virtio: add support for 64 bit features.

Change u32 to u64, and use BIT_ULL and 1ULL everywhere.

Note: transports are unchanged, and only set low 32 bit.
This guarantees that no transport sets e.g. VERSION_1
by mistake without proper support.

Based on patch by Rusty.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 10 insertions, 10 deletions

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index ffc2ae04879c..f51788439574 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -66,7 +66,7 @@ struct virtio_config_ops {
                         vq_callback_t *callbacks[],
                         const char *names[]);
         void (*del_vqs)(struct virtio_device *);
-        u32 (*get_features)(struct virtio_device *vdev);
+        u64 (*get_features)(struct virtio_device *vdev);
         void (*finalize_features)(struct virtio_device *vdev);
         const char *(*bus_name)(struct virtio_device *vdev);
         int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
@@ -88,11 +88,11 @@ static inline bool __virtio_test_bit(const struct virtio_device *vdev,
 {
         /* Did you forget to fix assumptions on max features? */
         if (__builtin_constant_p(fbit))
-                BUILD_BUG_ON(fbit >= 32);
+                BUILD_BUG_ON(fbit >= 64);
         else
-                BUG_ON(fbit >= 32);
+                BUG_ON(fbit >= 64);
 
-        return vdev->features & BIT(fbit);
+        return vdev->features & BIT_ULL(fbit);
 }
 
 /**
@@ -105,11 +105,11 @@ static inline void __virtio_set_bit(struct virtio_device *vdev,
 {
         /* Did you forget to fix assumptions on max features? */
         if (__builtin_constant_p(fbit))
-                BUILD_BUG_ON(fbit >= 32);
+                BUILD_BUG_ON(fbit >= 64);
         else
-                BUG_ON(fbit >= 32);
+                BUG_ON(fbit >= 64);
 
-        vdev->features |= BIT(fbit);
+        vdev->features |= BIT_ULL(fbit);
 }
 
 /**
@@ -122,11 +122,11 @@ static inline void __virtio_clear_bit(struct virtio_device *vdev,
 {
         /* Did you forget to fix assumptions on max features? */
         if (__builtin_constant_p(fbit))
-                BUILD_BUG_ON(fbit >= 32);
+                BUILD_BUG_ON(fbit >= 64);
         else
-                BUG_ON(fbit >= 32);
+                BUG_ON(fbit >= 64);
 
-        vdev->features &= ~BIT(fbit);
+        vdev->features &= ~BIT_ULL(fbit);
 }
 
 /**