[S390] Add hotplug support

I just submitted a few patches that enable the s390 virtio bus to receive
a hotplug add event. This patch implements the qemu side of it, so that new
hotplug events can be submitted to the guest.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - make s390 virtio hoplug code emulate-capable

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/s390-virtio-bus.h b/hw/s390-virtio-bus.h
index f1bece738b..d02a90709d 100644
--- a/hw/s390-virtio-bus.h
+++ b/hw/s390-virtio-bus.h
@@ -35,6 +35,11 @@
 #define VIRTIO_RING_LEN			(TARGET_PAGE_SIZE * 3)
 #define S390_DEVICE_PAGES		512
 
+#define VIRTIO_PARAM_MASK               0xff
+#define VIRTIO_PARAM_VRING_INTERRUPT    0x0
+#define VIRTIO_PARAM_CONFIG_CHANGED     0x1
+#define VIRTIO_PARAM_DEV_ADD            0x2
+
 typedef struct VirtIOS390Device {
     DeviceState qdev;
     ram_addr_t dev_offs;