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 C2873C4332F for ; Mon, 13 Nov 2023 17:12:19 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r2aTL-0001dc-08; Mon, 13 Nov 2023 12:11:39 -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 1r2aTJ-0001cx-Bg; Mon, 13 Nov 2023 12:11:37 -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 1r2aTF-0005gN-U4; Mon, 13 Nov 2023 12:11:37 -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=Kg7Lk6mtqkME9quq+3EpIXzjCOe+B6UXUNlMqhOIiPo=; b=jszoUdoorB1TbqvV17TAGouXOn ES40E6cFgunVCx0u/Nm0DTcQa/inw4Jb66WgzEkoCqOcxX+s5Yphkr2zGf396LqziaHwmc+O+LCcn 6Ay1qAzJgz99g9+zjH3LYDUdviTaH64XNYnVMsu3eb3E7BX54004pe3kJGoGcEjvsd92OLKIVE/UF Z8m1xw1hoF4A3ubqfoCxeROphpxjDMOKiwcRlmi6kR8TcJ85EsYFMJbgMY1h6afMpWbYnpe8R8v14 0xGusqnsYS5IUKl/+9GtSMlINaXBmhKY9RGuruHxNLRfF/SYul2QXmO5ieS9XPIzeGEkPEaw5XWFn 2dmUc/8Q==; Received: from [12.186.190.1] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r2aSw-00FR8w-S3; Mon, 13 Nov 2023 17:11:15 +0000 Message-ID: Subject: Re: [PATCH-for-9.0 04/10] hw/xen: Factor xen_arch_align_ioreq_data() out of handle_ioreq() From: David Woodhouse To: Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= Cc: "qemu-devel@nongnu.org" , "Michael S. Tsirkin" , Alex =?ISO-8859-1?Q?Benn=E9e?= , Anthony Perard , "xen-devel@lists.xenproject.org" , Stefano Stabellini , "qemu-block@nongnu.org" , Thomas Huth , Paolo Bonzini , "qemu-arm@nongnu.org" , Paul Durrant , Peter Maydell , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum Date: Mon, 13 Nov 2023 12:11:11 -0500 In-Reply-To: <7a66c289-19e1-4690-8c6e-31a9f6344b6f@linaro.org> References: <7a66c289-19e1-4690-8c6e-31a9f6344b6f@linaro.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-zJAegOARyT6uOPwd81fO" User-Agent: Evolution 3.44.4-0ubuntu2 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+4b2d4fa8b3c13737bab4+7386+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, T_SCC_BODY_TEXT_LINE=-0.01 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 --=-zJAegOARyT6uOPwd81fO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-11-13 at 17:09 +0100, Philippe Mathieu-Daud=C3=A9 wrote: > On 13/11/23 16:58, Woodhouse, David wrote: > > On 13 Nov 2023 10:22, Philippe Mathieu-Daud=C3=A9 > > wrote: > >=20 > > =C2=A0=C2=A0=C2=A0 Per commit f17068c1c7 ("xen-hvm: reorganize xen-hvm = and move > > common > > =C2=A0=C2=A0=C2=A0 function to xen-hvm-common"), handle_ioreq() is expe= cted to be > > =C2=A0=C2=A0=C2=A0 target-agnostic. However it uses 'target_ulong', whi= ch is a > > target > > =C2=A0=C2=A0=C2=A0 specific definition. > >=20 > > =C2=A0=C2=A0=C2=A0 In order to compile this file once for all targets, = factor the > > =C2=A0=C2=A0=C2=A0 target-specific code out of handle_ioreq() as a per-= target > > handler > > =C2=A0=C2=A0=C2=A0 called xen_arch_align_ioreq_data(). > >=20 > > =C2=A0=C2=A0=C2=A0 Signed-off-by: Philippe Mathieu-Daud=C3=A9 > > =C2=A0=C2=A0=C2=A0 --- > > =C2=A0=C2=A0=C2=A0 Should we have a 'unsigned qemu_target_long_bits();'= helper > > =C2=A0=C2=A0=C2=A0 such qemu_target_page_foo() API and target_words_big= endian()? > >=20 > >=20 > > It can be more fun than that though. What about=20 > > qemu_target_alignof_uint64() for example, which differs between > > i386 and=20 > > x86_64 and causes even structs with *explicitly* sized fields to > > differ=20 > > because of padding. > >=20 > > I'd *love* to see this series as a step towards my fantasy of being > > able=20 > > to support Xen under TCG. After all, without that what's the point > > in=20 > > being target-agnostic? >=20 > Another win is we are building all these files once instead of one > for > each i386/x86_64/aarch64 targets, so we save CI time and Amazon > trees. >=20 > > However, I am mildly concerned that some of these files are > > accidentally=20 > > using the host ELF ABI, perhaps with explicit management of 32-bit=20 > > compatibility, and the target-agnosticity is purely an illusion? > >=20 > > See the "protocol" handling and the three ABIs for the ring in=20 > > xen-block, for example. >=20 > If so I'd expect build failures or violent runtime assertions. Heh, mostly the guest just crashes in the cases I've seen so far. See commit a1c1082908d ("hw/xen: use correct default protocol for xen- block on x86"). > Reviewing quickly hw/block/dataplane/xen-block.c, this code doesn't > seem target specific at all IMHO. Otherwise I'd really expect it to > fail compiling. But I don't know much about Xen, so I'll let block & > xen experts to have a look. Where it checks dataplane->protocol and does different things for BLKIF_PROTOCOL_NATIVE/BLKIF_PROTOCOL_X86_32/BLKIF_PROTOCOL_X86_64, the *structures* it uses are intended to be using the correct ABI. I think the structs for BLKIF_PROTOCOL_NATIVE may actually be *different* according to the target, in theory? I don't know that they are *correct* right now, if the host is different from the target. But that's just a bug (that only matters if we ever want to support Xen-compatible guests using TCG). > > Can we be explicit about what's expected to work here and what's > > not in scope? >=20 > What do you mean? Everything is expected to work like without this > series applied :) I think that if we ever do support Xen-compatible guests using TCG, we'll have to fix that bug and use the right target-specific structures... and then perhaps we'll want the affected files to actually become target-specfic again? I think this series makes it look like target-agnostic support *should* work... but it doesn't really? --=-zJAegOARyT6uOPwd81fO Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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