Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753538AbdIDMYF (ORCPT ); Mon, 4 Sep 2017 08:24:05 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:33731 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753477AbdIDMYB (ORCPT ); Mon, 4 Sep 2017 08:24:01 -0400 X-Google-Smtp-Source: ADKCNb6qBaoFpJxsnLEC2BcxEeyST+IkkfLAR/nqsLtc1STFg69fqkh/8L5f6uaYRcfUV+zl5Jl+/w== Date: Mon, 4 Sep 2017 15:23:58 +0300 From: "Kirill A. Shutemov" To: Ingo Molnar Cc: Linus Torvalds , linux-kernel@vger.kernel.org, Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Andrew Morton , Andy Lutomirski , Borislav Petkov Subject: Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support Message-ID: <20170904122358.uscplql7tzrnimp4@node.shutemov.name> References: <20170904093158.k6pg3ytcbotjlhv5@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170904093158.k6pg3ytcbotjlhv5@gmail.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 574 Lines: 15 On Mon, Sep 04, 2017 at 11:31:58AM +0200, Ingo Molnar wrote: > The main changes in this cycle are support for three new, complex hardware > features of x86 CPUs: > > - Add 5-level paging support, which is a new hardware feature on upcoming Intel > CPUs allowing up to 128 PB of virtual address space and 4 PB of physical RAM > space - a 256-fold increase over the old limits. Minor nitpick: I don't see where "256-fold" comes from. Virtual address space increased from 256 TB to 128 PB -- 512 times. Physical: 64 TB -> 4 PB -- 64 times. -- Kirill A. Shutemov