qemu: homogenize MAC address in live & config when hotplugging a netdev

Prior to commit 55ce6564 (first in libvirt 4.6.0), the XML sent to
virDomainAttachDeviceFlags() was parsed only once, and the results of
that parse were inserted into both the live object of the running
domain and into the persistent config. Thus, if MAC address was
omitted from in XML for a network device (<interface>), both the live
and config object would have the same MAC address.

Commit 55ce6564 changed the code to parse the incoming XML twice -
once for live and once for config. This does eliminate the problem of
PCI (/scsi/sata) address conflicts caused by allocating an address
based on existing devices in live object, but then inserting the
result into the config (which may already have a device using that
address), BUT it also means that when the MAC address of a network
device hasn't been specified in the XML, each copy will get a
different auto-generated MAC address.

This results in the MAC address of the device changing the next time
the domain is shutdown and restarted, which creates havoc with the
guest OS's network config.

There have been several discussions about this in the last > 1 year,
attempting to find the ideal solution to this problem that makes MAC
addresses consistent and accounts for all sorts of corner cases with
PCI/scsi/sata addresses. All of these discussions fizzled out because
every proposal was either too difficult to implement or failed to fix
some esoteric case someone thought up.

So, in the interest of solving the MAC address problem while not
making the "other address" situation any worse than before, this patch
simply adds a qemuDomainAttachDeviceLiveAndConfigHomogenize() function
that (for now) copies the MAC address from the config object to the
live object (if the original xml had <mac address='blah'/> then this
will be an effective NOP (as the macs already match)).

Any downstream libvirt containing upstream commit
55ce6564 should have this patch as well.

https://bugzilla.redhat.com/1783411Signed-off-by: NLaine Stump <laine@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_driver.c

@@ -8623,6 +8623,35 @@ qemuDomainUpdateDeviceConfig(virDomainDefPtr vmdef,
     return 0;
 }
 
+
+static void
+qemuDomainAttachDeviceLiveAndConfigHomogenize(const virDomainDeviceDef *devConf,
+                                              virDomainDeviceDefPtr devLive)
+{
+    /*
+     * Fixup anything that needs to be identical in the live and
+     * config versions of DeviceDef, but might not be. Do this by
+     * changing the contents of devLive. This is done after all
+     * post-parse tweaks and validation, so be very careful about what
+     * changes are made. (For example, it would be a very bad idea to
+     * change assigned PCI, scsi, or sata addresses, as it could lead
+     * to a conflict and there would be nothing to catch it except
+     * qemu itself!)
+     */
+
+    /* MAC address should be identical in both DeviceDefs, but if it
+     * wasn't specified in the XML, and was instead autogenerated, it
+     * will be different for the two since they are each the result of
+     * a separate parser call. If it *was* specified, it will already
+     * be the same, so copying does no harm.
+     */
+
+    if (devConf->type == VIR_DOMAIN_DEVICE_NET)
+        virMacAddrSet(&devLive->data.net->mac, &devConf->data.net->mac);
+
+}
+
+
 static int
 qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                     virQEMUDriverPtr driver,
@@ -8633,6 +8662,7 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
     virDomainDefPtr vmdef = NULL;
     g_autoptr(virQEMUDriverConfig) cfg = NULL;
     virDomainDeviceDefPtr devConf = NULL;
+    virDomainDeviceDef devConfSave = { 0 };
     virDomainDeviceDefPtr devLive = NULL;
     int ret = -1;
     unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE |
@@ -8657,6 +8687,13 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                                 parse_flags)))
             goto cleanup;
 
+        /*
+         * devConf will be NULLed out by
+         * qemuDomainAttachDeviceConfig(), so save it for later use by
+         * qemuDomainAttachDeviceLiveAndConfigHomogenize()
+         */
+        devConfSave = *devConf;
+
         if (virDomainDeviceValidateAliasForHotplug(vm, devConf,
                                                    VIR_DOMAIN_AFFECT_CONFIG) < 0)
             goto cleanup;
@@ -8678,6 +8715,9 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                                 parse_flags)))
             goto cleanup;
 
+        if (flags & VIR_DOMAIN_AFFECT_CONFIG)
+            qemuDomainAttachDeviceLiveAndConfigHomogenize(&devConfSave, devLive);
+
         if (virDomainDeviceValidateAliasForHotplug(vm, devLive,
                                                    VIR_DOMAIN_AFFECT_LIVE) < 0)
             goto cleanup;