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Date:   Fri, 31 Aug 2018 14:20:34 +0100
From:   Jean-Philippe Brucker <>
To:     Eric Auger <>, "\"",,,,,,,,,, "yi.l.liu\"",,
Subject: Re: [RFC 09/13] iommu/smmuv3: Get prepared for nested stage support

On 23/08/18 13:17, Eric Auger wrote:
>  	if (ste->s1_cfg) {
> -		BUG_ON(ste_live);

Scary! :) The current code assumes that it can make modifications to the
STE in any order and enable translation after a sync. So far I haven't
been able to find anything that violates this rule in the spec: "If
software modifies the structure while it is valid, it must not allow the
structure to enter an invalid intermediate state." So maybe it's fine,
though to be safe I would have started with disabling the STE


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