Drivers: hv: balloon: Fix info request to show max page count

Balloon driver was only printing the size of the info blob and not the
actual content. This fixes it so that the info blob (max page count as
configured in Hyper-V) is printed out.
Signed-off-by: NAlex Ng <alexng@microsoft.com>
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/hv_balloon.c

@@ -1034,8 +1034,13 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
 
 	switch (info_hdr->type) {
 	case INFO_TYPE_MAX_PAGE_CNT:
-		pr_info("Received INFO_TYPE_MAX_PAGE_CNT\n");
-		pr_info("Data Size is %d\n", info_hdr->data_size);
+		if (info_hdr->data_size == sizeof(__u64)) {
+			__u64 *max_page_count = (__u64 *)&info_hdr[1];
+
+			pr_info("INFO_TYPE_MAX_PAGE_CNT = %llu\n",
+				*max_page_count);
+		}
+
 		break;
 	default:
 		pr_info("Received Unknown type: %d\n", info_hdr->type);