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

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Message-ID: <25fdc11c-06b9-c16f-8427-77ac7673855c@linux.intel.com>
Date:   Thu, 28 Apr 2022 08:16:27 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Tianyu Lan <ltykernel@...il.com>, m.szyprowski@...sung.com,
        michael.h.kelley@...rosoft.com, kys@...rosoft.com,
        parri.andrea@...il.com, thomas.lendacky@....com,
        wei.liu@...nel.org, Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, konrad.wilk@...cle.com,
        linux-kernel@...r.kernel.org, kirill.shutemov@...el.com,
        iommu@...ts.linux-foundation.org, andi.kleen@...el.com,
        brijesh.singh@....com, vkuznets@...hat.com, hch@....de
Subject: Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock


On 4/28/2022 8:05 AM, Christoph Hellwig wrote:
> 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.


That's what the original patch (that this one is derived from) did.

It was completely transparent to everyone outside swiotlb.c

-Andi