From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH 5/5] VT-d: adjust IOMMU interrupt affinities
 when all CPUs are online
Date: Wed, 21 Nov 2012 11:10:36 +0000
Message-ID: <CCD2672C.451A0%keir.xen@gmail.com>
References: <50ACB8CE02000078000AA4B0@nat28.tlf.novell.com>
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To: Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
Cc: Wei Huang <wei.huang2@amd.com>, Wei Wang <weiwang.dd@gmail.com>, xiantao.zhang@intel.com, Gang Wei <gang.wei@intel.com>
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On 21/11/2012 10:19, "Jan Beulich" <JBeulich@suse.com> wrote:

> Since these interrupts get setup before APs get brought online, their
> affinities naturally could only ever point to CPU 0 alone so far.
> Adjust this to include potentially multiple CPUs in the target mask
> (when running in one of the cluster modes), and take into account NUMA
> information (to handle the interrupts on a CPU on the node where the
> respective IOMMU is).
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> 
> --- a/xen/drivers/passthrough/vtd/dmar.c
> +++ b/xen/drivers/passthrough/vtd/dmar.c
> @@ -839,6 +839,7 @@ void acpi_dmar_reinstate(void)
>  
>  void acpi_dmar_zap(void)
>  {
> +    adjust_vtd_irq_affinities();

Is this just a handy place to hook? Does it logically make sense?

 -- Keir