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authorRusty Russell <rusty@rustcorp.com.au>2008-05-02 21:50:53 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-05-02 21:50:54 +1000
commita007a751d98fe97142e4724a83a4e31ec66b7532 (patch)
treeab9d1d844688834875359c600982a3c8ae738014 /drivers/lguest/lguest_device.c
parent9f3f746741d917fe3c6c544c7d319d533176d90b (diff)
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lguest: make Launcher see device status updates
This brings us closer to Real Life, where we'd examine the device features once it's set the DRIVER_OK status bit. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lguest_device.c')
-rw-r--r--drivers/lguest/lguest_device.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 7a643a6ee9a1..8080249957af 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -144,20 +144,26 @@ static u8 lg_get_status(struct virtio_device *vdev)
return to_lgdev(vdev)->desc->status;
}
+/* To notify on status updates, we (ab)use the NOTIFY hypercall, with the
+ * descriptor address of the device. A zero status means "reset". */
+static void set_status(struct virtio_device *vdev, u8 status)
+{
+ unsigned long offset = (void *)to_lgdev(vdev)->desc - lguest_devices;
+
+ /* We set the status. */
+ to_lgdev(vdev)->desc->status = status;
+ hcall(LHCALL_NOTIFY, (max_pfn<<PAGE_SHIFT) + offset, 0, 0);
+}
+
static void lg_set_status(struct virtio_device *vdev, u8 status)
{
BUG_ON(!status);
- to_lgdev(vdev)->desc->status = status;
+ set_status(vdev, 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);
+ set_status(vdev, 0);
}
/*