s390/protvirt: add memory sharing for diag 308 set/store

Add sharing of ipl parameter block for diag 308 set/store calls to allow
kvm access in protected virtualization environment.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index dc0438d08751..385d0c7a9635 100644
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -7,6 +7,7 @@
 #include <asm/sections.h>
 #include <asm/boot_data.h>
 #include <asm/facility.h>
+#include <asm/uv.h>
 #include "boot.h"
 
 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
@@ -45,7 +46,9 @@ void store_ipl_parmblock(void)
 {
         int rc;
 
+        uv_set_shared(__pa(&ipl_block));
         rc = __diag308(DIAG308_STORE, &ipl_block);
+        uv_remove_shared(__pa(&ipl_block));
         if (rc == DIAG308_RC_OK &&
             ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
                 ipl_block_valid = 1;