diff --git a/configure b/configure
index 1043ccce4f..b0b1a1cc25 100755
--- a/configure
+++ b/configure
@@ -2094,8 +2094,8 @@ cat > $TMPC << EOF
 #  endif
 # endif
 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
-# if __GNUC__ < 7 || (__GNUC__ == 7 && __GNUC_MINOR__ < 5)
-#  error You need at least GCC v7.5.0 to compile QEMU
+# if __GNUC__ < 7 || (__GNUC__ == 7 && __GNUC_MINOR__ < 4)
+#  error You need at least GCC v7.4.0 to compile QEMU
 # endif
 #else
 # error You either need GCC or Clang to compiler QEMU
@@ -2103,7 +2103,7 @@ cat > $TMPC << EOF
 int main (void) { return 0; }
 EOF
 if ! compile_prog "" "" ; then
-    error_exit "You need at least GCC v7.5 or Clang v6.0 (or XCode Clang v10.0)"
+    error_exit "You need at least GCC v7.4 or Clang v6.0 (or XCode Clang v10.0)"
 fi
 
 # Accumulate -Wfoo and -Wno-bar separately.
diff --git a/hw/tpm/tpm_ppi.c b/hw/tpm/tpm_ppi.c
index 362edcc5c9..274e9aa4b0 100644
--- a/hw/tpm/tpm_ppi.c
+++ b/hw/tpm/tpm_ppi.c
@@ -30,11 +30,14 @@ void tpm_ppi_reset(TPMPPI *tpmppi)
         guest_phys_blocks_init(&guest_phys_blocks);
         guest_phys_blocks_append(&guest_phys_blocks);
         QTAILQ_FOREACH(block, &guest_phys_blocks.head, next) {
+            hwaddr mr_offs = block->host_addr -
+                             (uint8_t *)memory_region_get_ram_ptr(block->mr);
+
             trace_tpm_ppi_memset(block->host_addr,
                                  block->target_end - block->target_start);
             memset(block->host_addr, 0,
                    block->target_end - block->target_start);
-            memory_region_set_dirty(block->mr, 0,
+            memory_region_set_dirty(block->mr, mr_offs,
                                     block->target_end - block->target_start);
         }
         guest_phys_blocks_free(&guest_phys_blocks);
diff --git a/hw/virtio/virtio-mem-pci.c b/hw/virtio/virtio-mem-pci.c
index fa5395cd88..be2383b0c5 100644
--- a/hw/virtio/virtio-mem-pci.c
+++ b/hw/virtio/virtio-mem-pci.c
@@ -87,14 +87,12 @@ static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
     VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
                                          size_change_notifier);
     DeviceState *dev = DEVICE(pci_mem);
+    char *qom_path = object_get_canonical_path(OBJECT(dev));
     const uint64_t * const size_p = data;
-    const char *id = NULL;
 
-    if (dev->id) {
-        id = g_strdup(dev->id);
-    }
-
-    qapi_event_send_memory_device_size_change(!!id, id, *size_p);
+    qapi_event_send_memory_device_size_change(!!dev->id, dev->id, *size_p,
+                                              qom_path);
+    g_free(qom_path);
 }
 
 static void virtio_mem_pci_class_init(ObjectClass *klass, void *data)
diff --git a/monitor/monitor.c b/monitor/monitor.c
index 46a171bca6..21c7a68758 100644
--- a/monitor/monitor.c
+++ b/monitor/monitor.c
@@ -474,6 +474,10 @@ static unsigned int qapi_event_throttle_hash(const void *key)
         hash += g_str_hash(qdict_get_str(evstate->data, "node-name"));
     }
 
+    if (evstate->event == QAPI_EVENT_MEMORY_DEVICE_SIZE_CHANGE) {
+        hash += g_str_hash(qdict_get_str(evstate->data, "qom-path"));
+    }
+
     return hash;
 }
 
@@ -496,6 +500,11 @@ static gboolean qapi_event_throttle_equal(const void *a, const void *b)
                        qdict_get_str(evb->data, "node-name"));
     }
 
+    if (eva->event == QAPI_EVENT_MEMORY_DEVICE_SIZE_CHANGE) {
+        return !strcmp(qdict_get_str(eva->data, "qom-path"),
+                       qdict_get_str(evb->data, "qom-path"));
+    }
+
     return TRUE;
 }
 
diff --git a/qapi/machine.json b/qapi/machine.json
index 0e91a57a76..5db54df298 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1336,8 +1336,11 @@
 # action).
 #
 # @id: device's ID
+#
 # @size: the new size of memory that the device provides
 #
+# @qom-path: path to the device object in the QOM tree (since 6.2)
+#
 # Note: this event is rate-limited.
 #
 # Since: 5.1
@@ -1350,7 +1353,7 @@
 #
 ##
 { 'event': 'MEMORY_DEVICE_SIZE_CHANGE',
-  'data': { '*id': 'str', 'size': 'size' } }
+  'data': { '*id': 'str', 'size': 'size', 'qom-path' : 'str'} }
 
 
 ##
diff --git a/softmmu/memory_mapping.c b/softmmu/memory_mapping.c
index e7af276546..a62eaa49cc 100644
--- a/softmmu/memory_mapping.c
+++ b/softmmu/memory_mapping.c
@@ -193,29 +193,14 @@ typedef struct GuestPhysListener {
     MemoryListener listener;
 } GuestPhysListener;
 
-static void guest_phys_blocks_region_add(MemoryListener *listener,
+static void guest_phys_block_add_section(GuestPhysListener *g,
                                          MemoryRegionSection *section)
 {
-    GuestPhysListener *g;
-    uint64_t section_size;
-    hwaddr target_start, target_end;
-    uint8_t *host_addr;
-    GuestPhysBlock *predecessor;
-
-    /* we only care about RAM */
-    if (!memory_region_is_ram(section->mr) ||
-        memory_region_is_ram_device(section->mr) ||
-        memory_region_is_nonvolatile(section->mr)) {
-        return;
-    }
-
-    g            = container_of(listener, GuestPhysListener, listener);
-    section_size = int128_get64(section->size);
-    target_start = section->offset_within_address_space;
-    target_end   = target_start + section_size;
-    host_addr    = memory_region_get_ram_ptr(section->mr) +
-                   section->offset_within_region;
-    predecessor  = NULL;
+    const hwaddr target_start = section->offset_within_address_space;
+    const hwaddr target_end = target_start + int128_get64(section->size);
+    uint8_t *host_addr = memory_region_get_ram_ptr(section->mr) +
+                         section->offset_within_region;
+    GuestPhysBlock *predecessor = NULL;
 
     /* find continuity in guest physical address space */
     if (!QTAILQ_EMPTY(&g->list->head)) {
@@ -229,7 +214,8 @@ static void guest_phys_blocks_region_add(MemoryListener *listener,
 
         /* we want continuity in both guest-physical and host-virtual memory */
         if (predecessor->target_end < target_start ||
-            predecessor->host_addr + predecessor_size != host_addr) {
+            predecessor->host_addr + predecessor_size != host_addr ||
+            predecessor->mr != section->mr) {
             predecessor = NULL;
         }
     }
@@ -260,6 +246,40 @@ static void guest_phys_blocks_region_add(MemoryListener *listener,
 #endif
 }
 
+static int guest_phys_ram_populate_cb(MemoryRegionSection *section,
+                                      void *opaque)
+{
+    GuestPhysListener *g = opaque;
+
+    guest_phys_block_add_section(g, section);
+    return 0;
+}
+
+static void guest_phys_blocks_region_add(MemoryListener *listener,
+                                         MemoryRegionSection *section)
+{
+    GuestPhysListener *g = container_of(listener, GuestPhysListener, listener);
+
+    /* we only care about RAM */
+    if (!memory_region_is_ram(section->mr) ||
+        memory_region_is_ram_device(section->mr) ||
+        memory_region_is_nonvolatile(section->mr)) {
+        return;
+    }
+
+    /* for special sparse regions, only add populated parts */
+    if (memory_region_has_ram_discard_manager(section->mr)) {
+        RamDiscardManager *rdm;
+
+        rdm = memory_region_get_ram_discard_manager(section->mr);
+        ram_discard_manager_replay_populated(rdm, section,
+                                             guest_phys_ram_populate_cb, g);
+        return;
+    }
+
+    guest_phys_block_add_section(g, section);
+}
+
 void guest_phys_blocks_append(GuestPhysBlockList *list)
 {
     GuestPhysListener g = { 0 };