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-rw-r--r--arch/s390/mm/cmm.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index d30cdb4248a..f5a5bc09b8f 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -20,6 +20,11 @@
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
+static char *sender = "VMRMSVM";
+module_param(sender, charp, 0);
+MODULE_PARM_DESC(sender,
+ "Guest name that may send SMSG messages (default VMRMSVM)");
+
#include "../../../drivers/s390/net/smsgiucv.h"
#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
@@ -367,10 +372,12 @@ static struct ctl_table cmm_dir_table[] = {
#ifdef CONFIG_CMM_IUCV
#define SMSG_PREFIX "CMM"
static void
-cmm_smsg_target(char *msg)
+cmm_smsg_target(char *from, char *msg)
{
long pages, seconds;
+ if (strlen(sender) > 0 && strcmp(from, sender) != 0)
+ return;
if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
return;
if (strncmp(msg, "SHRINK", 6) == 0) {