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Subject: Re: [PATCH v2 20/24] iommu: Merge strictness and domain type configs
To:     Robin Murphy <robin.murphy@arm.com>, <joro@8bytes.org>,
        <will@kernel.org>
CC:     <iommu@lists.linux-foundation.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <suravee.suthikulpanit@amd.com>,
        <baolu.lu@linux.intel.com>, <dianders@chromium.org>
References: <cover.1627468308.git.robin.murphy@arm.com>
 <992b2952f0b173411c7b6f221dce82e8e082c0b8.1627468310.git.robin.murphy@arm.com>
From:   John Garry <john.garry@huawei.com>
Message-ID: <a30a4d50-e798-c2d1-73a3-5b53fef2f75f@huawei.com>
Date:   Fri, 30 Jul 2021 10:33:31 +0100
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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