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 2F742C3DA78 for ; Tue, 17 Jan 2023 12:12:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHkpL-00019m-Le; Tue, 17 Jan 2023 07:12:32 -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 1pHkpC-00018z-I5 for qemu-devel@nongnu.org; Tue, 17 Jan 2023 07:12:23 -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 1pHkpA-0004Y1-6z for qemu-devel@nongnu.org; Tue, 17 Jan 2023 07:12:22 -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=D3opD4PILj4qUF7gsdkriVBKRiKKLm5w6EILY0eZfDI=; b=okpAAhNg/F5HeCNlMT9ziIMjoZ 5fcmBXBMrLzxBH5JXoWViWmZgXUQJRNzkfIToN2rt4BYXX3F5vuU8vsSZtBWarrSXOnG/nRfCs7bY yPeUnDet1PGNgY/7ytheEcUGGx8cRfgjR9b1JHCGAmPkVusoSU5OzxG61ygPYzEB+cH8GCPon9Igm qJLVuAd6TdczXpwauRtqBzdI4f7ffaJwgw1e28iNx6whOHmqlwtfTiFKXK9TNFUjgRQuPES0xXvV1 FM+wvdu42VUpGoAy0VlT42L0kaiakMxx1Hq0VzsMHHsFaBxMetpvXLawvV7FVCHH+ivc8TJkNM1XK zG8sjqHw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pHkpF-009fCZ-EU; Tue, 17 Jan 2023 12:12:25 +0000 Message-ID: Subject: Re: [PATCH v7 26/51] hw/xen: Add xen_evtchn device for event channel emulation From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Paolo Bonzini , Joao Martins , Ankur Arora , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Thomas Huth , Alex =?ISO-8859-1?Q?Benn=E9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com Date: Tue, 17 Jan 2023 12:12:10 +0000 In-Reply-To: <59f4e3c3-0939-134b-596b-ebfc5d06a11d@xen.org> References: <20230116215805.1123514-1-dwmw2@infradead.org> <20230116215805.1123514-27-dwmw2@infradead.org> <8ab2cfafa5636d7f084e8a75d273d7bf7b6b7579.camel@infradead.org> <726f2f63-dc74-619e-4cb0-205f9a542b99@xen.org> <6234afac-b260-37ab-6f3b-17ed5e3ba6a2@xen.org> <555a94eb3b65d45bae7d2da6571d072e773c2d50.camel@infradead.org> <59f4e3c3-0939-134b-596b-ebfc5d06a11d@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-uY5Vge/UcWNMNWrtIXHI" User-Agent: Evolution 3.44.4-0ubuntu1 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+d80603fb936c028ea1fe+7086+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 --=-uY5Vge/UcWNMNWrtIXHI Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-01-17 at 11:53 +0000, Paul Durrant wrote: > On 17/01/2023 11:24, David Woodhouse wrote: > > On Tue, 2023-01-17 at 11:06 +0000, Paul Durrant wrote: > > > On 17/01/2023 11:02, David Woodhouse wrote: > > > > On Tue, 2023-01-17 at 10:56 +0000, Paul Durrant wrote: > > > > >=20 > > > > > I'm just having a hard time seeing why passing 0 to > > > > > xen_evtchn_set_callback_param() does anything useful... > > > > >=20 > > > > > +=C2=A0=C2=A0=C2=A0 switch (param >> CALLBACK_VIA_TYPE_SHIFT) { > > > > > +=C2=A0=C2=A0=C2=A0 case HVM_PARAM_CALLBACK_TYPE_VECTOR: { > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct kvm_xen_hvm_at= tr xa =3D { > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 .type =3D KVM_XEN_ATTR_TYPE_UPCALL_VECTOR, > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 .u.vector =3D (uint8_t)param, > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }; > > > > >=20 > > > > > HVM_PARAM_CALLBACK_TYPE_VECTOR is 2 AFAICT, so it won't hit that > > > > > case. > > > > > Also, you appear to be passing the unshifted param to kernel > > > > > anyway. > > > > >=20 > > > > > What is the call trying to achieve? > > > >=20 > > > > Zero is HVM_PARAM_CALLBACK_TYPE_GSI, with GSI=3D=3D0. It's basicall= y > > > > disabling event channel delivery for the new kernel. > > > >=20 > > >=20 > > > AFAICT it is doing nothing at this point. Unless I am going insane it > > > results in this codepath: > > >=20 > > > +=C2=A0=C2=A0=C2=A0 default: > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret =3D -ENOSYS; > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 break; > > > +=C2=A0=C2=A0=C2=A0 } > > > + > > > +=C2=A0=C2=A0=C2=A0 if (!ret) { > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 s->callback_param =3D par= am; > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 s->evtchn_in_kernel =3D i= n_kernel; > > > +=C2=A0=C2=A0=C2=A0 } > > >=20 > > > So it doesn't result in any cleanup. What am I missing? > >=20 > > Indeed, it doesn't result in any cleanup at *this* point in the series > > because HVM_PARAM_CALLBACK_TYPE_GSI hasn't been implemented yet; it's > > in a later patch. > >=20 > > The series is broken up into sensible individual patches for review, > > not so people can actually *run* with some partial subset of them. > >=20 >=20 > That's fine. It's just confusing for a reviewer to know whether you are= =20 > intentionally introducing code that has no effect, or whether that is a b= ug. Actually... it *is* a bug. Even when GSI support is added later, nothing ever tells the kernel to *stop* delivering via the upcall vector. I'll fix. 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