Changeset 93223 in vbox

Timestamp:

Jan 13, 2022 12:07:19 PM (3 years ago)

Author:

vboxsync

Message:

VMM: Nested VMX: bugref:10092 When Unrestricted Guest is supported by the CPU, the CPU still reports PE and PG bits as MB1 in IA32_VMX_CR0_FIXED0. It's just VMX instructions ignores them.

Location:

trunk

Files:

• include/VBox/vmm/hm_vmx.h (modified) (1 diff)
• src/VBox/VMM/VMMR3/CPUM.cpp (modified) (1 diff)

trunk/include/VBox/vmm/hm_vmx.h

@@ -3692 +3692 @@
 /** CR0 bits set here must always be set when in VMX operation. */
 #define VMX_V_CR0_FIXED0                                        (X86_CR0_PE | X86_CR0_NE | X86_CR0_PG)
-/** VMX_V_CR0_FIXED0 when unrestricted-guest execution is supported for the guest. */
-#define VMX_V_CR0_FIXED0_UX                                     (VMX_V_CR0_FIXED0 & ~(X86_CR0_PE | X86_CR0_PG))
 /** CR4 bits set here must always be set when in VMX operation. */
 #define VMX_V_CR4_FIXED0                                        (X86_CR4_VMXE)

trunk/src/VBox/VMM/VMMR3/CPUM.cpp

@@ -1442 +1442 @@
 
     /* CR0 Fixed-0. */
-    pGuestVmxMsrs->u64Cr0Fixed0 = pGuestFeatures->fVmxUnrestrictedGuest ? VMX_V_CR0_FIXED0_UX : VMX_V_CR0_FIXED0;
+    pGuestVmxMsrs->u64Cr0Fixed0 = VMX_V_CR0_FIXED0;
 
     /* CR0 Fixed-1. */