s390/protvirt: block kernel command line alteration

Disallow kernel command line alteration via ipl parameter block if
running in protected virtualization environment.

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

diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index 385d0c7a96352a5e7e6fe7c9b435044bc358a2b4..1900670a83fdcba241f4a3ef41f4c1c4100a238a 100644 (file)
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -144,7 +144,7 @@ void setup_boot_command_line(void)
        strcpy(early_command_line, strim(COMMAND_LINE));
 
        /* append IPL PARM data to the boot command line */
-       if (ipl_block_valid)
+       if (!is_prot_virt_guest() && ipl_block_valid)
                append_ipl_block_parm();
 }