[patch 02/11] KVM: modify alias layout in x86s struct kvm_arch

[Marcelo Tosatti]

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

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

Index: kvm/arch/x86/include/asm/kvm_host.h
===================================================================
--- kvm.orig/arch/x86/include/asm/kvm_host.h
+++ kvm/arch/x86/include/asm/kvm_host.h
@@ -370,9 +370,13 @@ struct kvm_mem_alias {
        gfn_t target_gfn;
 };
 
-struct kvm_arch{
-       int naliases;
+struct kvm_mem_aliases {
        struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
+       int naliases;
+};
+
+struct kvm_arch {
+       struct kvm_mem_aliases *aliases;
 
        unsigned int n_free_mmu_pages;
        unsigned int n_requested_mmu_pages;
Index: kvm/arch/x86/kvm/x86.c
===================================================================
--- kvm.orig/arch/x86/kvm/x86.c
+++ kvm/arch/x86/kvm/x86.c
@@ -2228,9 +2228,10 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t
 {
        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;
@@ -2248,6 +2249,7 @@ static int kvm_vm_ioctl_set_memory_alias
 {
        int r, n;
        struct kvm_mem_alias *p;
+       struct kvm_mem_aliases *aliases;
 
        r = -EINVAL;
        /* General sanity checks */
@@ -2267,15 +2269,17 @@ static int kvm_vm_ioctl_set_memory_alias
        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);
@@ -5157,6 +5161,12 @@ 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);
 
@@ -5213,6 +5223,7 @@ 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);
 }
 


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