s390/virtio-ccw: migration support

This patch adds live migration support for virtio-ccw devices.
It's not done with vmstate because virtio itself is not yet ported
to vmstate either.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

3 files changed, 208 insertions, 0 deletions

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index a813b239ce..67b22aeeee 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1293,6 +1293,117 @@ int css_enable_mss(void)
     return 0;
 }
 
+void subch_device_save(SubchDev *s, QEMUFile *f)
+{
+    int i;
+
+    qemu_put_byte(f, s->cssid);
+    qemu_put_byte(f, s->ssid);
+    qemu_put_be16(f, s->schid);
+    qemu_put_be16(f, s->devno);
+    qemu_put_byte(f, s->thinint_active);
+    /* SCHIB */
+    /*     PMCW */
+    qemu_put_be32(f, s->curr_status.pmcw.intparm);
+    qemu_put_be16(f, s->curr_status.pmcw.flags);
+    qemu_put_be16(f, s->curr_status.pmcw.devno);
+    qemu_put_byte(f, s->curr_status.pmcw.lpm);
+    qemu_put_byte(f, s->curr_status.pmcw.pnom);
+    qemu_put_byte(f, s->curr_status.pmcw.lpum);
+    qemu_put_byte(f, s->curr_status.pmcw.pim);
+    qemu_put_be16(f, s->curr_status.pmcw.mbi);
+    qemu_put_byte(f, s->curr_status.pmcw.pom);
+    qemu_put_byte(f, s->curr_status.pmcw.pam);
+    qemu_put_buffer(f, s->curr_status.pmcw.chpid, 8);
+    qemu_put_be32(f, s->curr_status.pmcw.chars);
+    /*     SCSW */
+    qemu_put_be16(f, s->curr_status.scsw.flags);
+    qemu_put_be16(f, s->curr_status.scsw.ctrl);
+    qemu_put_be32(f, s->curr_status.scsw.cpa);
+    qemu_put_byte(f, s->curr_status.scsw.dstat);
+    qemu_put_byte(f, s->curr_status.scsw.cstat);
+    qemu_put_be16(f, s->curr_status.scsw.count);
+    qemu_put_be64(f, s->curr_status.mba);
+    qemu_put_buffer(f, s->curr_status.mda, 4);
+    /* end SCHIB */
+    qemu_put_buffer(f, s->sense_data, 32);
+    qemu_put_be64(f, s->channel_prog);
+    /* last cmd */
+    qemu_put_byte(f, s->last_cmd.cmd_code);
+    qemu_put_byte(f, s->last_cmd.flags);
+    qemu_put_be16(f, s->last_cmd.count);
+    qemu_put_be32(f, s->last_cmd.cda);
+    qemu_put_byte(f, s->last_cmd_valid);
+    qemu_put_byte(f, s->id.reserved);
+    qemu_put_be16(f, s->id.cu_type);
+    qemu_put_byte(f, s->id.cu_model);
+    qemu_put_be16(f, s->id.dev_type);
+    qemu_put_byte(f, s->id.dev_model);
+    qemu_put_byte(f, s->id.unused);
+    for (i = 0; i < ARRAY_SIZE(s->id.ciw); i++) {
+        qemu_put_byte(f, s->id.ciw[i].type);
+        qemu_put_byte(f, s->id.ciw[i].command);
+        qemu_put_be16(f, s->id.ciw[i].count);
+    }
+    return;
+}
+
+int subch_device_load(SubchDev *s, QEMUFile *f)
+{
+    int i;
+
+    s->cssid = qemu_get_byte(f);
+    s->ssid = qemu_get_byte(f);
+    s->schid = qemu_get_be16(f);
+    s->devno = qemu_get_be16(f);
+    s->thinint_active = qemu_get_byte(f);
+    /* SCHIB */
+    /*     PMCW */
+    s->curr_status.pmcw.intparm = qemu_get_be32(f);
+    s->curr_status.pmcw.flags = qemu_get_be16(f);
+    s->curr_status.pmcw.devno = qemu_get_be16(f);
+    s->curr_status.pmcw.lpm = qemu_get_byte(f);
+    s->curr_status.pmcw.pnom  = qemu_get_byte(f);
+    s->curr_status.pmcw.lpum = qemu_get_byte(f);
+    s->curr_status.pmcw.pim = qemu_get_byte(f);
+    s->curr_status.pmcw.mbi = qemu_get_be16(f);
+    s->curr_status.pmcw.pom = qemu_get_byte(f);
+    s->curr_status.pmcw.pam = qemu_get_byte(f);
+    qemu_get_buffer(f, s->curr_status.pmcw.chpid, 8);
+    s->curr_status.pmcw.chars = qemu_get_be32(f);
+    /*     SCSW */
+    s->curr_status.scsw.flags = qemu_get_be16(f);
+    s->curr_status.scsw.ctrl = qemu_get_be16(f);
+    s->curr_status.scsw.cpa = qemu_get_be32(f);
+    s->curr_status.scsw.dstat = qemu_get_byte(f);
+    s->curr_status.scsw.cstat = qemu_get_byte(f);
+    s->curr_status.scsw.count = qemu_get_be16(f);
+    s->curr_status.mba = qemu_get_be64(f);
+    qemu_get_buffer(f, s->curr_status.mda, 4);
+    /* end SCHIB */
+    qemu_get_buffer(f, s->sense_data, 32);
+    s->channel_prog = qemu_get_be64(f);
+    /* last cmd */
+    s->last_cmd.cmd_code = qemu_get_byte(f);
+    s->last_cmd.flags = qemu_get_byte(f);
+    s->last_cmd.count = qemu_get_be16(f);
+    s->last_cmd.cda = qemu_get_be32(f);
+    s->last_cmd_valid = qemu_get_byte(f);
+    s->id.reserved = qemu_get_byte(f);
+    s->id.cu_type = qemu_get_be16(f);
+    s->id.cu_model = qemu_get_byte(f);
+    s->id.dev_type = qemu_get_be16(f);
+    s->id.dev_model = qemu_get_byte(f);
+    s->id.unused = qemu_get_byte(f);
+    for (i = 0; i < ARRAY_SIZE(s->id.ciw); i++) {
+        s->id.ciw[i].type = qemu_get_byte(f);
+        s->id.ciw[i].command = qemu_get_byte(f);
+        s->id.ciw[i].count = qemu_get_be16(f);
+    }
+    return 0;
+}
+
+
 static void css_init(void)
 {
     channel_subsys = g_malloc0(sizeof(*channel_subsys));
diff --git a/hw/s390x/css.h b/hw/s390x/css.h
index 6586106fa7..c864ea765b 100644
--- a/hw/s390x/css.h
+++ b/hw/s390x/css.h
@@ -85,6 +85,8 @@ struct SubchDev {
 
 typedef SubchDev *(*css_subch_cb_func)(uint8_t m, uint8_t cssid, uint8_t ssid,
                                        uint16_t schid);
+void subch_device_save(SubchDev *s, QEMUFile *f);
+int subch_device_load(SubchDev *s, QEMUFile *f);
 int css_create_css_image(uint8_t cssid, bool default_image);
 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno);
 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index c4f21d3816..05656a2887 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1275,6 +1275,97 @@ irqroute_error:
     return r;
 }
 
+static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
+
+    qemu_put_be16(f, virtio_queue_vector(vdev, n));
+}
+
+static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
+    uint16_t vector;
+
+    qemu_get_be16s(f, &vector);
+    virtio_queue_set_vector(vdev, n , vector);
+
+    return 0;
+}
+
+static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    SubchDev *s = dev->sch;
+
+    subch_device_save(s, f);
+    if (dev->indicators != NULL) {
+        qemu_put_be32(f, dev->indicators->len);
+        qemu_put_be64(f, dev->indicators->addr);
+    } else {
+        qemu_put_be32(f, 0);
+        qemu_put_be64(f, 0UL);
+    }
+    if (dev->indicators2 != NULL) {
+        qemu_put_be32(f, dev->indicators2->len);
+        qemu_put_be64(f, dev->indicators2->addr);
+    } else {
+        qemu_put_be32(f, 0);
+        qemu_put_be64(f, 0UL);
+    }
+    if (dev->summary_indicator != NULL) {
+        qemu_put_be32(f, dev->summary_indicator->len);
+        qemu_put_be64(f, dev->summary_indicator->addr);
+    } else {
+        qemu_put_be32(f, 0);
+        qemu_put_be64(f, 0UL);
+    }
+    qemu_put_be64(f, dev->routes.adapter.ind_offset);
+    qemu_put_byte(f, dev->thinint_isc);
+}
+
+static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
+{
+    VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+    SubchDev *s = dev->sch;
+    int len;
+
+    s->driver_data = dev;
+    subch_device_load(s, f);
+    len = qemu_get_be32(f);
+    if (len != 0) {
+        dev->indicators = get_indicator(qemu_get_be64(f), len);
+    } else {
+        qemu_get_be64(f);
+        dev->indicators = NULL;
+    }
+    len = qemu_get_be32(f);
+    if (len != 0) {
+        dev->indicators2 = get_indicator(qemu_get_be64(f), len);
+    } else {
+        qemu_get_be64(f);
+        dev->indicators2 = NULL;
+    }
+    len = qemu_get_be32(f);
+    if (len != 0) {
+        dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
+    } else {
+        qemu_get_be64(f);
+        dev->summary_indicator = NULL;
+    }
+    dev->routes.adapter.ind_offset = qemu_get_be64(f);
+    dev->thinint_isc = qemu_get_byte(f);
+    if (s->thinint_active) {
+        return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
+                                       dev->thinint_isc, true, false,
+                                       &dev->routes.adapter.adapter_id);
+    }
+
+    return 0;
+}
+
 /**************** Virtio-ccw Bus Device Descriptions *******************/
 
 static Property virtio_ccw_net_properties[] = {
@@ -1597,6 +1688,10 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
     k->set_host_notifier = virtio_ccw_set_host_notifier;
     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
+    k->save_queue = virtio_ccw_save_queue;
+    k->load_queue = virtio_ccw_load_queue;
+    k->save_config = virtio_ccw_save_config;
+    k->load_config = virtio_ccw_load_config;
 }
 
 static const TypeInfo virtio_ccw_bus_info = {