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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9FAB9C4828D for ; Mon, 5 Feb 2024 13:21:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cG6nmJTrvh7/oj/EIefEWr+e+7tPFcw9+YtcmzM/qgg=; b=EGHiipl8A+3p3W teo6usgmdulpb8yE3w9fSTCQB3/1UmbXrMmTSXoWXFPArWVA/v6Ij1F/0bPQ4OMlAvnxrbk1+R/Uu PdVSsd+JOdkNRtriDPhlQgoCIrCsz2H8CoziGdKBvg1tIwMJrolfwCTTMo4P6YZTB1cA/wTt2EV0q iFpz0uXI8gmOGLoIln66iagPCqUKuzBnFosaFBcJL8o/7lQhSRx6L9AKnLQNPmVOfbwbVChBTTHSM D+ClVqgJ/Fv69roH0o4BUoNT9m1MIwgtCh2WTEq//DiwtRAtOJjFhESHhM9TnoB1JogRqhDYQ7e/D J2ZTF5CDClRCXuLNl6bA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWyul-00000003OSl-1ouQ; Mon, 05 Feb 2024 13:21:35 +0000 Received: from out-178.mta1.migadu.com ([2001:41d0:203:375::b2]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWyui-00000003ORn-0xC2 for linux-arm-kernel@lists.infradead.org; Mon, 05 Feb 2024 13:21:33 +0000 Date: Mon, 5 Feb 2024 13:21:26 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1707139289; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=r8wLnWWA4PkBzsgde5n7CqFtTqXJKCoOlinRqF4VWvs=; b=YbgN3AeYOgNDxaxv3aL5Fi28ARY/eOEICeZpSZRF0YfQU1YAdGSQfeldDujThmMNVzkW2y 30AMFFza0kmkbbJaalH9ea8uNYwRzjjABMlX74rwrM1rqkPl9nnwfsR+UVZlgwsd2NQw6B kIbtuNJxoUI8q6fyV5ZW3UenW76RkIM= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Oliver Upton To: Marc Zyngier Cc: James Clark , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, broonie@kernel.org, suzuki.poulose@arm.com, acme@kernel.org, James Morse , Zenghui Yu , Catalin Marinas , Will Deacon , Mike Leach , Leo Yan , Alexander Shishkin , Anshuman Khandual , Rob Herring , Miguel Luis , Jintack Lim , Ard Biesheuvel , Mark Rutland , Arnd Bergmann , Vincent Donnefort , Kristina Martsenko , Fuad Tabba , Joey Gouly , Akihiko Odaki , Jing Zhang , linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 2/7] arm64: KVM: Use shared area to pass PMU event state to hypervisor Message-ID: References: <20240104162714.1062610-1-james.clark@arm.com> <20240104162714.1062610-3-james.clark@arm.com> <8a908ee8-620a-d9c2-734b-5a6402950072@arm.com> <867cjj6ohz.wl-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <867cjj6ohz.wl-maz@kernel.org> X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240205_052132_424899_945CC383 X-CRM114-Status: GOOD ( 14.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Feb 05, 2024 at 01:15:36PM +0000, Marc Zyngier wrote: > On Mon, 05 Feb 2024 13:04:51 +0000, > Oliver Upton wrote: > > > > Unless someone has strong opinions about making this work in protected > > mode, I am happy to see tracing support limited to the 'normal' nVHE > > configuration. The protected feature as a whole is just baggage until > > upstream support is completed. > > Limiting tracing to non-protected mode is a must IMO. Allowing tracing > when pKVM is enabled is a sure way to expose secrets that should > stay... secret. The only exception I can think of is when > CONFIG_NVHE_EL2_DEBUG is enabled, at which point all bets are off. Zero argument there :) I left off the "and PMU" part of what I was saying, because that was a feature that semi-worked in protected mode before VM/VCPU shadowing support landed. -- Thanks, Oliver _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel