[Qemu-devel] [PATCH 7/8] s390x/css: {c, h, t, r, x}sch: require enable AND device number valid

[Christian Borntraeger]

From: Sascha Silbe <address@hidden>

According to the PoP, subchannels are only considered operational if
they are enabled _and_ the device number is valid. With the current
checks being enabled _or_ having a valid device number was
sufficient. This caused qemu to allow IO on subchannels that were not
enabled.

Fix the checks to require both bits to be set.

Signed-off-by: Sascha Silbe <address@hidden>
Reviewed-by: Cornelia Huck <address@hidden>
Reviewed-by: Halil Pasic <address@hidden>
Signed-off-by: Christian Borntraeger <address@hidden>
---
 hw/s390x/css.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index b0e81ef..0f2580d 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -775,7 +775,7 @@ int css_do_xsch(SubchDev *sch)
     PMCW *p = &sch->curr_status.pmcw;
     int ret;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         ret = -ENODEV;
         goto out;
     }
@@ -815,7 +815,7 @@ int css_do_csch(SubchDev *sch)
     PMCW *p = &sch->curr_status.pmcw;
     int ret;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         ret = -ENODEV;
         goto out;
     }
@@ -837,7 +837,7 @@ int css_do_hsch(SubchDev *sch)
     PMCW *p = &sch->curr_status.pmcw;
     int ret;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         ret = -ENODEV;
         goto out;
     }
@@ -913,7 +913,7 @@ int css_do_ssch(SubchDev *sch, ORB *orb)
     PMCW *p = &sch->curr_status.pmcw;
     int ret;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         ret = -ENODEV;
         goto out;
     }
@@ -990,7 +990,7 @@ int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int 
*irb_len)
     uint16_t stctl;
     IRB irb;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         return 3;
     }
 
@@ -1196,7 +1196,7 @@ int css_do_rsch(SubchDev *sch)
     PMCW *p = &sch->curr_status.pmcw;
     int ret;
 
-    if (!(p->flags & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA))) {
+    if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
         ret = -ENODEV;
         goto out;
     }
-- 
2.5.5