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=-9.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 7A7D3C433E1 for ; Tue, 23 Mar 2021 09:17:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E00F619BF for ; Tue, 23 Mar 2021 09:17:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229666AbhCWJRU (ORCPT ); Tue, 23 Mar 2021 05:17:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:58882 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229979AbhCWJRC (ORCPT ); Tue, 23 Mar 2021 05:17:02 -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 0F1ED61990; Tue, 23 Mar 2021 09:17:02 +0000 (UTC) Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1lOd9n-003GRa-JN; Tue, 23 Mar 2021 09:17:00 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 23 Mar 2021 09:16:59 +0000 From: Marc Zyngier To: Suzuki K Poulose Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org, mike.leach@linaro.org, anshuman.khandual@arm.com, leo.yan@linaro.org, Will Deacon , Mark Rutland , Catalin Marinas , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v4 05/19] kvm: arm64: Disable guest access to trace filter controls In-Reply-To: References: <20210225193543.2920532-1-suzuki.poulose@arm.com> <20210225193543.2920532-6-suzuki.poulose@arm.com> User-Agent: Roundcube Webmail/1.4.11 Message-ID: <8cb6eced29d9749d88af6f6d2f649019@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: suzuki.poulose@arm.com, linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org, mike.leach@linaro.org, anshuman.khandual@arm.com, leo.yan@linaro.org, will@kernel.org, mark.rutland@arm.com, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Suzuki, On 2021-03-22 22:24, Suzuki K Poulose wrote: > Hi Marc, > > On 25/02/2021 19:35, Suzuki K Poulose wrote: >> Disable guest access to the Trace Filter control registers. >> We do not advertise the Trace filter feature to the guest >> (ID_AA64DFR0_EL1: TRACE_FILT is cleared) already, but the guest >> can still access the TRFCR_EL1 unless we trap it. >> >> This will also make sure that the guest cannot fiddle with >> the filtering controls set by a nvhe host. >> >> Cc: Marc Zyngier >> Cc: Will Deacon >> Cc: Mark Rutland >> Cc: Catalin Marinas >> Signed-off-by: Suzuki K Poulose > > We have already have the v8.4 self hosted tracing support in 5.12-rcX. > Do you think you can pick this up for this 5.12 ? Sure, no problem. Shall I pick patch #3 at the same time? Thanks, M. -- Jazz is not dead. It just smells funny...