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Date:   Wed, 21 Jul 2021 16:33:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     Christoph Hellwig <hch@....de>, 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, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        jgross@...e.com, sstabellini@...nel.org, joro@...tes.org,
        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, arnd@...db.de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        kirill.shutemov@...ux.intel.com, akpm@...ux-foundation.org,
        rppt@...nel.org, Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        ardb@...nel.org, robh@...nel.org, nramas@...ux.microsoft.com,
        pgonda@...gle.com, martin.b.radev@...il.com, david@...hat.com,
        krish.sadhukhan@...cle.com, saravanand@...com,
        xen-devel@...ts.xenproject.org, keescook@...omium.org,
        rientjes@...gle.com, hannes@...xchg.org,
        michael.h.kelley@...rosoft.com, iommu@...ts.linux-foundation.org,
        linux-arch@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com, brijesh.singh@....com,
        anparri@...rosoft.com
Subject: Re: [Resend RFC PATCH V4 09/13] x86/Swiotlb/HV: Add Swiotlb bounce
 buffer remap function for HV IVM

On Wed, Jul 21, 2021 at 06:28:48PM +0800, Tianyu Lan wrote:
> dma_mmap_attrs() and dma_get_sgtable_attrs() get input virtual address
> belonging to backing memory with struct page and returns bounce buffer
> dma physical address which is below shared_gpa_boundary(vTOM) and passed
> to Hyper-V via vmbus protocol.
>
> The new map virtual address is only to access bounce buffer in swiotlb
> code and will not be used other places. It's stored in the mem->vstart.
> So the new API set_memory_decrypted_map() in this series is only called
> in the swiotlb code. Other platforms may replace set_memory_decrypted()
> with set_memory_decrypted_map() as requested.

It seems like you are indeed not using these new helpers in
dma_direct_alloc.  How is dma_alloc_attrs/dma_alloc_coherent going to
work on these systems?

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