Changeset 21710 in vbox for trunk/src/VBox/VMM

Timestamp:

Jul 17, 2009 4:13:04 PM (16 years ago)

Author:

vboxsync

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

50265

Message:

A TPR change could activate a pending interrupt, so catch lstar writes.

File:

• trunk/src/VBox/VMM/VMMR0/HWSVMR0.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HWSVMR0.cpp

@@ -1081 +1081 @@
             /* Our patch code uses LSTAR for TPR caching. */
             pCtx->msrLSTAR = u8LastTPR;
+
+            if (fPending)
+            {
+                /* A TPR change could activate a pending interrupt, so catch lstar writes. */
+                svmR0SetMSRPermission(pVM, MSR_K8_LSTAR, true, false);
+            }
+            else
+                /* No interrupts are pending, so we don't need to be explicitely notified.
+                * There are enough world switches for detecting pending interrupts.
+                */
+                svmR0SetMSRPermission(pVM, MSR_K8_LSTAR, true, true);
         }
         else