diff --git a/drivers/infiniband/hw/ehca/hcp_phyp.c b/drivers/infiniband/hw/ehca/hcp_phyp.c
index 0b1a477..6237252 100644
--- a/drivers/infiniband/hw/ehca/hcp_phyp.c
+++ b/drivers/infiniband/hw/ehca/hcp_phyp.c
@@ -44,13 +44,14 @@ #include "hipz_hw.h"
 
 int hcall_map_page(u64 physaddr, u64 *mapaddr)
 {
-	*mapaddr = (u64)(ioremap(physaddr, EHCA_PAGESIZE));
+	*mapaddr = (u64)ioremap((physaddr & PAGE_MASK), PAGE_SIZE) +
+		(physaddr & (~PAGE_MASK));
 	return 0;
 }
 
 int hcall_unmap_page(u64 mapaddr)
 {
-	iounmap((volatile void __iomem*)mapaddr);
+	iounmap((void __iomem*)(mapaddr & PAGE_MASK));
 	return 0;
 }