diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 3d9bc7d7c0c4..a24d8678e8dc 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2269,6 +2269,18 @@ static int cxl_region_detach(struct cxl_endpoint_decoder *cxled)
 	return rc;
 }
 
+int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled)
+{
+	int rc;
+
+	down_write(&cxl_region_rwsem);
+	cxled->mode = CXL_DECODER_DEAD;
+	rc = cxl_region_detach(cxled);
+	up_write(&cxl_region_rwsem);
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_accel_region_detach, "CXL");
+
 void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled)
 {
 	down_write(&cxl_region_rwsem);
@@ -2775,6 +2787,14 @@ cxl_find_region_by_name(struct cxl_root_decoder *cxlrd, const char *name)
 	return to_cxl_region(region_dev);
 }
 
+static void drop_region(struct cxl_region *cxlr)
+{
+	struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(cxlr->dev.parent);
+	struct cxl_port *port = cxlrd_to_port(cxlrd);
+
+	devm_release_action(port->uport_dev, unregister_region, cxlr);
+}
+
 static ssize_t delete_region_store(struct device *dev,
 				   struct device_attribute *attr,
 				   const char *buf, size_t len)
@@ -3381,17 +3401,18 @@ static int match_region_by_range(struct device *dev, void *data)
 	return rc;
 }
 
-/* Establish an empty region covering the given HPA range */
-static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
-					   struct cxl_endpoint_decoder *cxled)
+static void construct_region_end(void)
+{
+	up_write(&cxl_region_rwsem);
+}
+
+static struct cxl_region *construct_region_begin(struct cxl_root_decoder *cxlrd,
+						 struct cxl_endpoint_decoder *cxled)
 {
 	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
-	struct cxl_port *port = cxlrd_to_port(cxlrd);
-	struct range *hpa = &cxled->cxld.hpa_range;
 	struct cxl_region_params *p;
 	struct cxl_region *cxlr;
-	struct resource *res;
-	int rc;
+	int err;
 
 	do {
 		cxlr = __create_region(cxlrd, cxled->mode,
@@ -3400,8 +3421,7 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
 	} while (IS_ERR(cxlr) && PTR_ERR(cxlr) == -EBUSY);
 
 	if (IS_ERR(cxlr)) {
-		dev_err(cxlmd->dev.parent,
-			"%s:%s: %s failed assign region: %ld\n",
+		dev_err(cxlmd->dev.parent, "%s:%s: %s failed assign region: %ld\n",
 			dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev),
 			__func__, PTR_ERR(cxlr));
 		return cxlr;
@@ -3411,13 +3431,33 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
 	p = &cxlr->params;
 	if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE) {
 		dev_err(cxlmd->dev.parent,
-			"%s:%s: %s autodiscovery interrupted\n",
+			"%s:%s: %s region setup interrupted\n",
 			dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev),
 			__func__);
-		rc = -EBUSY;
-		goto err;
+		err = -EBUSY;
+		construct_region_end();
+		drop_region(cxlr);
+		return ERR_PTR(err);
 	}
 
+	return cxlr;
+}
+
+/* Establish an empty region covering the given HPA range */
+static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
+					   struct cxl_endpoint_decoder *cxled)
+{
+	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
+	struct range *hpa = &cxled->cxld.hpa_range;
+	struct cxl_region_params *p;
+	struct cxl_region *cxlr;
+	struct resource *res;
+	int rc;
+
+	cxlr = construct_region_begin(cxlrd, cxled);
+	if (IS_ERR(cxlr))
+		return cxlr;
+
 	set_bit(CXL_REGION_F_AUTO, &cxlr->flags);
 
 	res = kmalloc(sizeof(*res), GFP_KERNEL);
@@ -3440,6 +3480,7 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
 			 __func__, dev_name(&cxlr->dev));
 	}
 
+	p = &cxlr->params;
 	p->res = res;
 	p->interleave_ways = cxled->cxld.interleave_ways;
 	p->interleave_granularity = cxled->cxld.interleave_granularity;
@@ -3456,16 +3497,91 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
 
 	/* ...to match put_device() in cxl_add_to_region() */
 	get_device(&cxlr->dev);
-	up_write(&cxl_region_rwsem);
-
+	construct_region_end();
 	return cxlr;
 
 err:
-	up_write(&cxl_region_rwsem);
-	devm_release_action(port->uport_dev, unregister_region, cxlr);
+	construct_region_end();
+	drop_region(cxlr);
 	return ERR_PTR(rc);
 }
 
+static struct cxl_region *
+__construct_new_region(struct cxl_root_decoder *cxlrd,
+		       struct cxl_endpoint_decoder *cxled)
+{
+	struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld;
+	struct cxl_region_params *p;
+	struct cxl_region *cxlr;
+	int rc;
+
+	cxlr = construct_region_begin(cxlrd, cxled);
+	if (IS_ERR(cxlr))
+		return cxlr;
+
+	rc = set_interleave_ways(cxlr, 1);
+	if (rc)
+		goto err;
+
+	rc = set_interleave_granularity(cxlr, cxld->interleave_granularity);
+	if (rc)
+		goto err;
+
+	rc = alloc_hpa(cxlr, resource_size(cxled->dpa_res));
+	if (rc)
+		goto err;
+
+	down_read(&cxl_dpa_rwsem);
+	rc = cxl_region_attach(cxlr, cxled, 0);
+	up_read(&cxl_dpa_rwsem);
+
+	if (rc)
+		goto err;
+
+	rc = cxl_region_decode_commit(cxlr);
+	if (rc)
+		goto err;
+
+	p = &cxlr->params;
+	p->state = CXL_CONFIG_COMMIT;
+
+	construct_region_end();
+	return cxlr;
+err:
+	construct_region_end();
+	drop_region(cxlr);
+	return ERR_PTR(rc);
+}
+
+/**
+ * cxl_create_region - Establish a region given an endpoint decoder
+ * @cxlrd: root decoder to allocate HPA
+ * @cxled: endpoint decoder with reserved DPA capacity
+ *
+ * Returns a fully formed region in the commit state and attached to the
+ * cxl_region driver.
+ */
+struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
+				     struct cxl_endpoint_decoder *cxled)
+{
+	struct cxl_region *cxlr;
+
+	mutex_lock(&cxlrd->range_lock);
+	cxlr = __construct_new_region(cxlrd, cxled);
+	mutex_unlock(&cxlrd->range_lock);
+
+	if (IS_ERR(cxlr))
+		return cxlr;
+
+	if (device_attach(&cxlr->dev) <= 0) {
+		dev_err(&cxlr->dev, "failed to create region\n");
+		drop_region(cxlr);
+		return ERR_PTR(-ENODEV);
+	}
+	return cxlr;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_create_region, "CXL");
+
 int cxl_add_to_region(struct cxl_port *root, struct cxl_endpoint_decoder *cxled)
 {
 	struct cxl_memdev *cxlmd = cxled_to_memdev(cxled);
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 4c1c53c29544..9d874f1cb3bf 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -874,4 +874,6 @@ struct cxl_hdm {
 struct seq_file;
 struct dentry *cxl_debugfs_create_dir(const char *dir);
 void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds);
+struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
+				     struct cxl_endpoint_decoder *cxled);
 #endif /* __CXL_MEM_H__ */
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index 4c83f6a22e58..4bb89b81223c 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -33,6 +33,7 @@ static void schedule_detach(void *cxlmd)
 static int discover_region(struct device *dev, void *root)
 {
 	struct cxl_endpoint_decoder *cxled;
+	struct cxl_memdev *cxlmd;
 	int rc;
 
 	if (!is_endpoint_decoder(dev))
@@ -42,7 +43,9 @@ static int discover_region(struct device *dev, void *root)
 	if ((cxled->cxld.flags & CXL_DECODER_F_ENABLE) == 0)
 		return 0;
 
-	if (cxled->state != CXL_DECODER_STATE_AUTO)
+	cxlmd = cxled_to_memdev(cxled);
+	if (cxled->state != CXL_DECODER_STATE_AUTO ||
+	    cxlmd->cxlds->type == CXL_DEVTYPE_DEVMEM)
 		return 0;
 
 	/*
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
index c450dc09a2c6..e0ea5b801a2e 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -60,4 +60,8 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd,
 					     resource_size_t min,
 					     resource_size_t max);
 int cxl_dpa_free(struct cxl_endpoint_decoder *cxled);
+struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
+				     struct cxl_endpoint_decoder *cxled);
+
+int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled);
 #endif
