[RFC PATCH 3/8] virtio-pci: save/restore config space across S4

[Amit Shah <amit.shah@redhat.com>]

The virtio config space doesn't get saved across hibernation; we save it
locally and update it after restore.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 drivers/virtio/virtio_pci.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 579681f..9c37561 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -56,6 +56,10 @@ struct virtio_pci_device
 	unsigned msix_vectors;
 	/* Vectors allocated, excluding per-vq vectors if any */
 	unsigned msix_used_vectors;
+
+	/* Status saved during hibernate/restore */
+	u8 saved_status;
+
 	/* Whether we have vector per vq */
 	bool per_vq_vectors;
 };
@@ -713,6 +717,7 @@ static int virtio_pci_freeze(struct device *dev)
 	drv = container_of(vp_dev->vdev.dev.driver,
 			   struct virtio_driver, driver);
 
+	vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
 	if (drv && drv->freeze)
 		return drv->freeze(&vp_dev->vdev);
 
@@ -728,6 +733,7 @@ static int virtio_pci_restore(struct device *dev)
 	drv = container_of(vp_dev->vdev.dev.driver,
 			   struct virtio_driver, driver);
 
+	vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
 	if (drv && drv->restore)
 		return drv->restore(&vp_dev->vdev);
 
-- 
1.7.6