+ /*
+ * First page holds struct hv_ring_buffer, do wraparound mapping for
+ * the rest.
+ */
+ pages_wraparound = kzalloc(sizeof(struct page *) * (page_cnt * 2 - 1),
+ GFP_KERNEL);
+ if (!pages_wraparound)
+ return -ENOMEM;
+
+ pages_wraparound[0] = pages;
+ for (i = 0; i < 2 * (page_cnt - 1); i++)
+ pages_wraparound[i + 1] = &pages[i % (page_cnt - 1) + 1];
+
+ ring_info->ring_buffer = (struct hv_ring_buffer *)
+ vmap(pages_wraparound, page_cnt * 2 - 1, VM_MAP, PAGE_KERNEL);
+
+ kfree(pages_wraparound);
+
+
+ if (!ring_info->ring_buffer)
+ return -ENOMEM;
+