[PATCH v20210601 05/38] tools: add xc_is_known_page_type to libxenctrl

[Olaf Hering <olaf@aepfle.de>]

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@aepfle.de>
---
 tools/libs/ctrl/xc_private.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/libs/ctrl/xc_private.h b/tools/libs/ctrl/xc_private.h
index 5d2c7274fb..afb08aafe1 100644
--- a/tools/libs/ctrl/xc_private.h
+++ b/tools/libs/ctrl/xc_private.h
@@ -421,6 +421,39 @@ void *xc_map_foreign_ranges(xc_interface *xch, uint32_t dom,
 int xc_get_pfn_type_batch(xc_interface *xch, uint32_t dom,
                           unsigned int num, xen_pfn_t *);
 
+/* Sanitiy check for types returned by Xen */
+static inline bool xc_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:
+    case XEN_DOMCTL_PFINFO_BROKEN:
+        ret = true;
+        break;
+    default:
+        ret = false;
+        break;
+    }
+    return ret;
+}
+
 void bitmap_64_to_byte(uint8_t *bp, const uint64_t *lp, int nbits);
 void bitmap_byte_to_64(uint64_t *lp, const uint8_t *bp, int nbits);