[S390] load user asce on sie_fault

On sie_fault we need to switch back to user ASCE. Otherwise we get
interresting effects when exiting to "userspace" while the guest
space is still active.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 8ecee2019d162435e7e6b563c9c4155611d4d8cc..d323ea3797523166fb10ceb081470fac4aa1fab0 100644 (file)
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -1093,6 +1093,7 @@ sie_exit:
        lghi    %r2,0
        br      %r14
 sie_fault:
+       lctlg   %c1,%c1,__LC_USER_ASCE          # load primary asce
        lg      %r14,__LC_THREAD_INFO           # pointer thread_info struct
        ni      __TI_flags+6(%r14),255-(_TIF_SIE>>8)
        lg      %r14,__SF_EMPTY+8(%r15)         # load guest register save area