[PATCH for-4.14] xen/hypfs: fix loglvl parameter setting

[Juergen Gross <jgross@xxxxxxxx>]

Writing the runtime parameters loglvl or guest_loglvl omits setting the
new length of the resulting parameter value.

Reported-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/drivers/char/console.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index 56e24821b2..861ad53a8f 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -241,14 +241,25 @@ static int _parse_loglvl(const char *s, int *lower, int 
*upper, char *val)
 
 static int parse_loglvl(const char *s)
 {
-    return _parse_loglvl(s, &xenlog_lower_thresh, &xenlog_upper_thresh,
-                         xenlog_val);
+    int ret;
+
+    ret = _parse_loglvl(s, &xenlog_lower_thresh, &xenlog_upper_thresh,
+                        xenlog_val);
+    custom_runtime_set_var(param_2_parfs(parse_loglvl), xenlog_val);
+
+    return ret;
 }
 
 static int parse_guest_loglvl(const char *s)
 {
-    return _parse_loglvl(s, &xenlog_guest_lower_thresh,
-                         &xenlog_guest_upper_thresh, xenlog_guest_val);
+    int ret;
+
+    ret = _parse_loglvl(s, &xenlog_guest_lower_thresh,
+                        &xenlog_guest_upper_thresh, xenlog_guest_val);
+    custom_runtime_set_var(param_2_parfs(parse_guest_loglvl),
+                           xenlog_guest_val);
+
+    return ret;
 }
 
 static char *loglvl_str(int lvl)
-- 
2.26.2