Re: [Xen-devel] [PATCH v3] IOMMU: Prevent VT-d device IOTLB operations on wrong IOMMU

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.06.14 at 16:37, <malcolm.crossley@xxxxxxxxxx> wrote:
> --- a/xen/drivers/passthrough/vtd/x86/ats.c
> +++ b/xen/drivers/passthrough/vtd/x86/ats.c
> @@ -120,6 +120,10 @@ int dev_invalidate_iotlb(struct iommu *i
>      {
>          sid = (pdev->bus << 8) | pdev->devfn;
>  
> +        /* Only invalidate devices that belong to this IOMMU */
> +        if ( !pdev->iommu || pdev->iommu != iommu )
> +            continue;

I meant to ask before and then forgot: What is the first half of this
condition good/needed for?

Jan


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