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 4DF69C46467 for ; Mon, 16 Jan 2023 11:28:37 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHNf0-0005pC-W4; Mon, 16 Jan 2023 06:28:19 -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 1pHNev-0005jr-Nl for qemu-devel@nongnu.org; Mon, 16 Jan 2023 06:28:16 -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 1pHNes-0008Jt-QR for qemu-devel@nongnu.org; Mon, 16 Jan 2023 06:28:13 -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=FBeIC8yjcgO+j/EmLrO6Zt0wiHrl4n4YaLRJD4buJxI=; b=YQ45TuP8OKzSQQa65+FiTf4i4D c8xFSK8unnFem/JOmGTtyHKae3MzoRRRLI7iwLeKmpgMVL2z6foJ/g0mYFTKf4CTgaJbofIGlQSin LERslFyNhzTYtn/7bBH5A9DR1ZJsQsmJmw0sD7ZUJHKLT+4QGWRf/TRMUnSuDyAO3BptAz5udbEsU uVzSjozFTSSuviYTOMpuUbuDgDHxW9wkUq7yovKP0XFsuOqDHHoq1/+VU75y1yFkSMEBR9qigSO7Z +4tvG9nJWI51wIPw7ytPhTeNaBkIu0Sb+S8zjjRWWVBFDbRglObjaw2B3PeWT9F8I+OW1tdfjCdoh UXLoWvOA==; 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 1pHNet-008gWp-0Q; Mon, 16 Jan 2023 11:28:11 +0000 Message-ID: <8b7f9f0017c40b3dd4caf3a8474b20d0184f15d4.camel@infradead.org> Subject: Re: [RFC PATCH 4/5] hw/xen: [FIXME] Avoid deadlock in xen_evtchn_set_gsi() From: David Woodhouse To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , 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" , arcel Apfelbaum Date: Mon, 16 Jan 2023 11:27:56 +0000 In-Reply-To: <20230114003909.284331-5-dwmw2@infradead.org> References: <20230114003909.284331-1-dwmw2@infradead.org> <20230114003909.284331-5-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-n+Y8dzalDuCGLlkRABQ9" 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+fb0b8ce1ba8490165fd5+7085+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 --=-n+Y8dzalDuCGLlkRABQ9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable FWIW, with this support in QEMU I've just found and fixed two guest kernel regressions in MSI-X handling under Xen. And having done that, I can get back to frowning at the locking on the qemu side... On Sat, 2023-01-14 at 00:39 +0000, David Woodhouse wrote: > From: David Woodhouse >=20 > Signed-off-by: David Woodhouse > --- > =C2=A0hw/i386/kvm/xen_evtchn.c | 8 ++++++++ > =C2=A01 file changed, 8 insertions(+) >=20 > diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c > index 18c88229ab..c4103ee98b 100644 > --- a/hw/i386/kvm/xen_evtchn.c > +++ b/hw/i386/kvm/xen_evtchn.c > @@ -1436,6 +1436,14 @@ bool xen_evtchn_set_gsi(int gsi, int level) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return false; > =C2=A0=C2=A0=C2=A0=C2=A0 } > =C2=A0 > +=C2=A0=C2=A0=C2=A0 /* > +=C2=A0=C2=A0=C2=A0=C2=A0 * XXX: We access this without locking. Because = we'd deadlock > +=C2=A0=C2=A0=C2=A0=C2=A0 * if it was the callback_gsi. Do something clev= erer. > +=C2=A0=C2=A0=C2=A0=C2=A0 */ > +=C2=A0=C2=A0=C2=A0 if (gsi && gsi =3D=3D s->callback_gsi) { > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return false; > +=C2=A0=C2=A0=C2=A0 } > + > =C2=A0=C2=A0=C2=A0=C2=A0 QEMU_LOCK_GUARD(&s->port_lock); > =C2=A0 > =C2=A0=C2=A0=C2=A0=C2=A0 pirq =3D s->gsi_pirq[gsi]; I tried adding a QemuRecMutex just around s->callback_gsi which kind of works, but then I realised that I'm not supposed to be calling qemu_set_irq() without holding the BQL, am I? The code which does so (in xen_evtchn_set_callback_level()) sometimes gets triggered from a vCPU making a hypercall (which doesn't hold the BQL), and sometimes from a PV backend (which *will* hold the BQL). In fact the latter is much more common in the case where GSI delivery is needed. Because it's called from the PV backends, I don't think I can avoid the rule that the BQL is taken first, and the evtchn port_lock taken inside it. So I must never block on the BQL from the hypercall code paths. I think that means I should refactor xen_evtchn_set_callback_level() to: =E2=80=A2 Take an argument telling it whether it is running from a contex= t=C2=A0 with the BQL already held. =E2=80=A2 Do a *trylock* on the BQL if isn't already held. =E2=80=A2 If the trylock fails, invoke itself from a BH on the main I/O thread. 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