linux-kernel - Re: [PATCH v6 26/34] iommu/amd: Allow the AMD IOMMU to work with memory encryption

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Message-ID: <C1A52990-84AA-4258-B864-0121F5F5C4B5@oracle.com>
Date:   Thu, 15 Jun 2017 16:13:29 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Borislav Petkov <bp@...en8.de>,
        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,
        kexec@...ts.infradead.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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v6 26/34] iommu/amd: Allow the AMD IOMMU to work with memory encryption

On June 15, 2017 11:33:22 AM EDT, Borislav Petkov <bp@...en8.de> wrote:
>On Thu, Jun 15, 2017 at 09:59:45AM -0500, Tom Lendacky wrote:
>> Actually the detection routine, amd_iommu_detect(), is part of the
>> IOMMU_INIT_FINISH macro support which is called early through
>mm_init()
>> from start_kernel() and that routine is called before init_amd().
>
>Ah, we do that there too:
>
>	for (p = __iommu_table; p < __iommu_table_end; p++) {
>
>Can't say that that code with the special section and whatnot is
>obvious. :-\
>

Patches to make it more obvious would be always welcome!



Thanks!