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Diffstat (limited to 'drivers/lguest/lguest_device.c')
-rw-r--r--drivers/lguest/lguest_device.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index ced5b44cebce..84f85e23cca7 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -54,7 +54,7 @@ struct lguest_device {
*
* The configuration information for a device consists of one or more
* virtqueues, a feature bitmaks, and some configuration bytes. The
- * configuration bytes don't really matter to us: the Launcher set them up, and
+ * configuration bytes don't really matter to us: the Launcher sets them up, and
* the driver will look at them during setup.
*
* A convenient routine to return the device's virtqueue config array:
@@ -139,9 +139,20 @@ static u8 lg_get_status(struct virtio_device *vdev)
static void lg_set_status(struct virtio_device *vdev, u8 status)
{
+ BUG_ON(!status);
to_lgdev(vdev)->desc->status = status;
}
+/* To reset the device, we (ab)use the NOTIFY hypercall, with the descriptor
+ * address of the device. The Host will zero the status and all the
+ * features. */
+static void lg_reset(struct virtio_device *vdev)
+{
+ unsigned long offset = (void *)to_lgdev(vdev)->desc - lguest_devices;
+
+ hcall(LHCALL_NOTIFY, (max_pfn<<PAGE_SHIFT) + offset, 0, 0);
+}
+
/*
* Virtqueues
*
@@ -279,6 +290,7 @@ static struct virtio_config_ops lguest_config_ops = {
.set = lg_set,
.get_status = lg_get_status,
.set_status = lg_set_status,
+ .reset = lg_reset,
.find_vq = lg_find_vq,
.del_vq = lg_del_vq,
};