s390x/kvm: some fixes and cleanups

1. sclp: get of of duplicate defines
 2. ccw: implement and fix handling of some special cases
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Merge remote-tracking branch 'remotes/borntraeger/tags/s390x-20140923' into staging

s390x/kvm: some fixes and cleanups

1. sclp: get of of duplicate defines
2. ccw: implement and fix handling of some special cases

# gpg: Signature made Tue 23 Sep 2014 13:10:47 BST using RSA key ID B5A61C7C
# gpg: Can't check signature: public key not found

* remotes/borntraeger/tags/s390x-20140923:
  s390x/css: catch ccw sequence errors
  s390x/css: support format-0 ccws
  s390x: remove duplicate defines in SCLP code

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/s390x/css.c

@@ -243,17 +243,25 @@ static void copy_sense_id_to_guest(SenseId *dest, SenseId *src)
     }
 }
 
-static CCW1 copy_ccw_from_guest(hwaddr addr)
+static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1)
 {
-    CCW1 tmp;
+    CCW0 tmp0;
+    CCW1 tmp1;
     CCW1 ret;
 
-    cpu_physical_memory_read(addr, &tmp, sizeof(tmp));
+    if (fmt1) {
-    ret.cmd_code = tmp.cmd_code;
+        cpu_physical_memory_read(addr, &tmp1, sizeof(tmp1));
-    ret.flags = tmp.flags;
+        ret.cmd_code = tmp1.cmd_code;
-    ret.count = be16_to_cpu(tmp.count);
+        ret.flags = tmp1.flags;
-    ret.cda = be32_to_cpu(tmp.cda);
+        ret.count = be16_to_cpu(tmp1.count);
-
+        ret.cda = be32_to_cpu(tmp1.cda);
+    } else {
+        cpu_physical_memory_read(addr, &tmp0, sizeof(tmp0));
+        ret.cmd_code = tmp0.cmd_code;
+        ret.flags = tmp0.flags;
+        ret.count = be16_to_cpu(tmp0.count);
+        ret.cda = be16_to_cpu(tmp0.cda1) | (tmp0.cda0 << 16);
+    }
     return ret;
 }
 
@@ -268,7 +276,8 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
         return -EIO;
     }
 
-    ccw = copy_ccw_from_guest(ccw_addr);
+    /* Translate everything to format-1 ccws - the information is the same. */
+    ccw = copy_ccw_from_guest(ccw_addr, sch->ccw_fmt_1);
 
     /* Check for invalid command codes. */
     if ((ccw.cmd_code & 0x0f) == 0) {
@@ -285,6 +294,13 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
 
     check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
 
+    if (!ccw.cda) {
+        if (sch->ccw_no_data_cnt == 255) {
+            return -EINVAL;
+        }
+        sch->ccw_no_data_cnt++;
+    }
+
     /* Look at the command. */
     switch (ccw.cmd_code) {
     case CCW_CMD_NOOP:
@@ -386,6 +402,8 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
             s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
             return;
         }
+        sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT);
+        sch->ccw_no_data_cnt = 0;
     } else {
         s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
     }
@@ -1347,6 +1365,8 @@ void subch_device_save(SubchDev *s, QEMUFile *f)
         qemu_put_byte(f, s->id.ciw[i].command);
         qemu_put_be16(f, s->id.ciw[i].count);
     }
+    qemu_put_byte(f, s->ccw_fmt_1);
+    qemu_put_byte(f, s->ccw_no_data_cnt);
     return;
 }
 
@@ -1402,6 +1422,8 @@ int subch_device_load(SubchDev *s, QEMUFile *f)
         s->id.ciw[i].command = qemu_get_byte(f);
         s->id.ciw[i].count = qemu_get_be16(f);
     }
+    s->ccw_fmt_1 = qemu_get_byte(f);
+    s->ccw_no_data_cnt = qemu_get_byte(f);
     return 0;
 }
 

hw/s390x/css.h

@@ -76,7 +76,9 @@ struct SubchDev {
     hwaddr channel_prog;
     CCW1 last_cmd;
     bool last_cmd_valid;
+    bool ccw_fmt_1;
     bool thinint_active;
+    uint8_t ccw_no_data_cnt;
     /* transport-provided data: */
     int (*ccw_cb) (SubchDev *, CCW1);
     SenseId id;

include/hw/s390x/sclp.h

@@ -28,8 +28,6 @@
 #define SCLP_UNASSIGN_STORAGE                   0x000C0001
 #define SCLP_CMD_READ_EVENT_DATA                0x00770005
 #define SCLP_CMD_WRITE_EVENT_DATA               0x00760005
-#define SCLP_CMD_READ_EVENT_DATA                0x00770005
-#define SCLP_CMD_WRITE_EVENT_DATA               0x00760005
 #define SCLP_CMD_WRITE_EVENT_MASK               0x00780005
 
 /* SCLP Memory hotplug codes */

target-s390x/ioinst.h

@@ -156,6 +156,16 @@ typedef struct ORB {
 #define ORB_CTRL1_MASK_ORBX 0x01
 #define ORB_CTRL1_MASK_INVALID 0x3e
 
+/* channel command word (type 0) */
+typedef struct CCW0 {
+        uint8_t cmd_code;
+        uint8_t cda0;
+        uint16_t cda1;
+        uint8_t flags;
+        uint8_t reserved;
+        uint16_t count;
+} QEMU_PACKED CCW0;
+
 /* channel command word (type 1) */
 typedef struct CCW1 {
     uint8_t cmd_code;