KVM: Portability: Add two hooks to handle kvm_create and destroy vm

Add two arch hooks to handle kvm_create_vm and kvm destroy_vm. Now, just
put io_bus init and destory in common.
Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm.h

@@ -674,6 +674,10 @@ int kvm_arch_hardware_setup(void);
 void kvm_arch_hardware_unsetup(void);
 void kvm_arch_check_processor_compat(void *rtn);
 
+void kvm_free_physmem(struct kvm *kvm);
+
+struct  kvm *kvm_arch_create_vm(void);
+void kvm_arch_destroy_vm(struct kvm *kvm);
 
 static inline void kvm_guest_enter(void)
 {

drivers/kvm/kvm_main.c

@@ -156,18 +156,18 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 
 static struct kvm *kvm_create_vm(void)
 {
-	struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
+	struct kvm *kvm = kvm_arch_create_vm();
 
-	if (!kvm)
-		return ERR_PTR(-ENOMEM);
+	if (IS_ERR(kvm))
+		goto out;
 
 	kvm_io_bus_init(&kvm->pio_bus);
 	mutex_init(&kvm->lock);
-	INIT_LIST_HEAD(&kvm->active_mmu_pages);
 	kvm_io_bus_init(&kvm->mmio_bus);
 	spin_lock(&kvm_lock);
 	list_add(&kvm->vm_list, &vm_list);
 	spin_unlock(&kvm_lock);
+out:
 	return kvm;
 }
 
@@ -188,7 +188,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 	free->rmap = NULL;
 }
 
-static void kvm_free_physmem(struct kvm *kvm)
+void kvm_free_physmem(struct kvm *kvm)
 {
 	int i;
 
@@ -196,32 +196,6 @@ static void kvm_free_physmem(struct kvm *kvm)
 		kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 }
 
-static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
-{
-	vcpu_load(vcpu);
-	kvm_mmu_unload(vcpu);
-	vcpu_put(vcpu);
-}
-
-static void kvm_free_vcpus(struct kvm *kvm)
-{
-	unsigned int i;
-
-	/*
-	 * Unpin any mmu pages first.
-	 */
-	for (i = 0; i < KVM_MAX_VCPUS; ++i)
-		if (kvm->vcpus[i])
-			kvm_unload_vcpu_mmu(kvm->vcpus[i]);
-	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
-		if (kvm->vcpus[i]) {
-			kvm_arch_vcpu_free(kvm->vcpus[i]);
-			kvm->vcpus[i] = NULL;
-		}
-	}
-
-}
-
 static void kvm_destroy_vm(struct kvm *kvm)
 {
 	spin_lock(&kvm_lock);
@@ -229,11 +203,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	spin_unlock(&kvm_lock);
 	kvm_io_bus_destroy(&kvm->pio_bus);
 	kvm_io_bus_destroy(&kvm->mmio_bus);
-	kfree(kvm->vpic);
-	kfree(kvm->vioapic);
-	kvm_free_vcpus(kvm);
-	kvm_free_physmem(kvm);
-	kfree(kvm);
+	kvm_arch_destroy_vm(kvm);
 }
 
 static int kvm_vm_release(struct inode *inode, struct file *filp)

drivers/kvm/x86.c

@@ -2543,3 +2543,50 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 	kvm_mmu_destroy(vcpu);
 	free_page((unsigned long)vcpu->pio_data);
 }
+
+struct  kvm *kvm_arch_create_vm(void)
+{
+	struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
+
+	if (!kvm)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_LIST_HEAD(&kvm->active_mmu_pages);
+
+	return kvm;
+}
+
+static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
+{
+	vcpu_load(vcpu);
+	kvm_mmu_unload(vcpu);
+	vcpu_put(vcpu);
+}
+
+static void kvm_free_vcpus(struct kvm *kvm)
+{
+	unsigned int i;
+
+	/*
+	 * Unpin any mmu pages first.
+	 */
+	for (i = 0; i < KVM_MAX_VCPUS; ++i)
+		if (kvm->vcpus[i])
+			kvm_unload_vcpu_mmu(kvm->vcpus[i]);
+	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+		if (kvm->vcpus[i]) {
+			kvm_arch_vcpu_free(kvm->vcpus[i]);
+			kvm->vcpus[i] = NULL;
+		}
+	}
+
+}
+
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+	kfree(kvm->vpic);
+	kfree(kvm->vioapic);
+	kvm_free_vcpus(kvm);
+	kvm_free_physmem(kvm);
+	kfree(kvm);
+}