From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 49A83C4332F for ; Tue, 20 Dec 2022 23:46:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p7mIh-0005z0-Mv; Tue, 20 Dec 2022 18:45:36 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p7mIe-0005yY-9Z for qemu-devel@nongnu.org; Tue, 20 Dec 2022 18:45:32 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p7mIb-0005iS-BO for qemu-devel@nongnu.org; Tue, 20 Dec 2022 18:45:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=PWxnb0c5/ntbmKt2TvHj3P9+etMsapiIofHc5BneyuE=; b=WpmHb3bm3ZxrbACFafdlJttE0U Ty0ESMTU0doSTx7ie5cdKTDPAl9ocLCzjHGiiwT7y5jjeX+NepTUhwDKge3R9Fba389t0DNJ6J5qF UrvQEq6G5V8uXnPbsADv/r3sg5USHgPKTFIbD2HrANs9qFmGnRvyMBkHJ3jwfoON4qyyU61sgAX89 Jj8UNCg0GknE4mogStZZpMLkC7lgJSVW91IB6ImgDN4myZm+A5eX3y4fOConQE1+pIjWdV/KaR9Jh oxog/cacFQKj5nzn59z9Bp5QGl4139pljmUCjhDPd1RewboYoRX0mts04Kmrqg9Pq8poBf5FJEpgN oUZ+Ubvw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p7mId-002HEh-FJ; Tue, 20 Dec 2022 23:45:31 +0000 Message-ID: Subject: Re: [Qemu-devel] [PATCH] Remove restriction that prevents bootimg elf64 images From: David Woodhouse To: Anatol Pomozov , qemu-devel@nongnu.org, Adam Lackorzynski Cc: Goswin von Brederlow Date: Tue, 20 Dec 2022 23:45:20 +0000 In-Reply-To: References: <20170607044148.10481-1-anatol.pomozov@gmail.com> <20170608204116.svjgt323qrbghyku@os.inf.tu-dresden.de> <20170619210807.ejwk5zfe2f4g5znw@os.inf.tu-dresden.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vutbipsPrx8qkWb3aZtq" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+3d4d80a81840c180149e+7058+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-vutbipsPrx8qkWb3aZtq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2017-06-21 at 13:45 -0700, Anatol Pomozov wrote: > Hi Adam, thank you for your reply. >=20 > On Mon, Jun 19, 2017 at 2:08 PM, Adam Lackorzynski > wrote: > > Hi, > >=20 > > On Tue Jun 13, 2017 at 17:05:41 -0700, Anatol Pomozov wrote: > > > Do these arguments sound reasonable to apply the patch? > >=20 > > I'm not really convinced. > >=20 > > > On Thu, Jun 8, 2017 at 2:07 PM, Anatol Pomozov wrote: > > > > +reply-all > > > >=20 > > > > On Thu, Jun 8, 2017 at 1:41 PM, Adam Lackorzynski > > > > wrote: > > > > >=20 > > > > > On Tue Jun 06, 2017 at 21:41:48 -0700, Anatol Pomozov wrote: > > > > > > It is possible to create a 64 bit elf image that has valid mult= iboot header. > > > > > > qemu should be able to boot such images. > > > > >=20 > > > > > But this 64bit image actually starts with 32bit code, right? > > > >=20 > > > > Correct. The very first part of the startup code has to be 32bit. > > > > After it sets "long mode" it can use 64bit instructions. To make su= re > > > > that the preamble has only 32bit instructions one have to use asm > > > > directive such as ".code32". > > > >=20 > > > > Here is an example from LitleKernel sturtup code: > > > >=20 > > > > https://github.com/littlekernel/lk/blob/master/arch/x86/64/start.S#= L50 > > > >=20 > > > > .code32 tells assembler to treat following text as 32 bit code. And > > > > later when it jumps into "long mode" > > > >=20 > > > > https://github.com/littlekernel/lk/blob/master/arch/x86/64/start.S#= L214 > > > > one can use 64bit code. > > > >=20 > > > > > So it's a 32bit program and the check verifies that this is the c= ase. > > > >=20 > > > > While preamble have to contain 32 only instructions the rest of the > > > > image can perfectly contain 64bit code. Right now 64bit binary cann= ot > > > > be run with "qemu-system-x86_64 -kernel". But the same binary runs > > > > fine if packed with GRUB as iso. > > > >=20 > > > > I tried to hack around this restriction by adding > > > > "OUTPUT_FORMAT(elf32-i386)" to the linker file and compiling projec= t > > > > with 64bit support. But GNU ld program crashed at Ubuntu 14.04. It > > > > means not that many people use this code path. GNU ld compiled from > > > > HEAD does not have this problem but now GDB is confused by the fact > > > > that ELF contains 64bit code while header reports i386. > >=20 > > That's unfortunate. > >=20 > > > > Practically there is no reason for this check as it prevents runnin= g > > > > 64bit binaries with "qemu-system-x86_64 -kernel". > >=20 > > One reason for the check is that it prevents that one loads a 64bit ELF > > binary that then fails strangely because it does not have the magic > > 32bit code to set up things. >=20 > I would not call the 32bit preamble a magic - it is fairly well > documented; it is just a result of backward compatibility that > AMD/Intel carry for a long time. Every single 64-bit operation system > (Linux, Windows, FreeBSD, ...) has such 32bit init sequence. FWIW, Anatol's patch also makes it possible for qemu to load the 64-bit Xen XTF tests. 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