linux-kernel - Re: [PATCH v2 20/24] iommu: Merge strictness and domain type configs

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Message-ID: <a30a4d50-e798-c2d1-73a3-5b53fef2f75f@huawei.com>
Date:   Fri, 30 Jul 2021 10:33:31 +0100
From:   John Garry <john.garry@...wei.com>
To:     Robin Murphy <robin.murphy@....com>, <joro@...tes.org>,
        <will@...nel.org>
CC:     <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <suravee.suthikulpanit@....com>,
        <baolu.lu@...ux.intel.com>, <dianders@...omium.org>
Subject: Re: [PATCH v2 20/24] iommu: Merge strictness and domain type configs

On 28/07/2021 16:58, Robin Murphy wrote:
>   
> -config IOMMU_DEFAULT_LAZY
> -	bool "lazy"
> +	  Untrusted devices always use this mode, with an additional layer of
> +	  bounce-buffering such that they cannot gain access to any unrelated
> +	  data within a mapped page.
> +
> +config IOMMU_DEFAULT_DMA_LAZY
> +	bool "Translated - Lazy"
>   	help

Since these are being renamed, can you update the kernel-parameters.txt:


	iommu.strict=	[ARM64, X86] Configure TLB invalidation behaviour


....
		  DMA unmap operations invalidate IOMMU hardware TLBs
		  synchronously.
		unset - Use value of CONFIG_IOMMU_DEFAULT_{LAZY,STRICT}.

					^^^^^

Thanks