Hi Dave, On s390 the new zEC12 machines support 2GB frames. In order to walk page tables correctly add support to the page table walker function so it detects 2GB frames. Michael Signed-off-by: Heiko Carstens <heiko.carstens(a)de.ibm.com&gt; Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- s390x.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/s390x.c +++ b/s390x.c @@ -643,6 +643,13 @@ int s390x_vtop(ulong table, ulong vaddr, if (!entry) return FALSE; table = entry & ~0xfffULL; + /* Check if this a 2GB page */ + if ((entry & 0x400ULL) && (level == 1)) { + /* Add the 2GB frame offset & return the final value. */ + table &= ~0x7fffffffULL; + *phys_addr = table + (vaddr & 0x7fffffffULL); + return TRUE; + } len = entry & 0x3ULL; level--; } @@ -650,6 +657,7 @@ int s390x_vtop(ulong table, ulong vaddr, /* Check if this is a large page. */ if (entry & 0x400ULL) { /* Add the 1MB page offset and return the final value. */ + table &= ~0xfffffULL; *phys_addr = table + (vaddr & 0xfffffULL); return TRUE; }