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Diffstat (limited to 'drivers/xen/gntdev.c')
-rw-r--r--drivers/xen/gntdev.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 20c65771017d..d5bb1a33d0a3 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -93,6 +93,7 @@ struct grant_map {
struct gnttab_map_grant_ref *kmap_ops;
struct gnttab_unmap_grant_ref *kunmap_ops;
struct page **pages;
+ unsigned long pages_vm_start;
};
static int unmap_grant_pages(struct grant_map *map, int offset, int pages);
@@ -446,9 +447,18 @@ static void gntdev_vma_close(struct vm_area_struct *vma)
gntdev_put_map(priv, map);
}
+static struct page *gntdev_vma_find_special_page(struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ struct grant_map *map = vma->vm_private_data;
+
+ return map->pages[(addr - map->pages_vm_start) >> PAGE_SHIFT];
+}
+
static struct vm_operations_struct gntdev_vmops = {
.open = gntdev_vma_open,
.close = gntdev_vma_close,
+ .find_special_page = gntdev_vma_find_special_page,
};
/* ------------------------------------------------------------------ */
@@ -874,6 +884,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
set_grant_ptes_as_special, NULL);
}
#endif
+ map->pages_vm_start = vma->vm_start;
}
return 0;