Received: by 2002:a05:6a10:1287:0:0:0:0 with SMTP id d7csp623732pxv; Thu, 22 Jul 2021 08:24:03 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxav4HKPXPtpitZ89maTuXEGbnXJEko+DRLffR3+sH80q8FAI5zm5Kla8B5uHw7qCv3Op04 X-Received: by 2002:a92:3f08:: with SMTP id m8mr265467ila.104.1626967442835; Thu, 22 Jul 2021 08:24:02 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1626967442; cv=none; d=google.com; s=arc-20160816; b=bo1ag4ptaNMYElxXAdzI2yUAZlUPSciT3btg+LrENbILJ2u+H3I4k/Kzq/kBaF9HU5 pxjykIuf7oPNTOkjyQdcJPL4zq756YYo8q+zc4YZ+ZWxcyK/b8MVeNQ59Qo5COPZ+ou3 MPeyMN3Aal6YAGnlLfN0om3uSSOGCBTUTfrQhPBPzaS0tLuH2CyD19EqQCGuy7Tl6NUG mQO55sR+niNdGXboqKDe8Visuanvilcr5BTnYFUYaV6Mi7PSl7sk6j2lTn6AXsHuhBnV b9kC8t5ktdr0e3P07aFOdV7W+IthJkVha0W18rVvdmIYHfKDsGw7w0/QHYKZsqV7K33b pozA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject; bh=frjtaTNd9jAKnYczCQAssTK6LFFKnFxuiA8fKBt1qcM=; b=ffXDIayaG3kAV0+9FZGP53ysDz78JMCxNv8Rd+tJJIDgzrVJyCEX9BYLN5MTPq2psW 1MYbgg/PE3RkxebKr/eXMgovrIWDUxQKqgt3IYbueG1/x8K8epK6ZdBoQlQm/nB8APUg I/rh2RU1q2lx9LEXbjCq5UqB0OaatXeDMtqsWeuI8C7zmDkiL5VSABlMpLEQxxFfTr8q qswvbCswOW93RbN08VwEYXiOesisrav6chuBYDoD31Z1pxxsvatHfQmBitiSEM25uq+b PrzQPIFrskJA/I731m7hILbRGM6zQTRj4PwHnC4hZSkponjALnKLt4vvLiOIdWRvDyHG kOgA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id h41si9105826jaa.50.2021.07.22.08.23.50; Thu, 22 Jul 2021 08:24:02 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232616AbhGVOl7 (ORCPT + 99 others); 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