KVM: modify alias layout in x86s struct kvm_arch

Have a pointer to an allocated region inside x86's kvm_arch.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 16 insertions, 5 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3b81cb9da8b8..1ce833191430 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2227,9 +2227,10 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 {
         int i;
         struct kvm_mem_alias *alias;
+        struct kvm_mem_aliases *aliases = kvm->arch.aliases;
 
-        for (i = 0; i < kvm->arch.naliases; ++i) {
-                alias = &kvm->arch.aliases[i];
+        for (i = 0; i < aliases->naliases; ++i) {
+                alias = &aliases->aliases[i];
                 if (gfn >= alias->base_gfn
                     && gfn < alias->base_gfn + alias->npages)
                         return alias->target_gfn + gfn - alias->base_gfn;
@@ -2247,6 +2248,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
 {
         int r, n;
         struct kvm_mem_alias *p;
+        struct kvm_mem_aliases *aliases;
 
         r = -EINVAL;
         /* General sanity checks */
@@ -2266,15 +2268,17 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
         down_write(&kvm->slots_lock);
         spin_lock(&kvm->mmu_lock);
 
-        p = &kvm->arch.aliases[alias->slot];
+        aliases = kvm->arch.aliases;
+
+        p = &aliases->aliases[alias->slot];
         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
         p->npages = alias->memory_size >> PAGE_SHIFT;
         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
 
         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
-                if (kvm->arch.aliases[n - 1].npages)
+                if (aliases->aliases[n - 1].npages)
                         break;
-        kvm->arch.naliases = n;
+        aliases->naliases = n;
 
         spin_unlock(&kvm->mmu_lock);
         kvm_mmu_zap_all(kvm);
@@ -5158,6 +5162,12 @@ struct  kvm *kvm_arch_create_vm(void)
         if (!kvm)
                 return ERR_PTR(-ENOMEM);
 
+        kvm->arch.aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
+        if (!kvm->arch.aliases) {
+                kfree(kvm);
+                return ERR_PTR(-ENOMEM);
+        }
+
         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
 
@@ -5214,6 +5224,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
                 put_page(kvm->arch.apic_access_page);
         if (kvm->arch.ept_identity_pagetable)
                 put_page(kvm->arch.ept_identity_pagetable);
+        kfree(kvm->arch.aliases);
         kfree(kvm);
 }