virtio-gpu uses cached mappings, set
drm_gem_shmem_object.map_cached accordingly.

Cc: [email protected]
Fixes: c66df701e783 ("drm/virtio: switch from ttm to gem shmem helpers")
Reported-by: Gurchetan Singh <[email protected]>
Reported-by: Guillaume Gardet <[email protected]>
Signed-off-by: Gerd Hoffmann <[email protected]>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c 
b/drivers/gpu/drm/virtio/virtgpu_object.c
index 3d2a6d489bfc..59319435218f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -119,6 +119,7 @@ struct drm_gem_object *virtio_gpu_create_object(struct 
drm_device *dev,
                return NULL;
 
        bo->base.base.funcs = &virtio_gpu_gem_funcs;
+       bo->base.map_cached = true;
        return &bo->base.base;
 }
 
-- 
2.18.2

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