[libvirt PATCH 3/7] nodedev: cache parent address in mdev caps

[Jonathon Jongsma]

mdevctl can report multiple defined devices with the same UUID
but different parents, including parents that don't actually exist on
the host machine. Libvirt sets the parent to the 'computer' device for
all of the mdevs that have nonexistent parents. Because of this, it's
possible that there are multiple devices with the same UUID and the same
'computer' device as their parent, so the combination of uuid and parent
'nodedev name is not guaranteed to be a unique name.

We need to ensure that each nodedev has a unique name. If we can't use
the UUID as a unique nodedev name, and we can't use the combination of
UUID and nodedev parent name, we need to find another solution. By
caching and using the parent name reported by mdevctl in combination
with the UUID, we can achieve a unique name. mdevctl guarantees that its
uuid/parent combination is unique.

This value will be used to set the mdev nodedev name in a following commit.

Signed-off-by: Jonathon Jongsma <jjongsma at redhat.com>
---
 src/conf/node_device_conf.h          |  1 +
 src/node_device/node_device_driver.c |  1 +
 src/node_device/node_device_udev.c   | 16 ++++++++++++++++
 3 files changed, 18 insertions(+)

diff --git a/src/conf/node_device_conf.h b/src/conf/node_device_conf.h
index a60562e4fe..556878b9a8 100644
--- a/src/conf/node_device_conf.h
+++ b/src/conf/node_device_conf.h
@@ -153,6 +153,7 @@ struct _virNodeDevCapMdev {
     char *uuid;
     virMediatedDeviceAttr **attributes;
     size_t nattributes;
+    char *parent_addr;
 };
 
 typedef struct _virNodeDevCapPCIDev virNodeDevCapPCIDev;
diff --git a/src/node_device/node_device_driver.c b/src/node_device/node_device_driver.c
index a3a261f08b..ad2ca2a614 100644
--- a/src/node_device/node_device_driver.c
+++ b/src/node_device/node_device_driver.c
@@ -1088,6 +1088,7 @@ nodeDeviceParseMdevctlChildDevice(const char *parent,
 
     mdev = &child->caps->data.mdev;
     mdev->uuid = g_strdup(uuid);
+    mdev->parent_addr = g_strdup(parent);
     mdev->type =
         g_strdup(virJSONValueObjectGetString(props, "mdev_type"));
 
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index f99578414d..e7db74b325 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -1024,6 +1024,7 @@ udevProcessMediatedDevice(struct udev_device *dev,
     char *linkpath = NULL;
     char *canonicalpath = NULL;
     virNodeDevCapMdev *data = &def->caps->data.mdev;
+    struct udev_device *parent_device = NULL;
 
     /* Because of a kernel uevent race, we might get the 'add' event prior to
      * the sysfs tree being ready, so any attempt to access any sysfs attribute
@@ -1051,6 +1052,21 @@ udevProcessMediatedDevice(struct udev_device *dev,
     if ((iommugrp = virMediatedDeviceGetIOMMUGroupNum(data->uuid)) < 0)
         goto cleanup;
 
+    /* lookup the address of parent device */
+    parent_device = udev_device_get_parent(dev);
+    if (parent_device) {
+        const char *parent_sysfs_path = udev_device_get_syspath(parent_device);
+        if (parent_sysfs_path)
+            data->parent_addr = g_path_get_basename(parent_sysfs_path);
+    }
+
+    if (!data->parent_addr) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Could not get parent of '%s'"),
+                       udev_device_get_syspath(dev));
+        return -1;
+    }
+
     udevGenerateDeviceName(dev, def, NULL);
 
     data->iommuGroupNumber = iommugrp;
-- 
2.31.1