Split the convoluted driver loader function into simpler parts which
will potentially allow reuse.

The niothreadids struct field is size_t, so must use %zu not %lu
with printf. While they're identical on some platforms, on others
they are different, causing warnings

conf/domain_conf.c: In function 'virDomainDefCheckABIStabilityFlags':
conf/domain_conf.c:19575:26: error: format '%lu' expects argument of type 'long unsigned int', but argument 7 has type 'size_t {aka unsigned int}' [-Werror=format=]
                        _("Target domain iothreads count %lu does not "
                          ^

conf/domain_conf.c: In function 'virDomainDefFormatInternal':
conf/domain_conf.c:23915:46: error: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t {aka unsigned int}' [-Werror=format=]
         virBufferAsprintf(buf, "<iothreads>%lu</iothreads>\n",
                                              ^
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

This follows the same check for disk, because we cannot remove iothread
if it's used by disk or by controller.  It could lead to crashing QEMU.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

If virDomainDelIOThread API was called with VIR_DOMAIN_AFFECT_LIVE
and VIR_DOMAIN_AFFECT_CONFIG and both XML were already a different
it could result in removing iothread from config XML even if there
was a disk using that iothread.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

This will ensure that IOThreads are properly validated while
a domain is defined.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

The situation covered by the removed code will not ever happen.
This code is called only while starting a new QEMU process where
the capabilities where already checked and while attaching to
existing QEMU process where we don't even detect the iothreads.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

The utils code should stay separated from other code (except for very
well justified cases). Unfortunately commit 272769be
made it trivial to break the separation (and not get slapped by the
syntax-check rule) by adding -I src/conf to the CFLAGS for utils.

Remove this shortcut and except the two offenders from the syntax check
so that the codebase can be kept separated.

The comment was actually wrong as
https://www.freedesktop.org/software/systemd/man/udev_new.html#
mentions that on failure NULL is returned.  Also the same return value
is checked in src/interface/interface_backend_udev.c already.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>

When enabling virgl, qemu opens /dev/dri/render*. So far, we are
not allowing that in devices CGroup nor creating the file in
domain's namespace and thus requiring users to set the paths in
qemu.conf. This, however, is suboptimal as it allows access to
ALL qemu processes even those which don't have virgl configured.
Now that we have a way to specify render node that qemu will use
we can be more cautious and enable just that.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

So far, qemuDomainGetHostdevPath has no knowledge of the reasong
it is called and thus reports /dev/vfio/vfio for every VFIO
backed device. This is suboptimal, as we want it to:

a) report /dev/vfio/vfio on every addition or domain startup
b) report /dev/vfio/vfio only on last VFIO device being unplugged

If a domain is being stopped then namespace and CGroup die with
it so no need to worry about that. I mean, even when a domain
that's exiting has more than one VFIO devices assigned to it,
this function does not clean /dev/vfio/vfio in CGroup nor in the
namespace. But that doesn't matter.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

So far, we are allowing /dev/vfio/vfio in the devices cgroup
unconditionally (and creating it in the namespace too). Even if
domain has no hostdev assignment configured. This is potential
security hole. Therefore, when starting the domain (or
hotplugging a hostdev) create & allow /dev/vfio/vfio too (if
needed).
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

Since these two functions are nearly identical (with
qemuSetupHostdevCgroup actually calling virCgroupAllowDevicePath)
we can have one function call the other and thus de-duplicate
some code.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

There's no need for this function. Currently it is passed as a
callback to virSCSIVHostDeviceFileIterate(). However, SCSI host
devices have just one file path. Therefore we can mimic approach
used in qemuDomainGetHostdevPath() to get path and call
virCgroupAllowDevicePath() directly.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

There's no need for this function. Currently it is passed as a
callback to virSCSIDeviceFileIterate(). However, SCSI devices
have just one file path. Therefore we can mimic approach used in
qemuDomainGetHostdevPath() to get path and call
virCgroupAllowDevicePath() directly.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

There's no need for this function. Currently it is passed as a
callback to virUSBDeviceFileIterate(). However, USB devices have
just one file path. Therefore we can mimic approach used in
qemuDomainGetHostdevPath() to get path and call
virCgroupAllowDevicePath() directly.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

Add a test that allows providing the parent fabric_wwn in the input XML
in order to create the vHBA.

This also fixes a mixed setting of the fabric_wwn field from the read
test driver XML strings.

Rework the code to perform the various searches by parent, parent_wwnn/
parent_wwpn, parent_fabric_wwn, or vport capable in order to return the
'parent_host' number that is vHBA capable.

The former virNodeDeviceGetParentHost is renamed to add the ByParent
on it fixes an issue where if no parent was supplied in the XML to
create the vHBA, then virNodeDeviceFindByName was called with a NULL
second parameter which had bad results.

The reworked code will make the various calls to fetch the NPIV host
by the passed parameter options or if none are provided find a vport
capable NPIV HBA to perform the create. If the call is from the delete
path, then this option won't be allowed.

Each of virNodeDeviceGetParentHostBy* functions is now static, so
remove them external definitions.

A secondary benefit of this is the test_driver now can make use of
the new API to add some new tests to test the various creation options.

While perhaps improbable, it could be possible that after finding our
object that another thread running essentially in parallel could attempt
to delete the same vHBA.

So rather than dropping the lock right after finding the object, keep
the lock around while we drop the object lock and work on deleting the
object. Once the delete occurs we can safely drop the driver lock again.

Cleanup some of the usage of cleanup instead out for the goto label.

Create a virscsihost.c and place the functions there. That removes the
last #ifdef __linux__ from virutil.c.

Take the opporunity to also change the function names and in one case
the parameters slightly

Use the new virNodeDeviceGetParentName instead. Modify the callers to
build the node device scsi_host# name string in order to call the new
function so that proper lookup occurs.

Create a function which takes a node device "name" entry to lookup
and returns a string containing the parent name for the node device.

Rather than have them mixed in with the virutil apis, create a separate
virvhba.c module and move the vHBA related calls into there. Soon there
will be more added.

Also modify the names of the functions and some arguments to be more
indicative of what is really happening. Adjust the callers respectively.

While I was changing fchosttest, rather than the non-descriptive names
test1...test6, rename them to match what the test is doing.

Modify the code to react more like a real HBA -> vHBA creation.

Currently the code would just modify the input XML definition to
set the name to a wwpn and then modify the scsi_host capability
entry for the defintion to change the scsi_host# and unique_id
before adding that into the node device.

This patch does things a bit better. It finds and copies a known
existing vHBA (scsi_host11) in the node_device database and modifies
that definition to change the name to scsi_host12 and set the wwnn/
wwpn to what the input XML would expect before adding the def to the
node device object list.

Then rather than create a returned "dev" using the (poorly) mocked
name - perform the lookup using the new device name.

Rather than inline the dummy creation of a vHBA to add to the node
devices - create a helper to do that work.

Also just tidy up a couple of things while at it...

Predefine a second NPIV capable HBA as well as a vHBA using the first
NPIV capable HBA. This will allow for a mechanism to perform more
realistic create vHBA testing.

Alter "test-scsi-host-vport" to be "scsi_host1" to match the real
environment. This is the vport capable HBA - IOW the NPIV device.
Add more fields to scsi_host1 as well.

Alter the XML being used by the objecttest to create a vHBA in order
to match the scsi_host1 parent name and to use validateable wwnn/wwpn.
This will allow for realistic testing.

Build fails with:

conf/node_device_conf.c:825:62: error: comparison of unsigned enum expression < 0 is always false [-Werror,-Wtautological-compare]
    if ((data->drm.type = virNodeDevDRMTypeFromString(type)) < 0) {
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
conf/node_device_conf.c:1801:59: error: comparison of unsigned enum expression < 0 is always false [-Werror,-Wtautological-compare]
        if ((type = virNodeDevDevnodeTypeFromString(tmp)) < 0) {
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
2 errors generated.

Fix by using intermediate variable to store the result similarly
to how it's done for other FromString* calls.

After 7f1bdec5 our nodedev driver is capable of
determining DRM devices (DRM stands for Direct Render Manager not
Digital rights management). There is still one bit missing
though: virConnectListAllNodeDevices() is capable of listing
either all devices or just those with specified capability. Well,
DRM capability is missing there.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Add a new attribute 'rendernode' to <gl> spice element.

Give it to QEMU if qemu supports it (queued for 2.9).
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Add a new 'drm' capability for Direct Rendering Manager (DRM) devices,
providing device type information.

Teach the udev backend to populate those devices.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

This should have been added with c4a4603d (or 0bdefd9b).
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>