linux-kernel - Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit

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Message-ID: <55C20FD2.8020607@redhat.com>
Date:	Wed, 5 Aug 2015 15:29:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit



On 05/08/2015 15:21, Radim Krčmář wrote:
> +	kvm_for_each_vcpu(idx, vcpu, kvm)
> +		if (vcpu->vcpu_id == 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
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