diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index be35c82e7d0438244f4e7a28c8872e890b11f899..cc80efa73d01a18a9f721bffa63afd487e230790 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -675,6 +675,7 @@
 <pre>
 &lt;domain&gt;
   ...
+  &lt;maxMemory slots='16' unit='KiB'&gt;1524288&lt;/maxMemory&gt;
   &lt;memory unit='KiB'&gt;524288&lt;/memory&gt;
   &lt;currentMemory unit='KiB'&gt;524288&lt;/currentMemory&gt;
   ...
@@ -708,6 +709,25 @@
         <span class='since'><code>unit</code> since 0.9.11</span>,
         <span class='since'><code>dumpCore</code> since 0.10.2
         (QEMU only)</span></dd>
+      <dt><code>maxMemory</code></dt>
+      <dd>The run time maximum memory allocation of the guest. The initial
+        memory specified by either the <code>&lt;memory&gt;</code> element or
+        the NUMA cell size configuration can be increased by hot-plugging of
+        memory to the limit specified by this element.
+
+        The <code>unit</code> attribute behaves the same as for
+        <code>&lt;memory&gt;</code>.
+
+        The <code>slots</code> attribute specifies the number of slots
+        available for adding memory to the guest. The bounds are hypervisor
+        specific.
+
+        Note that due to alignment of the memory chunks added via memory
+        hotplug the full size allocation specified by this element may be
+        impossible to achieve.
+        <span class='since'>Since 1.2.14</span>
+      </dd>
+
       <dt><code>currentMemory</code></dt>
       <dd>The actual allocation of memory for the guest. This value can
         be less than the maximum allocation, to allow for ballooning
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index ebd9299371b68255d5a6cf9cbcdb3ae4dfd7dd9e..a0dee17123c63e9187f6c9e74f865c266cfc3d4d 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -592,6 +592,14 @@
           </optional>
         </element>
       </optional>
+      <optional>
+        <element name="maxMemory">
+          <ref name="scaledInteger"/>
+          <attribute name="slots">
+            <ref name="unsignedInt"/>
+          </attribute>
+        </element>
+      </optional>
       <optional>
         <element name="currentMemory">
           <ref name='scaledInteger'/>
diff --git a/src/bhyve/bhyve_domain.c b/src/bhyve/bhyve_domain.c
index ecb1758fc3431bfef01dcf04c3bbc77ab34be96f..25ef8524b021b0d674d633dc748ffdb76803adca 100644
--- a/src/bhyve/bhyve_domain.c
+++ b/src/bhyve/bhyve_domain.c
@@ -67,6 +67,10 @@ bhyveDomainDefPostParse(virDomainDefPtr def,
                                        VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT) < 0)
         return -1;
 
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index ae7d8df8ed2b6a9e7542cd41bd256e7ab4ae1883..16b7bbd8f8b3efadeabf956213851fe2317cc9a2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -981,6 +981,27 @@ virDomainBlkioDeviceParseXML(xmlNodePtr root,
 }
 
 
+/**
+ * virDomainDefCheckUnsupportedMemoryHotplug:
+ * @def: domain definition
+ *
+ * Returns -1 if the domain definition would enable memory hotplug via the
+ * <maxMemory> tunable and reports an error. Otherwise returns 0.
+ */
+int
+virDomainDefCheckUnsupportedMemoryHotplug(virDomainDefPtr def)
+{
+    /* memory hotplug tunables are not supported by this driver */
+    if (def->mem.max_memory > 0 || def->mem.memory_slots > 0) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("memory hotplug tunables <maxMemory> are not "
+                         "supported by this hypervisor driver"));
+        return -1;
+    }
+
+    return 0;
+}
+
 
 static void
 virDomainObjListDataFree(void *payload, const void *name ATTRIBUTE_UNUSED)
@@ -3238,6 +3259,22 @@ virDomainDefPostParseInternal(virDomainDefPtr def,
         def->mem.cur_balloon = virDomainDefGetMemoryActual(def);
     }
 
+    if ((def->mem.max_memory || def->mem.memory_slots) &&
+        !(def->mem.max_memory && def->mem.memory_slots)) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("both maximum memory size and "
+                         "memory slot count must be specified"));
+        return -1;
+    }
+
+    if (def->mem.max_memory &&
+        def->mem.max_memory < virDomainDefGetMemoryActual(def)) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("maximum memory size must be equal or greater than "
+                         "the actual memory size"));
+        return -1;
+    }
+
     /*
      * Some really crazy backcompat stuff for consoles
      *
@@ -13264,6 +13301,16 @@ virDomainDefParseXML(xmlDocPtr xml,
                              &def->mem.cur_balloon, false, true) < 0)
         goto error;
 
+    if (virDomainParseMemory("./maxMemory[1]", NULL, ctxt,
+                             &def->mem.max_memory, false, false) < 0)
+        goto error;
+
+    if (virXPathUInt("string(./maxMemory[1]/@slots)", ctxt, &def->mem.memory_slots) == -2) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("Failed to parse memory slot count"));
+        goto error;
+    }
+
     /* and info about it */
     if ((tmp = virXPathString("string(./memory[1]/@dumpCore)", ctxt)) &&
         (def->mem.dump_core = virTristateSwitchTypeFromString(tmp)) <= 0) {
@@ -16190,6 +16237,19 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
     if (!virDomainNumaCheckABIStability(src->numa, dst->numa))
         goto error;
 
+    if (src->mem.memory_slots != dst->mem.memory_slots) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("Target domain memory slots count '%u' doesn't match source '%u"),
+                       dst->mem.memory_slots, src->mem.memory_slots);
+        goto error;
+    }
+    if (src->mem.max_memory != dst->mem.max_memory) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("Target maximum memory size '%llu' doesn't match source '%llu'"),
+                       dst->mem.max_memory, src->mem.max_memory);
+        goto error;
+    }
+
     if (src->vcpus != dst->vcpus) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain vCPU count %d does not match source %d"),
@@ -19879,6 +19939,12 @@ virDomainDefFormatInternal(virDomainDefPtr def,
         xmlIndentTreeOutput = oldIndentTreeOutput;
     }
 
+    if (def->mem.max_memory) {
+        virBufferAsprintf(buf,
+                          "<maxMemory slots='%u' unit='KiB'>%llu</maxMemory>\n",
+                          def->mem.memory_slots, def->mem.max_memory);
+    }
+
     virBufferAddLit(buf, "<memory");
     if (def->mem.dump_core)
         virBufferAsprintf(buf, " dumpCore='%s'",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 9d314fa0c0b4598282a48c39d849eb0f73dbe867..bae9617f9baac04b740174ae23161b45720ba455 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2041,6 +2041,10 @@ struct _virDomainMemtune {
     virDomainHugePagePtr hugepages;
     size_t nhugepages;
 
+    /* maximum supported memory for a guest, for hotplugging */
+    unsigned long long max_memory; /* in kibibytes */
+    unsigned int memory_slots; /* maximum count of RAM memory slots */
+
     bool nosharepages;
     bool locked;
     int dump_core; /* enum virTristateSwitch */
@@ -2336,6 +2340,9 @@ virDomainObjPtr virDomainObjListFindByName(virDomainObjListPtr doms,
 bool virDomainObjTaint(virDomainObjPtr obj,
                        virDomainTaintFlags taint);
 
+
+int virDomainDefCheckUnsupportedMemoryHotplug(virDomainDefPtr def);
+
 void virDomainPanicDefFree(virDomainPanicDefPtr panic);
 void virDomainResourceDefFree(virDomainResourceDefPtr resource);
 void virDomainGraphicsDefFree(virDomainGraphicsDefPtr def);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8141eba983d43a3467833bdc1d7df4068b26b4bd..9682589dcfff4006a12f18bedf6d22c40fc1f36d 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -187,6 +187,7 @@ virDomainCpuPlacementModeTypeFromString;
 virDomainCpuPlacementModeTypeToString;
 virDomainDefAddImplicitControllers;
 virDomainDefCheckABIStability;
+virDomainDefCheckUnsupportedMemoryHotplug;
 virDomainDefClearCCWAddresses;
 virDomainDefClearDeviceAliases;
 virDomainDefClearPCIAddresses;
diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 611ccf4214ba67dd7620b3a31ecf7c1970eb56b6..3843ae04deac74201006962f3968f53a8e91bdb9 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -567,6 +567,11 @@ libxlDomainDefPostParse(virDomainDefPtr def,
         def->nconsoles = 1;
         def->consoles[0] = chrdef;
     }
+
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/lxc/lxc_domain.c b/src/lxc/lxc_domain.c
index 55f5b49bb6decd5b4245c3ca30583fd25838638a..1367b0cf27483c6aef4cefa8a561807443b25c5c 100644
--- a/src/lxc/lxc_domain.c
+++ b/src/lxc/lxc_domain.c
@@ -94,6 +94,10 @@ virLXCDomainDefPostParse(virDomainDefPtr def,
         !(def->emulator = virDomainDefGetDefaultEmulator(def, caps)))
         return -1;
 
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/openvz/openvz_driver.c b/src/openvz/openvz_driver.c
index 71b0471e12e5adbae80209179ef953ce51e2e273..055670a55fa9cf6a38be72eb8e181cc8d04a72cf 100644
--- a/src/openvz/openvz_driver.c
+++ b/src/openvz/openvz_driver.c
@@ -96,8 +96,15 @@ openvzDomainDefPostParse(virDomainDefPtr def,
                          void *opaque ATTRIBUTE_UNUSED)
 {
     /* fill the init path */
-    if (STREQ(def->os.type, "exe") && !def->os.init)
-        return VIR_STRDUP(def->os.init, "/sbin/init") < 0 ? -1 : 0;
+    if (STREQ(def->os.type, "exe") && !def->os.init) {
+        if (VIR_STRDUP(def->os.init, "/sbin/init") < 0)
+            return -1;
+    }
+
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/parallels/parallels_driver.c b/src/parallels/parallels_driver.c
index 2a6a7c9b420a67cbdd9c9b28cdb241528b8b3ae3..f5e58a8fefbf6c2c1854ad5f18c1e181fed2482f 100644
--- a/src/parallels/parallels_driver.c
+++ b/src/parallels/parallels_driver.c
@@ -161,10 +161,14 @@ parallelsConnectGetCapabilities(virConnectPtr conn)
 }
 
 static int
-parallelsDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+parallelsDomainDefPostParse(virDomainDefPtr def,
                             virCapsPtr caps ATTRIBUTE_UNUSED,
                             void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/phyp/phyp_driver.c b/src/phyp/phyp_driver.c
index 60a47ad22a799fc8e1ac6bd11c3b016e3aa90702..f4db2e0256ceac897a4fac7136ef2d2d92771701 100644
--- a/src/phyp/phyp_driver.c
+++ b/src/phyp/phyp_driver.c
@@ -1094,10 +1094,14 @@ openSSHSession(virConnectPtr conn, virConnectAuthPtr auth,
 
 
 static int
-phypDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+phypDomainDefPostParse(virDomainDefPtr def,
                        virCapsPtr caps ATTRIBUTE_UNUSED,
                        void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 949bf8b052ead7c7c02d413eb55f9c35d2b77003..8baa0402be1f42e74c116738fa23b89c7ba7e919 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1052,6 +1052,10 @@ qemuDomainDefPostParse(virDomainDefPtr def,
                                   VIR_DOMAIN_INPUT_BUS_USB) < 0)
         return -1;
 
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 27731f20bcf185f6e19c62dc2ff421d8673462c6..bdfc12e8e777382431e9848df657459f603fdf5b 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -444,10 +444,14 @@ umlDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
 
 
 static int
-umlDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+umlDomainDefPostParse(virDomainDefPtr def,
                       virCapsPtr caps ATTRIBUTE_UNUSED,
                       void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/vbox/vbox_common.c b/src/vbox/vbox_common.c
index 20211b21f14c3481ffaf73d20dc74a38a0b7422d..bb4de153ca68b41b905d0f70f19d45f039724aaf 100644
--- a/src/vbox/vbox_common.c
+++ b/src/vbox/vbox_common.c
@@ -249,10 +249,14 @@ static char *vboxGenerateMediumName(PRUint32  storageBus,
 }
 
 static int
-vboxDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vboxDomainDefPostParse(virDomainDefPtr def,
                        virCapsPtr caps ATTRIBUTE_UNUSED,
                        void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/vmware/vmware_driver.c b/src/vmware/vmware_driver.c
index 36f992b98321ca8f93275644992e4d490cd8814c..33829947b65c56e68451bb23e2509fcbbb650331 100644
--- a/src/vmware/vmware_driver.c
+++ b/src/vmware/vmware_driver.c
@@ -83,10 +83,14 @@ vmwareDataFreeFunc(void *data)
 }
 
 static int
-vmwareDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vmwareDomainDefPostParse(virDomainDefPtr def,
                          virCapsPtr caps ATTRIBUTE_UNUSED,
                          void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/vmx/vmx.c b/src/vmx/vmx.c
index 8cbf4d84f9f1421c19554e5569c0a8800da05108..8b814367b49d2dcdf003a4a00db864225bc03a13 100644
--- a/src/vmx/vmx.c
+++ b/src/vmx/vmx.c
@@ -524,10 +524,14 @@ VIR_ENUM_IMPL(virVMXControllerModelSCSI, VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST,
  * Helpers
  */
 static int
-vmxDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vmxDomainDefPostParse(virDomainDefPtr def,
                       virCapsPtr caps ATTRIBUTE_UNUSED,
                       void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/xen/xen_driver.c b/src/xen/xen_driver.c
index 75778812f12d613236c26909f8ea377658f23829..b1042439052275c0ed6c2dd61c04001c7c68c909 100644
--- a/src/xen/xen_driver.c
+++ b/src/xen/xen_driver.c
@@ -388,6 +388,10 @@ xenDomainDefPostParse(virDomainDefPtr def,
         def->memballoon = memballoon;
     }
 
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/src/xenapi/xenapi_driver.c b/src/xenapi/xenapi_driver.c
index affc153bb7f73ccd9ac908800f187f6645ee4443..31344414d957f036a33babe66e97cd9d9a25686a 100644
--- a/src/xenapi/xenapi_driver.c
+++ b/src/xenapi/xenapi_driver.c
@@ -70,10 +70,14 @@ xenapiDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
 
 
 static int
-xenapiDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+xenapiDomainDefPostParse(virDomainDefPtr def,
                          virCapsPtr caps ATTRIBUTE_UNUSED,
                          void *opaque ATTRIBUTE_UNUSED)
 {
+    /* memory hotplug tunables are not supported by this driver */
+    if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+        return -1;
+
     return 0;
 }
 
diff --git a/tests/domainschemadata/maxMemory.xml b/tests/domainschemadata/maxMemory.xml
new file mode 100644
index 0000000000000000000000000000000000000000..df2e3d8e427b7dd84d73b85bb8684c4c42587d8a
--- /dev/null
+++ b/tests/domainschemadata/maxMemory.xml
@@ -0,0 +1,19 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <maxMemory slots='9' unit='KiB'>1233456789</maxMemory>
+  <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>
+  </devices>
+</domain>