@@ -13,6 +13,7 @@
#include <xen/config.h>
#include <xen/types.h>
#include <xen/init.h>
+#include <xen/guest_access.h>
#include <xen/device_tree.h>
#include <xen/kernel.h>
#include <xen/lib.h>
@@ -277,6 +278,24 @@ struct dt_device_node *dt_find_node_by_path(const char *path)
return np;
}
+int dt_find_node_by_gpath(XEN_GUEST_HANDLE(char) u_path, uint32_t u_plen,
+ struct dt_device_node **node)
+{
+ char *path;
+ int ret;
+
+ ret = safe_copy_string_from_guest(u_path, &path, u_plen,
+ DEVICE_TREE_MAX_PATHLEN);
+ if ( ret )
+ return ret;
+
+ *node = dt_find_node_by_path(path);
+
+ xfree(path);
+
+ return (*node == NULL) ? -ESRCH : 0;
+}
+
struct dt_device_node *dt_find_node_by_alias(const char *alias)
{
const struct dt_alias_prop *app;
@@ -20,6 +20,9 @@
#define DEVICE_TREE_MAX_DEPTH 16
+/* This limit is used by the hypercalls to restrict the size of the path */
+#define DEVICE_TREE_MAX_PATHLEN 1024
+
/*
* Struct used for matching a device
*/
@@ -442,6 +445,20 @@ struct dt_device_node *dt_find_node_by_alias(const char *alias);
*/
struct dt_device_node *dt_find_node_by_path(const char *path);
+
+/**
+ * dt_find_node_by_gpath - Same as dt_find_node_by_path but retrieve the
+ * path from the guest
+ *
+ * @u_path: Xen Guest handle to the buffer containing the path
+ * @u_plen: Length of the buffer
+ * @node: TODO
+ *
+ * Return 0 if succeed otherwise -errno
+ */
+int dt_find_node_by_gpath(XEN_GUEST_HANDLE(char) u_path, uint32_t u_plen,
+ struct dt_device_node **node);
+
/**
* dt_get_parent - Get a node's parent if any
* @node: Node to get parent
Signed-off-by: Julien Grall <julien.grall@linaro.org> --- Changes in v2: - guest_copy_string_from_guest has been renamed into safe_copy_string_from_guest --- xen/common/device_tree.c | 19 +++++++++++++++++++ xen/include/xen/device_tree.h | 17 +++++++++++++++++ 2 files changed, 36 insertions(+)