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 385d0c7..1900670 100644
--- 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();
}