linux-kernel - Re: [RFC PATCH v4 19/28] swiotlb: Add warnings for use of bounce buffers with SME

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Message-ID: <20170301111737.z3bwfpdoj7ndzmyd@pd.tnic>
Date:   Wed, 1 Mar 2017 12:17:37 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Larry Woodman <lwoodman@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v4 19/28] swiotlb: Add warnings for use of bounce
 buffers with SME

On Tue, Feb 28, 2017 at 05:19:51PM -0600, Tom Lendacky wrote:
> Device drivers don't supply set_dma_mask() since that is part of the
> dma_map_ops structure. The fm10k_pf.c file function is unrelated to this
> (it's part of an internal driver structure). The dma_map_ops structure
> is setup by the arch or an iommu.

That was certainly a brainfart, sorry.

Joerg explained to me on IRC how the whole dma_map_ops handling is
supposed to be happening.

Thanks.

-- 
Regards/Gruss,
    Boris.

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