Changeset 11763 in vbox

Timestamp:

Aug 28, 2008 2:27:11 PM (16 years ago)

Author:

vboxsync

Message:

Host CR0 CD, NW & ET bits are not restored after a VM exit. We must not allow the guest to change them.

File:

• trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp

@@ -888 +888 @@
               | X86_CR0_PG  /* Must monitor this bit (assumptions are made for real mode & protected mode without paging emulation) */
               | X86_CR0_TS
-              | X86_CR0_ET
-              | X86_CR0_CD  /* Cache disable must not be changed! */
+              | X86_CR0_ET  /* Bit not restored during VM-exit! */
+              | X86_CR0_CD  /* Bit not restored during VM-exit! */
+              | X86_CR0_NW  /* Bit not restored during VM-exit! */
               | X86_CR0_NE
               | X86_CR0_MP;