Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock

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Subject: Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 28 Apr 2022 08:05:10 -0700
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Tianyu Lan <ltykernel@xxxxxxxxx>, m.szyprowski@xxxxxxxxxxx, michael.h.kelley@xxxxxxxxxxxxx, kys@xxxxxxxxxxxxx, parri.andrea@xxxxxxxxx, thomas.lendacky@xxxxxxx, wei.liu@xxxxxxxxxx, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, linux-hyperv@xxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, andi.kleen@xxxxxxxxx, brijesh.singh@xxxxxxx, vkuznets@xxxxxxxxxx, hch@xxxxxx
In-reply-to: <1517d2f0-08d6-a532-7810-2161b2dff421@linux.intel.com>

On Thu, Apr 28, 2022 at 07:55:39AM -0700, Andi Kleen wrote:
> At least for TDX need parallelism with a single device for performance.

So find a way to make it happen without exposing details to random
drivers.

Follow-Ups:
- Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
  - From: Andi Kleen

References:
- [RFC PATCH 0/2] swiotlb: Introduce swiotlb device allocation function
  - From: Tianyu Lan
- [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
  - From: Tianyu Lan
- Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
  - From: Robin Murphy
- Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
  - From: Christoph Hellwig
- Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock
  - From: Andi Kleen

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