KVM: MMU: Use gfn_to_rmap() instead of directly reading rmap array

This helps to make rmap architecture specific in a later patch.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/mmu.c

@@ -1181,7 +1181,8 @@ void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
 	unsigned long *rmapp;
 
 	while (mask) {
-		rmapp = &slot->rmap[gfn_offset + __ffs(mask)];
+		rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask),
+				      PT_PAGE_TABLE_LEVEL, slot);
 		__rmap_write_protect(kvm, rmapp, PT_PAGE_TABLE_LEVEL, false);
 
 		/* clear the first set bit */

arch/x86/kvm/mmu_audit.c

@@ -190,7 +190,6 @@ static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp)
 
 static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
-	struct kvm_memory_slot *slot;
 	unsigned long *rmapp;
 	u64 *sptep;
 	struct rmap_iterator iter;
@@ -198,8 +197,7 @@ static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
 	if (sp->role.direct || sp->unsync || sp->role.invalid)
 		return;
 
-	slot = gfn_to_memslot(kvm, sp->gfn);
-	rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
+	rmapp = gfn_to_rmap(kvm, sp->gfn, PT_PAGE_TABLE_LEVEL);
 
 	for (sptep = rmap_get_first(*rmapp, &iter); sptep;
 	     sptep = rmap_get_next(&iter)) {