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

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Date:   Wed, 14 Apr 2021 22:12:12 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     konrad.wilk@...cle.com, 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 4/14/2021 2:43 PM, Christoph Hellwig wrote:
> 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.
> 

Sure. I will resend all patches. Thanks for reminder.