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 F0A02EB64D9 for ; Tue, 4 Jul 2023 17:29:33 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qGjpZ-0003ZP-3E; Tue, 04 Jul 2023 13:28:49 -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 1qGjpW-0003Sw-C6 for qemu-devel@nongnu.org; Tue, 04 Jul 2023 13:28:46 -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 1qGjpT-0005FI-3q for qemu-devel@nongnu.org; Tue, 04 Jul 2023 13:28:45 -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=sgOtH+/YeJcmEyF3EeLLhp8teRgeyr++kODkNRphnRk=; b=WGm7jJbPP1OfxBNi5/hWLzsS1x 15Zgp9vqZpxvv6Any64hxBo8o5LZSCmr3oWsgznmEOxz3a3ztERveYVwd2IwZYiBHGkDhii8BEpSR zCqxsLSdfH4rqzvI0fFnru2Mu9vp5H1tc9KT+YDxjFWRTjMOMPiKidBVvsjFN2SDlA2PGyAxtHq7C oVaLIFGYXibpLO/RBy+a4QR6ifhGn8h4H9EXNSUQUezOt4WKRZmVBi1j1zKs6lK8zZpmPR+yMyUlP QySx90yKHZXiPZmhaDjrUM59XlCYg/j6IF9B427DWk4QJW6JJc+qMhPqjyZBlNTAeWInzKp+kGjGi d38WyA9Q==; Received: from [2001:8b0:10b:5:36c:5942:7c03:2db0] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qGjpM-009Kx1-Us; Tue, 04 Jul 2023 17:28:37 +0000 Message-ID: Subject: Re: [PULL 57/62] hw/xen: Support MSI mapping to PIRQ From: David Woodhouse To: Peter Maydell Cc: "pbonzini@redhat.com" , "qemu-devel@nongnu.org" , "paul@xen.org" Date: Tue, 04 Jul 2023 18:28:36 +0100 In-Reply-To: References: <20230302123029.153265-1-pbonzini@redhat.com> <20230302123029.153265-58-pbonzini@redhat.com> <4a447dc0967186cb92605eb54209636e9eace8f0.camel@amazon.co.uk> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-zDkGK+i0aWWHkose/WrD" 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+cf2aa98949e522d56bcb+7254+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 --=-zDkGK+i0aWWHkose/WrD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-06-23 at 14:27 +0100, Peter Maydell wrote: > On Thu, 6 Apr 2023 at 17:25, Woodhouse, David wrote: > >=20 > > On Thu, 2023-04-06 at 16:48 +0100, Peter Maydell wrote: > > > On Thu, 2 Mar 2023 at 12:37, Paolo Bonzini wrot= e: > > > >=20 > > > > From: David Woodhouse > > > >=20 > > > > The way that Xen handles MSI PIRQs is kind of awful. > > >=20 > > > > Now that this is working we can finally enable XENFEAT_hvm_pirqs an= d > > > > let the guest use it all. > > > >=20 > > >=20 > > > Hi; Coverity points out a logic error in this code (CID 1507603): > > >=20 > > > > @@ -1638,6 +1877,7 @@ int xen_physdev_unmap_pirq(struct physdev_unm= ap_pirq *unmap) > > > >=20 > > > > =C2=A0=C2=A0=C2=A0=C2=A0 /* We can only unmap GSI PIRQs */ > > > > =C2=A0=C2=A0=C2=A0=C2=A0 if (gsi < 0) { > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 qemu_mutex_unlock(&s->p= ort_lock); > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -EINVAL; > > > > =C2=A0=C2=A0=C2=A0=C2=A0 } > > >=20 > > > One of the things xen_physdev_unmap_pirq() does early is return > > > if gsi is a negative value... > > >=20 > > > > @@ -1646,6 +1886,12 @@ int xen_physdev_unmap_pirq(struct physdev_un= map_pirq *unmap) > > > > =C2=A0=C2=A0=C2=A0=C2=A0 pirq_inuse_word(s, pirq) &=3D ~pirq_inuse_= bit(pirq); > > > >=20 > > > > =C2=A0=C2=A0=C2=A0=C2=A0 trace_kvm_xen_unmap_pirq(pirq, gsi); > > > > +=C2=A0=C2=A0=C2=A0 qemu_mutex_unlock(&s->port_lock); > > > > + > > > > +=C2=A0=C2=A0=C2=A0 if (gsi =3D=3D IRQ_MSI_EMU) { > > >=20 > > > ...but then later we try to test to see if it is IRQ_MSI_EMU. > > > IRQ_MSI_EMU is -3, so this condition can never be true. > > >=20 > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kvm_update_msi_routes_a= ll(NULL, true, 0, 0); > > > > +=C2=A0=C2=A0=C2=A0 } > > >=20 > > > What was the intention here ? > >=20 > >=20 > > Hrm.... the way that Xen automatically maps the MSI to a PIRQ by > > snooping on the (masked) writes to the MSI target is awful, as noted. > >=20 > > I don't think Linux guests ever do unmap the MSI PIRQ but it might be > > possible; I'll have to do some experiments in Xen to see what happens. >=20 > Did you ever figure out what the right thing here was ? Yeah, I do I think that Xen will actually allow the guest to unmap the IRQ_MSI_EMU pirq, and it will mask the underlying MSI when it does so, just as it *unmasks* the MSI when the guest binds the irq. But that's partly because Xen handles the awfulness with snooping on the MSI table writes differently. The PIRQ isn't automatically marked as IRQ_MSI_EMU when the MSI message is written; there's a different structure which handles that. And the PIRQ is only set to IRQ_MSI_EMU when it's actually *delivered*, AFAICT. Emulating that more faithfully might actually simplify the locking in qemu, which is fairly complex around the MSI=E2=86=92PIRQ=E2=86=92MSI call = paths which need care to avoid deadlock. I'll see if I can make it simpler. In the short term though, I think it's harmless that we don't support unmapping IRQ_MSI_EMU because AFAICT nobody actually *does* it. 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