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 79184CDB47E for ; Wed, 18 Oct 2023 23:14:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtFjw-0007lV-7f; Wed, 18 Oct 2023 19:14:12 -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 1qtFjt-0007jz-Ce; Wed, 18 Oct 2023 19:14:09 -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 1qtFjr-0004UW-2T; Wed, 18 Oct 2023 19:14:09 -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=N+rErIUncs6vtKxP0tvsUXxfPNPNsSG6K+bG4ccHWoQ=; b=L8zT5Ysz77ILcK2Imkn+hvzcX1 rNRd0JI+Z7mmryrtsSRjU9+fWvzt9qkYWsbHify2sIDXAz+bClZIgQ2tkZ3FN2tF8O2mcDHuXT7lV 9d/Lzkp2TUJ02bbR9jcM2JPSyFn/nQrGUzQ0RF3rlja5wPSPGiMT8b0kd4mcOkap1zRLeS1/R3dYH fR/n02ircWWiB4vTYXz1rh+M8tXorgltDNI1CLlvTh3F9ZY7JWGjtYQ/w/RU1dZwKnQ7lb6WNyZFS oIvdrdYyDIqkVNL9CfSqV00LVQ5+hEzldj/ZrkDy0kvwPHqgY7jCW6nd4JLFwPGYPq5coAVSYlNbM CWYpgNIw==; Received: from [2001:8b0:10b:5:d4f9:734b:fde4:c827] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qtFjk-003eu4-Ne; Wed, 18 Oct 2023 23:14:00 +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: Thu, 19 Oct 2023 00:13:59 +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="=-+tKukLmWCBrrXXnUxLFA" 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+8ac6f4fe82fdef80538c+7360+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 --=-+tKukLmWCBrrXXnUxLFA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-10-18 at 10:52 +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 > Actually, how does this play together with xen_config_dev_blk()? This > looks like it tried to implement a very similar thing (which is IF_XEN > even already existed). >=20 > Are we now trying to attach each if=3Dxen disk twice in the 'xenpv' > machine? Or if something prevents this, is it dead code? >=20 > I think in both cases, we would want to delete that function and remove > the loop that calls it in xen_init_pv()? I tested this with an xl config which looks a bit like this... disk =3D [ "backendtype=3Dqdisk,format=3Dqcow2,vdev=3Dxvda,access=3Drw,targ= et=3D/var/lib/libvirt/images/fedora28.qcow2" ] device_model_override =3D "/home/dwmw2/git/qemu/build/qemu-system-x86_64" device_model_version =3D "qemu-xen" device_model_args =3D [ "-trace","xen*","-chardev","pty,id=3Dmon","-mon","m= on","-drive","file=3D/var/lib/libvirt/images/solaris11.qcow2,format=3Dqcow2= ,if=3Dxen","-nic","user,model=3Dxen" ] The code in xen_config_dev_blk() scribbles over the disk that the toolstack has configured for me, and adds that qcow2 file from the '-drive' option on the command line, but in *raw* mode. Then the new xen-disk support kicks in and finds a free vdev, and adds the -drive properly /dev/xvdb (as qcow2). So v2 of this patch will just rip out xen_config_dev_blk() as you suggest. --=-+tKukLmWCBrrXXnUxLFA 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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