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>
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9c20456a32
Коммит
d39f13b0da
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@ -114,6 +114,7 @@ struct kvm {
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struct kvm_io_bus pio_bus;
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struct kvm_vm_stat stat;
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struct kvm_arch arch;
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atomic_t users_count;
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};
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/* The guest did something we don't support. */
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@ -140,6 +141,9 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
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struct module *module);
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void kvm_exit(void);
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void kvm_get_kvm(struct kvm *kvm);
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void kvm_put_kvm(struct kvm *kvm);
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#define HPA_MSB ((sizeof(hpa_t) * 8) - 1)
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#define HPA_ERR_MASK ((hpa_t)1 << HPA_MSB)
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static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; }
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@ -193,6 +193,7 @@ static struct kvm *kvm_create_vm(void)
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mutex_init(&kvm->lock);
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kvm_io_bus_init(&kvm->mmio_bus);
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init_rwsem(&kvm->slots_lock);
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atomic_set(&kvm->users_count, 1);
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spin_lock(&kvm_lock);
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list_add(&kvm->vm_list, &vm_list);
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spin_unlock(&kvm_lock);
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@ -242,11 +243,25 @@ static void kvm_destroy_vm(struct kvm *kvm)
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mmdrop(mm);
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}
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void kvm_get_kvm(struct kvm *kvm)
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{
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atomic_inc(&kvm->users_count);
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}
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EXPORT_SYMBOL_GPL(kvm_get_kvm);
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void kvm_put_kvm(struct kvm *kvm)
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{
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if (atomic_dec_and_test(&kvm->users_count))
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kvm_destroy_vm(kvm);
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}
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EXPORT_SYMBOL_GPL(kvm_put_kvm);
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static int kvm_vm_release(struct inode *inode, struct file *filp)
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{
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struct kvm *kvm = filp->private_data;
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kvm_destroy_vm(kvm);
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kvm_put_kvm(kvm);
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return 0;
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}
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