From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761550AbcLBODd convert rfc822-to-8bit (ORCPT ); Fri, 2 Dec 2016 09:03:33 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:44672 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759485AbcLBODb (ORCPT ); Fri, 2 Dec 2016 09:03:31 -0500 Subject: Re: [PATCH 2/8] x86/head: Refactor 32-bit pgtable setup To: Ingo Molnar References: <1476468318-24422-1-git-send-email-boris.ostrovsky@oracle.com> <1476468318-24422-3-git-send-email-boris.ostrovsky@oracle.com> <0b9894e4-753c-7e49-45a7-3ee5e82abe3e@oracle.com> <03294a9e-63b2-3cea-2dfe-808190f6fa0e@oracle.com> <20161202094554.GA28775@gmail.com> Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , david.vrabel@citrix.com, JGross@suse.com, roger.pau@citrix.com, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, Matt Fleming From: Boris Ostrovsky Message-ID: Date: Fri, 2 Dec 2016 09:04:41 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <20161202094554.GA28775@gmail.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8BIT X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/02/2016 04:45 AM, Ingo Molnar wrote: > * Boris Ostrovsky wrote: > >> On 10/31/2016 08:33 AM, Boris Ostrovsky wrote: >>> >>> On 10/14/2016 02:05 PM, Boris Ostrovsky wrote: >>>> From: Matt Fleming >>>> >>>> The new Xen PVH entry point requires page tables to be setup by the >>>> kernel since it is entered with paging disabled. >>>> >>>> Pull the common code out of head_32.S and into pgtable_32.S so that >>>> setup_pgtable_32 can be invoked from both the new Xen entry point and >>>> the existing startup_32 code. >>> >>> Ping to x86 maintainers. >> Pinging again. >> >> I will be re-sending this series at some point (it has been delayed by >> some hypervisor changes that will be needed) but I'd like to hear from >> x86 maintainers whether this will be acceptable before I post this again. > Could this be done in C? I suppose it could be, I haven't thought about it. The goal here was to simply make existing startup code available to others (Xen guest) without changes. Are you suggesting to build page tables in C for the Xen guest only or to make startup_32 call new C code as well? -boris