linux-kernel - Re: [PATCH 0/2] x86/hyperv/Swiotlb: Add swiotlb_alloc_from_low

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Date:   Wed, 2 Feb 2022 00:12:17 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, hch@...radead.org,
        m.szyprowski@...sung.com, robin.murphy@....com,
        michael.h.kelley@...rosoft.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        brijesh.singh@....com, konrad.wilk@...cle.com, hch@....de,
        parri.andrea@...il.com, thomas.lendacky@....com
Subject: Re: [PATCH 0/2] x86/hyperv/Swiotlb: Add swiotlb_alloc_from_low_pages
 switch

I think this interface is a little too hacky.  In the end all the
non-trusted hypervisor schemes (including the per-device swiotlb one)
can allocate the memory from everywhere and want for force use of
swiotlb.  I think we need some kind of proper interface for that instead
of setting all kinds of global variables.