linux-kernel - Re: [PATCH] iommu: Update "iommu.strict" documentation

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Date:   Mon, 14 Jun 2021 17:29:31 +0100
From:   John Garry <john.garry@...wei.com>
To:     Robin Murphy <robin.murphy@....com>, <joro@...tes.org>
CC:     <will@...nel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH] iommu: Update "iommu.strict" documentation

On 14/06/2021 15:57, Robin Murphy wrote:
> Consolidating the flush queue logic also meant that the "iommu.strict"
> option started taking effect on x86 as well. Make sure we document that.
> 
> Fixes: a250c23f15c2 ("iommu: remove DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE")
> Signed-off-by: Robin Murphy <robin.murphy@....com>

I assumed that all bets were off when we use a cmdline param which is 
not "officially" supported.

Anyway, FWIW:
Reviewed-by: John Garry <john.garry@...wei.com>

> ---
>   Documentation/admin-guide/kernel-parameters.txt | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index cb89dbdedc46..20a32de990ed 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1987,7 +1987,7 @@
>   			  forcing Dual Address Cycle for PCI cards supporting
>   			  greater than 32-bit addressing.
>   
> -	iommu.strict=	[ARM64] Configure TLB invalidation behaviour
> +	iommu.strict=	[ARM64, X86] Configure TLB invalidation behaviour
>   			Format: { "0" | "1" }
>   			0 - Lazy mode.
>   			  Request that DMA unmap operations use deferred