Re: [RFC PATCH] iommu/vt-d: Add IOTLB flush support for kernel addresses

[Joerg Roedel <joro@8bytes.org>]

Hi David,

On Tue, Oct 20, 2015 at 04:52:59PM +0100, David Woodhouse wrote:
>  void flush_tlb_kernel_range(unsigned long start, unsigned long end)
>  {
> +	intel_iommu_flush_kernel_pasid(start, end);

A more generic naming would be good, and probably expose it through a
function in the IOMMU-API.

> +void intel_iommu_flush_kernel_pasid(unsigned long start, unsigned long end)
> +{
> +	struct dmar_drhd_unit *drhd;
> +	struct intel_iommu *iommu;
> +	unsigned long pages;

And I think, as a performance optimiztion, we should bail out early here
if the pasid has no users.



	Joerg

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