lib: Add API to dump xml configuration of managed save state domain

Similar to domainSaveImageGetXMLDesc this commit adds domainManagedSaveGetXMLDesc
API which allows to get the xml of managed save state domain.
Signed-off-by: NKothapally Madhu Pavan <kmp@linux.vnet.ibm.com>

include/libvirt/libvirt-domain.h

@@ -1213,6 +1213,8 @@ int                    virDomainHasManagedSaveImage(virDomainPtr dom,
                                                     unsigned int flags);
 int                    virDomainManagedSaveRemove(virDomainPtr dom,
                                                   unsigned int flags);
+char *                 virDomainManagedSaveGetXMLDesc(virDomainPtr domain,
+                                                      unsigned int flags);
 
 /*
  * Domain core dump

src/driver-hypervisor.h

@@ -750,6 +750,10 @@ typedef int
 (*virDrvDomainManagedSaveRemove)(virDomainPtr domain,
                                  unsigned int flags);
 
+typedef char *
+(*virDrvDomainManagedSaveGetXMLDesc)(virDomainPtr domain,
+                                     unsigned int flags);
+
 typedef virDomainSnapshotPtr
 (*virDrvDomainSnapshotCreateXML)(virDomainPtr domain,
                                  const char *xmlDesc,
@@ -1428,6 +1432,7 @@ struct _virHypervisorDriver {
     virDrvDomainManagedSave domainManagedSave;
     virDrvDomainHasManagedSaveImage domainHasManagedSaveImage;
     virDrvDomainManagedSaveRemove domainManagedSaveRemove;
+    virDrvDomainManagedSaveGetXMLDesc domainManagedSaveGetXMLDesc;
     virDrvDomainSnapshotCreateXML domainSnapshotCreateXML;
     virDrvDomainSnapshotGetXMLDesc domainSnapshotGetXMLDesc;
     virDrvDomainSnapshotNum domainSnapshotNum;

src/libvirt-domain.c

@@ -9339,6 +9339,55 @@ virDomainManagedSaveRemove(virDomainPtr dom, unsigned int flags)
 }
 
 
+/**
+ * virDomainManagedSaveGetXMLDesc:
+ * @domain: a domain object
+ * @flags: bitwise-OR of subset of virDomainXMLFlags
+ *
+ * This method will extract the XML description of the managed save
+ * state file of a domain.
+ *
+ * No security-sensitive data will be included unless @flags contains
+ * VIR_DOMAIN_XML_SECURE; this flag is rejected on read-only
+ * connections.  For this API, @flags should not contain either
+ * VIR_DOMAIN_XML_INACTIVE or VIR_DOMAIN_XML_UPDATE_CPU.
+ *
+ * Returns a 0 terminated UTF-8 encoded XML instance, or NULL in case of
+ * error.  The caller must free() the returned value.
+ */
+char *
+virDomainManagedSaveGetXMLDesc(virDomainPtr domain, unsigned int flags)
+{
+    virConnectPtr conn;
+
+    VIR_DOMAIN_DEBUG(domain, "flags=%x", flags);
+
+    virResetLastError();
+
+    virCheckDomainReturn(domain, NULL);
+    conn = domain->conn;
+
+    if ((conn->flags & VIR_CONNECT_RO) && (flags & VIR_DOMAIN_XML_SECURE)) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("virDomainManagedSaveGetXMLDesc with secure flag"));
+        goto error;
+    }
+
+    if (conn->driver->domainManagedSaveGetXMLDesc) {
+        char *ret;
+        ret = conn->driver->domainManagedSaveGetXMLDesc(domain, flags);
+        if (!ret)
+            goto error;
+        return ret;
+    }
+
+    virReportUnsupportedError();
+
+ error:
+    virDispatchError(domain->conn);
+    return NULL;
+}
+
 
 /**
  * virDomainOpenConsole:

src/libvirt_public.syms

@@ -771,5 +771,6 @@ LIBVIRT_3.4.0 {
 LIBVIRT_3.7.0 {
     global:
         virDomainMigrateGetMaxDowntime;
+        virDomainManagedSaveGetXMLDesc;
 } LIBVIRT_3.4.0;
 # .... define new API here using predicted next version number ....

src/remote/remote_driver.c

@@ -8411,6 +8411,7 @@ static virHypervisorDriver hypervisor_driver = {
     .domainManagedSave = remoteDomainManagedSave, /* 0.8.0 */
     .domainHasManagedSaveImage = remoteDomainHasManagedSaveImage, /* 0.8.0 */
     .domainManagedSaveRemove = remoteDomainManagedSaveRemove, /* 0.8.0 */
+    .domainManagedSaveGetXMLDesc = remoteDomainManagedSaveGetXMLDesc, /* 3.7.0 */
     .domainSnapshotCreateXML = remoteDomainSnapshotCreateXML, /* 0.8.0 */
     .domainSnapshotGetXMLDesc = remoteDomainSnapshotGetXMLDesc, /* 0.8.0 */
     .domainSnapshotNum = remoteDomainSnapshotNum, /* 0.8.0 */

src/remote/remote_protocol.x

@@ -2556,6 +2556,15 @@ struct remote_domain_managed_save_remove_args {
     unsigned int flags;
 };
 
+struct remote_domain_managed_save_get_xml_desc_args {
+    remote_nonnull_domain dom;
+    unsigned int flags;
+};
+
+struct remote_domain_managed_save_get_xml_desc_ret {
+    remote_nonnull_string xml;
+};
+
 struct remote_domain_snapshot_create_xml_args {
     remote_nonnull_domain dom;
     remote_nonnull_string xml_desc;
@@ -6079,6 +6088,12 @@ enum remote_procedure {
      * @generate: both
      * @acl: domain:migrate
      */
-    REMOTE_PROC_DOMAIN_MIGRATE_GET_MAX_DOWNTIME = 387
+    REMOTE_PROC_DOMAIN_MIGRATE_GET_MAX_DOWNTIME = 387,
 
+    /**
+     * @generate: both
+     * @acl: domain:read
+     * @acl: domain:read_secure:VIR_DOMAIN_XML_SECURE
+     */
+    REMOTE_PROC_DOMAIN_MANAGED_SAVE_GET_XML_DESC = 388
 };

src/remote_protocol-structs

@@ -1970,6 +1970,13 @@ struct remote_domain_managed_save_remove_args {
         remote_nonnull_domain      dom;
         u_int                      flags;
 };
+struct remote_domain_managed_save_get_xml_desc_args {
+        remote_nonnull_domain      dom;
+        u_int                      flags;
+};
+struct remote_domain_managed_save_get_xml_desc_ret {
+        remote_nonnull_string      xml;
+};
 struct remote_domain_snapshot_create_xml_args {
         remote_nonnull_domain      dom;
         remote_nonnull_string      xml_desc;
@@ -3241,4 +3248,5 @@ enum remote_procedure {
         REMOTE_PROC_DOMAIN_EVENT_BLOCK_THRESHOLD = 385,
         REMOTE_PROC_DOMAIN_SET_BLOCK_THRESHOLD = 386,
         REMOTE_PROC_DOMAIN_MIGRATE_GET_MAX_DOWNTIME = 387,
+        REMOTE_PROC_DOMAIN_MANAGED_SAVE_GET_XML_DESC = 388,
 };