linux-kernel - Re: [RFC v1 4/8] intel/vt-d: export intel_iommu_get_resv

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Date:   Fri, 9 Jul 2021 14:21:14 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Wei Liu <wei.liu@...nel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        kumarpraveen@...ux.microsoft.com, pasha.tatashin@...een.com,
        David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux-foundation.org>
Subject: Re: [RFC v1 4/8] intel/vt-d: export intel_iommu_get_resv_regions

On Fri, Jul 09, 2021 at 10:17:25PM +0800, Lu Baolu wrote:
> On 2021/7/9 19:43, Wei Liu wrote:
> > When Microsoft Hypervisor runs on Intel platforms it needs to know the
> > reserved regions to program devices correctly. There is no reason to
> > duplicate intel_iommu_get_resv_regions. Export it.
> 
> Why not using iommu_get_resv_regions()?

That calls into ops->get_resv_regions.

In this patch series, get_resv_regions is hv_iommu_resv_regions, which
wants to use intel_iommu_get_resv_regions when it detects the underlying
hardware platform is from Intel.

Wei.