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 X-Spam-Level: X-Spam-Status: No, score=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A361C433FE for ; Thu, 10 Dec 2020 08:24:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C10252343F for ; Thu, 10 Dec 2020 08:24:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387916AbgLJIXv (ORCPT ); Thu, 10 Dec 2020 03:23:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387534AbgLJIXp (ORCPT ); Thu, 10 Dec 2020 03:23:45 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F38E4C0613D6; Thu, 10 Dec 2020 00:23:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=/Rd4xmmEG8hh99LsiyyS9pVm/y227mmanNuCMG2FHXA=; b=HSyiQtnlMKunFvgxfuVdVrdziu FOa8/C0KIAWzkRuBuACNFiqNiiPOAwpO4bRdwQFN9jHM922d485rvTSKnXgfaeeI6pG/4XFBSQTib bGRwQFxN1uU5NvOE40plvKhrsoH8FpAwl7WYbyDmPe6RXnkRj1Ha9/vNBXbvwhsDYIXV98cCRr8OF IH+nV7djJpB5CF3RP6+abko4cWhf9VKnGB24rJyDOfXTFASM4Pv1edGx41XPhhzbIEJzz12jBi3de TSckAu9odiwWBq+GQkpkvHj9UIAB7s4zV7HbW0aud+ggXQv3mainednrwrOnSnqpoilXyJvhhS7/G tlr1Tu+g==; Received: from 54-240-197-227.amazon.com ([54.240.197.227] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1knHDw-0004ls-Go; Thu, 10 Dec 2020 08:22:52 +0000 Message-ID: Subject: Re: [RFC PATCH 1/1] platform-msi: Add platform check for subdevice irq domain From: David Woodhouse To: Lu Baolu , tglx@linutronix.de, ashok.raj@intel.com, kevin.tian@intel.com, dave.jiang@intel.com, megha.dey@intel.com Cc: alex.williamson@redhat.com, bhelgaas@google.com, dan.j.williams@intel.com, dmaengine@vger.kernel.org, eric.auger@redhat.com, jacob.jun.pan@intel.com, jgg@mellanox.com, jing.lin@intel.com, kvm@vger.kernel.org, kwankhede@nvidia.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, maz@kernel.org, mona.hossain@intel.com, netanelg@mellanox.com, parav@mellanox.com, pbonzini@redhat.com, rafael@kernel.org, samuel.ortiz@intel.com, sanjay.k.kumar@intel.com, shahafs@mellanox.com, tony.luck@intel.com, vkoul@kernel.org, yan.y.zhao@linux.intel.com, yi.l.liu@intel.com Date: Thu, 10 Dec 2020 08:22:47 +0000 In-Reply-To: <20201210004624.345282-1-baolu.lu@linux.intel.com> References: <20201210004624.345282-1-baolu.lu@linux.intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Al7fF1WEh4iMueyz+3at" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org --=-Al7fF1WEh4iMueyz+3at Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-12-10 at 08:46 +0800, Lu Baolu wrote: > +/* > + * We want to figure out which context we are running in. But the hardwa= re > + * does not introduce a reliable way (instruction, CPUID leaf, MSR, what= ever) > + * which can be manipulated by the VMM to let the OS figure out where it= runs. > + * So we go with the below probably_on_bare_metal() function as a replac= ement > + * for definitely_on_bare_metal() to go forward only for the very simple= reason > + * that this is the only option we have. > + */ > +static const char * const possible_vmm_vendor_name[] =3D { > + "QEMU", "Bochs", "KVM", "Xen", "VMware", "VMW", "VMware Inc.", > + "innotek GmbH", "Oracle Corporation", "Parallels", "BHYVE", > + "Microsoft Corporation" > +}; People do use SeaBIOS ("Bochs") on bare metal. You'll also see "Amazon EC2" on virt instances as well as bare metal instances. Although in that case I believe the virt instances do have the 'virtual machine' flag set in bit 4 of the BIOS Characteristics Extension Byte 2, and the bare metal obviously don't. --=-Al7fF1WEh4iMueyz+3at Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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