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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 E04DCC18E5A for ; Wed, 11 Mar 2020 09:12:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A54DC21D7E for ; Wed, 11 Mar 2020 09:12:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ILo3w++e" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A54DC21D7E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 365F16B0003; Wed, 11 Mar 2020 05:12:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3149E6B0006; Wed, 11 Mar 2020 05:12:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 22B4C6B0007; Wed, 11 Mar 2020 05:12:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0207.hostedemail.com [216.40.44.207]) by kanga.kvack.org (Postfix) with ESMTP id 093DE6B0003 for ; Wed, 11 Mar 2020 05:12:58 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 8D306824805A for ; Wed, 11 Mar 2020 09:12:57 +0000 (UTC) X-FDA: 76582516794.13.light52_8e368e694a701 X-HE-Tag: light52_8e368e694a701 X-Filterd-Recvd-Size: 3680 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf04.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Mar 2020 09:12:57 +0000 (UTC) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4CB812146E; Wed, 11 Mar 2020 09:12:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583917976; bh=JmnH83cEqMuYqwzSAJmmIggEZjH2zaw0Mir9SbgqzBg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ILo3w++eSM5mDVtsHN7CfbOR+uFkOP8FGJV4g+jMwBHXf7Gp1Oq+92oifNxxhL+rA yGwUU0UbGeQwBbvp1Q38b4ryrd9AdHkucGojc6tgmNRWfgs46M7A/Cyb3wJUGk6Z8Y lVUKVDQ56EDE59d8xVIZCG7rSZjnK0cvMv158vw0= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1jBxQ6-00BrX3-KP; Wed, 11 Mar 2020 09:12:54 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Wed, 11 Mar 2020 09:12:54 +0000 From: Marc Zyngier To: Zhenyu Ye Cc: mark.rutland@arm.com, catalin.marinas@arm.com, will@kernel.org, aneesh.kumar@linux.ibm.com, steven.price@arm.com, broonie@kernel.org, guohanjun@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, arm@kernel.org, xiexiangyou@huawei.com, prime.zeng@hisilicon.com Subject: Re: [RFC PATCH v1 0/3] arm64: tlb: add support for TTL field In-Reply-To: <20200311025309.1743-1-yezhenyu2@huawei.com> References: <20200311025309.1743-1-yezhenyu2@huawei.com> Message-ID: <247ad619edf17eb266f856d937dac826@kernel.org> X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: yezhenyu2@huawei.com, mark.rutland@arm.com, catalin.marinas@arm.com, will@kernel.org, aneesh.kumar@linux.ibm.com, steven.price@arm.com, broonie@kernel.org, guohanjun@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, arm@kernel.org, xiexiangyou@huawei.com, prime.zeng@hisilicon.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Zhenyu, On 2020-03-11 02:53, Zhenyu Ye wrote: > ARMv8.4-TTL provides the TTL field in tlbi instruction to indicate > the level of translation table walk holding the leaf entry for the > address that is being invalidated. Hardware can use this information > to determine if there was a risk of splintering. > > This set of patches adds TTL field to __TLBI_ADDR, and uses > Architecture-specific MM context to pass the TTL value to tlb > interface. > > The default value of TTL is 0, which will not have any impact on the > TLB maintenance instructions. The last patch trys to use TTL field in > some obviously tlb-flush interface. I have already posted some support for ARMv8.4-TTL as part of my NV series [1], patches 62, 67, 68 and 69. This only deals with Stage-2 translation so far. If you intend to add Stage-1, please build on top of what I have already posted (I can extract the patches on a separate branch if you want). Thanks, M. [1] https://lore.kernel.org/linux-arm-kernel/20200211174938.27809-1-maz@kernel.org/ -- Jazz is not dead. It just smells funny...