linux-kernel - Re: [RFC V2 PATCH 9/12] swiotlb: Add bounce buffer remap address setting function

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Message-ID: <20210414064358.GA25877@lst.de>
Date:   Wed, 14 Apr 2021 08:43:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     konrad.wilk@...cle.com, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        vkuznets@...hat.com, thomas.lendacky@....com,
        brijesh.singh@....com, sunilmut@...rosoft.com
Subject: Re: [RFC V2 PATCH 9/12] swiotlb: Add bounce buffer remap address
 setting function

On Tue, Apr 13, 2021 at 11:22:14AM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> For Hyper-V isolation VM with AMD SEV SNP, the bounce buffer(shared memory)
> needs to be accessed via extra address space(e.g address above bit39).
> Hyper-V code may remap extra address space outside of swiotlb. swiotlb_bounce()
> needs to use remap virtual address to copy data from/to bounce buffer. Add
> new interface swiotlb_set_bounce_remap() to do that.

I have no way to review what this actually doing when you only Cc me
on a single patch.  Please make sure everyone is Cced on the whole
series to enable proper review.