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 7CE8EC00A8F for ; Tue, 24 Oct 2023 18:39:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvMIT-00074U-D8; Tue, 24 Oct 2023 14:38:33 -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 1qvMIN-00073s-A0; Tue, 24 Oct 2023 14:38:27 -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 1qvMIK-0002qB-Uf; Tue, 24 Oct 2023 14:38:27 -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=159/mVIxyn39tdvjHsk97+GJhmdO7Y1c2g4WzI3Uvpc=; b=PH8UWNjAyVWaHxLUWGeO8zqKR4 BHiZgT3FfRJQHMXUo5bUCxGQfX8+8gfyVlS34/vFsr/GbETc+cRNl8JdHZ02LTmx4oH28PIohdN83 uR9QqoLkJcm/+pARjSngVy3Z+aMQwoje9LyCho1n8/F6oeWpcI/ALXH51RTW7IFlR8rPjwlyaXgAk d11z+x9/aWjH1yTsMoEpnZ80BgTqFKMOTztaCx8jl88zWqiuTUSKm1WQjPQu5rC6QSLidAu/cM595 mzKyoSrK/ZOR3kX+2RxhPmHl8M32zG4rPsxoxrgTEhJJjzRKCnn1CWSOKeTIkWA8GIK4ng8Da2+BV YAV4o8jw==; 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 1qvMID-0044Tg-4l; Tue, 24 Oct 2023 18:38:17 +0000 Message-ID: Subject: Re: [PATCH v2 16/24] hw/xen: handle soft reset for primary console 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 , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Jason Wang , Marcelo Tosatti , Cleber Rosa , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Wainer dos Santos Moschetta , Beraldo Leal , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Date: Tue, 24 Oct 2023 19:38:16 +0100 In-Reply-To: References: <20231019154020.99080-1-dwmw2@infradead.org> <20231019154020.99080-17-dwmw2@infradead.org> <8ba01df3-6189-4e1e-a70f-37a2d4dd21ed@xen.org> <3124d1d6e9af139a3c7b6dbe2b73a82914d3f559.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ATrVxf7+7Q+BNbNlR5fs" 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 --=-ATrVxf7+7Q+BNbNlR5fs Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 17:22 +0100, Paul Durrant wrote: > On 24/10/2023 16:48, David Woodhouse wrote: > > On Tue, 2023-10-24 at 16:44 +0100, Paul Durrant wrote: > > > On 19/10/2023 16:40, David Woodhouse wrote: > > > > From: David Woodhouse > > > >=20 > > > > On soft reset, the prinary console event channel needs to be reboun= d to > > > > the backend port (in the xen-console driver). We could put that int= o the > > > > xen-console driver itself, but it's slightly less ugly to keep it w= ithin > > > > the KVM/Xen code, by stashing the backend port# on event channel re= set > > > > and then rebinding in the primary console reset when it has to recr= eate > > > > the guest port anyway. > > >=20 > > > Does Xen re-bind the primary console on EVTCHNOP_reset? That's news t= o > > > me. I go check. > >=20 > > I spent an unhapp hour trying to work out how Xen actually does any of > > this :) > >=20 > > In the short term I'm more interested in having soft reset work, than > > an explicit EVTCHNOP_reset. And I can't work out *how*, but we do seem > > to have console again after a kexec in real Xen. >=20 > *Soft* reset may do it, but not the EVTCHNOP_reset hypercall itself,=20 > because there's a bunch of impenetrable toolstack magic involved the=20 > former. Perhaps you could just push the re-bind code up a layer into > kvm_xen_soft_reset(). Actually, all we're doing here is *storing* the be_port so that the *console* reset code can later connect to it. So the actual reconnect=20 is already called separately from a layer up in kvm_xen_soft_reset(). If the guest just calls EVTCHNOP_reset then it'll just get the event channels reset and the console *won't* reconnect. Actually.. if the guest just calls EVTCHNOP_reset I think they'll just hit the assert(qemu_mutex_iothread_locked()) at line 1109. We need a =20 QEMU_IOTHREAD_LOCK_GUARD() in the penultimate line of xen_evtchn_reset_op(). 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