pc-bios/s390-ccw: Use the ccw bios to start the network boot

We want to use the ccw bios to start final network boot. To do
this we use ccw bios to detect if the boot device is a virtio
network device and retrieve the start address of the
network boot image.

Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

5 files changed, 25 insertions, 8 deletions

diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index 611102e3ef..b21c877b53 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -724,11 +724,17 @@ static void zipl_load_vscsi(void)
 
 void zipl_load(void)
 {
-    if (virtio_get_device()->is_cdrom) {
+    VDev *vdev = virtio_get_device();
+
+    if (vdev->is_cdrom) {
         ipl_iso_el_torito();
         panic("\n! Cannot IPL this ISO image !\n");
     }
 
+    if (virtio_get_device_type() == VIRTIO_ID_NET) {
+        jump_to_IPL_code(vdev->netboot_start_addr);
+    }
+
     ipl_scsi();
 
     switch (virtio_get_device_type()) {
diff --git a/pc-bios/s390-ccw/iplb.h b/pc-bios/s390-ccw/iplb.h
index 86abc56a90..890aed9ece 100644
--- a/pc-bios/s390-ccw/iplb.h
+++ b/pc-bios/s390-ccw/iplb.h
@@ -13,7 +13,8 @@
 #define IPLB_H
 
 struct IplBlockCcw {
-    uint8_t  reserved0[85];
+    uint64_t netboot_start_addr;
+    uint8_t  reserved0[77];
     uint8_t  ssid;
     uint16_t devno;
     uint8_t  vm_flags;
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 345b848752..0946766d86 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -53,6 +53,12 @@ static bool find_dev(Schib *schib, int dev_no)
         if (!virtio_is_supported(blk_schid)) {
             continue;
         }
+        /* Skip net devices since no IPLB is created and therefore no
+         * no network bootloader has been loaded
+         */
+        if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
+            continue;
+        }
         if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) {
             return true;
         }
@@ -67,6 +73,7 @@ static void virtio_setup(void)
     int ssid;
     bool found = false;
     uint16_t dev_no;
+    VDev *vdev = virtio_get_device();
 
     /*
      * We unconditionally enable mss support. In every sane configuration,
@@ -85,9 +92,6 @@ static void virtio_setup(void)
             found = find_dev(&schib, dev_no);
             break;
         case S390_IPL_TYPE_QEMU_SCSI:
-        {
-            VDev *vdev = virtio_get_device();
-
             vdev->scsi_device_selected = true;
             vdev->selected_scsi_device.channel = iplb.scsi.channel;
             vdev->selected_scsi_device.target = iplb.scsi.target;
@@ -95,7 +99,6 @@ static void virtio_setup(void)
             blk_schid.ssid = iplb.scsi.ssid & 0x3;
             found = find_dev(&schib, iplb.scsi.devno);
             break;
-        }
         default:
             panic("List-directed IPL not supported yet!\n");
         }
@@ -111,9 +114,14 @@ static void virtio_setup(void)
 
     IPL_assert(found, "No virtio device found");
 
-    virtio_setup_device(blk_schid);
+    if (virtio_get_device_type() == VIRTIO_ID_NET) {
+        sclp_print("Network boot device detected\n");
+        vdev->netboot_start_addr = iplb.ccw.netboot_start_addr;
+    } else {
+        virtio_setup_device(blk_schid);
 
-    IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected");
+        IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected");
+    }
 }
 
 int main(void)
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index b333734955..6ee93d56db 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -585,6 +585,7 @@ bool virtio_is_supported(SubChannelId schid)
         switch (vdev.senseid.cu_model) {
         case VIRTIO_ID_BLOCK:
         case VIRTIO_ID_SCSI:
+        case VIRTIO_ID_NET:
             return true;
         }
     }
diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
index eb35ea5faf..3388a423e5 100644
--- a/pc-bios/s390-ccw/virtio.h
+++ b/pc-bios/s390-ccw/virtio.h
@@ -276,6 +276,7 @@ struct VDev {
     uint8_t scsi_dev_heads;
     bool scsi_device_selected;
     ScsiDevice selected_scsi_device;
+    uint64_t netboot_start_addr;
 };
 typedef struct VDev VDev;