Once qemu monitor reports migration has completed, we just closed our
end of the pipe and let migration tunnel die. This generated bogus error
in case we did so before the thread saw EOF on the pipe and migration
was aborted even though it was in fact successful.
With this patch we first wake up the tunnel thread and once it has read
all data from the pipe and finished the stream we close the
filedescriptor.
A small additional bonus of this patch is that real errors reported
inside qemuMigrationIOFunc are not overwritten by virStreamAbort any
more.
When QEMU reported failed or canceled migration, we correctly detected
it but didn't really consider it as an error condition and migration
protocol just went on. Luckily, some of the subsequent steps eventually
failed end we reported an (unrelated and mostly random) error back to
the caller.
Currently, non-blocking calls are either sent immediately or discarded
in case sending would block. This was implemented based on the
assumption that the non-blocking keepalive call is not needed as there
are other calls in the queue which would keep the connection alive.
However, if those calls are no-reply calls (such as those carrying
stream data), the remote party knows the connection is alive but since
we don't get any reply from it, we think the connection is dead.
This is most visible in tunnelled migration. If it happens to be longer
than keepalive timeout (30s by default), it may be unexpectedly aborted
because the connection is considered to be dead.
With this patch, we only discard non-blocking calls when the last call
with a thread is completed and thus there is no thread left to keep
sending the remaining non-blocking calls.
In some cases (spotted with broken connection during tunneled migration)
we were overwriting the original error with worse or even misleading
errors generated when we were cleaning up after failed migration.
The docs for virConnectSetKeepAlive() advertise that this function
should be able to disable keepalives on negative or zero interval time.
This patch removes the check that prohibited this and adds code to
disable keepalives on negative/zero interval.
* src/libvirt.c: virConnectSetKeepAlive(): - remove check for negative
values
* src/rpc/virnetclient.c
* src/rpc/virnetclient.h: - add virNetClientKeepAliveStop() to disable
keepalive messages
* src/remote/remote_driver.c: remoteSetKeepAlive(): -add ability to
disable keepalives
This patch resolves https://bugzilla.redhat.com/show_bug.cgi?id=815270
The function virNetDevMacVLanVPortProfileRegisterCallback() takes an
arg "virtPortProfile", and was checking it for non-NULL before using
it. However, the prototype for
virNetDevMacVLanPortProfileRegisterCallback had marked that arg with
ATTRIBUTE_NONNULL(). Contrary to what one may think,
ATTRIBUTE_NONNULL() does not provide any guarantee that an arg marked
as such really is always non-null; the only effect to the code
generated by gcc, is that gcc *assumes* it is non-NULL; this results
in, for example, the check for a non-NULL value being optimized out.
(Unfortunately, this code removal only occurs when optimization is
enabled, and I am in the habit of doing local builds with optimization
off to ease debugging, so the bug didn't show up in my earlier local
testing).
In general, virPortProfile might always be NULL, so it shouldn't be
marked as ATTRIBUTE_NONNULL. One other function prototype made this
same error, so this patch fixes it as well.
Add 2 new functions to the virSocketAddr 'class':
- virSocketAddrEqual: tests whether two IP addresses and their ports are equal
- virSocketaddSetIPv4Addr: set a virSocketAddr given a 32 bit int
This patch improves the previously added virAtomicInt implementation
by using gcc-builtins if possible. The needed builtins are available
since GCC >= 4.1. At least the 4.0 docs don't mention them.
vboxArray is not castable to a COM item type. vboxArray is a
wrapper around the XPCOM and MSCOM specific array handling.
In this case we can avoid passing NULL as an empty array to
IMachine::Delete by passing a dummy IMedium* array with a single
NULL item.
In order to track a block copy job across libvirtd restarts, we
need to save internal XML that tracks the name of the file
holding the mirror. Displaying this name in dumpxml might also
be useful to the user, even if we don't yet have a way to (re-)
start a domain with mirroring enabled up front. This is done
with a new <mirror> sub-element to <disk>, as in:
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/original.img'/>
<mirror file='/var/lib/libvirt/images/copy.img' format='qcow2' ready='yes'/>
...
</disk>
For now, the element is output-only, in live domains; it is ignored
when defining a domain or hot-plugging a disk (since those contexts
use VIR_DOMAIN_XML_INACTIVE in parsing). The 'ready' attribute appears
when libvirt knows that the job has changed from the initial pulling
phase over to the mirroring phase, although absence of the attribute
is not a sure indicator of the current phase. If we come up with a way
to make qemu start with mirroring enabled, we can relax the xml
restriction, and allow <mirror> (but not attribute 'ready') on input.
Testing active-only XML meant tweaking the testsuite slightly, but it
was worth it.
* docs/schemas/domaincommon.rng (diskspec): Add diskMirror.
* docs/formatdomain.html.in (elementsDisks): Document it.
* src/conf/domain_conf.h (_virDomainDiskDef): New members.
* src/conf/domain_conf.c (virDomainDiskDefFree): Clean them.
(virDomainDiskDefParseXML): Parse them, but only internally.
(virDomainDiskDefFormat): Output them.
* tests/qemuxml2argvdata/qemuxml2argv-disk-mirror.xml: New test file.
* tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-mirror.xml: Likewise.
* tests/qemuxml2xmltest.c (testInfo): Alter members.
(testCompareXMLToXMLHelper): Allow more test control.
(mymain): Run new test.
This patch introduces a new block job, useful for live storage
migration using pre-copy streaming. Justification for including
this under virDomainBlockRebase rather than adding a new command
includes: 1) there are now two possible block jobs in qemu, with
virDomainBlockRebase starting either type of command, and
virDomainBlockJobInfo and virDomainBlockJobAbort working to end
either type; 2) reusing this command allows distros to backport
this feature to the libvirt 0.9.10 API without a .so bump.
Note that a future patch may add a more powerful interface named
virDomainBlockJobCopy, dedicated to just the block copy job, in
order to expose even more options (such as setting an arbitrary
format type for the destination without having to probe it from a
pre-existing destination file); adding a new command for targetting
just block copy would be similar to how we already have
virDomainBlockPull for targetting just the block pull job.
Using a live VM with the backing chain:
base <- snap1 <- snap2
as the starting point, we have:
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY)
creates /path/to/copy with the same format as snap2, with no backing
file, so entire chain is copied and flattened
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_COPY_RAW)
creates /path/to/copy as a raw file, so entire chain is copied and
flattened
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_SHALLOW)
creates /path/to/copy with the same format as snap2, but with snap1 as
a backing file, so only snap2 is copied.
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT)
reuse existing /path/to/copy (must have empty contents, and format is
probed[*] from the metadata), and copy the full chain
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT|
VIR_DOMAIN_BLOCK_REBASE_SHALLOW)
reuse existing /path/to/copy (contents must be identical to snap1,
and format is probed[*] from the metadata), and copy only the contents
of snap2
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT|
VIR_DOMAIN_BLOCK_REBASE_SHALLOW|VIR_DOMAIN_BLOCK_REBASE_COPY_RAW)
reuse existing /path/to/copy (must be raw volume with contents
identical to snap1), and copy only the contents of snap2
Less useful combinations:
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_SHALLOW|
VIR_DOMAIN_BLOCK_REBASE_COPY_RAW)
fail if source is not raw, otherwise create /path/to/copy as raw and
the single file is copied (no chain involved)
- virDomainBlockRebase(dom, disk, "/path/to/copy", 0,
VIR_DOMAIN_BLOCK_REBASE_COPY|VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT|
VIR_DOMAIN_BLOCK_REBASE_COPY_RAW)
makes little sense: the destination must be raw but have no contents,
meaning that it is an empty file, so there is nothing to reuse
The other three flags are rejected without VIR_DOMAIN_BLOCK_COPY.
[*] Note that probing an existing file for its format can be a security
risk _if_ there is a possibility that the existing file is 'raw', in
which case the guest can manipulate the file to appear like some other
format. But, by virtue of the VIR_DOMAIN_BLOCK_REBASE_COPY_RAW flag,
it is possible to avoid probing of raw files, at which point, probing
of any remaining file type is no longer a security risk.
It would be nice if we could issue an event when pivoting from phase 1
to phase 2, but qemu hasn't implemented that, and we would have to poll
in order to synthesize it ourselves. Meanwhile, qemu will give us a
distinct job info and completion event when we either cancel or pivot
to end the job. Pivoting is accomplished via the new:
virDomainBlockJobAbort(dom, disk, VIR_DOMAIN_BLOCK_JOB_ABORT_PIVOT)
Management applications can pre-create the copy with a relative
backing file name, and use the VIR_DOMAIN_BLOCK_REBASE_REUSE_EXT
flag to have qemu reuse the metadata; if the management application
also copies the backing files to a new location, this can be used
to perform live storage migration of an entire backing chain.
* include/libvirt/libvirt.h.in (VIR_DOMAIN_BLOCK_JOB_TYPE_COPY):
New block job type.
(virDomainBlockJobAbortFlags, virDomainBlockRebaseFlags): New enums.
* src/libvirt.c (virDomainBlockRebase): Document the new flags,
and implement general restrictions on flag combinations.
(virDomainBlockJobAbort): Document the new flag.
(virDomainSaveFlags, virDomainSnapshotCreateXML)
(virDomainRevertToSnapshot, virDomainDetachDeviceFlags): Document
restrictions.
* include/libvirt/virterror.h (VIR_ERR_BLOCK_COPY_ACTIVE): New
error.
* src/util/virterror.c (virErrorMsg): Define it.
This patch modifies the CPU comparrison function to report the
incompatibilities in more detail to ease identification of problems.
* src/cpu/cpu.h:
cpuGuestData(): Add argument to return detailed error message.
* src/cpu/cpu.c:
cpuGuestData(): Add passthrough for error argument.
* src/cpu/cpu_x86.c
x86FeatureNames(): Add function to convert a CPU definition to flag
names.
x86Compute(): - Add error message parameter
- Add macro for reporting detailed error messages.
- Improve error reporting.
- Simplify calculation of forbidden flags.
x86DataIteratorInit():
x86cpuidMatchAny(): Remove functions that are no longer needed.
* src/qemu/qemu_command.c:
qemuBuildCpuArgStr(): - Modify for new function prototype
- Add detailed error reports
- Change error code on incompatible processors
to VIR_ERR_CONFIG_UNSUPPORTED instead of
internal error
* tests/cputest.c:
cpuTestGuestData(): Modify for new function prototype
virThreadSelf tries to access the virThreadPtr stored in TLS for the
current thread via TlsGetValue. When virThreadSelf is called on a thread
that was not created via virThreadCreate (e.g. the main thread) then
TlsGetValue returns NULL as TlsAlloc initializes TLS slots to NULL.
virThreadSelf can be called on the main thread via this call chain from
virsh
vshDeinit
virEventAddTimeout
virEventPollAddTimeout
virEventPollInterruptLocked
virThreadIsSelf
triggering a segfault as virThreadSelf unconditionally dereferences the
return value of TlsGetValue.
Fix this by making virThreadSelf check the TLS slot value for NULL and
setting the given virThreadPtr accordingly.
Reported by Marcel Müller.
POSIX says that sa_sigaction is only safe to use if sa_flags
includes SA_SIGINFO; conversely, sa_handler is only safe to
use when flags excludes that bit. Gnulib doesn't guarantee
an implementation of SA_SIGINFO, but does guarantee that
if SA_SIGINFO is undefined, we can safely define it to 0 as
long as we don't dereference the 2nd or 3rd argument of
any handler otherwise registered via sa_sigaction.
Based on a report by Wen Congyang.
* src/rpc/virnetserver.c (SA_SIGINFO): Stub for mingw.
(virNetServerSignalHandler): Avoid bogus dereference.
(virNetServerFatalSignal, virNetServerNew): Set flags properly.
(virNetServerAddSignalHandler): Drop unneeded #ifdef.
I almost copied-and-pasted some redundant () into my new code,
and figured a general cleanup prereq patch would be better instead.
No semantic change.
* src/conf/domain_conf.c (virDomainLeaseDefParseXML)
(virDomainDiskDefParseXML, virDomainFSDefParseXML)
(virDomainActualNetDefParseXML, virDomainNetDefParseXML)
(virDomainGraphicsDefParseXML, virDomainVideoAccelDefParseXML)
(virDomainVideoDefParseXML, virDomainHostdevFind)
(virDomainControllerInsertPreAlloced, virDomainDefParseXML)
(virDomainObjParseXML, virDomainCpuSetFormat)
(virDomainCpuSetParse, virDomainDiskDefFormat)
(virDomainActualNetDefFormat, virDomainNetDefFormat)
(virDomainTimerDefFormat, virDomainGraphicsListenDefFormat)
(virDomainDefFormatInternal, virDomainNetGetActualHostdev)
(virDomainNetGetActualBandwidth, virDomainGraphicsGetListen):
Reduce extra ().
Ensure we don't introduce any more lousy integer parsing in new
code, while avoiding a scrub-down of existing legacy code.
Note that we also need to enable sc_prohibit_atoi_atof (see cfg.mk
local-checks-to-skip) before we are bulletproof, but that also
entails scrubbing I'm not ready to do at the moment.
* src/util/util.c (virStrToLong_i, virStrToLong_ui)
(virStrToLong_l, virStrToLong_ul, virStrToLong_ll)
(virStrToLong_ull, virStrToDouble): Mark exemptions.
* src/util/virmacaddr.c (virMacAddrParse): Likewise.
* cfg.mk (sc_prohibit_strtol): New syntax check.
(exclude_file_name_regexp--sc_prohibit_strtol): Ignore files that
I'm not willing to fix yet.
(local-checks-to-skip): Re-enable sc_prohibit_atoi_atof.
https://bugzilla.redhat.com/show_bug.cgi?id=617711 reported that
even with my recent patched to allow <memory unit='G'>1</memory>,
people can still get away with trying <memory>1G</memory> and
silently get <memory unit='KiB'>1</memory> instead. While
virt-xml-validate catches the error, our C parser did not.
Not to mention that it's always fun to fix bugs while reducing
lines of code. :)
* src/conf/domain_conf.c (virDomainParseMemory): Check for parse error.
(virDomainDefParseXML): Avoid strtoll.
* src/conf/storage_conf.c (virStorageDefParsePerms): Likewise.
* src/util/xml.c (virXPathLongBase, virXPathULongBase)
(virXPathULongLong, virXPathLongLong): Likewise.
Commit 78345c68 makes at least gcc 4.1.2 on RHEL 5 complain:
cc1: warnings being treated as errors
In file included from vbox/vbox_V4_0.c:13:
vbox/vbox_tmpl.c: In function 'vboxDomainUndefineFlags':
vbox/vbox_tmpl.c:5298: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
* src/vbox/vbox_tmpl.c (vboxDomainUndefineFlags): Use union to
avoid compiler warning.
DBus connection. The HAL device code further requires that
the DBus connection is integrated with the event loop and
provides such glue logic itself.
The forthcoming FirewallD integration also requires a
dbus connection with event loop integration. Thus we need
to pull the current event loop glue out of the HAL driver.
Thus we create src/util/virdbus.{c,h} files. This contains
just one method virDBusGetSystemBus() which obtains a handle
to the single shared system bus instance, with event glue
automagically setup.
Fix the support for trusted DHCP server in the ebtables code's
hard-coded function applying DHCP only filtering rules:
Rather than using a char * use the more flexible
virNWFilterVarValuePtr that contains the trusted DHCP server(s)
IP address. Process all entries.
Since all callers so far provided NULL as parameter, no changes
are necessary in any other code.
Currently upon a migration a callback is created when a 802.1qbg link
is set to PREASSOCIATE, this should not happen because this is a no-op
on most switches, and does not lead to an ASSOCIATE state. This patch
only creates callbacks when CREATE or RESTORE is requested. Migration
and libvirtd restart scenarios are already handled elsewhere.
Signed-off-by: D. Herrendoerfer <d.herrendoerfer@herrendoerfer.name>
The below patch fixes the following memory leak.
==20624== 24 bytes in 2 blocks are definitely lost in loss record 532 of 1,867
==20624== at 0x4A05E46: malloc (vg_replace_malloc.c:195)
==20624== by 0x38EC27FC01: strdup (strdup.c:43)
==20624== by 0x4EB6BA3: virDomainChrSourceDefCopy (domain_conf.c:1122)
==20624== by 0x495D76: qemuProcessFindCharDevicePTYs (qemu_process.c:1497)
==20624== by 0x498321: qemuProcessWaitForMonitor (qemu_process.c:1258)
==20624== by 0x49B5F9: qemuProcessStart (qemu_process.c:3652)
==20624== by 0x468B5C: qemuDomainObjStart (qemu_driver.c:4753)
==20624== by 0x469171: qemuDomainStartWithFlags (qemu_driver.c:4810)
==20624== by 0x4F21735: virDomainCreate (libvirt.c:8153)
==20624== by 0x4302BF: remoteDispatchDomainCreateHelper (remote_dispatch.h:852)
==20624== by 0x4F72C14: virNetServerProgramDispatch (virnetserverprogram.c:416)
==20624== by 0x4F6D690: virNetServerHandleJob (virnetserver.c:164)
==20624== by 0x4E8F43D: virThreadPoolWorker (threadpool.c:144)
==20624== by 0x4E8EAB5: virThreadHelper (threads-pthread.c:161)
==20624== by 0x38EC606CCA: start_thread (pthread_create.c:301)
==20624== by 0x38EC2E0C2C: clone (clone.S:115)
Most of our errors complaining about an inability to support a
particular action due to qemu limitations used CONFIG_UNSUPPORTED,
but we had a few outliers. Reported by Jiri Denemark.
* src/qemu/qemu_command.c (qemuBuildDriveDevStr): Prefer
CONFIG_UNSUPPORTED.
* src/qemu/qemu_driver.c (qemuDomainReboot)
(qemuDomainBlockJobImpl): Likewise.
* src/qemu/qemu_hotplug.c (qemuDomainAttachPciControllerDevice):
Likewise.
* src/qemu/qemu_monitor.c (qemuMonitorTransaction)
(qemuMonitorBlockJob, qemuMonitorSystemWakeup): Likewise.
So that a domain xml which doesn't have "placement" specified, but
"cpuset" is specified, could be parsed. And in this case, the
"placement" mode will be set as "static".
The objects (domain, pool, network, etc) for testing are defined/
started each time when opening a connect to test driver, and thus
the UUID for the objects will be generated each time, with different
values. e.g.
% for i in {1..3}; do ./tools/virsh --connect \
test:///default dumpxml test | grep uuid; done
<uuid>a1b6ee1f-97de-f0ee-617a-0cdb74947df5</uuid>
<uuid>ee68d7d2-3eb9-593e-2769-797ce1f4c4aa</uuid>
<uuid>fecb1d3a-918a-8412-e534-76192cf32b18</uuid>
It's the potential bug which can cause operations like below to fail:
$ virsh -c test:///default dumpxml test > test.xml
[ Some modificatons, though it's not supported, but it should work ]
$ virsh -c test:///default define test.xml
This patch set fixed UUID for objects which support it. (domain,
pool, network).
A "ide-drive" device can be either a hard disk or a CD-ROM,
if there is ",media=cdrom" specified for the backend, it's
a CD-ROM, otherwise it's a hard disk.
Upstream qemu splitted "ide-drive" into "ide-hd" and "ide-cd"
since commit 1f56e32, and ",media=cdrom" is not required for
ide-cd anymore. "ide-drive" is still supported for backwards
compatibility, but no doubt we should go foward.
A "scsi-disk" device can be either a hard disk or a CD-ROM,
if there is ",media=cdrom" specified for the backend, it's
a CD-ROM, otherwise it's a hard disk.
But upstream qemu splitted "scsi-disk" into "scsi-hd" and
"scsi-cd" since commit b443ae, and ",media=cdrom" is not
required for scsi-cd anymore. "scsi-disk" is still supported
for backwards compatibility, but no doubt we should go
foward.
If console[0] is an alias for serial[0], do not enforce the former to
have a PTY source type. This breaks serial consoles on stdio and makes
no sense.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
When using the xm/xend stack to manage instances there is a bug
that causes the emulated interfaces to be unusable when the vif
config contains type=ioemu.
The current code already has a special quirk to not use this
keyword if no specific model is given for the emulated NIC
(defaulting to rtl8139).
Essentially it works because regardless of the type argument,i
the Xen stack always creates emulated and paravirt interfaces and
lets the guest decide which one to use. So neither xl nor xm stack
actually require the type keyword for emulated NICs.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Currently, we have 3 boolean arguments we have to pass
to qemuProcessStart(). As libvirt grows it is harder and harder
to remember them and their position. Therefore we should
switch to flags instead.
lvcreate want's the parent pool's name, not the pool path
lvchange and lvremove want lv specified as $vgname/$lvname
This largely worked before because these commands strip off a
starting /dev. But https://bugzilla.redhat.com/show_bug.cgi?id=714986
is from a user using a 'nested VG' that was having problems.
I couldn't find any info on nested LVM and the reporter never responded,
but I reproduced with XML that specified a valid source name, and
set target path to a symlink.
As explained in previous patch, numad will balance the affinity
dynamically, so reflecting the cpuset from numad at the first
time doesn't make much case, and may just could cause confusion.
Instead of returning a CPUs list, numad returns NUMA node
list instead, this patch is to convert the node list to
cpumap before affinity setting. Otherwise, the domain
processes will be pinned only to CPU[$numa_cell_num],
which will cause significiant performance losses.
Also because numad will balance the affinity dynamically,
reflecting the cpuset from numad back doesn't make much
sense then, and it may just could produce confusion for
the users. Thus the better way is not to reflect it back
to XML. And in this case, it's better to ignore the cpuset
when parsing XML.
The codes to update the cpuset is removed in this patch
incidentally, and there will be a follow up patch to ignore
the manually specified "cpuset" if "placement" is "auto",
and document will be updated too.
The linux-2.6.32 kernel header does not yet define IFLA_VF_MAX and others,
which breaks compiling a new libvirt on old systems like Debian Squeeze.
(I also have to add --without-macvtap --disable-werror --without-virtualport to
./configure to get it to compile.)
Signed-off-by: Philipp Hahn <hahn@univention.de>
Although it should be harmless to do:
disk = disk = def->disks[i]
some not-so-wise compilers may fool around.
Besides, such assignment is useless here.
On newer xend (v3.x and after) there is no state and domid reported
for inactive domains. When initially creating connections this is
handled in various places by assigning domain->id = -1.
But once an instance has been running, the id is set to the current
domain id. And it does not change when the instance is shut down.
So when querying the domain info, the hypervisor driver, which gets
asked first will indicate it cannot find information, then the
xend driver is asked and will set the status to NOSTATE because it
checks for the -1 domain id.
Checking domain/status for 0 seems to be more reliable for that.
One note: I am not sure whether the domain->id also should get set
back to -1 whenever any sub-driver thinks the instance is no longer
running.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=746007
BugLink: http://bugs.launchpad.net/bugs/929626
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
