[RFC PATCH 04/19] kvm: Add kvm_enum()

[Adalbert Lazar <alazar@bitdefender.com>]

From: Mihai Dontu <mdontu@bitdefender.com>

This is a helper used by the introspection subsystem to find a specific
VM by UUID or to build a list of UUIDs.

Signed-off-by: Mihai Dontu <mdontu@bitdefender.com>
---
 include/linux/kvm_host.h |  2 ++
 virt/kvm/kvm_main.c      | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 48cd2d856132..88d4e4cbaba5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -549,6 +549,8 @@ static inline void kvm_irqfd_exit(void)
 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 		  struct module *module);
 void kvm_exit(void);
+void kvm_enum(int (*enum_cb) (const struct kvm *kvm, void *param),
+	      void *param);
 
 void kvm_get_kvm(struct kvm *kvm);
 void kvm_put_kvm(struct kvm *kvm);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f0fe9d02f6bb..cfd2d1bf8ac4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4046,3 +4046,15 @@ void kvm_exit(void)
 	kvm_vfio_ops_exit();
 }
 EXPORT_SYMBOL_GPL(kvm_exit);
+
+void kvm_enum(int (*enum_cb) (const struct kvm *kvm, void *param), void *param)
+{
+	struct kvm *kvm;
+
+	spin_lock(&kvm_lock);
+	list_for_each_entry(kvm, &vm_list, vm_list) {
+		if (enum_cb(kvm, param))
+			break;
+	}
+	spin_unlock(&kvm_lock);
+}
-- 
2.12.2