[PATCH v20210701 10/40] tools: add xc_is_known_page_type to libxenctrl

[Olaf Hering <olaf@xxxxxxxxx>]

Users of xc_get_pfn_type_batch may want to sanity check the data
returned by Xen. Add a simple helper for this purpose.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

v02:
- rename xc_is_known_page_type to sr_is_known_page_type
- move from ctrl/xc_private.h to saverestore/common.h (jgross)
---
 tools/libs/saverestore/common.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/libs/saverestore/common.h b/tools/libs/saverestore/common.h
index ca2eb47a4f..07c506360c 100644
--- a/tools/libs/saverestore/common.h
+++ b/tools/libs/saverestore/common.h
@@ -467,6 +467,39 @@ int populate_pfns(struct xc_sr_context *ctx, unsigned int 
count,
 /* Handle a STATIC_DATA_END record. */
 int handle_static_data_end(struct xc_sr_context *ctx);
 
+/* Sanitiy check for types returned by Xen */
+static inline bool sr_is_known_page_type(xen_pfn_t type)
+{
+    bool ret;
+
+    switch (type)
+    {
+    case XEN_DOMCTL_PFINFO_NOTAB:
+
+    case XEN_DOMCTL_PFINFO_L1TAB:
+    case XEN_DOMCTL_PFINFO_L1TAB | XEN_DOMCTL_PFINFO_LPINTAB:
+
+    case XEN_DOMCTL_PFINFO_L2TAB:
+    case XEN_DOMCTL_PFINFO_L2TAB | XEN_DOMCTL_PFINFO_LPINTAB:
+
+    case XEN_DOMCTL_PFINFO_L3TAB:
+    case XEN_DOMCTL_PFINFO_L3TAB | XEN_DOMCTL_PFINFO_LPINTAB:
+
+    case XEN_DOMCTL_PFINFO_L4TAB:
+    case XEN_DOMCTL_PFINFO_L4TAB | XEN_DOMCTL_PFINFO_LPINTAB:
+
+    case XEN_DOMCTL_PFINFO_XTAB:
+    case XEN_DOMCTL_PFINFO_XALLOC: /* Synthetic type in Xen 4.2 - 4.5 */
+    case XEN_DOMCTL_PFINFO_BROKEN:
+        ret = true;
+        break;
+    default:
+        ret = false;
+        break;
+    }
+    return ret;
+}
+
 #endif
 /*
  * Local variables: