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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 9DE63C63793 for ; Thu, 22 Jul 2021 15:22:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72C8E61353 for ; Thu, 22 Jul 2021 15:22:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232317AbhGVOl7 (ORCPT ); Thu, 22 Jul 2021 10:41:59 -0400 Received: from foss.arm.com ([217.140.110.172]:54718 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232576AbhGVOly (ORCPT ); Thu, 22 Jul 2021 10:41:54 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BCA88106F; Thu, 22 Jul 2021 08:22:28 -0700 (PDT) Received: from [10.57.7.91] (unknown [10.57.7.91]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6E3563F694; Thu, 22 Jul 2021 08:22:27 -0700 (PDT) Subject: Re: [PATCH v2 3/3] kvm/arm: Align the VMID allocation with the arm64 ASID one To: Will Deacon , Shameerali Kolothum Thodi Cc: "jean-philippe@linaro.org" , "maz@kernel.org" , "linux-kernel@vger.kernel.org" , Linuxarm , "catalin.marinas@arm.com" , "kvmarm@lists.cs.columbia.edu" , "linux-arm-kernel@lists.infradead.org" References: <20210616155606.2806-1-shameerali.kolothum.thodi@huawei.com> <20210616155606.2806-4-shameerali.kolothum.thodi@huawei.com> <20210721163138.GD11003@willie-the-truck> <20210722095010.GA12012@willie-the-truck> From: Vladimir Murzin Message-ID: <43b32e77-52b1-8524-63a1-c99578c2dd1d@arm.com> Date: Thu, 22 Jul 2021 16:22:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20210722095010.GA12012@willie-the-truck> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/22/21 10:50 AM, Will Deacon wrote: > As an aside: I'm more and more inclined to rip out the CnP stuff given > that it doesn't appear to being any benefits, but does have some clear > downsides. Perhaps something for next week. Can you please clarify what do you mean by "it doesn't appear to being any benefits"? IIRC, Cortex-A65 implements CnP hint and I've heard that some payloads seen improvement... Cheers Vladimir