Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751492Ab3FYT2k (ORCPT ); Tue, 25 Jun 2013 15:28:40 -0400 Received: from mail-ie0-f172.google.com ([209.85.223.172]:33947 "EHLO mail-ie0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751195Ab3FYT2j (ORCPT ); Tue, 25 Jun 2013 15:28:39 -0400 MIME-Version: 1.0 In-Reply-To: <51C9EADD.5000904@zytor.com> References: <1371831934-156971-1-git-send-email-nzimmer@sgi.com> <20130621165142.GA32125@kroah.com> <51C48745.9030304@zytor.com> <20130621185056.GA23473@kroah.com> <51C4C5F3.3050800@sgi.com> <51C9D4ED.5070805@sgi.com> <51C9DEC1.6030602@zytor.com> <51C9E523.7000803@zytor.com> <51C9E83A.8070700@sgi.com> <51C9EADD.5000904@zytor.com> Date: Tue, 25 Jun 2013 12:28:38 -0700 X-Google-Sender-Auth: dAESfGFP0UAhO8qRXEeLaZSX3YE Message-ID: Subject: Re: [RFC 0/2] Delay initializing of large sections of memory From: Yinghai Lu To: "H. Peter Anvin" Cc: Mike Travis , Ingo Molnar , Greg KH , Nathan Zimmer , Robin Holt , Rob Landley , Thomas Gleixner , Andrew Morton , "the arch/x86 maintainers" , linux-doc@vger.kernel.org, Linux Kernel Mailing List Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 697 Lines: 18 On Tue, Jun 25, 2013 at 12:09 PM, H. Peter Anvin wrote: >> According to Intel SDM, CPU could support 52bits physical addressing. >> >> So how linux kernel will handle it? as we only have 48bits virtual addressing. >> > > The Linux kernel will not support more than V-2 bits of physical address > space for any number V of virtual address bits. ok, then will need cpu support 57bits virtual addressing, and level 5 page table? Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/