KVM: Remove memory alias support

As advertised in feature-removal-schedule.txt.  Equivalent support is provided
by overlapping memory regions.

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 4 insertions, 13 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8c2f580956d..c5501bc1010 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -434,9 +434,7 @@ static void account_shadowed(struct kvm *kvm, gfn_t gfn)
         int *write_count;
         int i;
 
-        gfn = unalias_gfn(kvm, gfn);
-
-        slot = gfn_to_memslot_unaliased(kvm, gfn);
+        slot = gfn_to_memslot(kvm, gfn);
         for (i = PT_DIRECTORY_LEVEL;
              i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
                 write_count   = slot_largepage_idx(gfn, slot, i);
@@ -450,8 +448,7 @@ static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn)
         int *write_count;
         int i;
 
-        gfn = unalias_gfn(kvm, gfn);
-        slot = gfn_to_memslot_unaliased(kvm, gfn);
+        slot = gfn_to_memslot(kvm, gfn);
         for (i = PT_DIRECTORY_LEVEL;
              i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
                 write_count   = slot_largepage_idx(gfn, slot, i);
@@ -467,8 +464,7 @@ static int has_wrprotected_page(struct kvm *kvm,
         struct kvm_memory_slot *slot;
         int *largepage_idx;
 
-        gfn = unalias_gfn(kvm, gfn);
-        slot = gfn_to_memslot_unaliased(kvm, gfn);
+        slot = gfn_to_memslot(kvm, gfn);
         if (slot) {
                 largepage_idx = slot_largepage_idx(gfn, slot, level);
                 return *largepage_idx;
@@ -521,7 +517,6 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
 
 /*
  * Take gfn and return the reverse mapping to it.
- * Note: gfn must be unaliased before this function get called
  */
 
 static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
@@ -561,7 +556,6 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
 
         if (!is_rmap_spte(*spte))
                 return count;
-        gfn = unalias_gfn(vcpu->kvm, gfn);
         sp = page_header(__pa(spte));
         kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
         rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
@@ -698,7 +692,6 @@ static int rmap_write_protect(struct kvm *kvm, u64 gfn)
         u64 *spte;
         int i, write_protected = 0;
 
-        gfn = unalias_gfn(kvm, gfn);
         rmapp = gfn_to_rmap(kvm, gfn, PT_PAGE_TABLE_LEVEL);
 
         spte = rmap_next(kvm, rmapp, NULL);
@@ -885,7 +878,6 @@ static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
 
         sp = page_header(__pa(spte));
 
-        gfn = unalias_gfn(vcpu->kvm, gfn);
         rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
 
         kvm_unmap_rmapp(vcpu->kvm, rmapp, 0);
@@ -3510,8 +3502,7 @@ static void audit_write_protection(struct kvm_vcpu *vcpu)
                 if (sp->unsync)
                         continue;
 
-                gfn = unalias_gfn(vcpu->kvm, sp->gfn);
-                slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn);
+                slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
                 rmapp = &slot->rmap[gfn - slot->base_gfn];
 
                 spte = rmap_next(vcpu->kvm, rmapp, NULL);