KVM: Introduce kvm_memory_slot::arch and move lpage_info into it
[linux-2.6.git] / arch / x86 / kvm / x86.c
index 3df0b7a..ca74c1d 100644 (file)
@@ -6239,6 +6239,65 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
                put_page(kvm->arch.ept_identity_pagetable);
 }
 
+void kvm_arch_free_memslot(struct kvm_memory_slot *free,
+                          struct kvm_memory_slot *dont)
+{
+       int i;
+
+       for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+               if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) {
+                       vfree(free->arch.lpage_info[i]);
+                       free->arch.lpage_info[i] = NULL;
+               }
+       }
+}
+
+int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
+{
+       int i;
+
+       for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+               unsigned long ugfn;
+               int lpages;
+               int level = i + 2;
+
+               lpages = gfn_to_index(slot->base_gfn + npages - 1,
+                                     slot->base_gfn, level) + 1;
+
+               slot->arch.lpage_info[i] =
+                       vzalloc(lpages * sizeof(*slot->arch.lpage_info[i]));
+               if (!slot->arch.lpage_info[i])
+                       goto out_free;
+
+               if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
+                       slot->arch.lpage_info[i][0].write_count = 1;
+               if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
+                       slot->arch.lpage_info[i][lpages - 1].write_count = 1;
+               ugfn = slot->userspace_addr >> PAGE_SHIFT;
+               /*
+                * If the gfn and userspace address are not aligned wrt each
+                * other, or if explicitly asked to, disable large page
+                * support for this slot
+                */
+               if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
+                   !kvm_largepages_enabled()) {
+                       unsigned long j;
+
+                       for (j = 0; j < lpages; ++j)
+                               slot->arch.lpage_info[i][j].write_count = 1;
+               }
+       }
+
+       return 0;
+
+out_free:
+       for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+               vfree(slot->arch.lpage_info[i]);
+               slot->arch.lpage_info[i] = NULL;
+       }
+       return -ENOMEM;
+}
+
 int kvm_arch_prepare_memory_region(struct kvm *kvm,
                                struct kvm_memory_slot *memslot,
                                struct kvm_memory_slot old,