Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function

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To: Tianyu Lan <ltykernel@xxxxxxxxx>
Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 14 Jun 2021 09:12:23 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, arnd@xxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, rppt@xxxxxxxxxx, hannes@xxxxxxxxxxx, cai@xxxxxx, krish.sadhukhan@xxxxxxxxxx, saravanand@xxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, thomas.lendacky@xxxxxxx, brijesh.singh@xxxxxxx, sunilmut@xxxxxxxxxxxxx
In-reply-to: <48516ce3-564c-419e-b355-0ce53794dcb1@gmail.com>
References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-9-ltykernel@gmail.com> <20210607064312.GB24478@lst.de> <48516ce3-564c-419e-b355-0ce53794dcb1@gmail.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Mon, Jun 07, 2021 at 10:56:47PM +0800, Tianyu Lan wrote:
> These addresses in extra address space works as system memory mirror. The 
> shared memory with host in Isolation VM needs to be accessed via extra 
> address space which is above shared gpa boundary.

Why?

Follow-Ups:
- Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
  - From: Tianyu Lan
- Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
  - From: Tom Lendacky

References:
- [RFC PATCH V3 00/11] x86/Hyper-V: Add Hyper-V Isolation VM support
  - From: Tianyu Lan
- [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
  - From: Tianyu Lan
- Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
  - From: Christoph Hellwig
- Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
  - From: Tianyu Lan

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