Add the function virHostdevIsMdevDevice() which detects whether a
hostdev is a mediated device or not. Also, replace all existing
conditionals.
Signed-off-by: Shalini Chellathurai Saroja <shalini@linux.vnet.ibm.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Commit b4c2ac8d56 made a false assumption that IOMMU support necessary
for an mdev device to be assigned to a VM. Unlike direct PCI assignment,
IOMMU support is not needed for mediated devices, as the physical parent
device provides the isolation, therefore, simply checking for VFIO
presence is enough to successfully start a VM.
Luckily, this issue is not serious, since as of yet, libvirt mandates
mdevs to be pre-created prior to a domain's launch - if it is,
everything does work smoothly even with IOMMU disabled, because the
parent device will ensure the iommu groups we try to access exist.
However, if there are *no* IOMMU groups yet, thus no mdev exists yet, one
would see the following error:
"unsupported configuration: Mediated host device assignment requires VFIO
support"
The error msg above is simply wrong and doesn't even reflect the IOMMU
reality, so after applying this patch one would rather see the following
error in such case instead:
"device not found: mediated device '<UUID>' not found"
Signed-off-by: Erik Skultety <eskultet@redhat.com>
Commit a4a39d90 added a check that checks for VFIO support with mediated
devices. The problem is that the hostdev preparing functions behave like
a fallthrough if device of that specific type doesn't exist. However,
the check for VFIO support was independent of the existence of a mdev
device which caused the guest to fail to start with any device to be
directly assigned if VFIO was disabled/unavailable in the kernel.
The proposed change first ensures that it makes sense to check for VFIO
support in the first place, and only then performs the VFIO support check
itself.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1441291
Signed-off-by: Erik Skultety <eskultet@redhat.com>
Keep track of the assigned mediated devices the same way we do it for
the rest of hostdevs. Methods like 'Prepare', 'Update', and 'ReAttach'
are introduced by this patch.
Signed-off-by: Erik Skultety <eskultet@redhat.com>
Open /dev/vhost-scsi, and record the resulting file descriptor, so that
the guest has access to the host device outside of the libvirt daemon.
Pass this information, along with data parsed from the XML file, to build
a device string for the qemu command line. That device string will be
for either a vhost-scsi-ccw device in the case of an s390 machine, or
vhost-scsi-pci for any others.
Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
The directories we iterate over are unlikely to contain any entries
starting with a dot, other than '.' and '..' which is already skipped
by virDirRead.
This calls the PCI-, USB- and SCSI-specific functions just
like qemuHostdev{Prepare,ReAttach}DomainDevices() already do,
and was the missing piece for the qemuHostdev API to nicely
mirror the virHostdev API.
Update qemuProcessReconnect() to use the new function.
Adopt the same names used for virHostdevUpdateActive*Devices() for
consistency's sake and to make it easier to jump between the two.
No functional changes.
Adopt the same names used for virHostdevReAttach*Devices() for
consistency's sake and to make it easier to jump between the two.
No functional changes.
Convert all remaining clients of readdir to use the new
interface, so that we can ensure (unlikely) errors while
reading a directory are reported.
* src/openvz/openvz_conf.c (openvzAssignUUIDs): Use new
interface.
* src/parallels/parallels_storage.c (parallelsFindVolumes)
(parallelsFindVmVolumes): Report readdir failures.
* src/qemu/qemu_driver.c (qemuDomainSnapshotLoad): Ignore readdir
failures.
* src/secret/secret_driver.c (loadSecrets): Likewise.
* src/qemu/qemu_hostdev.c
(qemuHostdevHostSupportsPassthroughVFIO): Report readdir failures.
* src/xen/xen_inotify.c (xenInotifyOpen): Likewise.
* src/xen/xm_internal.c (xenXMConfigCacheRefresh): Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
Since it is an abbreviation, PCI should always be fully
capitalized or full lower case, never Pci.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Any source file which calls the logging APIs now needs
to have a VIR_LOG_INIT("source.name") declaration at
the start of the file. This provides a static variable
of the virLogSource type.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Changes parameter from vm def to specific hostdevs info and name info, so that
it could be used more widely, e.g, could be used without full vm def info.
Some virHostdevXXXX methods included the string Hostdev again
as a suffix. Change the latter to Device instead.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Change any method names with Usb, Pci or Scsi to use
USB, PCI and SCSI since they are abbreviations.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Various methods in virnetdev.c and virhostdev.c were missing
const-ness for several char * parameters.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
