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 F275FC61D85 for ; Thu, 23 Nov 2023 10:46:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r67Dx-0007LF-9H; Thu, 23 Nov 2023 05:46:22 -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 1r67Dl-0007JL-4f for qemu-devel@nongnu.org; Thu, 23 Nov 2023 05:46:16 -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 1r67Dd-0006oq-Aj for qemu-devel@nongnu.org; Thu, 23 Nov 2023 05:46:07 -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=YgbOl5KVQSweppal67uN/c/tuov8oL3IO6B2TE/Nb2A=; b=Twtcs798PsgHz1n3KmV4Hfts1h EVrzUULWOm+8NfGN4vw8vYlm3a+6qdp2d8+rJBREp1O1fLZOnrlF8sdjd4Sss0ZETDOiUHC5Q+4HZ KLZK7q6wUaxBXtK8yDY/EW+fNPfiZMrYk5HJyTzsdjwtvO5FAlL0ogwVt1WQD2Qn1GiVw5DqpLSwF 40MLofirMifnCswsoW9WblhgD3TWSzvut3hpCJu9/Eo8Fd9/70m71N+FHPpUaFx1bT9zcX9t63SO4 tDxJ7+ikPVnfh3enozhZ976e1mXWgzgvSK0MM0k6Z+v7QPEEc9Zw4Omtc933tfZFJ9H+pUtgs5do/ J7KWX6yA==; 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 1r67DP-007ROx-VG; Thu, 23 Nov 2023 10:45:48 +0000 Message-ID: Subject: Re: [PATCH v2 4/6] xen_pvdev: Do not assume Dom0 when creating a directory From: David Woodhouse To: paul@xen.org, Volodymyr Babchuk Cc: Stefano Stabellini , "qemu-devel@nongnu.org" , Julien Grall , Oleksandr Tyshchenko , Anthony Perard , "open list:X86 Xen CPUs" Date: Thu, 23 Nov 2023 10:45:47 +0000 In-Reply-To: References: <20231121221023.419901-1-volodymyr_babchuk@epam.com> <20231121221023.419901-5-volodymyr_babchuk@epam.com> <87r0khz6zj.fsf@epam.com> <87cyw1z61i.fsf@epam.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-cdqYlfmCuXFPBfTl9hXO" 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+6463b3cc4e0ea8740225+7396+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 --=-cdqYlfmCuXFPBfTl9hXO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-11-23 at 09:28 +0000, Paul Durrant wrote: > On 23/11/2023 00:07, Volodymyr Babchuk wrote: > >=20 > > Hi, > >=20 > > Volodymyr Babchuk writes: > >=20 > > > Hi Stefano, > > >=20 > > > Stefano Stabellini writes: > > >=20 > > > > On Wed, 22 Nov 2023, David Woodhouse wrote: > > > > > On Wed, 2023-11-22 at 15:09 -0800, Stefano Stabellini wrote: > > > > > > On Wed, 22 Nov 2023, David Woodhouse wrote: > > > > > > > On Wed, 2023-11-22 at 14:29 -0800, Stefano Stabellini wrote: > > > > > > > > On Wed, 22 Nov 2023, Paul Durrant wrote: > > > > > > > > > On 21/11/2023 22:10, Volodymyr Babchuk wrote: > > > > > > > > > > From: Oleksandr Tyshchenko > > > > > > > > > >=20 > > > > > > > > > > Instead of forcing the owner to domid 0, use XS_PRESERV= E_OWNER to > > > > > > > > > > inherit the owner of the directory. > > > > > > > > >=20 > > > > > > > > > Ah... so that's why the previous patch is there. > > > > > > > > >=20 > > > > > > > > > This is not the right way to fix it. The QEMU Xen support= is *assuming* that > > > > > > > > > QEMU is either running in, or emulating, dom0. In the emu= lation case this is > > > > > > > > > probably fine, but the 'real Xen' case it should be using= the correct domid > > > > > > > > > for node creation. I guess this could either be supplied = on the command line > > > > > > > > > or discerned by reading the local domain 'domid' node. > > > > > > > >=20 > > > > > > > > yes, it should be passed as command line option to QEMU > > > > > > >=20 > > > > > > > I'm not sure I like the idea of a command line option for som= ething > > > > > > > which QEMU could discover for itself. > > > > > >=20 > > > > > > That's fine too. I meant to say "yes, as far as I know the tool= stack > > > > > > passes the domid to QEMU as a command line option today". > > > > >=20 > > > > > The -xen-domid argument on the QEMU command line today is the *gu= est* > > > > > domain ID, not the domain ID in which QEMU itself is running. > > > > >=20 > > > > > Or were you thinking of something different? > > > >=20 > > > > Ops, you are right and I understand your comment better now. The ba= ckend > > > > domid is not on the command line but it should be discoverable (on > > > > xenstore if I remember right). > > >=20 > > > Yes, it is just "~/domid". I'll add a function that reads it. > >=20 > > Just a quick question to QEMU folks: is it better to add a global > > variable where we will store own Domain ID or it will be okay to read > > domid from Xenstore every time we need it? > >=20 > > If global variable variant is better, what is proffered place to define > > this variable? system/globals.c ? > >=20 >=20 > Actually... is it possible for QEMU just to use a relative path for the= =20 > backend nodes? That way it won't need to know it's own domid, will it? That covers some of the use cases, but it may also need to know its own domid for other purposes. 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