xen/gntdev: provide find_special_page VMA operation

For a PV guest, use the find_special_page op to find the right page. To handle VMAs being split, remember the start of the original VMA so the correct index in the pages array can be calculated. Signed-off-by: David Vrabel <[email protected]> Reviewed-by: Stefano Stabellini <[email protected]>
fastly · Jan 28, 2015 · dab069c · dab069c
1 parent 923b291
commit dab069c
Showing 1 changed file with 11 additions and 0 deletions.
diff --git 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;