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 2431DCDB482 for ; Tue, 17 Oct 2023 18:04:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qsoPT-00017v-Gv; Tue, 17 Oct 2023 14:03:15 -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 1qsoPQ-000172-KC; Tue, 17 Oct 2023 14:03:13 -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 1qsoPO-0004mt-G0; Tue, 17 Oct 2023 14:03:12 -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=8Z/G+xXxoqLc1oVYvgSvXAHrzhv9Z4bWUcJP/KnzsOE=; b=jwjtHEO2FKTFm8J9ww6LrJT+yt E/BOdsexhcXeJ5Y4jTgFUTtdgkU/NNVjdzbYPj4hqgtlN2LJuF2ZUbsyTgRTE0FkwkVuvVNoGzofY ZkQcWnhDs9/uMYcNWCdqn9VDMr1GpRCpFjgTZj/mX5pdztpw8V/lSONKCz00mQg1MqUQrH2Y94rQ0 MYe3lZKolFLW9KROvwLV17SURXmGPMD/x15Jw6vKjp4qK42+kdRQeJYuoUX5dgc+pB9uOF1j4FwBE ZzU8LhU+/IXnfq/uH6LBtr+Hwt8riZtIgILaZlsQ92jVBkzmYMiNJQiztEwXGU8QxspAuMOFakbx9 d28vqLJA==; Received: from [2001:8b0:10b:5:b9aa:f92b:5d4c:b38] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qsoP6-00DlaR-Uz; Tue, 17 Oct 2023 18:02:53 +0000 Message-ID: Subject: Re: [PATCH 11/12] hw/xen: automatically assign device index to block devices From: David Woodhouse To: Kevin Wolf Cc: qemu-devel@nongnu.org, Hanna Reitz , Stefano Stabellini , Anthony Perard , Paul Durrant , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Date: Tue, 17 Oct 2023 19:02:52 +0100 In-Reply-To: References: <20231016151909.22133-1-dwmw2@infradead.org> <20231016151909.22133-12-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-g8ymWje5yQdoPBf4P1zh" 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+e442e50539a6073fd887+7359+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 --=-g8ymWje5yQdoPBf4P1zh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-17 at 12:21 +0200, Kevin Wolf wrote: > Am 16.10.2023 um 17:19 hat David Woodhouse geschrieben: > > From: David Woodhouse > >=20 > > There's no need to force the user to assign a vdev. We can automaticall= y > > assign one, starting at xvda and searching until we find the first disk > > name that's unused. > >=20 > > This means we can now allow '-drive if=3Dxen,file=3Dxxx' to work withou= t an > > explicit separate -driver argument, just like if=3Dvirtio. > >=20 > > Signed-off-by: David Woodhouse >=20 > > @@ -34,6 +34,31 @@ static char *xen_block_get_name(XenDevice *xendev, E= rror **errp) > > =C2=A0=C2=A0=C2=A0=C2=A0 XenBlockDevice *blockdev =3D XEN_BLOCK_DEVICE(= xendev); > > =C2=A0=C2=A0=C2=A0=C2=A0 XenBlockVdev *vdev =3D &blockdev->props.vdev; > > =C2=A0 > > +=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 char name[11]; > > +=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 */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 while (disk < (1 << 20)) { >=20 > I like your optimism that we can handle a million disks. :-) Heh, yeah. Given that there *is* a limit, setting it lower seemed a bit arbitrary. For consoles I picked 100 instead of letting it go all the way to INT_MAX, and in a patch set soon to be posted I'll do the same for the xen-net-device as I convert it. Even with a limit of 100, having that many devices *WITHOUT SPECIFYING WHICH ONE IS WHICH* seems a bit many! FWIW I've changed it to check for the existence of the *frontend* nodes (the ones which are visible to the guest). Currently it checks for the backend nodes, but those might be in different places. > I haven't reviewed the Xen part in detail, but the patch looks fine on > the block layer side. >=20 > Acked-by: Kevin Wolf Thanks. --=-g8ymWje5yQdoPBf4P1zh 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 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