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Date:   Fri, 9 Jul 2021 14:21:14 +0000
From:   Wei Liu <wei.liu@kernel.org>
To:     Lu Baolu <baolu.lu@linux.intel.com>
Cc:     Wei Liu <wei.liu@kernel.org>,
        Linux on Hyper-V List <linux-hyperv@vger.kernel.org>,
        virtualization@lists.linux-foundation.org,
        Linux Kernel List <linux-kernel@vger.kernel.org>,
        Michael Kelley <mikelley@microsoft.com>,
        Vineeth Pillai <viremana@linux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@microsoft.com>,
        Nuno Das Neves <nunodasneves@linux.microsoft.com>,
        kumarpraveen@linux.microsoft.com, pasha.tatashin@soleen.com,
        David Woodhouse <dwmw2@infradead.org>,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        "open list:INTEL IOMMU (VT-d)" <iommu@lists.linux-foundation.org>
Subject: Re: [RFC v1 4/8] intel/vt-d: export intel_iommu_get_resv_regions
Message-ID: <20210709142114.r5vhxmmp6mzq3vjl@liuwe-devbox-debian-v2>
References: <20210709114339.3467637-1-wei.liu@kernel.org>
 <20210709114339.3467637-5-wei.liu@kernel.org>
 <f32e17d4-e435-cd50-8afc-68f6133fd1a0@linux.intel.com>
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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.