S390: Add virtio-blk boot

If no kernel IPL entry is specified, boot the bios and pass if available
device information for the first boot device (as given by the boot index).

The provided information will be used in the next commit from the BIOS.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 18 insertions, 0 deletions

diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index d14c548d88..0aeb003c9d 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -16,6 +16,8 @@
 #include "elf.h"
 #include "hw/loader.h"
 #include "hw/sysbus.h"
+#include "hw/s390x/virtio-ccw.h"
+#include "hw/s390x/css.h"
 
 #define KERN_IMAGE_START                0x010000UL
 #define KERN_PARM_AREA                  0x010480UL
@@ -150,6 +152,22 @@ static void s390_ipl_reset(DeviceState *dev)
 
     env->psw.addr = ipl->start_addr;
     env->psw.mask = IPL_PSW_MASK;
+
+    if (!ipl->kernel) {
+        /* booting firmware, tell what device to boot from */
+        DeviceState *dev_st = get_boot_device(0);
+        VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
+                OBJECT(&(dev_st->parent_obj)), "virtio-blk-ccw");
+
+        if (ccw_dev) {
+            env->regs[7] = ccw_dev->sch->cssid << 24 |
+                           ccw_dev->sch->ssid << 16 |
+                           ccw_dev->sch->devno;
+        } else {
+            env->regs[7] = -1;
+        }
+    }
+
     s390_add_running_cpu(cpu);
 }