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 1D0BCC61D97 for ; Wed, 22 Nov 2023 23:04:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r5wGZ-0002mw-DL; Wed, 22 Nov 2023 18:04:19 -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 1r5wGY-0002mk-O4; Wed, 22 Nov 2023 18:04:18 -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 1r5wGW-000226-Ug; Wed, 22 Nov 2023 18:04:18 -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=cWlNBEZuUOwNyxaNA4RsifPBZBH2WUyoII676qWcvuw=; b=sAr7VxAOlc+yi6pUViPxiVfDjA lwFlbC/T/320HBvZTVzCcRTXrfOYvctH23KP+B5BPrpsR9wO4/el9qn5LtzXNw3hBXoC1iIPFaIil GOEaRt5kALOUawBx5Uaptw+yKxB3h4hIU/Dvn9jahWNdOxOThk13RlAvxeM6cHrtPJIOxpA6A3nfA hitRkdfg4it4h+IBP+2KttEC0ZLJqBTRjB8t7YolOmAvNItk6W2o3spT2VvyC6TFyD+YRTLmBZVlP KoqRTU1Cb/b2ESaiZvgESeTUOPKiVaP6BT5+LPk5yYN5PsoyFiO1E8Y2pIxKbEtv/ssEmSUY31y2Q HTT8TwdA==; Received: from [2001:8b0:10b:5:aa35:270f:6b3d:6d64] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r5wGT-006vLJ-EH; Wed, 22 Nov 2023 23:04:13 +0000 Message-ID: <67e06eae161072e05f4b0990dbde1da869241670.camel@infradead.org> Subject: Re: [PATCH v2 1/6] hw/xen: Set XenBackendInstance in the XenDevice before realizing it From: David Woodhouse To: Volodymyr Babchuk , "paul@xen.org" Cc: "qemu-devel@nongnu.org" , Stefano Stabellini , Julien Grall , Anthony Perard , Kevin Wolf , Hanna Reitz , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , Jason Wang , "open list:Block layer core" , "xen-devel@lists.xenproject.org" Date: Wed, 22 Nov 2023 23:04:12 +0000 In-Reply-To: <878r6p1jp2.fsf@epam.com> References: <20231121221023.419901-1-volodymyr_babchuk@epam.com> <20231121221023.419901-2-volodymyr_babchuk@epam.com> <878r6p1jp2.fsf@epam.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xoeWM6RJaxUfxqijXzdk" 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+90b6cdb086a81a73aad6+7395+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 --=-xoeWM6RJaxUfxqijXzdk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-11-22 at 22:56 +0000, Volodymyr Babchuk wrote: >=20 >=20 > Paul Durrant writes: >=20 > > On 21/11/2023 22:10, Volodymyr Babchuk wrote: > > > From: David Woodhouse > > > This allows a XenDevice implementation to know whether it was > > > created > > > by QEMU, or merely discovered in XenStore after the toolstack created > > > it. This will allow us to create frontend/backend nodes only when we > > > should, rather than unconditionally attempting to overwrite them from > > > a driver domain which doesn't have privileges to do so. > > > As an added benefit, it also means we no longer have to call the > > > xen_backend_set_device() function from the device models immediately > > > after calling qdev_realize_and_unref(). Even though we could make > > > the argument that it's safe to do so, and the pointer to the unreffed > > > device *will* actually still be valid, it still made my skin itch to > > > look at it. > > > Signed-off-by: David Woodhouse > > > --- > > > =C2=A0 hw/block/xen-block.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 | 3 +-- > > > =C2=A0 hw/char/xen_console.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 | 2 +- > > > =C2=A0 hw/net/xen_nic.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 | 2 +- > > > =C2=A0 hw/xen/xen-bus.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 | 4 ++++ > > > =C2=A0 include/hw/xen/xen-backend.h | 2 -- > > > =C2=A0 include/hw/xen/xen-bus.h=C2=A0=C2=A0=C2=A0=C2=A0 | 2 ++ > > > =C2=A0 6 files changed, 9 insertions(+), 6 deletions(-) > > >=20 > >=20 > > Actually, I think you should probably update > > xen_backend_try_device_destroy() in this patch too. It currently uses > > xen_backend_list_find() to check whether the specified XenDevice has > > an associated XenBackendInstance. >=20 > Sure. Looks like it is the only user of xen_backend_list_find(), so we > can get rid of it as well. >=20 > I'll drop your R-b tag, because of those additional changes in the new > version. I think it's fine to keep. He told me to do it :) --=-xoeWM6RJaxUfxqijXzdk 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 ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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