linux-kernel - Re: [RFC PATCH] dma-iommu: Add iommu_dma_max_mapping

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Date:   Wed, 18 May 2022 15:12:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     John Garry <john.garry@...wei.com>, joro@...tes.org,
        will@...nel.org, hch@....de, m.szyprowski@...sung.com,
        chenxiang66@...ilicon.com, thunder.leizhen@...wei.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        liyihang6@...ilicon.com
Subject: Re: [RFC PATCH] dma-iommu: Add iommu_dma_max_mapping_size()

On Tue, May 17, 2022 at 11:40:52AM +0100, Robin Murphy wrote:
> Indeed, sorry but NAK for this being nonsense. As I've said at least once 
> before, if the unnecessary SAC address allocation attempt slows down your 
> workload, make it not do that in the first place. If you don't like the 
> existing command-line parameter then fine, there are plenty of other 
> options, it just needs to be done in a way that doesn't break x86 systems 
> with dodgy firmware, as my first attempt turned out to.

What broke x86?