[RFC PATCH 06/19] kvm: Add kvm_vm_shutdown()

[Adalbert Lazar <alazar@bitdefender.com>]

From: Mihai Dontu <mdontu@bitdefender.com>

This function is used by the introspection subsystem to shutdown
a specific VM.

Signed-off-by: Mihai Dontu <mdontu@bitdefender.com>
---
 include/linux/kvm_host.h |  1 +
 virt/kvm/kvm_main.c      | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 545964ed6a63..2f00b5c64632 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -555,6 +555,7 @@ void kvm_exit(void);
 void kvm_enum(int (*enum_cb) (const struct kvm *kvm, void *param),
 	      void *param);
 struct kvm *kvm_from_uuid(const uuid_le *uuid);
+void kvm_vm_shutdown(struct kvm *kvm);
 
 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 31bcdc92f1ea..52d92fcf39ff 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4084,3 +4084,30 @@ struct kvm *kvm_from_uuid(const uuid_le *uuid)
 	spin_unlock(&kvm_lock);
 	return found;
 }
+
+static int kvm_vcpu_kill(int sig, struct kvm_vcpu *vcpu)
+{
+	int err = -ESRCH;
+	struct pid *pid;
+	struct siginfo siginfo[1] = { };
+
+	rcu_read_lock();
+	pid = rcu_dereference(vcpu->pid);
+	if (pid)
+		err = kill_pid_info(sig, siginfo, pid);
+	rcu_read_unlock();
+
+	return err;
+}
+
+void kvm_vm_shutdown(struct kvm *kvm)
+{
+	int i;
+	struct kvm_vcpu *vcpu;
+
+	mutex_lock(&kvm->lock);
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		kvm_vcpu_kill(SIGTERM, vcpu);
+	}
+	mutex_unlock(&kvm->lock);
+}
-- 
2.12.2