From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit
Date: Wed, 5 Aug 2015 15:29:54 +0200
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On 05/08/2015 15:21, Radim Kr=C4=8Dm=C3=A1=C5=99 wrote:
> +	kvm_for_each_vcpu(idx, vcpu, kvm)
> +		if (vcpu->vcpu_id =3D=3D vcpu_id) {
> +			kvm_make_request(KVM_REQ_EXIT, vcpu);
> +			kvm_vcpu_kick(vcpu);
> +
> +			return 0;
> +		}
> +

Why not a vcpu ioctl?  kvm_for_each_vcpu can become pretty expensive if
you have a few dozen VCPUs.

Paolo