If qemu-pr-helper is compiled with multipath support the first
thing it does is open /dev/mapper/control. Since we're going
to be running it inside qemu namespace we need to create it
there. Unfortunately, we don't know if it was compiled with or
without multipath so we have to create it anyway.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
For command line we need two things:
1) -object pr-manager-helper,id=$alias,path=$socketPath
2) -drive file.pr-manager=$alias
In -object pr-manager-helper we tell qemu which socket to connect
to, then in -drive file-pr-manager we just reference the object
the drive in question should use.
For managed PR helper the alias is always "pr-helper0" and socket
path "${vm->priv->libDir}/pr-helper0.sock".
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The capability tracks if qemu has pr-manager-helper object. At
this time don't actually detect if qemu has the capability. Not
just yet. Only after the code is written the feature will be
enabled.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Couple of reasons for that:
a) there's no monitor command to change path where the pr-helper
connects to, or
b) there's no monitor command to introduce a new pr-helper for a
disk that already exists.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This is a definition that holds information on SCSI persistent
reservation settings. The XML part looks like this:
<reservations enabled='yes' managed='no'>
<source type='unix' path='/path/to/qemu-pr-helper.sock' mode='client'/>
</reservations>
If @managed is set to 'yes' then the <source/> is not parsed.
This design was agreed on here:
https://www.redhat.com/archives/libvir-list/2017-November/msg01005.html
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Rather than have virJSONValueArraySize return a -1 when the input
is not an array and then splat an error message, let's check for
an array before calling and then change the return to be a size_t
instead of ssize_t.
That means using the helper virJSONValueIsArray as well as using a
more generic error message such as "Malformed <something> array".
In some cases we can remove stack variables and when we cannot,
those variables should be size_t not ssize_t. Alter a few references
of if (!value) to be if (value == 0) instead as well.
Some callers can already assume an array is being worked on based
on the previous call, so there's less to do.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
The pointer to the qemu driver is already included in domain object's
private data, so does not need to be passed as yet another parameter
when the domain object is already passed.
Also removes parameter 'driver' from functions which had it just because of
qemuBlockJobUpdate.
Signed-off-by: Roland Schulz <schullzroll@gmail.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Use the new helper when checking that the VM needs to be tainted as a
host-cdrom passthrough.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Laine Stump <laine@laine.org>
The function will be reused in the test code where we don't care much
that the gluster debug level can't be populated from the qemu config.
Set the level only when 'cfg' is passed.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
When using blockdev-add and friends, libvirt will need to create also
properties for the qcow2/raw/... format handler in qemu. This patch adds
the infrastructure and implements all formats known to libvirt including
all properties which are expressed at the format level in qemu.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Enabling discard for the storage node allows the format drivers to
discard snapshots and other things, while configuration of the format
layer actually decides whether to actually discard data on request from
the host.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This will be required when doing blockdev-add to conform with the
approach qemu choses to create the disks.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
When used directly with blockdev-add/-blockdev the cache mode will need
to be specified directly for every image rather than just for the disk
itself. This implements the backing options 'direct' and 'no-flush'.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
qemu declares node-name as a 32 byte buffer and silently truncates
anything longer than that. This is unacceptable for libvirt, so we need
to make sure that we won't ever supply a node-name exceeding 31 chars.
Add a function which will do the validation and use it to validate
storage-protocol node names.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The gluster protocol in qemu uses two styles, one of which is legacy and
not covered by the QAPI schema.
To allow using of the new style in the blockdev-add code, add a
parameter for qemuBlockStorageSourceGetBackendProps which will switch
between the two modes.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Block storage should actually be passed to qemu via 'host_device' or
'host_cdrom' according to the device type. There were no users of this
behaviour so we thankfully can change it.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Use virFileIsCDROM to detect whether a block device is a cdrom drive and
store it in virStorageSource. This will be necessary to correctly create
the 'host_cdrom' backend in qemu when using -blockdev.
We assume that host_cdrom makes only sense when used directly as a raw
image, but if a backing chain would be put in front of it, libvirt will
use 'host_device' in that case.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Add detection mechanism which will allow to check whether a path to a
block device is a physical CDROM drive. This will be useful once we will
need to pass it to hypervisors.
The linux implementation uses an ioctl to do the detection, while the
fallback uses a simple string prefix match.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Handle VIR_STORAGE_TYPE_DIR in qemuBlockStorageSourceGetBackendProps so
that a 'vvfat' driver is used, which emulates a FAT filesystem
containing the folders.
qemu requires us to add it as a storage layer, since a 'raw' layer is
usually put on top of it.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Move it to the validation callback and make it more robust. This will
also put the checks in the correct place to use with -blockdev.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Add a flag denoting that a virStorageSource is going to be used as a
floppy image. This will be useful in cases where the user passes in
files which shall be exposed as an image to the guest.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
'file' backend in qemu supports few more options than the current
implementation. Extract it so that changes don't pollute the code.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Some properties don't make sense to be configured for every single layer
of the backing chain, but to avoid needing to pass the disk structure we
will copy them to the individual virStorageSource.
Zero detection is applied only for the top layer image, while caching
and iomode for all layers.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Few things which are currently stored the virDomainDiskDef structure are
actually relevant for the storage source as well. Add the fields with a
note that they are just mirror of the values from the disk.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Save and restore node names if we know them or when we will be
generating them in the status XML.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Everything besides the top of the chain is readonly. Track this when
parsing the XML and detecting the chain from the disk. Also fix the
state when taking snapshots.
All other cases where the top image is changed already preserve the
readonly state from the original image.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This capability is unused since we stopped parsing -help output.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The -no-kvm-pit-reinjection option has been deprecated since
its introduction in QEMU 1.3. See commit <1569fa1>.
Drop the capability since all the QEMUs we support allow tuning
the kvm-pit properties via -global.
Also add the QEMU_CAPS_KVM_PIT_TICK_POLICY to the clock-catchup
tests, since expecting it to succeed with QEMU that does not
have kvm-pit makes no sense.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Since we started assuming QEMU_CAPS_MACHINE_OPT in
commit <69420756>, this function can only be reached
for unsupported virt types.
Replace the call with a virReportError.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
We have been checking whether qemu-img supports the -o compat
option by scraping the -help output.
Since we require QEMU 1.5.0 now and this option was introduced in 1.1,
assume we support it and ditch the help parsing code along with the
extra qemu-img invocation.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
When adding a new object to the domain object list, there should
have been 2 virObjectRef calls made one for each list into which
the object was placed to match the 2 virObjectUnref calls that
would occur during Remove as part of virHashRemoveEntry when
virObjectFreeHashData is called when the element is removed from
the hash table as set up in virDomainObjListNew.
Some drivers (libxl, lxc, qemu, and vz) handled this inconsistency
by calling virObjectRef upon successful return from virDomainObjListAdd
in order to use virDomainObjEndAPI when done with the returned @vm.
While others (bhyve, openvz, test, and vmware) handled this via only
calling virObjectUnlock upon successful return from virDomainObjListAdd.
This patch will "unify" the approach to use virDomainObjEndAPI
for any @vm successfully returned from virDomainObjListAdd.
Because list removal is so tightly coupled with list addition,
this patch fixes the list removal algorithm to return the object
as entered - "locked and reffed". This way, the callers can then
decide how to uniformly handle add/remove success and failure.
This removes the onus on the caller to "specially handle" the
@vm during removal processing.
The Add/Remove logic allows for some logic simplification such
as in libxl where we can Remove the @vm directly rather than
needing to set a @remove_dom boolean and removing after the
libxlDomainObjEndJob completes as the @vm is locked/reffed.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Since the @dconn reference via args->conn will be used via a thread
or callback, let's make sure memory associated with it isn't free'd
unexpectedly before we use it. The Unref will be done when the object
is Dispose'd.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
When adding the @vm to the @args for usage during a thread or
callback, let's add the reference to it at the time of adding to
ensure nothing else deletes it. The corresponding Unref is then
added to the Dispose function.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Rather than open code within virDomainObjListRemove, just call
the *Locked function.
Additionally, add comments to virDomainObjListRemove to describe
the usage model.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Use the FindBy{UUID|Name}Locked helpers which will return a locked
and ref counted object rather than the direct virHashLookup and
virObjectLock of the returned object. We'll need to temporarily
virObjectUnref when we assign a new domain @def, but that will
change shortly when virDomainObjListAddObjLocked returns the
correct reference counted object.
Use the virDomainObjEndAPI in the error path to Unref/Unlock for
the corresponding Unref/Unlock of either the FindBy* return or
the virDomainObjNew since both return a reffed/locked object.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Create helpers virDomainObjListFindByUUIDLocked and
virDomainObjListFindByNameLocked to avoid the need
to lock the domain object list leaving that task
for the caller.
Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
This is the old style and we really shouldn't be adding any more
examples like this. Add a comment to warn devs away
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Cole Robinson <crobinso@redhat.com>
<features><vmcoreinfo/> is a bare boolean XML property. We don't really
use this format anymore and instead prefer tristate <X state=on|off/>
since it's required for modeling on/off/default. If for example future
qemu started enabling vmcoreinfo by default we wouldn't have any way
for the user to turn this off.
Convert it to tristate. For writing XML this is semanticly the same,
<vmcoreinfo/> is processed as <vmcoreinfo state='on'/>.
For apps reading guest XML this is technically an API change,
as they might misinterpret <vmcoreinfo state='off'/>, however this
has only been present in libvirt since 3.10.0 and I don't think any
apps are dependent on this yet
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Cole Robinson <crobinso@redhat.com>
We want to make sure our wrapper is used instead in order
to keep the test suite working.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The latter is impossible to mock on platforms that use the
gnulib implementation, such as FreeBSD, while the former
doesn't suffer from this limitation.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
It's a trivial wrapper around canonicalize_file_name(),
which we need in order to fully mock file access on non-Linux
platforms.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The vm name is not needed for any functional requirement, but it will be
useful when debugging problems to identify which VM is associated with a
filter, since UUID is not human friendly.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virDomainNet struct contains everything related to configuring a
guest network device. Out of all of this info, only 5 fields are
relevant to configuring network filters. It will be more convenient for
future changes to the nwfilter driver if the relevant fields are kept in
a dedicated struct. Thus the virNWFilterBinding struct is created to
track this information.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The filter parameters were not correctly free'd when an error hits while
adding to the hash table.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
There is a bunch of left over code in the nwfilter driver related to
monitoring firewalld over dbus, that is no longer used since the
conversion to use virFirewall APIs.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virNWFilterIPAddrLearnReq type should only be used by the IP address
learning code, so can live in the implementation file instead of header
file.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Various methods return a virNWFilterIPAddrLearnReq struct, but the
callers are only interested in whether the return value is non-NULL.
It is thus preferrable to just return a bool.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
All the code now just uses the virHashTablePtr type directly.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This removes the virNWFilterHashTableFree, virNWFilterHashTablePut
and virNWFilterHashTableRemove methods, in favour of just calling
the virHash APIs directly.
The virNWFilterHashTablePut method was unreasonably complex because
the virHashUpdateEntry already knows how to create the entry if it
does not currently exist.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virNWFilterHashTable struct only contains a single virHashTable
member since
commit 293d4fe2f1
Author: Daniel P. Berrange <berrange@redhat.com>
Date: Mon Mar 24 16:35:23 2014 +0000
Remove pointless storage of var names in virNWFilterHashTable
Thus, this struct wrapper adds no real value over just using the
virHashTable directly, but brings the complexity of needing to derefence
the hashtable to call virHash* APIs, and adds extra memory allocation
step.
To minimize code churn this just turns virNWFilterHashTable into a
typedef aliases virHashTable.
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Alter qemuBuildTPMDevStr to format the tpm-crb on the command line
and use the enum range checking for valid model.
Add a test case for the formation of the tpm-crb QEMU device
command line. The qemuxml2argvtest changes cannot use the newer
DO_TEST_CAPS_LATEST since building of the command line involves
calling qemuBuildTPMBackendStr which attempts to open the
path to the device (e.g. /dev/tmp0).
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
QEMU on x86_64 (since v2.12) can support tpm-crb devices.
Introduce qemu capabilities for this device.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Enable the TPM CRB to be specified in the domain XML. This
now allows to describe the TPM device like this:
<tpm model='tpm-crb'>
<backend type='passthrough'>
<device path='/dev/tpm0'/>
</backend>
</tpm>
Extend the XML schema to also allow tpm-crb.
Extend the documentation.
Add a test case for testing the XML parser and formatter.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
As QEMU driver, test driver does not accept slashes inside domain names.
This commit fixes this problem checking slashes inside the new name when
'domrename' is executed.
Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The 'domrename' command needs to check if the new domain name contains
the slash character. This character is not accepted by libvirt XML
definition because it is an invalid char (see Cole's commit b1fc6a7b7).
This commit enhace the 'domrename' command adding this check.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1333232
Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The virStorageFileLoadBackendModule method is only used if either
fs or gluster storage is built in, which doesn't happen on mingw
leading to warning of an unused static function.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The storage file drivers are currently loaded as a side effect of
loading the storage driver. This is a bogus dependancy because the
storage file code has no interaction with the storage drivers, and
even ultimately be running in a completely separate daemon.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virStorageFileSupportsSecurityDriver and
virStorageFileSupportsAccess currently just return a boolean
value. This is ok because they don't have any failure scenarios
but a subsequent patch is going to introduce potential failure
scenario. This changes their return type from a boolean to an
int with values -1, 0, 1.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The virStorageFileGetBackingStoreStr method has overloaded the NULL
return value to indicate both no backing available and a fatal
error dealing with it.
The caller is thus not able to correctly propagate the error
messages.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The storage file code needs to be run in the hypervisor drivers, while
the storage backend code needs to be run in the storage driver. Split
the source code as a preparatory step for creating separate loadable
modules.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The storage file code needs to be run in the hypervisor drivers, while
the storage backend code needs to be run in the storage driver. Split
the source code as a preparatory step for creating separate loadable
modules.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The driver.{c,h} files are primarily targetted at loading hypervisor
drivers and some helper functions in that area. It also, however,
contains a generically useful function for loading extension modules
that is called by the storage driver. Split that functionality off
into a new virmodule.{c,h} file to isolate it.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Use the TLS env for migration when starting the NBD server if TLS is
enabled for migration.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
To allow encryption of the non-shared storage migration NBD connection
we will need to instantiated the NBD server with the TLS env.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The NBD server in qemu supports TLS transport. Detect this capability.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
When a VM is destroyed while being migrated (waiting in
qemuMigrationSrcWaitForCompletion) the private object cleanup code frees
the 'current' job info. Since the migration code attempts to setup
various aspects of the current job even on failure this results into a
crash.
Job data is cleared in qemuDomainObjPrivateDataClear since commit
888aa4b6b9
Fix this by skipping all of the code which requires the qemu process to
be alive if the VM is not active any more.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
Since libvirt is currently not able to setup the NBD migration stream
secured by TLS we should not allow such migration since data would be
transferred unencrypted.
This will break compatibility of TLS migration if non-shared storage is
requested but the security implications are more severe.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
When an nwfilter rule sets the parameter CTRL_IP_LEARNING to "dhcp",
this turns on the "dhcpsnoop" thread, which uses libpcap to monitor
traffic on the domain's tap device and extract the IP address from the
DHCP response.
If libpcap on the host is built with HAVE_TPACKET3 defined (to enable
support for TPACKET_V3), the dhcpsnoop code's initialization of the
libpcap socket would fail with the following error:
virNWFilterSnoopDHCPOpen:1134 : internal error: pcap_setfilter: can't remove kernel filter: Bad file descriptor
It turns out that this was because TPACKET_V3 requires a larger buffer
size than libvirt was setting (we were setting it to 128k). Changing
the buffer size to 256k eliminates the error, and the dhcpsnoop thread
once again works properly.
A fuller explanation of why TPACKET_V3 requires such a large buffer,
for future git spelunkers:
libpcap calls setsockopt(... SOL_PACKET, PACKET_RX_RING...) to setup a
ring buffer for receiving packets; two of the attributes sent to this
API are called tp_frame_size, and tp_frame_nr. If libpcap was built
with HAVE_TPACKET3 defined, tp_trame_size is set to MAXIMUM_SNAPLEN
(defined in libpcap sources as 262144) and tp_frame_nr is set to:
[the buffer size we set, i.e. PCAP_BUFFERSIZE i.e. 262144] / tp_frame_size.
So if PCAP_BUFFERSIZE < MAXIMUM_SNAPLEN, then tp_frame_nr (the number
of frames in the ring buffer) is 0, which is nonsensical. This same
value is later used as a multiplier to determine the size for a call
to malloc() (which would also fail).
(NB: if HAVE_TPACKET3 is *not* defined, then tp_frame_size is set to
the snaplen set by the user (in our case 576) plus a small amount to
account for ethernet headers, so 256k is far more than adequate)
Since the TPACKET_V3 code in libpcap actually reads multiple packets
into each frame, it's not a problem to have only a single frame
(especially when we are monitoring such infrequent traffic), so it's
okay to set this relatively small buffer size (in comparison to the
default, which is 2MB), which is important since every guest using
dhcp snooping in a nwfilter rule will hold 2 of these buffers for the
entire life of the guest.
Thanks to Christian Ehrhardt for discovering that buffer size was the
problem (this was not at all obvious from the error that was logged!)
Resolves: https://bugzilla.redhat.com/1547237
Fixes: https://bugs.launchpad.net/libvirt/+bug/1758037
Signed-off-by: Laine Stump <laine@laine.org>
Reviewed-by: Christian Ehrhardt <christian.ehrhardt@canonical.com> (V1)
Reviewed-by: John Ferlan <jferlan@redhat.com>
Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
This reverts commit 8daa593b07.
There are two undesirable aspects to the impl
- Only a bare wildcard is permitted
- The wildcard match is not performed in the order listed
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The code setting TLS parameters verifies that TLS is supported by
looking at the dump of parameters which will be reset after migration,
but sets the parameters in the list of new parameters. As
qemuMigrationParamsSetString did not set the 'set' property, the TLS
parameters would not be used.
This is a regression after the series refactoring migration parameters
and it resulted into TLS not being used even when requested.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
