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-rw-r--r--arch/s390/include/asm/kvm_virtio.h1
-rw-r--r--drivers/s390/kvm/kvm_virtio.c47
2 files changed, 48 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_virtio.h b/arch/s390/include/asm/kvm_virtio.h
index 3f5d100a42a..72f614181ef 100644
--- a/arch/s390/include/asm/kvm_virtio.h
+++ b/arch/s390/include/asm/kvm_virtio.h
@@ -59,5 +59,6 @@ struct kvm_vqconfig {
#define VIRTIO_PARAM_MASK 0xff
#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
+#define VIRTIO_PARAM_DEV_ADD 0x2
#endif
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 68cef4da15e..5a46b8c5d68 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -32,6 +32,7 @@
* The pointer to our (page) of device descriptions.
*/
static void *kvm_devices;
+struct work_struct hotplug_work;
struct kvm_device {
struct virtio_device vdev;
@@ -328,6 +329,47 @@ static void scan_devices(void)
}
/*
+ * match for a kvm device with a specific desc pointer
+ */
+static int match_desc(struct device *dev, void *data)
+{
+ if ((ulong)to_kvmdev(dev_to_virtio(dev))->desc == (ulong)data)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * hotplug_device tries to find changes in the device page.
+ */
+static void hotplug_devices(struct work_struct *dummy)
+{
+ unsigned int i;
+ struct kvm_device_desc *d;
+ struct device *dev;
+
+ for (i = 0; i < PAGE_SIZE; i += desc_size(d)) {
+ d = kvm_devices + i;
+
+ /* end of list */
+ if (d->type == 0)
+ break;
+
+ /* device already exists */
+ dev = device_find_child(kvm_root, d, match_desc);
+ if (dev) {
+ /* XXX check for hotplug remove */
+ put_device(dev);
+ continue;
+ }
+
+ /* new device */
+ printk(KERN_INFO "Adding new virtio device %p\n", d);
+ add_kvm_device(d, i);
+ }
+}
+
+/*
* we emulate the request_irq behaviour on top of s390 extints
*/
static void kvm_extint_handler(u16 code)
@@ -357,6 +399,9 @@ static void kvm_extint_handler(u16 code)
break;
}
+ case VIRTIO_PARAM_DEV_ADD:
+ schedule_work(&hotplug_work);
+ break;
case VIRTIO_PARAM_VRING_INTERRUPT:
default:
vring_interrupt(0, vq);
@@ -390,6 +435,8 @@ static int __init kvm_devices_init(void)
kvm_devices = (void *) real_memory_size;
+ INIT_WORK(&hotplug_work, hotplug_devices);
+
ctl_set_bit(0, 9);
register_external_interrupt(0x2603, kvm_extint_handler);