<currentMemory> and <memory> of 4000000 (this number is in KiB),
libvirt's dominfo or dumpxml will report "4001792" back (rounded up to
next 4MiB) for 10-20 seconds after the start, then revert to reporting
"4000000". On Fedora 16 (which uses qemu-1.0), it will instead report
"4000768" (rounded up to next 1MiB). On Fedora 17 (qemu-1.2), it seems
to always report "4000000". ("4000000" is of course okay, and
"4000768" is also okay since that's the next 1024KiB boundary above
"4000000" and the parser was already allowing for that. But "4001792
is *not* okay and produces the error message.)
This patch solves the problem by changing the allowed "fudge factor"
when parsing from 1024KiB to 4096KiB to match the maximum up-rounding
that could be done in qemu.
(I had earlier thought to fix this by up-rounding <memory> in the
dumpxml that's put into the saved image, but that wouldn't have fixed
the case where the save image was produced by an "unfixed"
libvirtd.)
