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[libvirt] [PATCH 6/8] domain: Make <address type='pci'/> request address allocation



If a bare device <address type='pci'/> is specified, set an internal
flag address->auto_allocate. Individual hv drivers can then check for
this and act on it if they want, nothing is allocated in generic code.

If drivers allocate an address, they are expected to unset auto_allocate.
Generic domain conf code then checks at XML format time to ensure no
device addresses still have auto_allocate set; this ensures we aren't
formatting any bogus address XML, and informing the user if their
request didn't work. Add a genericxml2xml test case for this.

The auto_allocate property is a part of the generic address structure
and not the PCI specific bits, this will make it easier to reuse with
other address types too.

One note: we detect <address type='pci'/> by counting it's XML properties,
rather than comparing specifically against parsed values, which seems
easier to maintain.
---
 docs/schemas/domaincommon.rng                      |  5 +++-
 src/conf/domain_conf.c                             | 29 +++++++++++++++++++++-
 src/conf/domain_conf.h                             |  1 +
 .../generic-pci-autofill-addr.xml                  | 27 ++++++++++++++++++++
 tests/genericxml2xmltest.c                         | 17 +++++++++----
 5 files changed, 72 insertions(+), 7 deletions(-)
 create mode 100644 tests/genericxml2xmlindata/generic-pci-autofill-addr.xml

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6ca937c..d083250 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4471,7 +4471,10 @@
           <attribute name="type">
             <value>pci</value>
           </attribute>
-          <ref name="pciaddress"/>
+          <choice>
+            <ref name="pciaddress"/>
+            <empty/>
+          </choice>
         </group>
         <group>
           <attribute name="type">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index bc4e369..bbc42a4 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -3827,6 +3827,23 @@ virDomainDefPostParseTimer(virDomainDefPtr def)
 }
 
 
+ static int
+virDomainCheckUnallocatedDeviceAddrs(virDomainDefPtr def ATTRIBUTE_UNUSED,
+                                     virDomainDeviceDefPtr dev,
+                                     virDomainDeviceInfoPtr info,
+                                     void *data ATTRIBUTE_UNUSED)
+{
+    if (!info->auto_allocate)
+        return 0;
+
+    virReportError(VIR_ERR_INTERNAL_ERROR,
+        _("driver didn't allocate requested address type '%s' for device '%s'"),
+        virDomainDeviceAddressTypeToString(info->type),
+        virDomainDeviceTypeToString(dev->type));
+    return -1;
+}
+
+
 static int
 virDomainDefPostParseInternal(virDomainDefPtr def,
                               virCapsPtr caps ATTRIBUTE_UNUSED,
@@ -3851,6 +3868,11 @@ virDomainDefPostParseInternal(virDomainDefPtr def,
     if (virDomainDefPostParseTimer(def) < 0)
         return -1;
 
+    /* ensure the driver filled in any auto_allocate addrs */
+    if (virDomainDeviceInfoIterate(def, virDomainCheckUnallocatedDeviceAddrs,
+                                   NULL) < 0)
+        return -1;
+
     if (virDomainDefAddImplicitDevices(def) < 0)
         return -1;
 
@@ -4872,8 +4894,13 @@ virDomainDeviceInfoParseXML(xmlNodePtr node,
 
     switch ((virDomainDeviceAddressType) info->type) {
     case VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI:
-        if (virDevicePCIAddressParseXML(address, &info->addr.pci) < 0)
+        if (virXMLPropertyCount(address) == 1) {
+            /* Bare <address type='pci'/> is a request to allocate
+               the address. */
+            info->auto_allocate = true;
+        } else if (virDevicePCIAddressParseXML(address, &info->addr.pci) < 0) {
             goto cleanup;
+        }
         break;
 
     case VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index aba53a2..dd9d0b1 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -346,6 +346,7 @@ struct _virDomainDeviceInfo {
      */
     char *alias;
     int type; /* virDomainDeviceAddressType */
+    bool auto_allocate;
     union {
         virDevicePCIAddress pci;
         virDomainDeviceDriveAddress drive;
diff --git a/tests/genericxml2xmlindata/generic-pci-autofill-addr.xml b/tests/genericxml2xmlindata/generic-pci-autofill-addr.xml
new file mode 100644
index 0000000..06eadb6
--- /dev/null
+++ b/tests/genericxml2xmlindata/generic-pci-autofill-addr.xml
@@ -0,0 +1,27 @@
+<domain type='test'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='vda' bus='virtio'/>
+      <address type='pci'/>
+    </disk>
+    <controller type='usb' index='0'>
+      <address type='pci'/>
+    </controller>
+  </devices>
+</domain>
diff --git a/tests/genericxml2xmltest.c b/tests/genericxml2xmltest.c
index 666fc86..b329d10 100644
--- a/tests/genericxml2xmltest.c
+++ b/tests/genericxml2xmltest.c
@@ -21,6 +21,7 @@ struct testInfo {
     const char *name;
     int different;
     bool inactive_only;
+    testCompareDomXML2XMLFlags compare_flags;
 };
 
 static int
@@ -39,7 +40,7 @@ testCompareXMLToXMLHelper(const void *data)
 
     ret = testCompareDomXML2XMLFiles(caps, xmlopt, xml_in,
                                      info->different ? xml_out : xml_in,
-                                     !info->inactive_only, 0,
+                                     !info->inactive_only, info->compare_flags,
                                      NULL, NULL, 0);
  cleanup:
     VIR_FREE(xml_in);
@@ -59,21 +60,27 @@ mymain(void)
     if (!(xmlopt = virTestGenericDomainXMLConfInit()))
         return EXIT_FAILURE;
 
-#define DO_TEST_FULL(name, is_different, inactive)                      \
+#define DO_TEST_FULL(name, is_different, inactive, compare_flags)       \
     do {                                                                \
-        const struct testInfo info = {name, is_different, inactive};    \
+        const struct testInfo info = {name, is_different,               \
+                                      inactive, compare_flags};         \
         if (virtTestRun("GENERIC XML-2-XML " name,                      \
                         testCompareXMLToXMLHelper, &info) < 0)          \
             ret = -1;                                                   \
     } while (0)
 
 #define DO_TEST(name) \
-    DO_TEST_FULL(name, 0, false)
+    DO_TEST_FULL(name, 0, false, 0)
+
+#define DO_TEST_PARSE_ERROR(name) \
+    DO_TEST_FULL(name, 0, false,  \
+                 TEST_COMPARE_DOM_XML2XML_FLAG_EXPECT_PARSE_ERROR)
 
 #define DO_TEST_DIFFERENT(name) \
-    DO_TEST_FULL(name, 1, false)
+    DO_TEST_FULL(name, 1, false, 0)
 
     DO_TEST_DIFFERENT("disk-virtio");
+    DO_TEST_PARSE_ERROR("pci-autofill-addr");
 
     virObjectUnref(caps);
     virObjectUnref(xmlopt);
-- 
2.5.0


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