KVM: MMU: Check for root_level instead of long mode

The walk_addr function checks for !is_long_mode in its 64
bit version. But what is meant here is a check for pae
paging. Change the condition to really check for pae paging
so that it also works with nested nested paging.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/paging_tmpl.h

@@ -132,7 +132,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
 	walker->level = vcpu->arch.mmu.root_level;
 	pte = vcpu->arch.cr3;
 #if PTTYPE == 64
-	if (!is_long_mode(vcpu)) {
+	if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
 		pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
 		trace_kvm_mmu_paging_element(pte, walker->level);
 		if (!is_present_gpte(pte)) {
@@ -205,7 +205,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
 				(PTTYPE == 64 || is_pse(vcpu))) ||
 		    ((walker->level == PT_PDPE_LEVEL) &&
 				is_large_pte(pte) &&
-				is_long_mode(vcpu))) {
+				vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL)) {
 			int lvl = walker->level;
 
 			walker->gfn = gpte_to_gfn_lvl(pte, lvl);