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 848A1C3DA78 for ; Sun, 15 Jan 2023 14:13:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230456AbjAOOND (ORCPT ); Sun, 15 Jan 2023 09:13:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230307AbjAOONB (ORCPT ); Sun, 15 Jan 2023 09:13:01 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08EFBF768; Sun, 15 Jan 2023 06:13:00 -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=OOTmTEZ5tSYiLE0Aufj+nlndsvBbI3BEiPky8VVv93w=; b=KwUOt/Nw5GaPANM4wZ26yailqU 2IrfIAai3ZAYJBbtzFDTwfW6uMtL+7SJRiVSfYRNVXhyBYD9bgE58ZgrMMXKIyrR1pIAvQ4U2irfg ZnRaY1LJfeyTNtqBdr4IYkbgAyMEh1cTRwl9yr/GbPwTiLeucfOboLMJar99XxmqNVYE+zgDTWPt4 JwFk8ZzbJGj35RUjyWkeReh0Soo6DSzsPJEWNyggCoHKdOSm4/CIm4+PlVqkICTGb6AcunGoG15fr OTejiZc++bXwB2vmAiO21saI28Eb/veLOiSLjRTqlpnGdXYKkXaeUumREQmjilHWm96BikBCcJXPM HFG87D4Q==; 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 1pH3ks-007tbH-UF; Sun, 15 Jan 2023 14:13:03 +0000 Message-ID: <55f581345df465a73d6469f44d3512d9ccac7ffc.camel@infradead.org> 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 14:12:48 +0000 In-Reply-To: <20200826112333.622352798@linutronix.de> References: <20200826111628.794979401@linutronix.de> <20200826112333.622352798@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-DTVWzgYGVALze2v8okE9" 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-pci@vger.kernel.org --=-DTVWzgYGVALze2v8okE9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 necessar= y > to make XEN/MSI irq domain compatible. >=20 > While the right solution would be to truly convert XEN to irq domains, th= is > is an exercise which is not possible for mere mortals with limited XENolo= gy. >=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 igora= nt > person to make progress on the issue which triggered this change. >=20 > Signed-off-by: Thomas Gleixner > Acked-by: Juergen Gross I think it broke MSI-X support, because xen_pci_msi_domain_info is lacking a .flags =3D MSI_FLAGS_PCI_MSIX? > --- > Note: This is completely untested, but it compiles so it must be perfect. 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 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 way lies madness. 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 ad= d the missing MSI_FLAGS_PCI_MSIX flag then under my qemu I get: 38: 3180 0 xen-pirq -msi-x ens4-rx-0 39: 0 3610 xen-pirq -msi-x ens4-tx-0 40: 1 0 xen-pirq -msi-x ens4 But without the flags I get: [ 8.464212] e1000e 0000:00:04.0 ens4: Failed to initialize MSI interrupt= s. Falling back to legacy interrupts. =C2=B9 https://lore.kernel.org/qemu-devel/20230110122042.1562155-1-dwmw2@in= fradead.org/ --=-DTVWzgYGVALze2v8okE9 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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