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 56143C4167B for ; Tue, 28 Nov 2023 14:11:49 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r7yoV-0005UU-1y; Tue, 28 Nov 2023 09:11:47 -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 1r7yoJ-0005Rc-5T; Tue, 28 Nov 2023 09:11:36 -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 1r7yoA-0007Dv-4Y; Tue, 28 Nov 2023 09:11:29 -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=A8H4YFefXZoEJ7R00UxgIz/kgIL4v0DxDKH+UFE+enE=; b=WPCqOskbw3mxvg7bShMbpxiFlS rub9WdrOXDfOavdk3YF6oDmsu8Ds8anbxe8OkFSjSLkd6LKG23ieo7c7gWJlh2zDWsjGO37E+wjnI 5dZH0N2NphHJ5RrLX/b2/m3LiXvjna66fsLxmSTQSKKBX8cGOCHZx7LKAl62KHnPrDHF1Ut6uqLQS qfKycws9xDnfvOPOVyXTO9jFwtfkeRpeZ6mRrTWQxGZaODouYMo/oYL1GmWIrGuAzOA1IMq9s5T04 HPuIN/ulXst61x8Eq7tJ1OWt5jY3/EH9El7jhnPxTbGZjqR0aXb6FpXWJy1SnETFaUzMdRA4P/5dV 1ayNCMaA==; Received: from [2001:8b0:10b:5:f9ea:a921:5c3e:db1d] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r7yo3-00CQQo-Hh; Tue, 28 Nov 2023 14:11:19 +0000 Message-ID: <685c9b037b66dd250565f3022d53297c02a3cccd.camel@infradead.org> Subject: Re: [EXTERNAL] [PATCH v3 2/5] xen: backends: don't overwrite XenStore nodes created by toolstack From: David Woodhouse To: Volodymyr Babchuk Cc: "qemu-devel@nongnu.org" , Stefano Stabellini , Julien Grall , Paul Durrant , Oleksandr Tyshchenko , Anthony Perard , Paul Durrant , Kevin Wolf , Hanna Reitz , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , Jason Wang , "open list:X86 Xen CPUs" , "open list:Block layer core" Date: Tue, 28 Nov 2023 14:11:18 +0000 In-Reply-To: <87il5mvfkt.fsf@epam.com> References: <20231124232400.943580-1-volodymyr_babchuk@epam.com> <20231124232400.943580-3-volodymyr_babchuk@epam.com> <51fd9b1f4407b92352c109cbef5acf16c91351d4.camel@infradead.org> <87il5mvfkt.fsf@epam.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Vf+wu7c63S3rqDwH86wx" 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+1109833b3cfcadd2158c+7401+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 --=-Vf+wu7c63S3rqDwH86wx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-11-28 at 01:20 +0000, Volodymyr Babchuk wrote: > Hi David, >=20 > Thank you for the review >=20 > David Woodhouse writes: >=20 > > [[S/MIME Signed Part:Undecided]] > > On Fri, 2023-11-24 at 23:24 +0000, Volodymyr Babchuk wrote: > > > Xen PV devices in QEMU can be created in two ways: either by QEMU > > > itself, if they were passed via command line, or by Xen toolstack. In > > > the latter case, QEMU scans XenStore entries and configures devices > > > accordingly. > > >=20 > > > In the second case we don't want QEMU to write/delete front-end > > > entries for two reasons: it might have no access to those entries if > > > it is running in un-privileged domain and it is just incorrect to > > > overwrite entries already provided by Xen toolstack, because > > > toolstack > > > manages those nodes. For example, it might read backend- or frontend- > > > state to be sure that they are both disconnected and it is safe to > > > destroy a domain. > > >=20 > > > This patch checks presence of xendev->backend to check if Xen PV > > > device was configured by Xen toolstack to decide if it should touch > > > frontend entries in XenStore. Also, when we need to remove XenStore > > > entries during device teardown only if they weren't created by Xen > > > toolstack. If they were created by toolstack, then it is toolstack's > > > job to do proper clean-up. > > >=20 > > > Suggested-by: Paul Durrant > > > Suggested-by: David Woodhouse > > > Co-Authored-by: Oleksandr Tyshchenko > > > Signed-off-by: Volodymyr Babchuk > >=20 > > Reviewed-by: David Woodhouse > >=20 > > ... albeit with a couple of suggestions...=20 > >=20 > > > diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c > > > index bef8a3a621..b52ddddabf 100644 > > > --- a/hw/char/xen_console.c > > > +++ b/hw/char/xen_console.c > > > @@ -450,7 +450,7 @@ static void xen_console_realize(XenDevice *xendev= , Error **errp) > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0 trace_xen_console_realize(con->dev, object_g= et_typename(OBJECT(cs))); > > >=20 > > > -=C2=A0=C2=A0=C2=A0 if (CHARDEV_IS_PTY(cs)) { > > > +=C2=A0=C2=A0=C2=A0 if (CHARDEV_IS_PTY(cs) && !xendev->backend) { > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Strip the leading= 'pty:' */ > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xen_device_frontend_= printf(xendev, "tty", "%s", cs->filename + 4); > > > =C2=A0=C2=A0=C2=A0=C2=A0 } > >=20 > >=20 > > It's kind of weird that that one is a frontend node at all; surely it > > should have been a backend node? >=20 > Yeah, AFAIK, console was the first PV driver, so it is a bit strange. > As I see, this frontend entry is used by "xl console" tool to find PTY > device to attach to. So yes, it should be in backend part of the > xenstore. But I don't believe we can fix this right now. Agreed. > > But it is known only to QEMU once it > > actually opens /dev/ptmx and creates a new pty. It can't be populated > > by the toolstack in advance. > >=20 > > So shouldn't the toolstack have made it writable by the driver domain? >=20 > Maybe it can lead to a weird situation when user in Dom-0 tries to use > "xl console" command to attach to a console that is absent in Dom-0, > because "tty" entry points to PTY in the driver domain. True, but that possibility exists the moment you have console provided in a driver domain. ... > > Perhaps here you should create the "mac" node if it doesn't exist (or > > is that "if it doesn't match netdev->conf.macaddr"?) and just > > gracefully accept failure too? > >=20 >=20 > I am not sure that I got this right. conf.maccadr can be sent in two > ways: via xen_net_device_create(), which will fail if toolstack didn't > provided a MAC address, or via qemu_macaddr_default_if_unset(), which is > the case for Xen emulation. The latter happens with hotplug under Xen too, not just Xen emulation. But the key point you make is that xen_net_device_create() will refuse to drive a device which the toolstack created, if the "mac" node isn't present. So creating it for ourselves based on 'if (!xendev->backend)' as you did in your patch is reasonable enough. 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