Changeset 21962 in vbox

Timestamp:

Aug 4, 2009 3:11:31 PM (15 years ago)

Author:

vboxsync

Message:

SUPLib: touch ring-3 mappings so darwin.amd64 doesn't #PF when accessing them from kernel space. This ASSUMES that the kernel won't be reusing these pmap entries. (This problem and solution is similar to what rtR0MapObjNativeMapKernel experiences and does about it.)

File:

• trunk/src/VBox/HostDrivers/Support/SUPLib.cpp (modified) (4 diffs)

trunk/src/VBox/HostDrivers/Support/SUPLib.cpp

@@ -147 +147 @@
 static int supLoadModule(const char *pszFilename, const char *pszModule, const char *pszSrvReqHandler, void **ppvImageBase);
 static DECLCALLBACK(int) supLoadModuleResolveImport(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, RTUINTPTR *pValue, void *pvUser);
+
+
+/** Touch a range of pages. */
+DECLINLINE(void) supR3TouchPages(void *pv, size_t cPages)
+{
+    uint32_t volatile *pu32 = (uint32_t volatile *)pv;
+    while (cPages-- > 0)
+    {
+        ASMAtomicCmpXchgU32(pu32, 0, 0);
+        pu32 += PAGE_SIZE / sizeof(uint32_t);
+    }
+}
 
 
@@ -1060 +1072 @@
                         Assert(!(paPages[iPage].Phys & ~X86_PTE_PAE_PG_MASK));
                     }
+#ifdef RT_OS_DARWIN /* HACK ALERT! */
+                supR3TouchPages(pReq->u.Out.pvR3, cPages);
+#endif
             }
             else if (   rc == VERR_NOT_SUPPORTED
@@ -1245 +1260 @@
         if (pR0Ptr)
             *pR0Ptr = Req.u.Out.pvR0;
+#ifdef RT_OS_DARWIN /* HACK ALERT! */
+        supR3TouchPages(Req.u.Out.pvR3, cPages);
+#endif
         return Req.u.Out.pvR3;
     }
@@ -1342 +1360 @@
                     Assert(paPages[iPage].Phys <= UINT32_C(0xfffff000));
                 }
+#ifdef RT_OS_DARWIN /* HACK ALERT! */
+            supR3TouchPages(pReq->u.Out.pvR3, cPages);
+#endif
         }
         RTMemTmpFree(pReq);