Changeset 48132 in vbox for trunk/src/VBox/HostDrivers

Timestamp:

Aug 28, 2013 5:27:43 PM (11 years ago)

Author:

vboxsync

Message:

VMM: Ditch VBOX_WITH_VMMR0_DISABLE_PREEMPTION.

Location:

trunk/src/VBox/HostDrivers/Support

Files:

• Makefile.kmk (modified) (1 diff)
• win/SUPDrv-win.cpp (modified) (1 diff)

trunk/src/VBox/HostDrivers/Support/Makefile.kmk

@@ -275 +275 @@
  ifdef VBOX_WITHOUT_NATIVE_R0_LOADER
   VBoxDrv_DEFS.win       += VBOX_WITHOUT_NATIVE_R0_LOADER
- endif
- ifdef VBOX_WITH_VMMR0_DISABLE_PREEMPTION
-  VBoxDrv_DEFS.win       += VBOX_WITH_VMMR0_DISABLE_PREEMPTION
  endif
 

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

@@ -452 +452 @@
         && pSession->fUnrestricted == true)
     {
-#ifdef VBOX_WITH_VMMR0_DISABLE_PREEMPTION
         int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
-#else
+
+#if 0   /* When preemption was not used i.e. !VBOX_WITH_VMMR0_DISABLE_PREEMPTION. That's no longer required. */
         /* Raise the IRQL to DISPATCH_LEVEL to prevent Windows from rescheduling us to another CPU/core. */
         Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);