Changeset 23430 in vbox for trunk/src/VBox/HostDrivers

Timestamp:

Sep 30, 2009 9:53:51 AM (15 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

53011

Message:

Experiment with KeSetSystemAffinityThread instead of raising the IRQL to DISPATCH_LEVEL when running guest code. (potential problem case -> take note!)

File:

• trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp (modified) (2 diffs)

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

@@ -325 +325 @@
         int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
 #else
+# if 1 /* experiment */
+        /* Prevent Windows from rescheduling us to another CPU/core. */
+        KeSetSystemAffinityThread((KAFFINITY)1 << KeGetCurrentProcessorNumber());
+        int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
+        KeSetSystmeAffinityThread(KeQueryActiveProcessors());
+# else /* old code */
         /* Raise the IRQL to DISPATCH_LEVEL to prevent Windows from rescheduling us to another CPU/core. */
         Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);
@@ -331 +337 @@
         int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
         KeLowerIrql(oldIrql);
+# endif
 #endif