From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 066EE1A0664 for ; Mon, 22 Feb 2016 15:56:01 +1100 (AEDT) Received: from e19.ny.us.ibm.com (e19.ny.us.ibm.com [129.33.205.209]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 1DF7C140BEB for ; Mon, 22 Feb 2016 15:55:59 +1100 (AEDT) Received: from localhost by e19.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 21 Feb 2016 23:55:57 -0500 From: "Aneesh Kumar K.V" To: Paul Mackerras , linuxppc-dev@ozlabs.org Subject: Re: [PATCH 3/9] powerpc/mm/book3s-64: Use physical addresses in upper page table tree levels In-Reply-To: <1456108880-27464-4-git-send-email-paulus@ozlabs.org> References: <1456108880-27464-1-git-send-email-paulus@ozlabs.org> <1456108880-27464-4-git-send-email-paulus@ozlabs.org> Date: Mon, 22 Feb 2016 10:25:51 +0530 Message-ID: <871t85finc.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Paul Mackerras writes: > From: Paul Mackerras > > This changes the Linux page tables to store physical addresses > rather than kernel virtual addresses in the upper levels of the > tree (pgd, pud and pmd) for 64-bit Book 3S machines. > > This frees up some high order bits, and will be needed with > PowerISA v3.0 machines which read the page table tree in hardware > in radix mode. How about hugepd pointer with 4k linux page size ? -aneesh