Changeset 4593 in vbox

Timestamp:

Sep 7, 2007 8:01:32 AM (17 years ago)

Author:

vboxsync

Message:

Don't modify the X86_CR4_VMXE flag.

File:

• trunk/src/VBox/VMM/VMMSwitcher/PAEand32Bit.mac (modified) (1 diff)

trunk/src/VBox/VMM/VMMSwitcher/PAEand32Bit.mac

@@ -180 +180 @@
     ; Also disable WP. (eax==cr4 now)
     ; Note! X86_CR4_PSE and X86_CR4_PAE are important if the host thinks so :-)
-    ;
-    and     eax, X86_CR4_MCE | X86_CR4_PSE | X86_CR4_PAE
+    ; Note! X86_CR4_VMXE must not be touched in case the CPU is in vmx root mode
+    ;
+    and     eax, X86_CR4_MCE | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_VMXE
     mov     ecx, [edx + CPUM.Guest.cr4]
     ;; @todo Switcher cleanup: Determin base CR4 during CPUMR0Init / VMMR3SelectSwitcher putting it