Changeset 4960 in vbox

Timestamp:

Sep 21, 2007 2:58:57 PM (17 years ago)

Author:

vboxsync

Message:

Raise IRQL to DISPATCH_LEVEL to prevent Windows from rescheduling us to a different CPU.

Location:

trunk/src/VBox

Files:

• HostDrivers/Support/win/SUPDrv-win.cpp (modified) (1 diff)
• VMM/VMMR0/VMMR0.cpp (modified) (3 diffs)

trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp

@@ -280 +280 @@
         ||  ulCmd == SUP_IOCTL_FAST_DO_NOP)
     {
-        int rc = supdrvIOCtlFast(ulCmd, pDevExt, pSession);
+        KIRQL oldIrql;
+        int   rc;
+
+                /* Raise the IRQL to DISPATCH_LEVEl to prevent Windows from rescheduling us to another CPU/core. */ 
+                Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);
+                KeRaiseIrql(DISPATCH_LEVEL, &oldIrql);        
+        rc = supdrvIOCtlFast(ulCmd, pDevExt, pSession);
+        KeLowerIrql(oldIrql);
 
         /* Complete the I/O request. */

trunk/src/VBox/VMM/VMMR0/VMMR0.cpp

@@ -550 +550 @@
  * @param   pVM             The VM to operate on.
  * @param   enmOperation    Which operation to execute.
- * @remarks Assume called with interrupts disabled.
+ * @remarks Assume called with interrupts _enabled_.
  */
 VMMR0DECL(int) VMMR0EntryFast(PVM pVM, VMMR0OPERATION enmOperation)
@@ -594 +594 @@
             STAM_COUNTER_INC(&pVM->vmm.s.StatRunGC);
 
+#ifndef RT_OS_WINDOWS /* @todo check other hosts */
+            /* We must disable interrupts here */
+            RTCCUINTREG uFlags = ASMIntDisableFlags();
+#endif
             int rc = HWACCMR0Enable(pVM);
             if (VBOX_SUCCESS(rc))
@@ -608 +612 @@
             }
             pVM->vmm.s.iLastGCRc = rc;
+#ifndef RT_OS_WINDOWS /* @todo check other hosts */
+            ASMSetFlags(uFlags);
+#endif
 
 #ifdef VBOX_WITH_STATISTICS