linux-kernel - iommu non-strict mode for arm64

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Message-ID: <20220204054616.cfqhygo3v7amrzvp@treble>
Date:   Thu, 3 Feb 2022 21:46:16 -0800
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: iommu non-strict mode for arm64

Hi all,

We've gotten significant slowdowns on arm64 with 4k pages compared to
64k.  The slowdowns can be alleviated by setting iommu.strict=0 or
iommu.passthrough=1.

Is there a reason x86 defaults to lazy iommu, while arm64 does not?  Are
there security implications which are specific to arm64?

-- 
Josh