Re: [libvirt PATCH v2 05/10] nodedev: add mdev support to virNodeDeviceCreateXML()

With recent additions to the node device xml schema, an xml schema can now describe a mdev device sufficiently for libvirt to create and start the device using the mdevctl utility. Note that some of the the configuration for a mediated device must be passed to mdevctl as a JSON-formatted file. In order to avoid creating and cleaning up temporary files, the JSON is instead fed to stdin and we pass the filename /dev/stdin to mdevctl. While this may not be portable, neither are mediated devices, so I don't believe it should cause any problems. Signed-off-by: Jonathon Jongsma <jjongsma(a)redhat.com&gt; ---

+static int +virNodeDeviceObjListFindMediatedDeviceByUUIDCallback(const void *payload, + const void *name G_GNUC_UNUSED, + const void *opaque G_GNUC_UNUSED)

+ + +virCommandPtr +nodeDeviceGetMdevctlStartCommand(virNodeDeviceDefPtr def, + bool persist, + char **uuid_out) +{ + virCommandPtr cmd; + const char *subcommand; + g_autofree char *json = NULL; + g_autofree char *mdevctl = virFindFileInPath(MDEVCTL); + g_autofree char *parent_pci = nodeDeviceFindAddressByName(def->parent); + + if (!mdevctl) + return NULL; + + if (!parent_pci) { + virReportError(VIR_ERR_NO_NODE_DEVICE, + _("unable to find PCI address for parent device '%s'"), def->parent); + return NULL; + } + + if (nodeDeviceDefToMdevctlConfig(def, &json) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("couldn't convert node device def to mdevctl JSON")); + return NULL; + } + + if (persist) + subcommand = "define";