From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Northup <digitaleric@google.com>
Subject: Re: [PATCH v2] KVM: Introduce direct MSI message injection for
 in-kernel irqchips
Date: Wed, 28 Mar 2012 12:58:37 -0700
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Cc: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>,
	kvm <kvm@vger.kernel.org>, "Michael S. Tsirkin" <mst@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
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On Wed, Mar 28, 2012 at 10:47 AM, Jan Kiszka <jan.kiszka@siemens.com> wrote:
[...]
> +4.61 KVM_SET_MSI
> +
> +Capability: KVM_CAP_SET_MSI
> +Architectures: x86
> +Type: vm ioctl
> +Parameters: struct kvm_msi (in)
> +Returns: 0 on success, -1 on error

Is this the actual behavior?  It looked to me like the successful
return value ended up getting set by __apic_accept_irq(), which claims
to "Return 1 if successfully added and 0 if discarded".