diff --git a/core/modules/block/block.install b/core/modules/block/block.install
index b1fc925..67114b5 100644
--- a/core/modules/block/block.install
+++ b/core/modules/block/block.install
@@ -49,6 +49,70 @@ function block_update_dependencies() {
 }
 
 /**
+ * Utility function: return an array map of Drupal 7 block to Drupal 8 blocks.
+ * This is ugly and hard-coded. Kill @mradcliffe.
+ *
+ * @return
+ *   An associative array of Drupal 7 blocks keyed by the module name with
+ *   Drupal 8 block plugin information.
+ *
+ * @ingroup update_api
+ */
+function _update_8009_get_block_info() {
+  $info = array(
+    'book' => array(
+      'navigation' => array(
+        'plugin' => 'book_navigation',
+      ),
+    ),
+    'comment' => array(
+      'recent' => array(
+        'plugin' => 'recent_comments',
+      ),
+    ),
+    'shortcut' => array(
+      'shortcuts' => array(
+         'plugin' => 'shortcuts',
+      ),
+    ),
+    'system' => array(
+      'main' => array(
+        'plugin' => 'system_main_block',
+      ),
+      'help' => array(
+        'plugin' => 'system_help_block',
+      ),
+      'powered-by' => array(
+        'plugin' => 'system_powered_by_block',
+      ),
+      'navigation' => array(
+        'plugin' => 'system_menu_block:menu-tools',
+      ),
+      'management' => array(
+        'plugin' => 'system_menu_block:menu-admin',
+      ),
+      'user-menu' => array(
+        'plugin' => 'system_menu_block:menu-account',
+      ),
+      'main-menu' => array(
+        'plugin' => 'system_menu_block:menu-main',
+      ),
+    ),
+  );
+
+/*
+  $menus = menu_get_menus(FALSE);
+  foreach ($menus as $menu_name => $label) {
+    $info['menu'][$menu_name] = array(
+      'plugin' => 'menu_menu_block:menu-' . $menu_name,
+    );
+  }
+ */
+ 
+  return $info;
+}
+
+/**
  * Block cache is always enabled in 8.x.
  *
  * @ingroup config_upgrade
@@ -336,6 +400,99 @@ function block_update_8008() {
 }
 
 /**
+ * Migrate {block} records to configuration instances.
+ */
+function block_update_8009() {
+  $sandbox['#finished'] = 0;
+
+  if (!isset($sandbox['total'])) {
+    // Initial invocation.
+
+    $sandbox['last'] = 0;
+    $sandbox['count'] = 0;
+
+    $query = db_select('block', 'b');
+    $sandbox['total'] = $query
+      ->condition('b.module', array('block', 'profile', 'blog', 'poll', 'locale', 'language'), 'NOT IN')
+      ->countQuery()
+      ->execute()
+      ->fetchField();
+  }
+
+  // Subsequent invocations.
+
+  $found = FALSE;
+  if ($sandbox['total']) {
+    // Operate on each block in turn.
+
+    $block_info = _update_8009_get_block_info();
+
+    $batch_size = 200;
+    $query = db_select('block', 'b');
+    $query
+      ->fields('b')
+      ->condition('b.module', array('block', 'profile', 'blog', 'poll', 'locale', 'language'), 'NOT IN')
+      ->condition('b.bid', $sandbox['last'], '>')
+      ->orderBy('b.bid', 'ASC')
+      ->range(0, $batch_size);
+    $blocks = $query->execute();
+
+    foreach ($blocks as $block) {
+      // Try to match a plugin to block.
+      $plugin_id = '';
+      $found = TRUE;
+
+      if (isset($block_info[$block->module])) {
+        // Block plugin id is not consistent with Drupal 7 block delta.
+
+        foreach (array_keys($block_info[$block->module]) as $key) {
+          if ($key == $block->delta) {
+            $plugin_id = $block_info[$block->module][$key]['plugin'];
+            $settings = isset($block_info[$block->module][$key]['settings']) ? $block_info[$block->module][$key]['settings'] : array();
+            break;
+          }
+        }
+
+        if (empty($plugin_id)) {
+          $sandbox['count'] += 1;
+          $sandbox['last'] = $block->bid;
+          continue;
+        }
+      }
+      else {
+        // Fallback to consistent block plugin id: module, delta, block.
+        $plugin_id = $block->module . '_' . str_replace('-', '_', $block->delta) . '_block';
+        $settings = array();
+      }
+
+      // @todo visibility
+      // Create the block configuration entity instance.
+      $id = $block->theme . '.' . $block->module . '.' . str_replace('-', '_', $block->delta);
+      $entity = config('block.block.' . $id);
+      $entity
+        ->set('id', $id)
+        ->set('plugin', $plugin_id)
+        ->set('theme', $block->theme)
+        ->set('region', $block->region)
+        ->set('weight', $block->weight)
+        ->set('status', $block->status)
+        ->set('settings', $settings);
+      $entity->save();
+
+      $sandbox['count'] += 1;
+      $sandbox['last'] = $block->bid;
+    }
+
+    $sandbox['#finished'] = min(0.99, $sandbox['count'] / $sandbox['total']);
+
+    if (!$found) {
+      // We're done.
+      $sandbox['#finished'] = 1;
+    }
+  }
+}
+
+/**
  * @} End of "addtogroup updates-7.x-to-8.x".
  * The next series of updates should start at 9000.
  */
diff --git a/core/modules/system/lib/Drupal/system/Tests/Upgrade/BlockUpgradePathTest.php b/core/modules/system/lib/Drupal/system/Tests/Upgrade/BlockUpgradePathTest.php
index b9129e3..d48fa05 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Upgrade/BlockUpgradePathTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Upgrade/BlockUpgradePathTest.php
@@ -8,9 +8,10 @@
 namespace Drupal\system\Tests\Upgrade;
 
 /**
- * Tests upgrading a bare database.
+ * Tests upgrading a filled database with blocks.
  *
- * Loads a bare installation of Drupal 7 and runs the upgrade process on it.
+ * Loads a standard installation of Drupal 7 and runs the upgrade process on
+ * it.
  */
 class BlockUpgradePathTest extends UpgradePathTestBase {
 
@@ -24,7 +25,7 @@ public static function getInfo() {
 
   public function setUp() {
     $this->databaseDumpFiles = array(
-      drupal_get_path('module', 'system') . '/tests/upgrade/drupal-7.bare.minimal.database.php.gz',
+      drupal_get_path('module', 'system') . '/tests/upgrade/drupal-7.filled.standard_all.database.php.gz',
     );
     parent::setUp();
   }
@@ -39,6 +40,9 @@ public function testBlockUpgradeTitleLength() {
     // output validation errors or success messages, so create the blocks from
     // the UI.
 
+    $this->drupalGet('admin/structure/block');
+    $this->drupalGet('admin/structure/block/list/block_plugin_ui:seven');
+
     // Add a block instance with a 255-character title.
     // Confirm that the custom block has been created, and title matches input.
     $settings = array(