added symbiotic swap check to shadow paging

diff --git a/palacios/src/palacios/vmm_shadow_paging_32.h b/palacios/src/palacios/vmm_shadow_paging_32.h
index bc83a7c..f96485e 100644 (file)
--- a/palacios/src/palacios/vmm_shadow_paging_32.h
+++ b/palacios/src/palacios/vmm_shadow_paging_32.h
@@ -36,6 +36,14 @@ static inline int activate_shadow_pt_32(struct guest_info * info) {
     return 0;
 }
 
+#ifdef __V3_SYMBIOTIC__
+static inline int is_swapped_pte32(pte32_t * pte) {
+    return (*(uint32_t *)pte != 0);
+}
+#endif
+
+
+
 /* 
  * *
  * * 
@@ -221,11 +229,28 @@ static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault
 
        PrintDebug("Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n", 
                   guest_pte_access, *(uint_t*)&error_code);
+#ifdef __V3_SYMBIOTIC__
+       if (is_swapped_pg(guest_pte)) {
+           PrintError("Page fault on swapped out page\n");
+
+           if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+               PrintError("Could not inject guest page fault\n");
+               return -1;
+           }
+
 
+       } else {
+           if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+               PrintError("Could not inject guest page fault\n");
+               return -1;
+           }
+       }
+#else
        if (inject_guest_pf(info, fault_addr, error_code) == -1) {
            PrintError("Could not inject guest page fault\n");
            return -1;
        }
+#endif
 
        return 0; 
     }