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 4C255C433F5 for ; Tue, 4 Oct 2022 08:23:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229893AbiJDIXS (ORCPT ); Tue, 4 Oct 2022 04:23:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229559AbiJDIXR (ORCPT ); Tue, 4 Oct 2022 04:23:17 -0400 Received: from smtp-fw-80007.amazon.com (smtp-fw-80007.amazon.com [99.78.197.218]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AFD81C123; Tue, 4 Oct 2022 01:23:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1664871796; x=1696407796; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=LJNqYgt9+EkQuB9NNZOVvoJbSMyT9Vb0J5NzwhljRLA=; b=q0H0B+FSadkzka2Eq54Ss01G1ryhNHWnXKA9UGaaeWPBhRAIlO2DAtqp K4z+V6IeLJ/DZRcrtTozrgEEJyWUfZOk0Sfh3OypJ0zzUzcTVLOoeaOmo MZNpUS4cgiV6Uz98duKTlgo/N/EoblQpu4qFjefFDI6TKJKKZ70m9Fw3w k=; X-IronPort-AV: E=Sophos;i="5.93,367,1654560000"; d="scan'208";a="136675810" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO email-inbound-relay-pdx-2c-5c4a15b1.us-west-2.amazon.com) ([10.25.36.214]) by smtp-border-fw-80007.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Oct 2022 08:22:27 +0000 Received: from EX13MTAUWC001.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan2.pdx.amazon.com [10.236.137.194]) by email-inbound-relay-pdx-2c-5c4a15b1.us-west-2.amazon.com (Postfix) with ESMTPS id A219D44FBC; Tue, 4 Oct 2022 08:22:22 +0000 (UTC) Received: from EX19D020UWC004.ant.amazon.com (10.13.138.149) by EX13MTAUWC001.ant.amazon.com (10.43.162.135) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Tue, 4 Oct 2022 08:22:22 +0000 Received: from [10.95.66.18] (10.43.160.124) by EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1118.12; Tue, 4 Oct 2022 08:22:16 +0000 Message-ID: Date: Tue, 4 Oct 2022 10:22:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: [PATCH v2] x86/PCI: Prefer MMIO over PIO on all hypervisor Content-Language: en-US To: Nadav Amit , Vitaly Kuznetsov CC: Ajay Kaher , "x86@kernel.org" , "hpa@zytor.com" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "rostedt@goodmis.org" , Srivatsa Bhat , "srivatsa@csail.mit.edu" , Alexey Makhalov , "Vasavi Sirnapalli" , "er.ajay.kaher@gmail.com" , "willy@infradead.org" , "linux-hyperv@vger.kernel.org" , "kvm@vger.kernel.org" , "jailhouse-dev@googlegroups.com" , "xen-devel@lists.xenproject.org" , "acrn-dev@lists.projectacrn.org" , "helgaas@kernel.org" , "bhelgaas@google.com" , Thomas Gleixner , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "Michael S. Tsirkin" References: <9FEC6622-780D-41E6-B7CA-8D39EDB2C093@vmware.com> <87zgf3pfd1.fsf@redhat.com> <87tu4l9cfm.fsf@redhat.com> <04F550C5-786A-4B8E-9A88-EBFBD8872F16@vmware.com> From: Alexander Graf In-Reply-To: <04F550C5-786A-4B8E-9A88-EBFBD8872F16@vmware.com> X-Originating-IP: [10.43.160.124] X-ClientProxiedBy: EX13D06UWC004.ant.amazon.com (10.43.162.97) To EX19D020UWC004.ant.amazon.com (10.13.138.149) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org SGV5IE5hZGF2LAoKT24gMDMuMTAuMjIgMTk6MzQsIE5hZGF2IEFtaXQgd3JvdGU6Cj4gT24gT2N0 IDMsIDIwMjIsIGF0IDg6MDMgQU0sIFZpdGFseSBLdXpuZXRzb3YgPHZrdXpuZXRzQHJlZGhhdC5j b20+IHdyb3RlOgo+Cj4+IE5vdCBteSBidXQgcmF0aGVyIFBDSSBtYWludGFpbmVyJ3MgY2FsbCBi dXQgSU1ITyBkcm9wcGluZyAnY29uc3QnIGlzCj4+IGJldHRlciwgaW50cm9kdWNpbmcgYSBuZXcg Z2xvYmFsIHZhciBpcyBvdXIgJ2xhc3QgcmVzb3J0JyBhbmQgc2hvdWxkIGJlCj4+IGF2b2lkZWQg d2hlbmV2ZXIgcG9zc2libGUuIEFsdGVybmF0aXZlbHksIHlvdSBjYW4gYWRkIGEKPj4gcmF3X3Bj aV9leHRfb3BzX3ByZWZlcnJlZCgpIGZ1bmN0aW9uIGNoZWNraW5nIHNvbWV0aGluIHdpdGhpbiAn c3RydWN0Cj4+IGh5cGVydmlzb3JfeDg2JyBidXQgSSdtIHVuc3VyZSBpZiBpdCdzIGJldHRlci4K Pj4KPj4gQWxzbywgcGxlYXNlIGNoZWNrIEFsZXgnIHF1ZXN0aW9uL3N1Z2dlc3Rpb24uCj4gSGVy ZSBpcyBteSB0YWtlIChhbmQgQWpheSBrbm93cyBwcm9iYWJseSBtb3JlIHRoYW4gbWUpOgo+Cj4g TG9va2luZyBicmllZmx5IG9uIE1DRkcsIEkgZG8gbm90IHNlZSBhIGNsZWFuIHdheSBvZiB1c2lu ZyB0aGUgQUNQSSB0YWJsZS4KPiBUaGUgdHdvIG9wdGlvbnMgYXJlIGVpdGhlciB0byB1c2UgYSBy ZXNlcnZlZCBmaWVsZCAod2hpY2ggd2hvIGtub3dzLCBtaWdodAo+IGJlIHVzZWQgb25lIGRheSkg b3Igc29tZSBPRU0gSUQuIEkgYW0gYWxzbyBub3QgZmFtaWxpYXIgd2l0aAo+IFBDSV9DT01NQU5E Lk1FTU9SWT0wLCBzbyBBamF5IGNhbiBob3BlZnVsbHkgZ2l2ZSBzb21lIGFuc3dlciBhYm91dCB0 aGF0Lgo+Cj4gQW55aG93LCBJIHVuZGVyc3RhbmQgKGFsdGhvdWdoIG5vdCByZWxhdGUpIHRvIHRo ZSBvYmplY3Rpb24gZm9yIGEgbmV3IGdsb2JhbAo+IHZhcmlhYmxlLiBIb3cgYWJvdXQgZXhwbGlj aXRseSBjYWxsaW5nIHRoaXMgaGFyZHdhcmUgYnVnIGEg4oCcYnVn4oCdIGFuZCB1c2luZwo+IHRo ZSBwcm9wZXIgaW5mcmFzdHJ1Y3R1cmU/IENhbGxpbmcgaXQgZXhwbGljaXRseSBhIGJ1ZyBtYXkg ZXZlbiBwdXNoIHdob2V2ZXIKPiBjYW4gdG8gcmVzb2x2ZSBpdC4KCgpJIGFtIGEgbG90IG1vcmUg Y29uY2VybmVkIHdpdGggaG93IHdlIHByb3BhZ2F0ZSBpdCBleHRlcm5hbGx5IHRoYW4gCndpdGhp biBMaW51eC4gSWYgd2UgaGFyZCBjb2RlIHRoYXQgYWxsIExpbnV4IGtlcm5lbHMgNi4yKyB0aGF0 IGFyZSAKcnVubmluZyBpbiBWTXdhcmUgcHJlZmVyIEVDQU0gb3ZlciBQSU8sIHdlIGxvY2sgb3Vy c2VsdmVzIGludG8gdGhhdCAKc3RhbmNlIGZvciBiZXR0ZXIgb3Igd29yc2UsIHdoaWNoIG1lYW5z OgoKKiBBbGwgcGFzdCBhbmQgZnV0dXJlIHZlcnNpb25zIG9mIGFueSBWTXdhcmUgaHlwZXJ2aXNv ciBwcm9kdWN0IGhhdmUgdG8gCmFsd2F5cyBhbGxvdyBFQ0FNIGFjY2VzcyBmb3IgYW55IFBDSWUg Y29uZmlnIHNwYWNlIHdyaXRlCiogTm8gb3RoZXIgaHlwZXJ2aXNvciBiZW5lZml0cyBmcm9tIGFu eSBvZiB0aGlzIHdpdGhvdXQgdXBzdHJlYW0gY29kZSBjaGFuZ2UKKiBObyByZWFsIGhhcmR3YXJl IHBsYXRmb3JtIGJlbmVmaXRzIGZyb20gdGhpcyB3aXRob3V0IHVwc3RyZWFtIGNvZGUgY2hhbmdl CgpCeSBtb3ZpbmcgaXQgaW50byBNQ0ZHLCB3ZSBjYW4gY3JlYXRlIGEgcGF0aCBmb3IgdGhlIG91 dHNpZGUgZW52aXJvbm1lbnQgCnRvIHRlbGwgdGhlIE9TIHdoZXRoZXIgaXQncyBzYWZlIHRvIHVz ZSBFQ0FNIGFsd2F5cy4gVGhpcyBvYnZpb3VzbHkgCmRvZXNuJ3Qgd29yayB3aXRoIE1DRkcgYXMg aXQgc3RhbmRzIHRvZGF5LCB3ZSdkIGhhdmUgdG8gcHJvcG9zZSBhbiBNQ0ZHIApzcGVjIGNoYW5n ZSB0byB0aGUgUENJIFNJRydzICJQQ0kgRmlybXdhcmUgU3BlY2lmaWNhdGlvbiIgdG8gYWRkIHRo ZSAKcmVzcGVjdGl2ZSBmaWVsZC4gRnV0dXJlIFZNd2FyZSB2ZXJzaW9ucyBjb3VsZCB0aGVuIGFs d2F5cyBleHBvc2UgdGhlIApmbGFnIC0gYW5kIGlmIHlvdSBmaW5kIGl0IGJyb2tlbiwgcmVtb3Zl IGl0IGFnYWluLgoKUHV0dGluZyBhbGwgb2YgdGhlIGxvZ2ljIG9uIHdoaWNoIHN5c3RlbSBwb3Rl bnRpYWxseSBwcmVmZXJzIEVDQU0gb3ZlciAKUElPIGNvbmZpZyBzcGFjZSBhY2Nlc3MgaW50byBM aW51eCBpcyBqdXN0IGEgYmlnIGhhY2sgdGhhdCB3ZSBzaG91bGQgCmF2b2lkIGFzIG11Y2ggYXMg cG9zc2libGUuCgoKQWxleAoKCgoKQW1hem9uIERldmVsb3BtZW50IENlbnRlciBHZXJtYW55IEdt YkgKS3JhdXNlbnN0ci4gMzgKMTAxMTcgQmVybGluCkdlc2NoYWVmdHNmdWVocnVuZzogQ2hyaXN0 aWFuIFNjaGxhZWdlciwgSm9uYXRoYW4gV2Vpc3MKRWluZ2V0cmFnZW4gYW0gQW10c2dlcmljaHQg Q2hhcmxvdHRlbmJ1cmcgdW50ZXIgSFJCIDE0OTE3MyBCClNpdHo6IEJlcmxpbgpVc3QtSUQ6IERF IDI4OSAyMzcgODc5CgoK