The lifetime of the virDomainEventState object is tied to
the lifetime of the driver, which in stateless drivers is
tied to the lifetime of the virConnectPtr.
If we add & remove a timer when allocating/freeing the
virDomainEventState object, we can get a situation where
the timer still triggers once after virDomainEventState
has been freed. The timeout callback can't keep a ref
on the event state though, since that would be a circular
reference.
The trick is to only register the timer when a callback
is registered with the event state & remove the timer
when the callback is unregistered.
The demo for the bug is to run
while true ; do date ; ../tools/virsh -q -c test:///default 'shutdown test; undefine test; dominfo test' ; done
prior to this fix, it will frequently hang and / or
crash, or corrupt memory
Currently all drivers using domain events need to provide a callback
for handling a timer to dispatch events in a clean stack. There is
no technical reason for dispatch to go via driver specific code. It
could trivially be dispatched directly from the domain event code,
thus removing tedious boilerplate code from all drivers
Also fix the libxl & xen drivers to pass 'true' when creating the
virDomainEventState, since they run inside the daemon & thus always
expect events to be present.
* src/conf/domain_event.c, src/conf/domain_event.h: Internalize
dispatch of events from timer callback
* src/libxl/libxl_driver.c, src/lxc/lxc_driver.c,
src/qemu/qemu_domain.c, src/qemu/qemu_driver.c,
src/remote/remote_driver.c, src/test/test_driver.c,
src/uml/uml_driver.c, src/vbox/vbox_tmpl.c,
src/xen/xen_driver.c: Remove all timer dispatch functions
When registering a callback for a particular event some callers
need to know how many callbacks already exist for that event.
While it is possible to ask for a count, this is not free from
race conditions when threaded. Thus the API for registering
callbacks should return the count of callbacks. Also rename
virDomainEventStateDeregisterAny to virDomainEventStateDeregisterID
* src/conf/domain_event.c, src/conf/domain_event.h,
src/libvirt_private.syms: Return count of callbacks when
registering callbacks
* src/libxl/libxl_driver.c, src/libxl/libxl_driver.c,
src/qemu/qemu_driver.c, src/remote/remote_driver.c,
src/remote/remote_driver.c, src/uml/uml_driver.c,
src/vbox/vbox_tmpl.c, src/xen/xen_driver.c: Update
for change in APIs
A preparatory patch for DHCP snooping where we want to be able to
differentiate between a VM's interface using the tuple of
<VM UUID, Interface MAC address>. We assume that MAC addresses could
possibly be re-used between different networks (VLANs) thus do not only
want to rely on the MAC address to identify an interface.
At the current 'final destination' in virNWFilterInstantiate I am leaving
the vmuuid parameter as ATTRIBUTE_UNUSED until the DHCP snooping patches arrive.
(we may not post the DHCP snooping patches for 0.9.9, though)
Mostly this is a pretty trivial patch. On the lowest layers, in lxc_driver
and uml_conf, I am passing the virDomainDefPtr around until I am passing
only the VM's uuid into the NWFilter calls.
The virTimestamp and virTimeMs functions in src/util/util.h
duplicate functionality from virtime.h, in a non-async signal
safe manner. Remove them, and convert all code over to the new
APIs.
* src/util/util.c, src/util/util.h: Delete virTimeMs and virTimestamp
* src/lxc/lxc_driver.c, src/qemu/qemu_domain.c,
src/qemu/qemu_driver.c, src/qemu/qemu_migration.c,
src/qemu/qemu_process.c, src/util/event_poll.c: Convert to use
virtime APIs
After the previous patch, there are now some redundant checks.
* src/qemu/qemu_driver.c (qemudDomainGetVcpuPinInfo)
(qemuGetSchedulerParametersFlags): Drop checks now guaranteed by
libvirt.c.
* src/lxc/lxc_driver.c (lxcGetSchedulerParametersFlags):
Likewise.
Add the core functions that implement the functionality of the API.
Suspend is done by using an asynchronous mechanism so that we can return
the status to the caller before the host gets suspended. This asynchronous
operation is achieved by suspending the host in a separate thread of
execution. However, returning the status to the caller is only best-effort,
but not guaranteed.
To resume the host, an RTC alarm is set up (based on how long we want to
suspend) before suspending the host. When this alarm fires, the host
gets woken up.
Suspend-to-RAM operation on a host running Linux can take upto more than 20
seconds, depending on the load of the system. (Freezing of tasks, an operation
preceding any suspend operation, is given up after a 20 second timeout).
And Suspend-to-Disk can take even more time, considering the time required
for compaction, creating the memory image and writing it to disk etc.
So, we do not allow the user to specify a suspend duration of less than 60
seconds, to be on the safer side, since we don't want to prematurely declare
failure when we only had to wait for some more time.
To make lxcSetContainerResources smaller, pull the mem tune
and device ACL setup code out into separate methods
* src/lxc/lxc_controller.c: Introduce lxcSetContainerMemTune
and lxcSetContainerDeviceACL
While LXC does not have the concept of VCPUS, so we can't do
per-VCPU pCPU placement, we can support the VM level CPU
placement. Todo this simply set the CPU affinity of the LXC
controller at startup. All child processes will inherit this
affinity.
* src/lxc/lxc_controller.c: Set process affinity
Support creation of macvlan devices for LXC containers. Do not
allow setting of bandwidth controls or vport profiles due to the
complication that there is no host side visible device to work
with.
* src/lxc/lxc_driver.c: Support type=direct interfaces
The current lxcSetupInterfaces() method directly performs setup
of the bridge devices. Since it will shortly need to also create
macvlan devices, move the bridge related code into a separate
method
* src/lxc/lxc_driver.c: Split lxcSetupInterfaces() to create a
new lxcSetupInterfaceBridge()
Move the virNetDevSetName and virNetDevSetNamespace APIs out
of LXC's veth.c and into virnetdev.c.
Move the remaining content of the file to src/util/virnetdevveth.c
* src/lxc/veth.c: Rename to src/util/virnetdevveth.c
* src/lxc/veth.h: Rename to src/util/virnetdevveth.h
* src/util/virnetdev.c, src/util/virnetdev.h: Add
virNetDevSetName and virNetDevSetNamespace
* src/lxc/lxc_container.c, src/lxc/lxc_controller.c,
src/lxc/lxc_driver.c: Update include paths
The src/lxc/veth.c file contains APIs for managing veth devices,
but some of the APIs duplicate stuff from src/util/virnetdev.h.
Delete thed duplicate APIs and rename the remaining ones to
follow virNetDevVethXXXX
* src/lxc/veth.c, src/lxc/veth.h: Rename APIs & delete duplicates
* src/lxc/lxc_container.c, src/lxc/lxc_controller.c,
src/lxc/lxc_driver.c: Update for API renaming
Following the renaming of the bridge management APIs, we can now
split the source file into 3 corresponding pieces
* src/util/virnetdev.c: APIs for any type of network interface
* src/util/virnetdevbridge.c: APIs for bridge interfaces
* src/util/virnetdevtap.c: APIs for TAP interfaces
* src/util/virnetdev.c, src/util/virnetdev.h,
src/util/virnetdevbridge.c, src/util/virnetdevbridge.h,
src/util/virnetdevtap.c, src/util/virnetdevtap.h: Copied
from bridge.{c,h}
* src/util/bridge.c, src/util/bridge.h: Split into 3 pieces
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
src/openvz/openvz_driver.c, src/qemu/qemu_command.c,
src/qemu/qemu_conf.h, src/uml/uml_conf.c, src/uml/uml_conf.h,
src/uml/uml_driver.c: Update #include directives
The existing brXXX APIs in src/util/bridge.h are renamed to
follow one of three different conventions
- virNetDevXXX - operations for any type of interface
- virNetDevBridgeXXX - operations for bridge interfaces
- virNetDevTapXXX - operations for tap interfaces
* src/util/bridge.h, src/util/bridge.c: Rename all APIs
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
src/qemu/qemu_command.c, src/uml/uml_conf.c,
src/uml/uml_driver.c: Update for API renaming
Currently every caller of the brXXX APIs has to store the returned
errno value and then raise an error message. This results in
inconsistent error messages across drivers, additional burden on
the callers and makes the error reporting inaccurate since it is
hard to distinguish different scenarios from 1 errno value.
* src/util/bridge.c: Raise errors instead of returning errnos
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
src/qemu/qemu_command.c, src/uml/uml_conf.c,
src/uml/uml_driver.c: Remove error reporting code
The bridge management APIs in src/util/bridge.c require a brControl
object to be passed around. This holds the file descriptor for the
control socket. This extra object complicates use of the API for
only a minor efficiency gain, which is in turn entirely offset by
the need to fork/exec the brctl command for STP configuration.
This patch removes the 'brControl' object entirely, instead opening
the control socket & closing it again within the scope of each method.
The parameter names for the APIs are also made to consistently use
'brname' for bridge device name, and 'ifname' for an interface
device name. Finally annotations are added for non-NULL parameters
and return check validation
* src/util/bridge.c, src/util/bridge.h: Remove brControl object
and update API parameter names & annotations.
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
src/uml/uml_conf.h, src/uml/uml_conf.c, src/uml/uml_driver.c,
src/qemu/qemu_command.c, src/qemu/qemu_conf.h,
src/qemu/qemu_driver.c: Remove reference to 'brControl' object
I got this weird failure:
error: Failed to start domain simple
error: internal error cannot mix caller fds with blocking execution
and tracked it down to a use-after-free - virCommandSetOutputFD
was storing the address of a stack-local variable, which then
went out of scope before the virCommandRun that dereferenced it.
Bug introduced in commit 451cfd05 (0.9.2).
* src/lxc/lxc_driver.c (lxcBuildControllerCmd): Move log fd
registration...
(lxcVmStart): ...to caller.
Based on a Coverity report - the return value of waitpid() should
always be checked, to avoid problems with leaking resources.
* src/lxc/lxc_controller.c (lxcControllerRun): Use simpler virPidAbort.
The default console type may vary based on the OS type. ie a Xen
paravirt guests wants a 'xen' console, while a fullvirt guests
wants a 'serial' console.
A plain integer default console type in the capabilities does
not suffice. Instead introduce a callback that is passed the
OS type.
* src/conf/capabilities.h: Use a callback for default console
type
* src/conf/domain_conf.c, src/conf/domain_conf.h: Use callback
for default console type. Add missing LXC/OpenVZ console types.
* src/esx/esx_driver.c, src/libxl/libxl_conf.c,
src/lxc/lxc_conf.c, src/openvz/openvz_conf.c,
src/phyp/phyp_driver.c, src/qemu/qemu_capabilities.c,
src/uml/uml_conf.c, src/vbox/vbox_tmpl.c,
src/vmware/vmware_conf.c, src/xen/xen_hypervisor.c,
src/xenapi/xenapi_driver.c: Set default console type callback
To allow virDomainOpenConsole to access non-primary consoles,
device aliases are required to be set. Until now only the QEMU
driver has done this. Update LXC & UML to set aliases for any
console devices
* src/lxc/lxc_driver.c, src/uml/uml_driver.c: Set aliases
for console devices
Currently the LXC controller only supports setup of a single
text console. This is wired up to the container init's stdio,
as well as /dev/console and /dev/tty1. Extending support for
multiple consoles, means wiring up additional PTYs to /dev/tty2,
/dev/tty3, etc, etc. The LXC controller is passed multiple open
file handles, one for each console requested.
* src/lxc/lxc_container.c, src/lxc/lxc_container.h: Wire up
all the /dev/ttyN links required to symlink to /dev/pts/NN
* src/lxc/lxc_container.h: Open more container side /dev/pts/NN
devices, and adapt event loop to handle I/O from all consoles
* src/lxc/lxc_driver.c: Setup multiple host side PTYs
The current I/O code for LXC uses a hand crafted event loop
to forward I/O between the container & host app, based on
epoll to handle EOF on PTYs. This event loop is not easily
extensible to add more consoles, or monitor other types of
file descriptors.
Remove the custom event loop and replace it with a normal
libvirt event loop. When detecting EOF on a PTY, disable
the event watch on that FD, and fork off a background thread
that does a edge-triggered epoll() on the FD. When the FD
finally shows new incoming data, the thread re-enables the
watch on the FD and exits.
When getting EOF from a read() on the PTY, the existing code
would do waitpid(WNOHANG) to see if the container had exited.
Unfortunately there is a race condition, because even though
the process has closed its stdio handles, it might still
exist.
To deal with this the new event loop uses a SIG_CHILD handler
to perform the waitpid only when the container is known to
have actually exited.
* src/lxc/lxc_controller.c: Rewrite the event loop to use
the standard APIs.
While Xen only has a single paravirt console, UML, and
QEMU both support multiple paravirt consoles. The LXC
driver can also be trivially made to support multiple
consoles. This patch extends the XML to allow multiple
<console> elements in the XML. It also makes the UML
and QEMU drivers support this config.
* src/conf/domain_conf.c, src/conf/domain_conf.h: Allow
multiple <console> devices
* src/lxc/lxc_driver.c, src/xen/xen_driver.c,
src/xenxs/xen_sxpr.c, src/xenxs/xen_xm.c: Update for
internal API changes
* src/security/security_selinux.c, src/security/virt-aa-helper.c:
Only label consoles that aren't a copy of the serial device
* src/qemu/qemu_command.c, src/qemu/qemu_driver.c,
src/qemu/qemu_process.c, src/uml/uml_conf.c,
src/uml/uml_driver.c: Support multiple console devices
* tests/qemuxml2xmltest.c, tests/qemuxml2argvtest.c: Extra
tests for multiple virtio consoles. Set QEMU_CAPS_CHARDEV
for all console /channel tests
* tests/qemuxml2argvdata/qemuxml2argv-channel-virtio-auto.args,
tests/qemuxml2argvdata/qemuxml2argv-channel-virtio.args
tests/qemuxml2argvdata/qemuxml2argv-console-virtio.args: Update
for correct chardev syntax
* tests/qemuxml2argvdata/qemuxml2argv-console-virtio-many.args,
tests/qemuxml2argvdata/qemuxml2argv-console-virtio-many.xml: New
test file
Allow the user to call with nparams too small, per API documentation.
Also, libvirt.c filters out nparams of 0 for scheduler parameters.
* src/lxc/lxc_driver.c (lxcDomainGetMemoryParameters): Allow fewer
than max.
(lxcGetSchedulerParametersFlags): Drop redundant check.
Document the parameter names that will be used by
virDomain{Get,Set}SchedulerParameters{,Flags}, rather than
hard-coding those names in each driver, to match what is
done with memory, blkio, and blockstats parameters.
* include/libvirt/libvirt.h.in (VIR_DOMAIN_SCHEDULER_CPU_SHARES)
(VIR_DOMAIN_SCHEDULER_VCPU_PERIOD)
(VIR_DOMAIN_SCHEDULER_VCPU_QUOTA, VIR_DOMAIN_SCHEDULER_WEIGHT)
(VIR_DOMAIN_SCHEDULER_CAP, VIR_DOMAIN_SCHEDULER_RESERVATION)
(VIR_DOMAIN_SCHEDULER_LIMIT, VIR_DOMAIN_SCHEDULER_SHARES): New
field name macros.
* src/qemu/qemu_driver.c (qemuSetSchedulerParametersFlags)
(qemuGetSchedulerParametersFlags): Use new defines.
* src/test/test_driver.c (testDomainGetSchedulerParamsFlags)
(testDomainSetSchedulerParamsFlags): Likewise.
* src/xen/xen_hypervisor.c (xenHypervisorGetSchedulerParameters)
(xenHypervisorSetSchedulerParameters): Likewise.
* src/xen/xend_internal.c (xenDaemonGetSchedulerParameters)
(xenDaemonSetSchedulerParameters): Likewise.
* src/lxc/lxc_driver.c (lxcSetSchedulerParametersFlags)
(lxcGetSchedulerParametersFlags): Likewise.
* src/esx/esx_driver.c (esxDomainGetSchedulerParametersFlags)
(esxDomainSetSchedulerParametersFlags): Likewise.
* src/libxl/libxl_driver.c (libxlDomainGetSchedulerParametersFlags)
(libxlDomainSetSchedulerParametersFlags): Likewise.
If an LXC VM fails to start, quite a few cleanup paths will
result in the original error message being overwritten. Some
other cleanup paths also forgot to actually terminate the VM.
* src/lxc/lxc_driver.c: Ensure VM is terminated on startup
failure and preserve original error
The LXC code for mounting container filesystems from block devices
tries all filesystems in /etc/filesystems and possibly those in
/proc/filesystems. The regular mount binary, however, first tries
using libblkid to detect the format. Add support for doing the same
in libvirt, since Fedora's /etc/filesystems is missing many formats,
most notably ext4 which is the default filesystem Fedora uses!
* src/Makefile.am: Link libvirt_lxc to libblkid
* src/lxc/lxc_container.c: Probe filesystem format with libblkid
If we looped through /etc/filesystems trying to mount with each
type and failed all options, we forget to actually raise an
error message.
* src/lxc/lxc_container.c: Raise error if unable to detect
the filesystems. Also fix existing error message
The kernel automounter is mostly broken wrt to containers. Most
notably if you start a new filesystem namespace and then attempt
to unmount any autofs filesystem, it will typically fail with a
weird error message like
Failed to unmount '/.oldroot/sys/kernel/security':Too many levels of symbolic links
Attempting to detach the autofs mount using umount2(MNT_DETACH)
will also fail with the same error. Therefore if we get any error on
unmount()ing a filesystem from the old root FS when starting a
container, we must immediately break out and detach the entire
old root filesystem (ignoring any mounts below it).
This has the effect of making the old root filesystem inaccessible
to anything inside the container, but at the cost that the mounts
live on in the kernel until the container exits. Given that SystemD
uses autofs by default, we need LXC to be robust this scenario and
thus this tradeoff is worthwhile.
* src/lxc/lxc_container.c: Detach root filesystem if any umount
operation fails.
The /etc/filesystems file can contain a '*' on the last line to
indicate that /proc/filessystems should be tried next. We have
a check that this '*' only occurs on the last line. Unfortunately
when we then start reading /proc/filesystems, we mistakenly think
we've seen '*' in /proc/filesystems and fail
* src/lxc/lxc_container.c: Skip '*' validation when we're reading
/proc/filesystems
Only some of the return paths of lxcContainerWaitForContinue will
have set errno. In other paths we need to set it manually to avoid
the caller getting a random stale errno value
* src/lxc/lxc_container.c: Set errno in lxcContainerWaitForContinue
Previous commit clears number of items alocated in lxcSetupLoopDevices
if VIR_REALLOC_N fails. In that case, the pointer is not NULL, and
causes leaking FDs that have been allocated.
* src/lxc/lxc_controller.c: revert zeroing array size
If the function lxcSetupLoopDevices(def, &nloopDevs, &loopDevs) failed,
the variable loopDevs will keep a initial NULL value, however, the
function VIR_FORCE_CLOSE(loopDevs[i]) will directly deref it.
This patch also fixes returning a bogous number of devices from
lxcSetupLoopDevices on an error path.
* rc/lxc/lxc_controller.c: fixed a null pointer dereference.
Signed-off-by: Alex Jia <ajia@redhat.com>
Cppcheck detected a syntaxError on lxcDomainInterfaceStats.
* src/lxc/lxc_driver.c: fixed missing '{' in the function lxcDomainInterfaceStats.
Signed-off-by: Alex Jia <ajia@redhat.com>
Based on a report by Coverity. waitpid() can leak resources if it
fails with EINTR, so it should never be used without checking return
status. But we already have a helper function that does that, so
use it in more places.
* src/lxc/lxc_container.c (lxcContainerAvailable): Use safer
virWaitPid.
* daemon/libvirtd.c (daemonForkIntoBackground): Likewise.
* tests/testutils.c (virtTestCaptureProgramOutput, virtTestMain):
Likewise.
* src/libvirt.c (virConnectAuthGainPolkit): Simplify with virCommand.
The glibc ones (intentionally) cannot handle ptys opened in a
devpts not mounted at /dev/pts.
Drop the (un-exported, unused) virFileOpenTtyAt.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
We recently added support for VIR_DOMAIN_START_AUTODESTROY and
an impl to the QEMU driver. It is very desirable to support in
other drivers, so this adds it to LXC and UML
* src/lxc/lxc_conf.h, src/lxc/lxc_driver.c,
src/uml/uml_conf.h, src/uml/uml_driver.c: Wire up autodestroy
functions
Detected by Coverity. We want to increment the size_t counter,
not the pointer to the counter. Bug present since 5f5c6fde (0.9.5).
* src/lxc/lxc_controller.c (lxcSetupLoopDevices): Use correct
precedence.
If using one of the new non-NAT/routed virtual network
configurations, the LXC driver would not know how to
setup the VETH devices. Adding in calls to setup the
"actual" network configuration at VM startup and cleanup
when shutting down fixes this.
* src/lxc/lxc_driver.c: Setup/cleanup actual net devs
When booting a virtual machine with a kernel/initrd it is possible
to pass command line arguments using the <cmdline>...args...</cmdline>
element in the guest XML. These appear to the kernel / init process
in /proc/cmdline.
When booting a container we do not have a custom /proc/cmdline,
but we can easily set an environment variable for it. Ideally
we could pass individual arguments to the init process as a
regular set of 'char *argv[]' parameters, but that would involve
libvirt parsing the <cmdline> XML text. This can easily be added
later, even if we add the env variable now
* docs/drvlxc.html.in: Document env variables passed to LXC
* src/conf/domain_conf.c: Add <cmdline> to be parsed for
guests of type='exe'
* src/lxc/lxc_container.c: Set LIBVIRT_LXC_CMDLINE env var
Currently, the lxc implementation invokes 'ip' and 'ifconfig' commands
inside a container using 'virRun'. That has the side effect of requiring
those commands to be present and to function in a manner consistent with
the usage. Some small roots (such as ttylinux) may not have 'ip' or
'ifconfig'.
This patch replaces the use of these commands with usage of
netdevice. The result is that lxc containers do not have to implement
those commands, and lxc in libvirt is only dependent on the netdevice
interface.
I've tested this patch locally against the ubuntu libvirt version enough
to verify its generally sane. I attempted to build upstream today, but
failed with:
/usr/bin/ld:
../src/.libs/libvirt_driver_qemu.a(libvirt_driver_qemu_la-qemu_domain.o):
undefined reference to symbol 'xmlXPathRegisterNs@@LIBXML2_2.4.30
Thats probably a local issue only, but I wanted to get this patch up and
see what others thought of it. This is ubuntu bug
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/828211 .
Hi,
I'm seeing an issue with udev and libvirt-lxc. Libvirt-lxc creates
/dev/ptmx as a symlink to /dev/pts/ptmx. When udev starts up, it
checks the device type, sees ptmx is 'not right', and replaces it
with a 'proper' ptmx.
In lxc, /dev/ptmx is bind-mounted from /dev/pts/ptmx instead of being
symlinked, so udev sees the right device type and leaves it alone.
A patch like the following seems to work for me. Would there be
any objections to this?
>From 4c5035de52de7e06a0de9c5d0bab8c87a806cba7 Mon Sep 17 00:00:00 2001
From: Ubuntu <ubuntu@domU-12-31-39-14-F0-B3.compute-1.internal>
Date: Wed, 31 Aug 2011 18:15:54 +0000
Subject: [PATCH 1/1] make ptmx a bind mount rather than symlink
udev on some systems checks the device type of /dev/ptmx, and replaces it if
not as expected. The symlink created by libvirt-lxc therefore gets replaced.
By creating it as a bind mount, the device type is correct and udev leaves it
alone.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
s/VIR_ERR_NO_SUPPORT/VIR_ERR_OPERATION_INVALID/
Special case is changes on lxcDomainInterfaceStats, if it's not
implemented on the platform, prints error like:
lxcError(VIR_ERR_OPERATION_INVALID, "%s",
_("interface stats not implemented on this platform"));
As the function is supported by driver actually, error like
VIR_ERR_NO_SUPPORT is confused.
The functions for manipulating pidfiles are in util/util.{c,h}.
We will shortly be adding some further pidfile related functions.
To avoid further growing util.c, this moves the pidfile related
functions into a dedicated virpidfile.{c,h}. The functions are
also all renamed to have 'virPidFile' as their name prefix
* util/util.h, util/util.c: Remove all pidfile code
* util/virpidfile.c, util/virpidfile.h: Add new APIs for pidfile
handling.
* lxc/lxc_controller.c, lxc/lxc_driver.c, network/bridge_driver.c,
qemu/qemu_process.c: Add virpidfile.h include and adapt for API
renames
A previous commit gave the LXC driver the ability to mount
block devices for the container filesystem. Through use of
the loopback device functionality, we can build on this to
support use of plain file images for LXC filesytems.
By setting the LO_FLAGS_AUTOCLEAR flag we can ensure that
the loop device automatically disappears when the container
dies / shuts down
* src/lxc/lxc_container.c: Raise error if we see a file
based filesystem, since it should have been turned into
a loopback device already
* src/lxc/lxc_controller.c: Rewrite any filesystems of
type=file, into type=block, by binding the file image
to a free loop device
Currently the LXC driver can only populate filesystems from
host filesystems, using bind mounts. This patch allows host
block devices to be mounted. It autodetects the filesystem
format at mount time, and adds the block device to the cgroups
ACL. Example usage is
<filesystem type='block' accessmode='passthrough'>
<source dev='/dev/sda1'/>
<target dir='/home'/>
</filesystem>
* src/lxc/lxc_container.c: Mount block device filesystems
* src/lxc/lxc_controller.c: Add block device filesystems
to cgroups ACL
An application container shouldn't get a private /dev. Fix
the regression from 6d37888e6a
* src/lxc/lxc_container.c: Don't mount /dev for app containers
Revert 6a1f5f568f. Now that libvirt_iohelper takes fds by
inheritance rather than by open() (commit 1eb66479), there is
no longer a race where the parent can unlink() a file prior to
the iohelper open()ing the same file. From there, it makes
more sense to have the callers both create and unlink, rather
than the caller create and the stream unlink, since the latter
was only needed when iohelper had to do the unlink.
* src/fdstream.h (virFDStreamOpenFile, virFDStreamCreateFile):
Callers are responsible for deletion.
* src/fdstream.c (virFDStreamOpenFileInternal): Don't leak created
file on failure.
(virFDStreamOpenFile, virFDStreamCreateFile): Drop parameter.
* src/lxc/lxc_driver.c (lxcDomainOpenConsole): Update callers.
* src/qemu/qemu_driver.c (qemuDomainScreenshot)
(qemuDomainOpenConsole): Likewise.
* src/storage/storage_driver.c (storageVolumeDownload)
(storageVolumeUpload): Likewise.
* src/uml/uml_driver.c (umlDomainOpenConsole): Likewise.
* src/vbox/vbox_tmpl.c (vboxDomainScreenshot): Likewise.
* src/xen/xen_driver.c (xenUnifiedDomainOpenConsole): Likewise.
Although most functions in libvirt return 0 on success and < 0 on
failure, there are a few functions lingering around that return errno
(a positive value) on failure, and sometimes code calling those
functions incorrectly assumes the <0 standard. I noticed one of these
the other day when auditing networkStartDhcpDaemon after Guido Gunther
found a place where success was improperly returned on failure (that
patch has been acked and is pending a push). The problem was that it
expected the return value from virFileReadPid to be < 0 on failure,
but it was actually positive (it was also neglected to set the return
code in this case, similar to the bug found by Guido).
This all led to the fact that *all* of the virFile*Pid functions in
util.c are returning errno on failure. This patch remedies that
problem by changing them all to return -errno on failure, and makes
any necessary changes to callers of the functions. (In the meantime, I
also properly set the return code on failure of virFileReadPid in
networkStartDhcpDaemon).
A container should not be allowed to modify stuff in /sys
or /proc/sys so make them readonly. Make /selinux readonly
so that containers think that selinux is disabled.
Honour the readonly flag when mounting container filesystems
from the guest XML config
* src/lxc/lxc_container.c: Support readonly mounts
Even in non-virtual root filesystem mode we should be mounting
more than just a new /proc. Refactor lxcContainerMountBasicFS
so that it does everything except for /dev and /dev/pts moving
that into lxcContainerMountDevFS. Pass in a source prefix
to lxcContainerMountBasicFS() so it can be used in both shared
root and private root modes.
* src/lxc/lxc_container.c: Unify mounting code for special
filesystems
The bind mount setup is about to get more complicated.
To avoid having to deal with several copies, pull it
out into a separate lxcContainerMountFSBind method.
Also pull out the iteration over container filesystems,
so that it will be easier to drop in support for non-bind
mount filesystems
* src/lxc/lxc_container.c: Pull bind mount code out into
lxcContainerMountFSBind
When libvirtd restarts it will attempt to reconnect to existing
LXC containers. If it loads a XML state file for the container
the container will appear running. If we fail to read the PID
file, or fail to connect to the LXC monitor, we should be killing
off the guest, but if the VMs cgroup does not exist any more,
cleanup will get skipped. Reading the PID file is also pointless
since the PID is in the XML statefile
In lxcReconnectVM we do not need to read the PID file. If part
of the reconnect process fails we need to run the VM terminate
code as a safety net.
In lxcVMTerminate, if we can't obtain the VM cgroup, we know
the process has died, but we must still run lxcVMCleanup to
clear out the virDomainObjPtr live state
* src/lxc/lxc_driver.c: Fix cleanup of dead VMs on restart
The previous patches only cleaned up ATTRIBUTE_UNUSED flags cases;
auditing the drivers found other places where flags was being used
but not validated. In particular, domainGetXMLDesc had issues with
clients accepting a different set of flags than the common
virDomainDefFormat helper function.
* src/conf/domain_conf.c (virDomainDefFormat): Add common flag check.
* src/uml/uml_driver.c (umlDomainAttachDeviceFlags)
(umlDomainDetachDeviceFlags): Reject unknown
flags.
* src/vbox/vbox_tmpl.c (vboxDomainGetXMLDesc)
(vboxDomainAttachDeviceFlags)
(vboxDomainDetachDeviceFlags): Likewise.
* src/qemu/qemu_driver.c (qemudDomainMemoryPeek): Likewise.
(qemuDomainGetXMLDesc): Document common flag handling.
* src/libxl/libxl_driver.c (libxlDomainGetXMLDesc): Likewise.
* src/lxc/lxc_driver.c (lxcDomainGetXMLDesc): Likewise.
* src/openvz/openvz_driver.c (openvzDomainGetXMLDesc): Likewise.
* src/phyp/phyp_driver.c (phypDomainGetXMLDesc): Likewise.
* src/test/test_driver.c (testDomainGetXMLDesc): Likewise.
* src/vmware/vmware_driver.c (vmwareDomainGetXMLDesc): Likewise.
* src/xenapi/xenapi_driver.c (xenapiDomainGetXMLDesc): Likewise.
* src/lxc/lxc_driver.c (lxcOpen, lxcDomainSetMemoryParameters)
(lxcDomainGetMemoryParameters): Reject unknown flags.
* src/lxc/lxc_container.c (lxcContainerStart): Rename flags to
cflags to reflect that it is not tied to libvirt.
The drivers were accepting domain configs without checking if those
were actually meant for them. For example the LXC driver happily
accepts configs with type QEMU.
Add a check for the expected domain types to the virDomainDefParse*
functions.
Some callers expected virFileMakePath to set errno, some expected
it to return an errno value. Unify this to return 0 on success and
-1 on error. Set errno to report detailed error information.
Also optimize virFileMakePath if stat fails with an errno different
from ENOENT.
To avoid regressions, we let callers specify whether to require a
minor and micro version. Callers that were parsing uname() output
benefit from defaulting to 0, whereas callers that were parsing
version strings from other sources should not change in behavior.
* src/util/util.c (virParseVersionString): Allow caller to choose
whether to fail if minor or micro is missing.
* src/util/util.h (virParseVersionString): Update signature.
* src/esx/esx_driver.c (esxGetVersion): Update callers.
* src/lxc/lxc_driver.c (lxcVersion): Likewise.
* src/openvz/openvz_conf.c (openvzExtractVersionInfo): Likewise.
* src/uml/uml_driver.c (umlGetVersion): Likewise.
* src/vbox/vbox_MSCOMGlue.c (vboxLookupVersionInRegistry):
Likewise.
* src/vbox/vbox_tmpl.c (vboxExtractVersion): Likewise.
* src/vmware/vmware_conf.c (vmwareExtractVersion): Likewise.
* src/xenapi/xenapi_driver.c (xenapiGetVersion): Likewise.
Reported by Matthias Bolte.
Since we virEventRegisterDefaultImpl is now a public API, callers need
a way to invoke the default registered Handle and Timeout functions. We
already have general functions for these internally, so promote
them to the public API.
v2:
Actually add APIs to libvirt.h
The LXC driver networking uses veth device pairs. These can
be easily hooked into the network filtering code.
* src/lxc/lxc_driver.c: Add calls to setup/teardown nwfilter
The algorithm for autoassigning vethXXX devices, was always
skipping over the starting dev index when finding a free
name for the guest device. This should only be done if the host
device was autoallocated.
* src/lxc/veth.c: Don't skip over veth indexes
Add a simple handshake with the lxc_controller process so we can detect
process startup failures. We do this by adding a new --handshake cli arg
to lxc_controller for passing a file descriptor. If the process fails to
launch, we scrape all output from the logfile and report it to the user.
Seems reasonable to have all command wrappers in the same place
v2:
Dont move SetInherit
v3:
Comment spelling fix
Adjust WARN0 comment
Remove spurious #include movement
Don't include sys/types.h
Combine virExec enums
Signed-off-by: Cole Robinson <crobinso@redhat.com>
This patch seperate the domain config loading just as qemu driver
does, first loading config of running or trasient domains, then
of persistent inactive domains. And only try to reconnect the
monitor of running domains, so that it won't always throws errors
saying can't connect to domain monitor.
And as "virDomainLoadConfig->virDomainAssignDef->virDomainObjAssignDef",
already do things like "vm->newDef = def", removed the codes
in "lxcReconnectVM" that does the same work.
Well, the remaining drivers that already had the get/set
scheduler parameter functionality to begin with.
For now, this blindly treats VIR_DOMAIN_SCHEDINFO_CURRENT as
the only supported operation for these 5 domains; it will
take domain-specific patches if more specific behavior is
preferred.
* src/esx/esx_driver.c (esxDomainGetSchedulerParameters)
(esxDomainSetSchedulerParameters): Move guts...
(esxDomainGetSchedulerParametersFlags)
(esxDomainSetSchedulerParametersFlags): ...to new functions.
* src/libxl/libxl_driver.c (libxlDomainGetSchedulerParameters)
(libxlDomainSetSchedulerParameters)
(libxlDomainGetSchedulerParametersFlags)
(libxlDomainSetSchedulerParametersFlags): Likewise.
* src/lxc/lxc_driver.c (lxcGetSchedulerParameters)
(lxcSetSchedulerParameters, lxcGetSchedulerParametersFlags)
(lxcSetSchedulerParametersFlags): Likewise.
* src/test/test_driver.c (testDomainGetSchedulerParams)
(testDomainSetSchedulerParams, testDomainGetSchedulerParamsFlags)
(testDomainSetSchedulerParamsFlags): Likewise.
* src/xen/xen_driver.c (xenUnifiedDomainGetSchedulerParameters)
(xenUnifiedDomainSetSchedulerParameters)
(xenUnifiedDomainGetSchedulerParametersFlags)
(xenUnifiedDomainSetSchedulerParametersFlags): Likewise.
Improve invalid argument checks in the size query case. The drivers already
relied on this unchecked behavior.
Relax the implementation of virDomainGet(Memory|Blkio)MemoryParameters
in the drivers and allow to pass more memory than necessary for all
parameters.
params and nparams are essential and cannot be NULL. Check this in
libvirt.c and remove redundant checks from the drivers (e.g. xend).
Instead of enforcing that nparams must point to exact same value as
returned by virDomainGetSchedulerType relax this to a lower bound
check. This is what some drivers (e.g. xen hypervisor and esx)
already did. Other drivers (e.g. xend) didn't check nparams at all
and assumed that there is enough space in params.
Unify the behavior in all drivers to a lower bound check and update
nparams to the number of valid values in params on success.
Change all the driver struct initializers to use the
C99 style, leaving out unused fields. This will make
it possible to add new APIs without changing every
driver. eg change:
qemudDomainResume, /* domainResume */
qemudDomainShutdown, /* domainShutdown */
NULL, /* domainReboot */
qemudDomainDestroy, /* domainDestroy */
to
.domainResume = qemudDomainResume,
.domainShutdown = qemudDomainShutdown,
.domainDestroy = qemudDomainDestroy,
And get rid of any existing C99 style initializersr which
set NULL, eg change
.listPools = vboxStorageListPools,
.numOfDefinedPools = NULL,
.listDefinedPools = NULL,
.findPoolSources = NULL,
.poolLookupByName = vboxStoragePoolLookupByName,
to
.listPools = vboxStorageListPools,
.poolLookupByName = vboxStoragePoolLookupByName,
Fix some driver names:
s/virDrvCPUCompare/virDrvCompareCPU/
s/virDrvCPUBaseline/virDrvBaselineCPU/
s/virDrvQemuDomainMonitorCommand/virDrvDomainQemuMonitorCommand/
s/virDrvSecretNumOfSecrets/virDrvNumOfSecrets/
s/virDrvSecretListSecrets/virDrvListSecrets/
And some driver struct field names:
s/getFreeMemory/nodeGetFreeMemory/
Only in drivers which use virDomainObj, drivers that query hypervisor
for domain status need to be updated separately in case their hypervisor
supports this functionality.
The reason is also saved into domain state XML so if a domain is not
running (i.e., no state XML exists) the reason will be lost by libvirtd
restart. I think this is an acceptable limitation.
This is needed if we want to transfer a temporary file. If the
transfer is done with iohelper, we might run into a race condition,
where we unlink() file before iohelper is executed.
* src/fdstream.c, src/fdstream.h,
src/util/iohelper.c: Add new option
* src/lxc/lxc_driver.c, src/qemu/qemu_driver.c,
src/storage/storage_driver.c, src/uml/uml_driver.c,
src/xen/xen_driver.c: Expand existing function calls
These VIR_XXXX0 APIs make us confused, use the non-0-suffix APIs instead.
How do these coversions works? The magic is using the gcc extension of ##.
When __VA_ARGS__ is empty, "##" will swallow the "," in "fmt," to
avoid compile error.
example: origin after CPP
high_level_api("%d", a_int) low_level_api("%d", a_int)
high_level_api("a string") low_level_api("a string")
About 400 conversions.
8 special conversions:
VIR_XXXX0("") -> VIR_XXXX("msg") (avoid empty format) 2 conversions
VIR_XXXX0(string_literal_with_%) -> VIR_XXXX(%->%%) 0 conversions
VIR_XXXX0(non_string_literal) -> VIR_XXXX("%s", non_string_literal)
(for security) 6 conversions
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This matches the public API and helps to get rid of some special
case code in the remote generator.
Rename driver API functions and XDR protocol structs.
No functional change included outside of the remote generator.
Clang noticed a dead assignment, which turned out to be the use
of the wrong variable. rc starts life as -1, and is only ever
assigned to 0 just before a successful cleanup.
* src/lxc/lxc_driver.c (lxcSetupInterfaces): Don't call
virReportSystemError(-1).
This reverts commit 0e7f7f8566.
From the mailing list:
> So, AFAICT, this patch means we will never reconnect to any LXC
> VMs now.
>
> The correct solution, is to refactor LXC driver startup to work
> the same way as the QEMU driver startup.
>
> - Load all the live state XML files (to pick up running VMs)
> - Reconnect to all VMs
> - Load all the persistent config XML files (to pick up any additional
> inactive guets)
But that solution is invasive enough to be post-0.9.1.
The O_NONBLOCK flag doesn't work as desired on plain files
or block devices. Introduce an I/O helper program that does
the blocking I/O operations, communicating over a pipe that
can support O_NONBLOCK
* src/fdstream.c, src/fdstream.h: Add non-blocking I/O
on plain files/block devices
* src/Makefile.am, src/util/iohelper.c: I/O helper program
* src/qemu/qemu_driver.c, src/lxc/lxc_driver.c,
src/uml/uml_driver.c, src/xen/xen_driver.c: Update for
streams API change
THe veth setup in LXC had a couple of flaws, first brInit did
not report any error when it failed. Second vethCreate() did
not correctly initialize the variable containing the return
code, so could report failure even when it succeeded.
* src/lxc/lxc_driver.c: Report error when brInit fails
* src/lxc/veth.c: Fix uninitialized variable
It is possible to set a migration speed limit when starting
migration. This new API allows the speed limit to be changed
on the fly to adjust to changing conditions
* src/driver.h, src/libvirt.c, src/libvirt_public.syms,
include/libvirt/libvirt.h.in: Add virDomainMigrateSetMaxSpeed
* src/esx/esx_driver.c, src/lxc/lxc_driver.c,
src/opennebula/one_driver.c, src/openvz/openvz_driver.c,
src/phyp/phyp_driver.c, src/qemu/qemu_driver.c,
src/remote/remote_driver.c, src/test/test_driver.c,
src/uml/uml_driver.c, src/vbox/vbox_tmpl.c,
src/vmware/vmware_driver.c, src/xen/xen_driver.c,
src/libxl/libxl_driver.c: Stub new API
* Correct the documentation for cgroup: the swap_hard_limit indicates
mem+swap_hard_limit.
* Change cgroup private apis to: virCgroupGet/SetMemSwapHardLimit
Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
The current LXC I/O controller looks for HUP to detect
when a guest has quit. This isn't reliable as during
initial bootup it is possible that 'init' will close
the console and let mingetty re-open it. The shutdown
of containers was also flakey because it only killed
the libvirt I/O controller and expected container
processes to gracefully follow.
Change the I/O controller such that when it see HUP
or an I/O error, it uses kill($PID, 0) to see if the
process has really quit.
Change the container shutdown sequence to use the
virCgroupKillPainfully function to ensure every
really goes away
This change makes the use of the 'cpu', 'devices'
and 'memory' cgroups controllers compulsory with
LXC
* docs/drvlxc.html.in: Document that certain cgroups
controllers are now mandatory
* src/lxc/lxc_controller.c: Check if PID is still
alive before quitting on I/O error/HUP
* src/lxc/lxc_driver.c: Use virCgroupKillPainfully
This patch introduces a new libvirt API (virDomainSetMemoryFlags) and
a flag (virDomainMemoryModFlags).
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Adding audit points showed that we were granting too much privilege
to qemu; it should not need any mknod rights to recreate any
devices. On the other hand, lxc should have all device privileges.
The solution is adding a flag parameter.
This also lets us restrict write access to read-only disks.
* src/util/cgroup.h (virCgroup*Device*): Adjust prototypes.
* src/util/cgroup.c (virCgroupAllowDevice)
(virCgroupAllowDeviceMajor, virCgroupAllowDevicePath)
(virCgroupDenyDevice, virCgroupDenyDeviceMajor)
(virCgroupDenyDevicePath): Add parameter.
* src/qemu/qemu_driver.c (qemudDomainSaveFlag): Update clients.
* src/lxc/lxc_controller.c (lxcSetContainerResources): Likewise.
* src/qemu/qemu_cgroup.c: Likewise.
(qemuSetupDiskPathAllow): Also, honor read-only disks.
virRun gives pretty useful error output, let's not overwrite it unless there
is a good reason. Some places were providing more information about what
the commands were _attempting_ to do, however that's usually less useful from
a debugging POV than what actually happened.
Relax the restriction that the hash table key must be a string
by allowing an arbitrary hash code generator + comparison func
to be provided
* util/hash.c, util/hash.h: Allow any pointer as a key
* internal.h: Include stdbool.h as standard.
* conf/domain_conf.c, conf/domain_conf.c,
conf/nwfilter_params.c, nwfilter/nwfilter_gentech_driver.c,
nwfilter/nwfilter_gentech_driver.h, nwfilter/nwfilter_learnipaddr.c,
qemu/qemu_command.c, qemu/qemu_driver.c,
qemu/qemu_process.c, uml/uml_driver.c,
xen/xm_internal.c: s/char */void */ in hash callbacks
Using the 'personality(2)' system call, we can make a container
on an x86_64 host appear to be i686. Likewise for most other
Linux 64bit arches.
* src/lxc/lxc_conf.c: Fill in 32bit capabilities for x86_64 hosts
* src/lxc/lxc_container.h, src/lxc/lxc_container.c: Add API to
check if an arch has a 32bit alternative
* src/lxc/lxc_controller.c: Set the process personality when
starting guest
When spawning 'init' in the container, set
LIBVIRT_LXC_UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
LIBVIRT_LXC_NAME=YYYYYYYYYYYY
to allow guest software to detect & identify that they
are in a container
* src/lxc/lxc_container.c: Set LIBVIRT_LXC_UUID and
LIBVIRT_LXC_NAME env vars
Normal practice for /dev/pts is to have it mode=620,gid=5
but LXC was leaving mode=000,gid=0 preventing unprivilegd
users in the guest use of PTYs
* src/lxc/lxc_controller.c: Fix /dev/pts setup
Done mechanically with:
$ git grep -l '\bDEBUG0\? *(' | xargs -L1 sed -i 's/\bDEBUG0\? *(/VIR_&/'
followed by manual deletion of qemudDebug in daemon/libvirtd.c, along
with a single 'make syntax-check' fallout in the same file, and the
actual deletion in src/util/logging.h.
* src/util/logging.h (DEBUG, DEBUG0): Delete.
* daemon/libvirtd.h (qemudDebug): Likewise.
* global: Change remaining clients over to VIR_DEBUG counterpart.
Until now, user namespaces have not done much, but (for that
reason) have been innocuous to glob in with other CLONE_
flags. Upcoming userns development, however, will make tasks
cloned with CLONE_NEWUSER far more restricted. In particular,
for some time they will be unable to access files with anything
other than the world access perms.
This patch assumes that noone really needs the user namespaces
to be enabled. If that is wrong, then we can try a more
baroque patch where we create a file owned by a test userid with
700 perms and, if we can't access it after setuid'ing to that
userid, then return 0. Otherwise, assume we are using an
older, 'harmless' user namespace implementation.
Comments appreciated. Is it ok to do this?
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
This will allow us to record transient runtime state in vm->def, like
default VNC parameters. Accomplish this by adding an extra 'live' parameter
to SetDefTransient, with similar semantics to the 'live' flag for
AssignDef.
Display or set unlimited values for memory parameters. Unlimited is
represented by INT64_MAX in memory cgroup.
Signed-off-by: Nikunj A. Dadhania <nikunj@linux.vnet.ibm.com>
Reported-by: Justin Clift <jclift@redhat.com>
Except LXC and UML driver, implementations of all other drivers
simply return 0, because these drivers doesn't have config both
in memory and on disk, no need to track if the domain of these
drivers updated or not.
Rename "xenUnifiedDomainisPersistent" to "xenUnifiedDomainIsPersistent"
* esx/esx_driver.c
* lxc/lxc_driver.c
* opennebula/one_driver.c
* openvz/openvz_driver.c
* phyp/phyp_driver.c
* test/test_driver.c
* uml/uml_driver.c
* vbox/vbox_tmpl.c
* xen/xen_driver.c
* xenapi/xenapi_driver.c
