aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/lguest/lguest_device.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/lguest/lguest_device.c')
-rw-r--r--drivers/lguest/lguest_device.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 37344aaee22f..a661bbdae3d6 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -98,6 +98,10 @@ static u32 lg_get_features(struct virtio_device *vdev)
98 return features; 98 return features;
99} 99}
100 100
101/* The virtio core takes the features the Host offers, and copies the
102 * ones supported by the driver into the vdev->features array. Once
103 * that's all sorted out, this routine is called so we can tell the
104 * Host which features we understand and accept. */
101static void lg_finalize_features(struct virtio_device *vdev) 105static void lg_finalize_features(struct virtio_device *vdev)
102{ 106{
103 unsigned int i, bits; 107 unsigned int i, bits;
@@ -108,6 +112,10 @@ static void lg_finalize_features(struct virtio_device *vdev)
108 /* Give virtio_ring a chance to accept features. */ 112 /* Give virtio_ring a chance to accept features. */
109 vring_transport_features(vdev); 113 vring_transport_features(vdev);
110 114
115 /* The vdev->feature array is a Linux bitmask: this isn't the
116 * same as a the simple array of bits used by lguest devices
117 * for features. So we do this slow, manual conversion which is
118 * completely general. */
111 memset(out_features, 0, desc->feature_len); 119 memset(out_features, 0, desc->feature_len);
112 bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; 120 bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
113 for (i = 0; i < bits; i++) { 121 for (i = 0; i < bits; i++) {