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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id m9si13385680pgq.373.2019.07.14.11.16.52 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 14 Jul 2019 11:16:52 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=EzYn0T6m; spf=pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=rdunlap@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To: Subject:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=zu9VDO3r7C4z6bPiJPIw5Tkj2wZpny80iXDdtymKYFo=; b=EzYn0T6mC7FKpTJ8RU1irxwHC abpmpCrn+ITOcYgj8BJxZSu6aQ8Ii0YPXkA/exU0YQAy7O0m7+zOGJ3xNtG1HVipow4mEY+2R1QFW yUWv1Dom4OKQzrTOt/MbgsA7dNej/caTkqZhPY4jTEfuejInIA0Otu3kOtE0Y3OFmGhYzyRNA53ot 8i1Xw/ye+rilRjaF2MiA8RFIjxQIlV1yRtosHFLPp461r/jWR4weAEdfgWYgXPKwsg7h9oaNby5Uw Fhn/WXJUh22ci0+2oOYbAzeIHC8bxLEX5nMuy4O4wttLhW0+1HBbETWT8w+KVWUyajs2GLcky3C/l obC02yThg==; Received: from static-50-53-52-16.bvtn.or.frontiernet.net ([50.53.52.16] helo=[192.168.1.17]) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hmj3K-000704-J9; Sun, 14 Jul 2019 18:16:50 +0000 Subject: Re: [PATCH, RFC 57/62] x86/mktme: Overview of Multi-Key Total Memory Encryption To: "Kirill A. Shutemov" , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , David Howells Cc: Kees Cook , Dave Hansen , Kai Huang , Jacob Pan , Alison Schofield , linux-mm@kvack.org, kvm@vger.kernel.org, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org References: <20190508144422.13171-1-kirill.shutemov@linux.intel.com> <20190508144422.13171-58-kirill.shutemov@linux.intel.com> From: Randy Dunlap Message-ID: Date: Sun, 14 Jul 2019 11:16:49 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190508144422.13171-58-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 5/8/19 7:44 AM, Kirill A. Shutemov wrote: > From: Alison Schofield > > Provide an overview of MKTME on Intel Platforms. > > Signed-off-by: Alison Schofield > Signed-off-by: Kirill A. Shutemov > --- > Documentation/x86/mktme/index.rst | 8 +++ > Documentation/x86/mktme/mktme_overview.rst | 57 ++++++++++++++++++++++ > 2 files changed, 65 insertions(+) > create mode 100644 Documentation/x86/mktme/index.rst > create mode 100644 Documentation/x86/mktme/mktme_overview.rst > diff --git a/Documentation/x86/mktme/mktme_overview.rst b/Documentation/x86/mktme/mktme_overview.rst > new file mode 100644 > index 000000000000..59c023965554 > --- /dev/null > +++ b/Documentation/x86/mktme/mktme_overview.rst > @@ -0,0 +1,57 @@ > +Overview > +========= ... > +-- > +1. https://software.intel.com/sites/default/files/managed/a5/16/Multi-Key-Total-Memory-Encryption-Spec.pdf > +2. The MKTME architecture supports up to 16 bits of KeyIDs, so a > + maximum of 65535 keys on top of the “TME key” at KeyID-0. The > + first implementation is expected to support 5 bits, making 63 Hi, How do 5 bits make 63 keys available? > + keys available to applications. However, this is not guaranteed. > + The number of available keys could be reduced if, for instance, > + additional physical address space is desired over additional > + KeyIDs. thanks. -- ~Randy