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 63BFCC07545 for ; Tue, 24 Oct 2023 16:35:55 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvKNL-00022t-9r; Tue, 24 Oct 2023 12:35:27 -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 1qvKNC-0001xY-4W; Tue, 24 Oct 2023 12:35:22 -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 1qvKN6-0004EO-Jx; Tue, 24 Oct 2023 12:35:16 -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=a60RMTnb4djx5eflnMuycThd8FavegnLDZss3+MFUJc=; b=i6MjXydazWpkGTJffIYffzbLWv qcEv09Lqge6693zPyF/jTxoSRINN5FFNhC7ANynKPza358yYf8wClj2yqeL6tklJrf6grke5LZYmz mtnSz8B/wT4r5VLsgVFR6O1WK4N12txBBEwr7XSwF+EFAc6BDMoSoz0KZ/m5hH3HkBeio5TBAw7X4 2wS9Pm/TR+j9o0a4WoeNEI3S2mdV3EV1ktsqXY4ZraZi/UJdi7KyJL499HWiIWJn86VUvWcQDIxIX mYCFMqyTJDMX7UDn3fsY6yORl6I/Nkk/Wtt7+88mVsKEPw2uYzJ3x65SMsEGIDN7HK8s3yovQmXg/ f/Ss9BHQ==; Received: from [2001:8b0:10b:5:758e:a1c4:bc7:e7a7] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvKMu-003Xj7-1T; Tue, 24 Oct 2023 16:35:00 +0000 Message-ID: Subject: Re: [PATCH 12/12] hw/xen: add support for Xen primary console in emulated mode From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?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: Tue, 24 Oct 2023 17:34:59 +0100 In-Reply-To: <19fc2701-4cd8-4a14-9d45-bfaea37ed2d6@xen.org> References: <20231016151909.22133-1-dwmw2@infradead.org> <20231016151909.22133-13-dwmw2@infradead.org> <3acd078bba2d824f836b20a270c780dc2d031c43.camel@infradead.org> <3f22903b-30f0-40f2-8624-b681d9c7e05d@xen.org> <42b005d7c03d5b0d47a16c4e025d8c3ec7289e0f.camel@infradead.org> <19fc2701-4cd8-4a14-9d45-bfaea37ed2d6@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-0bFV5S8jH3FK9aht74Ff" 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+e2898748ca55db067849+7366+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 --=-0bFV5S8jH3FK9aht74Ff Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 17:25 +0100, Paul Durrant wrote: > On 24/10/2023 16:49, David Woodhouse wrote: > > On Tue, 2023-10-24 at 16:39 +0100, Paul Durrant wrote: > > > On 24/10/2023 16:37, David Woodhouse wrote: > > > > On Tue, 2023-10-24 at 15:20 +0100, Paul Durrant wrote: > > > > > On 16/10/2023 16:19, David Woodhouse wrote: > > > > > > From: David Woodhouse > > > > > >=20 > > > > > > The primary console is special because the toolstack maps a pag= e at a > > > > > > fixed GFN and also allocates the guest-side event channel. Add = support > > > > > > for that in emulated mode, so that we can have a primary consol= e. > > > > > >=20 > > > > > > Add a *very* rudimentary stub of foriegnmem ops for emulated mo= de, which > > > > > > supports literally nothing except a single-page mapping of the = console > > > > > > page. This might as well have been a hack in the xen_console dr= iver, but > > > > > > this way at least the special-casing is kept within the Xen emu= lation > > > > > > code, and it gives us a hook for a more complete implementation= if/when > > > > > > we ever do need one. > > > > > >=20 > > > > > Why can't you map the console page via the grant table like the x= enstore > > > > > page? > > > >=20 > > > > I suppose we could, but I didn't really want the generic xen-consol= e > > > > device code having any more of a special case for 'Xen emulation' t= han > > > > it does already by having to call xen_primary_console_create(). > > > >=20 > > >=20 > > > But doesn't is save you the whole foreignmem thing? You can use the > > > grant table for primary and secondary consoles. > >=20 > > Yes. And I could leave the existing foreignmem thing just for the case > > of primary console under true Xen. It's probably not that awful a > > special case, in the end. > >=20 > > Then again, I was surprised I didn't *already* have a foreignmem ops > > for the emulated case, and we're probably going to want to continue > > fleshing it out later, so I don't really mind adding it. > >=20 >=20 > True. We'll need it for some of the other more fun protocols like vkbd= =20 > or fb. Still, I think it'd be nicer to align the xenstore and primary > console code to look similar and punt the work until then :-) I don't think it ends up looking like xenstore either way, does it? Xenstore is special because it gets to use the original pointer to its own page. I don't think I want to hack the xen_console code to explicitly call a xen_console_give_me_your_page() function. If not foreignmem, I think you were suggesting that we actually call the grant mapping code to get a pointer to the underlying page, right?=20 I could kind of live with that... except that Xen has this ugly convention that the "ring-ref" frontend node for the primary console actually has the *MFN* not a grant ref. Which I don't understand since the toolstack *does* populate the grant table for it (just as it does for the xenstore page).=C2=A0But we'd have to add a special case exception to that special case, so that in the emu case it's an actual grant ref again. I think I prefer just having a stub of foreignmem, TBH. 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