From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [Patch RFC 11/13] vt-d: If the Device-TLB flush is
 still not completed when
Date: Wed, 23 Sep 2015 13:38:33 -0400
Message-ID: <20150923173833.GA26016@l.oracle.com>
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To: Quan Xu <quan.xu@intel.com>
Cc: kevin.tian@intel.com, keir@xen.org, eddie.dong@intel.com, jun.nakajima@intel.com, andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com, tim@xen.org, george.dunlap@eu.citrix.com, jbeulich@suse.com, yang.z.zhang@intel.com, xen-devel@lists.xen.org, ian.campbell@citrix.com
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> index 5dc0033..f661c8c 100644
> --- a/xen/include/xen/hvm/iommu.h
> +++ b/xen/include/xen/hvm/iommu.h
> @@ -20,6 +20,7 @@
>  #define __XEN_HVM_IOMMU_H__
>  
>  #include <xen/iommu.h>
> +#include <xen/wait.h>
>  #include <xen/list.h>
>  #include <asm/hvm/iommu.h>
>  
> @@ -56,12 +57,15 @@ struct hvm_iommu {
>      struct page_list_head qi_hold_page_list;
>      spinlock_t qi_lock;
>  
> +    struct waitqueue_head qi_wq;
> +


Is there anything that mandates this must be an HVM guest? As in - can't you
have ATS with an PV guest (and doing passthrough?)