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 631DDC25B67 for ; Fri, 27 Oct 2023 08:46:02 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qwITc-0008PK-EV; Fri, 27 Oct 2023 04:45:56 -0400 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 1qwITZ-0008M2-N7; Fri, 27 Oct 2023 04:45:53 -0400 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 1qwITW-0002SQ-RC; Fri, 27 Oct 2023 04:45:53 -0400 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=CCdva9oSf6tY28xy4tw/eAe0/f89vRQdMgzrW7dc0zY=; b=au624mjryRC71K4dqNzr6vEYpR i1VIwJKppRlM9F6K/FwEsGV2eGhonrk7KcXxOEXceXYYeVOasMOo89HuHMbsG81hXpUquEzvVCZYM B7xckI19v8r+eJddZWoPRM61S01rq2RwVA3kdZjNoZTLWVkvhWTrhsasaC2MC3meB+3j4SJos4nOv gTLaMd6486/DkrO5ktJJxuZKrFxgsTSG3eApBGyS5lCwpUZzUG8qstCAQ6LycGWxUOrwX+bflEF9E q2mb006FGrAKrTudsj5LgBnsoan5a/6IwYEbm6+k7a3i6MQYzXX0qKVHT4SvOsgskQqNjGjG0D+IO Of2zQx5w==; Received: from [2001:8b0:10b:5:a059:f7a9:933a:2236] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qwITM-002Slx-6X; Fri, 27 Oct 2023 08:45:42 +0000 Message-ID: Subject: Re: [PATCH v3 13/28] hw/xen: automatically assign device index to block devices From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Jason Wang , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Date: Fri, 27 Oct 2023 09:45:39 +0100 In-Reply-To: <74e54da5-9c35-485d-a13c-efac3f81dec2@gmail.com> References: <20231025145042.627381-1-dwmw2@infradead.org> <20231025145042.627381-14-dwmw2@infradead.org> <74e54da5-9c35-485d-a13c-efac3f81dec2@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OZZWwwyLPIuvpVYNOyoh" 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+92d2995e4a7c3d3365be+7369+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 --=-OZZWwwyLPIuvpVYNOyoh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-10-27 at 08:30 +0100, Durrant, Paul wrote: >=20 > > +=C2=A0=C2=A0=C2=A0 if (blockdev->props.vdev.type =3D=3D XEN_BLOCK_VDEV= _TYPE_INVALID) { > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 XenBus *xenbus =3D XEN_BUS(= qdev_get_parent_bus(DEVICE(xendev))); > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 char fe_path[XENSTORE_ABS_P= ATH_MAX + 1]; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 char *value; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int disk =3D 0; > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unsigned long idx; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Find an unoccupied devic= e name */ >=20 > Not sure this is going to work is it? What happens if 'hda' or 'sda', or= =20 > 'd0' exists? I think you need to use the core of the code in=20 > xen_block_set_vdev() to generate names and search all possible encodings= =20 > for each disk. Do we care? You're allowed to have *all* of "hda", "sda" and "xvda" at the same time. If a user explicitly provides "sda" and then provides another disk without giving it a name, we're allowed to use "xvda". Hell, you can also have *separate* backing stores provided as "hda1", "sda1" and "xvda1". I *might* have tolerated a heckle that this function should check for at least the latter of those, but when I was first coding it up I was more inclined to argue "Don't Do That Then". --=-OZZWwwyLPIuvpVYNOyoh 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 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