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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20201125154153.GA29929@localhost.localdomain>
Date:   Wed, 25 Nov 2020 10:41:53 -0500
From:   Konrad Rzeszutek Wilk <konrad@...nok.org>
To:     Will Deacon <will@...nel.org>
Cc:     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>,
        catalin.marinas@....com, kernel-team@...roid.com, 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, Nov 25, 2020 at 02:05:15PM +0000, Will Deacon wrote:
> 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

But tboot never ran on ARM. It is a Intel specifc.

I think either me or Thomas should take this patch.