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

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To: Tom Lendacky <thomas.lendacky@xxxxxxx>
Subject: Re: [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory encryption is active
From: Joerg Roedel <joro@xxxxxxxxxx>
Date: Mon, 14 Nov 2016 17:32:04 +0100
Cc: linux-arch@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Rik van Riel <riel@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Larry Woodman <lwoodman@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
In-reply-to: <20161110003731.3280.67205.stgit@tlendack-t1.amdoffice.net>
User-agent: Mutt/1.5.21 (2010-09-15)

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.


Thanks,

	Joerg

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Follow-Ups:
- Re: [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory encryption is active
  - From: Tom Lendacky

References:
- [RFC PATCH v3 00/20] x86: Secure Memory Encryption (AMD)
  - From: Tom Lendacky
- [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory encryption is active
  - From: Tom Lendacky

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