s390: provide I/O subsystem reset

Provide a function that resets the I/O subsystem.

Signed-off-by: Christian Borntraeger <[email protected]>
Acked-by: Alexander Graf <[email protected]>

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index aebbbf1755d989b4628cffdfa31e2b54ff0a71a0..8fd46a92c9d7d26b796d96f87a29b9c1c775ba67 100644 (file)
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -17,6 +17,21 @@
 #include "css.h"
 #include "virtio-ccw.h"
 
+void io_subsystem_reset(void)
+{
+    DeviceState *css, *sclp;
+
+    css = DEVICE(object_resolve_path_type("", "virtual-css-bridge", NULL));
+    if (css) {
+        qdev_reset_all(css);
+    }
+    sclp = DEVICE(object_resolve_path_type("",
+                  "s390-sclp-event-facility", NULL));
+    if (sclp) {
+        qdev_reset_all(sclp);
+    }
+}
+
 static int virtio_ccw_hcall_notify(const uint64_t *args)
 {
     uint64_t subch_id = args[0];

diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 0878ab667808d673b6e2ffd9fa5b78fb56262c90..af9de5ed0b90516f0e88e13b5a944ef3c2c675ee 100644 (file)
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -400,6 +400,7 @@ void cpu_unlock(void);
 typedef struct SubchDev SubchDev;
 
 #ifndef CONFIG_USER_ONLY
+extern void io_subsystem_reset(void);
 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid,
                          uint16_t schid);
 bool css_subch_visible(SubchDev *sch);