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Subject: Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory
 Encryption
References: <20170418211612.10190.82788.stgit@tlendack-t1.amdoffice.net>
 <20170418212212.10190.73484.stgit@tlendack-t1.amdoffice.net>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <1498ec98-b19d-c47d-902b-a68870a3f860@intel.com>
Date: Fri, 21 Apr 2017 14:55:13 -0700
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To: Tom Lendacky <thomas.lendacky@amd.com>, linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org
Cc: Rik van Riel <riel@redhat.com>, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Toshimitsu Kani <toshi.kani@hpe.com>, Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>, Matt Fleming <matt@codeblueprint.co.uk>, "Michael S. Tsirkin" <mst@redhat.com>, Joerg Roedel <joro@8bytes.org>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Paolo Bonzini <pbonzini@redhat.com>, Larry Woodman <lwoodman@redhat.com>, Brijesh Singh <brijesh.singh@amd.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>, Dave Young <dyoung@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, Dmitry Vyukov <dvyukov@google.com>

On 04/18/2017 02:22 PM, Tom Lendacky wrote:
> Add sysfs support for SME so that user-space utilities (kdump, etc.) can
> determine if SME is active.
> 
> A new directory will be created:
>   /sys/kernel/mm/sme/
> 
> And two entries within the new directory:
>   /sys/kernel/mm/sme/active
>   /sys/kernel/mm/sme/encryption_mask

Why do they care, and what will they be doing with this information?

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