linux-kernel - Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

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Date:   Wed, 25 Nov 2020 14:05:15 +0000
From:   Will Deacon <will@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Ning Sun <ning.sun@...el.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        tboot-devel@...ts.sourceforge.net,
        Adrian Huang <ahuang12@...ovo.com>,
        iommu@...ts.linux-foundation.org, Ashok Raj <ashok.raj@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86/tboot: Don't disable swiotlb when iommu is forced on

On Wed, 25 Nov 2020 09:41:24 +0800, Lu Baolu wrote:
> After commit 327d5b2fee91c ("iommu/vt-d: Allow 32bit devices to uses DMA
> domain"), swiotbl could also be used for direct memory access if IOMMU
> is enabled but a device is configured to pass through the DMA translation.
> Keep swiotlb when IOMMU is forced on, otherwise, some devices won't work
> if "iommu=pt" kernel parameter is used.

Applied to arm64 (for-next/iommu/fixes), thanks!

[1/1] x86/tboot: Don't disable swiotlb when iommu is forced on
      https://git.kernel.org/arm64/c/e2be2a833ab5

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev