KVM: add vm refcounting

the main purpose of adding this functions is the abilaty to release the
spinlock that protect the kvm list while still be able to do operations
on a specific kvm in a safe way.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f4e143621e3512b517a19e9eb4280f0dfbd34a36..a2ceb51b42742676777e752dbe9983eb3b5f7849 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -114,6 +114,7 @@ struct kvm {
        struct kvm_io_bus pio_bus;
        struct kvm_vm_stat stat;
        struct kvm_arch arch;
+       atomic_t users_count;
 };
 
 /* The guest did something we don't support. */
@@ -140,6 +141,9 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
                  struct module *module);
 void kvm_exit(void);
 
+void kvm_get_kvm(struct kvm *kvm);
+void kvm_put_kvm(struct kvm *kvm);
+
 #define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
 #define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
 static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 41d4b65191366369033a84ce643f369d90ce69b2..93ed78b015c04ec1fd388b99a4f36630fa90ab5c 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -193,6 +193,7 @@ static struct kvm *kvm_create_vm(void)
        mutex_init(&kvm->lock);
        kvm_io_bus_init(&kvm->mmio_bus);
        init_rwsem(&kvm->slots_lock);
+       atomic_set(&kvm->users_count, 1);
        spin_lock(&kvm_lock);
        list_add(&kvm->vm_list, &vm_list);
        spin_unlock(&kvm_lock);
@@ -242,11 +243,25 @@ static void kvm_destroy_vm(struct kvm *kvm)
        mmdrop(mm);
 }
 
+void kvm_get_kvm(struct kvm *kvm)
+{
+       atomic_inc(&kvm->users_count);
+}
+EXPORT_SYMBOL_GPL(kvm_get_kvm);
+
+void kvm_put_kvm(struct kvm *kvm)
+{
+       if (atomic_dec_and_test(&kvm->users_count))
+               kvm_destroy_vm(kvm);
+}
+EXPORT_SYMBOL_GPL(kvm_put_kvm);
+
+
 static int kvm_vm_release(struct inode *inode, struct file *filp)
 {
        struct kvm *kvm = filp->private_data;
 
-       kvm_destroy_vm(kvm);
+       kvm_put_kvm(kvm);
        return 0;
 }