Date: Mon, 14 Nov 2016 17:32:04 +0100
From: Joerg Roedel <joro@8bytes.org>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
        kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
        linux-mm@kvack.org, iommu@lists.linux-foundation.org,
        Rik van Riel <riel@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Larry Woodman <lwoodman@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Dmitry Vyukov <dvyukov@google.com>
Subject: Re: [RFC PATCH v3 14/20] iommu/amd: Disable AMD IOMMU if memory
 encryption is active
Message-ID: <20161114163204.GA2078@8bytes.org>
References: <20161110003426.3280.2999.stgit@tlendack-t1.amdoffice.net>
 <20161110003731.3280.67205.stgit@tlendack-t1.amdoffice.net>
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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