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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A1CAFC43461 for ; Fri, 4 Sep 2020 10:47:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E9D320770 for ; Fri, 4 Sep 2020 10:47:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599216446; bh=4nHSBbyMgtxlkha9Vf0QghUf+TeI3DTxL8ONrKx9s2c=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=yKQ14MMT5TuhYEyTfAS4AqlsLalNdT8BFSHb6YbYiToJNnuam8ZAFvIdzSKvBAPhw oadMnCczFIsT0RjOljtsn+shUN3lsEu4isbdzYpNEhgpV/GzLlJ92wMHa+iwjohyRj tV6/3CMrJ58/ata0o2GelElXABfTlXe+XhTPMp+s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729584AbgIDKrX (ORCPT ); Fri, 4 Sep 2020 06:47:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:59772 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730129AbgIDKrA (ORCPT ); Fri, 4 Sep 2020 06:47:00 -0400 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 75B632087C; Fri, 4 Sep 2020 10:46:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599216419; bh=4nHSBbyMgtxlkha9Vf0QghUf+TeI3DTxL8ONrKx9s2c=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=b1+EqN5K0XdIw62ClzUdadUNLMbJa+VbQ9VyonOrRSbaxr1cvrHQOQUfHvhYnpnNl 3G0ZdrqLwwCVnsghxnoEYKEIDES3WZ9hUAPSuULMdnNexEXXrVtvlk/l1Dybc6cdtK 9wcwQOpZ2m0oJnoJAKb+yUsvhouBax8cj/pplSS8= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=wait-a-minute.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kE9FB-0098sP-Qd; Fri, 04 Sep 2020 11:46:58 +0100 Date: Fri, 04 Sep 2020 11:46:56 +0100 Message-ID: <87r1rh7ra7.wl-maz@kernel.org> From: Marc Zyngier To: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , Andrew Morton , Steven Price Subject: Re: [PATCH v9 04/29] arm64: kvm: mte: Hide the MTE CPUID information from the guests In-Reply-To: <20200904103029.32083-5-catalin.marinas@arm.com> References: <20200904103029.32083-1-catalin.marinas@arm.com> <20200904103029.32083-5-catalin.marinas@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/26.3 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, will@kernel.org, Dave.Martin@arm.com, vincenzo.frascino@arm.com, szabolcs.nagy@arm.com, kevin.brodsky@arm.com, andreyknvl@google.com, pcc@google.com, akpm@linux-foundation.org, steven.price@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: linux-arch-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Fri, 04 Sep 2020 11:30:04 +0100, Catalin Marinas wrote: > > KVM does not support MTE in guests yet, so clear the corresponding field > in the ID_AA64PFR1_EL1 register. In addition, inject an undefined > exception in the guest if it accesses one of the GCR_EL1, RGSR_EL1, > TFSR_EL1 or TFSRE0_EL1 registers. While the emulate_sys_reg() function > already injects an undefined exception, this patch prevents the > unnecessary printk. > > Signed-off-by: Catalin Marinas > Cc: Marc Zyngier > Cc: Steven Price Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.