i386: Catch all non-present ptes in cpu_get_phys_page_debug (Jan Kiszka)

It helps debugging guests when yet unmapped pages are correctly reported
as, well, unmapped.
Signed-off-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5025 c046a42c-6fe2-441c-8c8c-71466251a162

target-i386/helper.c

@@ -1192,6 +1192,8 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
             page_size = 4096;
             pte = ldq_phys(pte_addr);
         }
+        if (!(pte & PG_PRESENT_MASK))
+            return -1;
     } else {
         uint32_t pde;