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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B570DC3DA78 for ; Sun, 15 Jan 2023 20:28:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231444AbjAOU2C (ORCPT ); Sun, 15 Jan 2023 15:28:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231428AbjAOU2B (ORCPT ); Sun, 15 Jan 2023 15:28:01 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FF89CC3F; Sun, 15 Jan 2023 12:27:59 -0800 (PST) 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=hma09GUeOo7cUxAt1yb4jq2ttpTMOL2/HqikVNdDUyU=; b=ix779t5rx2ljo0GSoIwBMqI3Rp OWtSaolAWth33HaIaWD3AnpEL8qegqJKX0izXE4LzOvJbpL2q30iMd6YS2QAB6Ei/NelMPWV15Cka uLbXor+xf30XtMcF08VOmroAMeL4zq6BEll0+8XgCwbf7EYZdRZz1vkfUiA2gOZw3w/DNYCl8kH45 HxL4qdy7h6nim4STkmhMYD8iJWbBsfGtOkZQLGR5Z+D1aA6SbufljKwQAent9aoQUuEzJ7Ab7sdkR rCi8FW30V+GbtGMcfTbZ9woeyz+sWAqtKVde/yuzu+o0TrbThbRYuOdu5VitP3E51U5OWa27g4+zr HJaSIzWA==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pH9bj-0087DO-2j; Sun, 15 Jan 2023 20:27:59 +0000 Message-ID: Subject: Re: [patch V2 30/46] x86/xen: Wrap XEN MSI management into irqdomain From: David Woodhouse To: Thomas Gleixner , LKML , xen-devel Cc: Dimitri Sivanich , linux-hyperv@vger.kernel.org, Steve Wahl , linux-pci@vger.kernel.org, "K. Y. Srinivasan" , Dan Williams , Wei Liu , Stephen Hemminger , Baolu Lu , Marc Zyngier , x86@kernel.org, Jason Gunthorpe , Megha Dey , xen-devel@lists.xenproject.org, Kevin Tian , Konrad Rzeszutek Wilk , Haiyang Zhang , Alex Williamson , Stefano Stabellini , Bjorn Helgaas , Dave Jiang , Boris Ostrovsky , Jon Derrick , Juergen Gross , Russ Anderson , Greg Kroah-Hartman , iommu@lists.linux-foundation.org, Jacob Pan , "Rafael J. Wysocki" Date: Sun, 15 Jan 2023 20:27:44 +0000 In-Reply-To: <55f581345df465a73d6469f44d3512d9ccac7ffc.camel@infradead.org> References: <20200826111628.794979401@linutronix.de> <20200826112333.622352798@linutronix.de> <55f581345df465a73d6469f44d3512d9ccac7ffc.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-fjKh0loIuJRGzJfL12nv" 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 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org --=-fjKh0loIuJRGzJfL12nv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2023-01-15 at 14:12 +0000, David Woodhouse wrote: > On Wed, 2020-08-26 at 13:16 +0200, Thomas Gleixner wrote: > > From: Thomas Gleixner > >=20 > > To allow utilizing the irq domain pointer in struct device it is necess= ary > > to make XEN/MSI irq domain compatible. > >=20 > > While the right solution would be to truly convert XEN to irq domains, = this > > is an exercise which is not possible for mere mortals with limited XENo= logy. > >=20 > > Provide a plain irqdomain wrapper around XEN. While this is blatant > > violation of the irqdomain design, it's the only solution for a XEN igo= rant > > person to make progress on the issue which triggered this change. > >=20 > > Signed-off-by: Thomas Gleixner > > Acked-by: Juergen Gross >=20 > I think it broke MSI-X support, because xen_pci_msi_domain_info is > lacking a .flags =3D MSI_FLAGS_PCI_MSIX? Hm, I think it only actually *broke* with commit 99f3d27976 ("PCI/MSI: Reject MSI-X early") from November last year. So 6.1 was OK and we have time to fix it in 6.2. Confirmed on real Xen at least that a Fedora 37 install with a 6.0.7 kernel works fine, then on upgrading to Rawhide's 6.2-rc3 it dies with=20 [ 41.498694] ena 0000:00:03.0 (unnamed net_device) (uninitialized): Faile= d to enable MSI-X. irq_cnt -524 [ 41.498705] ena 0000:00:03.0: Can not reserve msix vectors [ 41.498712] ena 0000:00:03.0: Failed to enable and set the admin interru= pts > > --- > > Note: This is completely untested, but it compiles so it must be perfec= t. >=20 >=20 > I'm working on making it simple for you to test that, by hosting Xen > HVM guests natively in qemu (under KVM=C2=B9).=C2=A0 >=20 > But I'm absolutely not going to try hacking on both guest and host side > at the same time when I'm trying to ensure compatibility =E2=80=94 that w= ay > lies madness. >=20 > So for now I'm going to test qemu with older kernels, and maybe someone > (J=C3=BCrgen}? can test MSI-X to PIRQ support under real Xen?) FWIW if I = add > the missing MSI_FLAGS_PCI_MSIX flag then under my qemu I get: >=20 > =C2=A038:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3180=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0 xen-pirq=C2=A0=C2=A0=C2=A0 -msi-x= =C2=A0=C2=A0=C2=A0=C2=A0 ens4-rx-0 > =C2=A039:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3610=C2=A0 xen-pirq=C2=A0=C2=A0=C2=A0 -msi-x= =C2=A0=C2=A0=C2=A0=C2=A0 ens4-tx-0 > =C2=A040:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0 xen-pirq=C2=A0=C2= =A0=C2=A0 -msi-x=C2=A0=C2=A0=C2=A0=C2=A0 ens4 >=20 > But without the flags I get: >=20 > [=C2=A0=C2=A0=C2=A0 8.464212] e1000e 0000:00:04.0 ens4: Failed to initial= ize MSI interrupts.=C2=A0 Falling back to legacy interrupts. >=20 > =C2=B9 https://lore.kernel.org/qemu-devel/20230110122042.1562155-1-dwmw2@= infradead.org/ --=-fjKh0loIuJRGzJfL12nv Content-Type: application/pkcs7-signature; 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