KVM: MMU: Introduce generic walk_addr function

This is the first patch in the series towards a generic
walk_addr implementation which could walk two-dimensional
page tables in the end. In this first step the walk_addr
function is renamed into walk_addr_generic which takes a
mmu context as an additional parameter.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/paging_tmpl.h

@@ -114,9 +114,10 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
 /*
  * Fetch a guest pte for a guest virtual address
  */
-static int FNAME(walk_addr)(struct guest_walker *walker,
-			    struct kvm_vcpu *vcpu, gva_t addr,
-			    int write_fault, int user_fault, int fetch_fault)
+static int FNAME(walk_addr_generic)(struct guest_walker *walker,
+				    struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+				    gva_t addr, int write_fault,
+				    int user_fault, int fetch_fault)
 {
 	pt_element_t pte;
 	gfn_t table_gfn;
@@ -129,10 +130,11 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
 walk:
 	present = true;
 	eperm = rsvd_fault = false;
-	walker->level = vcpu->arch.mmu.root_level;
-	pte = vcpu->arch.mmu.get_cr3(vcpu);
+	walker->level = mmu->root_level;
+	pte           = mmu->get_cr3(vcpu);
+
 #if PTTYPE == 64
-	if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
+	if (walker->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)) {
@@ -143,7 +145,7 @@ walk:
 	}
 #endif
 	ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) ||
-	       (vcpu->arch.mmu.get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0);
+	       (mmu->get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0);
 
 	pt_access = ACC_ALL;
 
@@ -205,7 +207,7 @@ walk:
 				(PTTYPE == 64 || is_pse(vcpu))) ||
 		    ((walker->level == PT_PDPE_LEVEL) &&
 				is_large_pte(pte) &&
-				vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL)) {
+				mmu->root_level == PT64_ROOT_LEVEL)) {
 			int lvl = walker->level;
 
 			walker->gfn = gpte_to_gfn_lvl(pte, lvl);
@@ -266,6 +268,14 @@ error:
 	return 0;
 }
 
+static int FNAME(walk_addr)(struct guest_walker *walker,
+			    struct kvm_vcpu *vcpu, gva_t addr,
+			    int write_fault, int user_fault, int fetch_fault)
+{
+	return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.mmu, addr,
+					write_fault, user_fault, fetch_fault);
+}
+
 static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 			      u64 *spte, const void *pte)
 {