linux-kernel - Re: [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory encryption is active

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Message-ID: <b4403b85-42dd-66b2-bde6-726c6ac5ae0e@amd.com>
Date:   Mon, 14 Nov 2016 10:48:52 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Joerg Roedel <joro@...tes.org>
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>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory
 encryption is active

On 11/14/2016 10:32 AM, Joerg Roedel wrote:
> On Wed, Nov 09, 2016 at 06:37:32PM -0600, Tom Lendacky wrote:
>> +	/* For now, disable the IOMMU if SME is active */
>> +	if (sme_me_mask)
>> +		return -ENODEV;
>> +
> 
> Please print a message here telling the user why the IOMMU got disabled.

Will do.

Thanks,
Tom

> 
> 
> Thanks,
> 
> 	Joerg
>