virDomainXMLOption: Introduce virDomainABIStabilityDomain

While checking for ABI stability, drivers might pose additional
checks that are not valid for general case. For instance, qemu
driver might check some memory backing attributes because of how
qemu works. But those attributes may work well in other drivers.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

src/bhyve/bhyve_domain.c

@@ -144,7 +144,7 @@ virBhyveDriverCreateXMLConf(bhyveConnPtr driver)
     virBhyveDriverDomainDefParserConfig.priv = driver;
     return virDomainXMLOptionNew(&virBhyveDriverDomainDefParserConfig,
                                  &virBhyveDriverPrivateDataCallbacks,
-                                 NULL);
+                                 NULL, NULL);
 }
 
 virDomainDefParserConfig virBhyveDriverDomainDefParserConfig = {

src/conf/domain_conf.c

@@ -76,6 +76,9 @@ struct _virDomainXMLOption {
 
     /* XML namespace callbacks */
     virDomainXMLNamespace ns;
+
+    /* ABI stability callbacks */
+    virDomainABIStability abi;
 };
 
 #define VIR_DOMAIN_DEF_FORMAT_COMMON_FLAGS             \
@@ -1050,7 +1053,8 @@ virDomainKeyWrapDefParseXML(virDomainDefPtr def, xmlXPathContextPtr ctxt)
 virDomainXMLOptionPtr
 virDomainXMLOptionNew(virDomainDefParserConfigPtr config,
                       virDomainXMLPrivateDataCallbacksPtr priv,
-                      virDomainXMLNamespacePtr xmlns)
+                      virDomainXMLNamespacePtr xmlns,
+                      virDomainABIStabilityPtr abi)
 {
     virDomainXMLOptionPtr xmlopt;
 
@@ -1069,6 +1073,9 @@ virDomainXMLOptionNew(virDomainDefParserConfigPtr config,
     if (xmlns)
         xmlopt->ns = *xmlns;
 
+    if (abi)
+        xmlopt->abi = *abi;
+
     /* Technically this forbids to use one of Xerox's MAC address prefixes in
      * our hypervisor drivers. This shouldn't ever be a problem.
      *
@@ -19984,6 +19991,7 @@ virDomainDefVcpuCheckAbiStability(virDomainDefPtr src,
 bool
 virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
                                    virDomainDefPtr dst,
+                                   virDomainXMLOptionPtr xmlopt,
                                    unsigned int flags)
 {
     size_t i;
@@ -20385,6 +20393,10 @@ virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
         !virDomainIOMMUDefCheckABIStability(src->iommu, dst->iommu))
         goto error;
 
+    if (xmlopt && xmlopt->abi.domain &&
+        !xmlopt->abi.domain(src, dst))
+        goto error;
+
     /* Coverity is not very happy with this - all dead_error_condition */
 #if !STATIC_ANALYSIS
     /* This switch statement is here to trigger compiler warning when adding
@@ -20444,9 +20456,10 @@ virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
 
 bool
 virDomainDefCheckABIStability(virDomainDefPtr src,
-                              virDomainDefPtr dst)
+                              virDomainDefPtr dst,
+                              virDomainXMLOptionPtr xmlopt)
 {
-    return virDomainDefCheckABIStabilityFlags(src, dst, 0);
+    return virDomainDefCheckABIStabilityFlags(src, dst, xmlopt, 0);
 }
 
 

src/conf/domain_conf.h

@@ -2537,9 +2537,19 @@ struct _virDomainXMLPrivateDataCallbacks {
     virDomainXMLPrivateDataParseFunc  parse;
 };
 
+typedef bool (*virDomainABIStabilityDomain)(const virDomainDef *src,
+                                            const virDomainDef *dst);
+
+typedef struct _virDomainABIStability virDomainABIStability;
+typedef virDomainABIStability *virDomainABIStabilityPtr;
+struct _virDomainABIStability {
+    virDomainABIStabilityDomain domain;
+};
+
 virDomainXMLOptionPtr virDomainXMLOptionNew(virDomainDefParserConfigPtr config,
                                             virDomainXMLPrivateDataCallbacksPtr priv,
-                                            virDomainXMLNamespacePtr xmlns);
+                                            virDomainXMLNamespacePtr xmlns,
+                                            virDomainABIStabilityPtr abi);
 
 void virDomainNetGenerateMAC(virDomainXMLOptionPtr xmlopt, virMacAddrPtr mac);
 
@@ -2806,10 +2816,12 @@ virDomainObjPtr virDomainObjParseFile(const char *filename,
                                       unsigned int flags);
 
 bool virDomainDefCheckABIStability(virDomainDefPtr src,
-                                   virDomainDefPtr dst);
+                                   virDomainDefPtr dst,
+                                   virDomainXMLOptionPtr xmlopt);
 
 bool virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
                                         virDomainDefPtr dst,
+                                        virDomainXMLOptionPtr xmlopt,
                                         unsigned int flags);
 
 int virDomainDefAddImplicitDevices(virDomainDefPtr def);

src/conf/snapshot_conf.c

@@ -1198,6 +1198,7 @@ virDomainSnapshotRedefinePrep(virDomainPtr domain,
                               virDomainObjPtr vm,
                               virDomainSnapshotDefPtr *defptr,
                               virDomainSnapshotObjPtr *snap,
+                              virDomainXMLOptionPtr xmlopt,
                               bool *update_current,
                               unsigned int flags)
 {
@@ -1286,7 +1287,7 @@ virDomainSnapshotRedefinePrep(virDomainPtr domain,
         if (other->def->dom) {
             if (def->dom) {
                 if (!virDomainDefCheckABIStability(other->def->dom,
-                                                   def->dom))
+                                                   def->dom, xmlopt))
                     goto cleanup;
             } else {
                 /* Transfer the domain def */

src/conf/snapshot_conf.h

@@ -181,6 +181,7 @@ int virDomainSnapshotRedefinePrep(virDomainPtr domain,
                                   virDomainObjPtr vm,
                                   virDomainSnapshotDefPtr *def,
                                   virDomainSnapshotObjPtr *snap,
+                                  virDomainXMLOptionPtr xmlopt,
                                   bool *update_current,
                                   unsigned int flags);
 

src/libxl/libxl_conf.c

@@ -2255,5 +2255,5 @@ libxlCreateXMLConf(void)
 {
     return virDomainXMLOptionNew(&libxlDomainDefParserConfig,
                                  &libxlDomainXMLPrivateDataCallbacks,
-                                 NULL);
+                                 NULL, NULL);
 }

src/libxl/libxl_domain.c

@@ -1452,7 +1452,9 @@ libxlDomainDefCheckABIStability(libxlDriverPrivatePtr driver,
         !(migratableDefDst = virDomainDefCopy(dst, cfg->caps, driver->xmlopt, NULL, true)))
         goto cleanup;
 
-    ret = virDomainDefCheckABIStability(migratableDefSrc, migratableDefDst);
+    ret = virDomainDefCheckABIStability(migratableDefSrc,
+                                        migratableDefDst,
+                                        driver->xmlopt);
 
  cleanup:
     virDomainDefFree(migratableDefSrc);

src/lxc/lxc_conf.c

@@ -215,7 +215,8 @@ lxcDomainXMLConfInit(void)
 {
     return virDomainXMLOptionNew(&virLXCDriverDomainDefParserConfig,
                                  &virLXCDriverPrivateDataCallbacks,
-                                 &virLXCDriverDomainXMLNamespace);
+                                 &virLXCDriverDomainXMLNamespace,
+                                 NULL);
 }
 
 

src/openvz/openvz_driver.c

@@ -1483,7 +1483,7 @@ static virDrvOpenStatus openvzConnectOpen(virConnectPtr conn,
         goto cleanup;
 
     if (!(driver->xmlopt = virDomainXMLOptionNew(&openvzDomainDefParserConfig,
-                                                 NULL, NULL)))
+                                                 NULL, NULL, NULL)))
         goto cleanup;
 
     if (openvzLoadDomains(driver) < 0)

src/phyp/phyp_driver.c

@@ -1202,7 +1202,7 @@ phypConnectOpen(virConnectPtr conn,
         goto failure;
 
     if (!(phyp_driver->xmlopt = virDomainXMLOptionNew(&virPhypDriverDomainDefParserConfig,
-                                                      NULL, NULL)))
+                                                      NULL, NULL, NULL)))
         goto failure;
 
     conn->privateData = phyp_driver;

src/qemu/qemu_capabilities.c

@@ -5026,7 +5026,7 @@ virQEMUCapsInitQMPCommandRun(virQEMUCapsInitQMPCommandPtr cmd,
         goto ignore;
     }
 
-    if (!(xmlopt = virDomainXMLOptionNew(NULL, NULL, NULL)) ||
+    if (!(xmlopt = virDomainXMLOptionNew(NULL, NULL, NULL, NULL)) ||
         !(cmd->vm = virDomainObjNew(xmlopt)))
         goto cleanup;
 

src/qemu/qemu_conf.c

@@ -909,7 +909,8 @@ virQEMUDriverCreateXMLConf(virQEMUDriverPtr driver)
     virQEMUDriverDomainDefParserConfig.priv = driver;
     return virDomainXMLOptionNew(&virQEMUDriverDomainDefParserConfig,
                                  &virQEMUDriverPrivateDataCallbacks,
-                                 &virQEMUDriverDomainXMLNamespace);
+                                 &virQEMUDriverDomainXMLNamespace,
+                                 NULL);
 }
 
 

src/qemu/qemu_domain.c

@@ -5839,6 +5839,7 @@ qemuDomainDefCheckABIStability(virQEMUDriverPtr driver,
 
     if (!virDomainDefCheckABIStabilityFlags(migratableDefSrc,
                                             migratableDefDst,
+                                            driver->xmlopt,
                                             check_flags))
         goto cleanup;
 

src/qemu/qemu_driver.c

@@ -6142,7 +6142,7 @@ qemuDomainSaveImageUpdateDef(virQEMUDriverPtr driver,
                                           VIR_DOMAIN_XML_MIGRATABLE)))
         goto cleanup;
 
-    if (!virDomainDefCheckABIStability(def, newdef_migr)) {
+    if (!virDomainDefCheckABIStability(def, newdef_migr, driver->xmlopt)) {
         virErrorPtr err = virSaveLastError();
 
         /* Due to a bug in older version of external snapshot creation
@@ -6151,7 +6151,7 @@ qemuDomainSaveImageUpdateDef(virQEMUDriverPtr driver,
          * saved XML type, we need to check the ABI compatibility against
          * the user provided XML if the check against the migratable XML
          * fails. Snapshots created prior to v1.1.3 have this issue. */
-        if (!virDomainDefCheckABIStability(def, newdef)) {
+        if (!virDomainDefCheckABIStability(def, newdef, driver->xmlopt)) {
             virSetError(err);
             virFreeError(err);
             goto cleanup;
@@ -14588,6 +14588,7 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
 
     if (redefine) {
         if (virDomainSnapshotRedefinePrep(domain, vm, &def, &snap,
+                                          driver->xmlopt,
                                           &update_current, flags) < 0)
             goto endjob;
     } else {

src/security/virt-aa-helper.c

@@ -667,7 +667,7 @@ get_definition(vahControl * ctl, const char *xmlStr)
         goto exit;
     }
 
-    if (!(ctl->xmlopt = virDomainXMLOptionNew(NULL, NULL, NULL))) {
+    if (!(ctl->xmlopt = virDomainXMLOptionNew(NULL, NULL, NULL, NULL))) {
         vah_error(ctl, 0, _("Failed to create XML config object"));
         goto exit;
     }

src/test/test_driver.c

@@ -414,7 +414,7 @@ testDriverNew(void)
         goto error;
     }
 
-    if (!(ret->xmlopt = virDomainXMLOptionNew(NULL, NULL, &ns)) ||
+    if (!(ret->xmlopt = virDomainXMLOptionNew(NULL, NULL, &ns, NULL)) ||
         !(ret->eventState = virObjectEventStateNew()) ||
         !(ret->ifaces = virInterfaceObjListNew()) ||
         !(ret->domains = virDomainObjListNew()) ||
@@ -6373,6 +6373,7 @@ testDomainSnapshotCreateXML(virDomainPtr domain,
 
     if (redefine) {
         if (virDomainSnapshotRedefinePrep(domain, vm, &def, &snap,
+                                          privconn->xmlopt,
                                           &update_current, flags) < 0)
             goto cleanup;
     } else {
@@ -6648,7 +6649,8 @@ testDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
         if (virDomainObjIsActive(vm)) {
             /* Transitions 5, 6, 8, 9 */
             /* Check for ABI compatibility.  */
-            if (!virDomainDefCheckABIStability(vm->def, config)) {
+            if (!virDomainDefCheckABIStability(vm->def, config,
+                                               privconn->xmlopt)) {
                 virErrorPtr err = virGetLastError();
 
                 if (!(flags & VIR_DOMAIN_SNAPSHOT_REVERT_FORCE)) {

src/uml/uml_driver.c

@@ -533,7 +533,7 @@ umlStateInitialize(bool privileged,
         goto out_of_memory;
 
     if (!(uml_driver->xmlopt = virDomainXMLOptionNew(&umlDriverDomainDefParserConfig,
-                                                     &privcb, NULL)))
+                                                     &privcb, NULL, NULL)))
         goto error;
 
     if ((uml_driver->inotifyFD = inotify_init()) < 0) {

src/vbox/vbox_common.c

@@ -142,7 +142,7 @@ vboxDriverObjNew(void)
 
     if (!(driver->caps = vboxCapsInit()) ||
         !(driver->xmlopt = virDomainXMLOptionNew(&vboxDomainDefParserConfig,
-                                                 NULL, NULL)))
+                                                 NULL, NULL, NULL)))
         goto cleanup;
 
     return driver;

src/vmware/vmware_driver.c

@@ -114,7 +114,7 @@ vmwareDomainXMLConfigInit(void)
     virDomainXMLPrivateDataCallbacks priv = { .alloc = vmwareDataAllocFunc,
                                               .free = vmwareDataFreeFunc };
 
-    return virDomainXMLOptionNew(&vmwareDomainDefParserConfig, &priv, NULL);
+    return virDomainXMLOptionNew(&vmwareDomainDefParserConfig, &priv, NULL, NULL);
 }
 
 static virDrvOpenStatus

src/vmx/vmx.c

@@ -591,7 +591,7 @@ virDomainXMLOptionPtr
 virVMXDomainXMLConfInit(void)
 {
     return virDomainXMLOptionNew(&virVMXDomainDefParserConfig, NULL,
-                                 &virVMXDomainXMLNamespace);
+                                 &virVMXDomainXMLNamespace, NULL);
 }
 
 char *

src/vz/vz_driver.c

@@ -328,7 +328,7 @@ vzDriverObjNew(void)
     if (!(driver->caps = vzBuildCapabilities()) ||
         !(driver->xmlopt = virDomainXMLOptionNew(&vzDomainDefParserConfig,
                                                  &vzDomainXMLPrivateDataCallbacksPtr,
-                                                 NULL)) ||
+                                                 NULL, NULL)) ||
         !(driver->domains = virDomainObjListNew()) ||
         !(driver->domainEventState = virObjectEventStateNew()) ||
         (vzInitVersion(driver) < 0) ||

src/xen/xen_driver.c

@@ -401,7 +401,7 @@ virDomainXMLOptionPtr
 xenDomainXMLConfInit(void)
 {
     return virDomainXMLOptionNew(&xenDomainDefParserConfig,
-                                 NULL, NULL);
+                                 NULL, NULL, NULL);
 }
 
 

src/xenapi/xenapi_driver.c

@@ -200,7 +200,7 @@ xenapiConnectOpen(virConnectPtr conn, virConnectAuthPtr auth,
     }
 
     if (!(privP->xmlopt = virDomainXMLOptionNew(&xenapiDomainDefParserConfig,
-                                                NULL, NULL))) {
+                                                NULL, NULL, NULL))) {
         xenapiSessionErrorHandler(conn, VIR_ERR_INTERNAL_ERROR,
                                   _("Failed to create XML conf object"));
         goto error;

tests/bhyveargv2xmltest.c

@@ -130,7 +130,8 @@ mymain(void)
     if ((driver.caps = virBhyveCapsBuild()) == NULL)
         return EXIT_FAILURE;
 
-    if ((driver.xmlopt = virDomainXMLOptionNew(NULL, NULL, NULL)) == NULL)
+    if ((driver.xmlopt = virDomainXMLOptionNew(NULL, NULL,
+                                               NULL, NULL)) == NULL)
         return EXIT_FAILURE;
 
 # define DO_TEST_FULL(name, flags)                            \

tests/qemuargv2xmltest.c

@@ -95,7 +95,7 @@ static int testCompareXMLToArgvFiles(const char *xmlfile,
     if (testSanitizeDef(vmdef) < 0)
         goto fail;
 
-    if (!virDomainDefCheckABIStability(vmdef, vmdef)) {
+    if (!virDomainDefCheckABIStability(vmdef, vmdef, driver.xmlopt)) {
         VIR_TEST_DEBUG("ABI stability check failed on %s", xmlfile);
         goto fail;
     }

tests/qemuxml2argvtest.c

@@ -463,7 +463,7 @@ testCompareXMLToArgv(const void *data)
     if (virBitmapParse("0-3", &priv->autoNodeset, 4) < 0)
         goto cleanup;
 
-    if (!virDomainDefCheckABIStability(vm->def, vm->def)) {
+    if (!virDomainDefCheckABIStability(vm->def, vm->def, driver.xmlopt)) {
         VIR_TEST_DEBUG("ABI stability check failed on %s", xml);
         goto cleanup;
     }

tests/sexpr2xmltest.c

@@ -57,7 +57,7 @@ testCompareFiles(const char *xml, const char *sexpr)
                                  tty, vncport, caps, xmlopt)))
       goto fail;
 
-  if (!virDomainDefCheckABIStability(def, def)) {
+  if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
       fprintf(stderr, "ABI stability check failed on %s", xml);
       goto fail;
   }

tests/testutils.c

@@ -1136,7 +1136,7 @@ virDomainXMLOptionPtr virTestGenericDomainXMLConfInit(void)
 {
     return virDomainXMLOptionNew(&virTestGenericDomainDefParserConfig,
                                  &virTestGenericPrivateDataCallbacks,
-                                 NULL);
+                                 NULL, NULL);
 }
 
 
@@ -1169,7 +1169,7 @@ testCompareDomXML2XMLFiles(virCapsPtr caps, virDomainXMLOptionPtr xmlopt,
         goto out;
     }
 
-    if (!virDomainDefCheckABIStability(def, def)) {
+    if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
         VIR_TEST_DEBUG("ABI stability check failed on %s", infile);
         result = TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_STABILITY;
         goto out;

tests/vmx2xmltest.c

@@ -81,7 +81,7 @@ testCompareFiles(const char *vmx, const char *xml)
     if (!(def = virVMXParseConfig(&ctx, xmlopt, caps, vmxData)))
         goto cleanup;
 
-    if (!virDomainDefCheckABIStability(def, def)) {
+    if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
         fprintf(stderr, "ABI stability check failed on %s", vmx);
         goto cleanup;
     }

tests/xlconfigtest.c

@@ -97,7 +97,7 @@ testCompareParseXML(const char *xlcfg, const char *xml, bool replaceVars)
             goto fail;
     }
 
-    if (!virDomainDefCheckABIStability(def, def)) {
+    if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
         fprintf(stderr, "ABI stability check failed on %s", xml);
         goto fail;
     }

tests/xmconfigtest.c

@@ -67,7 +67,7 @@ testCompareParseXML(const char *xmcfg, const char *xml)
                                       VIR_DOMAIN_DEF_PARSE_INACTIVE)))
         goto fail;
 
-    if (!virDomainDefCheckABIStability(def, def)) {
+    if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
         fprintf(stderr, "ABI stability check failed on %s", xml);
         goto fail;
     }

tests/xml2sexprtest.c

@@ -31,7 +31,7 @@ testCompareFiles(const char *xml, const char *sexpr)
                                     VIR_DOMAIN_DEF_PARSE_INACTIVE)))
       goto fail;
 
-  if (!virDomainDefCheckABIStability(def, def)) {
+  if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
       fprintf(stderr, "ABI stability check failed on %s", xml);
       goto fail;
   }

tests/xml2vmxtest.c

@@ -82,7 +82,7 @@ testCompareFiles(const char *xml, const char *vmx, int virtualHW_version)
     if (def == NULL)
         goto failure;
 
-    if (!virDomainDefCheckABIStability(def, def)) {
+    if (!virDomainDefCheckABIStability(def, def, xmlopt)) {
         fprintf(stderr, "ABI stability check failed on %s", xml);
         goto failure;
     }