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 1B711C4332F for ; Sun, 12 Nov 2023 21:13:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r2Hla-0002jh-G3; Sun, 12 Nov 2023 16:13:14 -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 1r2HlW-0002jY-Fd for qemu-devel@nongnu.org; Sun, 12 Nov 2023 16:13:10 -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 1r2HlS-0003Et-Nx for qemu-devel@nongnu.org; Sun, 12 Nov 2023 16:13:10 -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=STqeqpWljpxVtuL1THyGccEbEnekx31vNcW7Ydm1isI=; b=JXxv7zAP5QgHl0srlfzgD6S1V3 X7Lt5I+DImgAoVXI36nH44hvl5okffkn3ylgHEhwIAfC7Gi9HgyLcOn63ixc3cE7B6TFp/+e3UtV3 cBF6j5wp65IxlAmOadJQgkRZyfXgjrysYWBX8agNhXaYLGgPVKCzOammtNKT8JX0VNzmqdnoTW6ft iVM/h+E+hR+WDtJBWw+SU6Bn3yIfcOfik8Aj5f2VwahS4vaYDUr1akUJfZhnTVFfDa45YmFeR9YrW 912LMjfds3CYQUDO+WajrgzX8Sdzb4SnMz1pL7en19ge7e7hqpqqrJXg+cjt12lBDz9gDeO+xq9w0 3D+BgxJA==; Received: from [52.94.133.131] (helo=edge-m2-r2-104.e-sfo20.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r2HlA-00AFhu-OU; Sun, 12 Nov 2023 21:12:50 +0000 Message-ID: <851f9138ccc9c4a9ec1c8f7f6c2cc57c652f2b96.camel@infradead.org> Subject: Re: [PATCH v1 4/7] xen_pvdev: Do not assume Dom0 when creating a directrory From: David Woodhouse To: Volodymyr Babchuk , "qemu-devel@nongnu.org" Cc: Oleksandr Tyshchenko , Stefano Stabellini , Anthony Perard , Paul Durrant , "open list:X86 Xen CPUs" Date: Sun, 12 Nov 2023 16:12:47 -0500 In-Reply-To: <20231110204207.2927514-5-volodymyr_babchuk@epam.com> References: <20231110204207.2927514-1-volodymyr_babchuk@epam.com> <20231110204207.2927514-5-volodymyr_babchuk@epam.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ukdGofoPqj5JFdtwTsSS" 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+7bd337da54ad26cefb50+7385+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 --=-ukdGofoPqj5JFdtwTsSS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-11-10 at 20:42 +0000, Volodymyr Babchuk wrote: > From: Oleksandr Tyshchenko >=20 > Instead of forcing the owner to domid 0, use XS_PRESERVE_OWNER to save > the previous owner of the directory. >=20 You're missing the words "... if it already exists" from that sentence. If the directory *didn't* already exist, it gets created with dom0 as the owner still, right? Assuming XenStore allows QEMU to do that. Strictly, the node gets created (if permitted) and *then* xs_set_permissions() attempts to set dom0 as the owner (if permitted). > Note that for other than Dom0 domain (non toolstack domain) the > "driver_domain" property should be set in domain config file for the > toolstack to create required directories in advance. >=20 > Signed-off-by: Oleksandr Tyshchenko > Signed-off-by: Volodymyr Babchuk > --- > =C2=A0hw/xen/xen_pvdev.c | 3 ++- > =C2=A01 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/hw/xen/xen_pvdev.c b/hw/xen/xen_pvdev.c > index c5ad71e8dc..42bdd4f6c8 100644 > --- a/hw/xen/xen_pvdev.c > +++ b/hw/xen/xen_pvdev.c > @@ -60,7 +60,8 @@ void xen_config_cleanup(void) > =C2=A0 > =C2=A0int xenstore_mkdir(char *path, int p) > =C2=A0{ > -=C2=A0=C2=A0=C2=A0 if (!qemu_xen_xs_create(xenstore, 0, 0, xen_domid, p,= path)) { > +=C2=A0=C2=A0=C2=A0 if (!qemu_xen_xs_create(xenstore, 0, XS_PRESERVE_OWNE= R, > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 xen_domid, p, path)) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xen_pv_printf(NULL, 0, "= xs_mkdir %s: failed\n", path); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -1; > =C2=A0=C2=A0=C2=A0=C2=A0 } Why bother with xenstore_mkdir()? AFAICT it's *only* used from the legacy XenLegacyDevice stuff, and can't we just finish the job of moving from that to the XenDevice model? I've done console and net recently; want to keep going? And even then... the xenstore_mkdir() function is called twice from xen_config_dev_dirs() in hw/xen/xen_devconfig.c to create the frontend and backend directories =E2=80=94 which is what the rest of your patch seri= es is trying to eliminate because a driver domain doesn't have permissions to do that anyway. It's also called from xen_be_register() in hw/xen/xen_devconfig.c to create device-model/${GUEST_DOMID}/backends/${DEVICE_TYPE} (using a relative path, so in the driver domain's XenStore). That one presumably *won't* exist already, and so XS_PRESERVE_OWNER won't even have any effect? What practical difference does this even make? 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