From: Nicolin Chen <redacted>
Sent: Saturday, June 14, 2025 3:15 PM
+
+	offset =
+		cmd->nesting_parent_iova - PAGE_ALIGN(cmd-

quoted

nesting_parent_iova);

+	max_npages = DIV_ROUND_UP(offset + cmd->length, PAGE_SIZE);
+
+	/*
+	 * FIXME allocation may fail when sizeof(*pages) * max_npages is
+	 * larger than PAGE_SIZE. This might need a new API returning a
+	 * bio_vec or something more efficient.
+	 */
+	pages = kcalloc(max_npages, sizeof(*pages), GFP_KERNEL);
+	if (!pages)
+		return ERR_PTR(-ENOMEM);
+

any allocation may fail... can you elaborate more here? How does
PAGE_SIZE become a boundary?