From patchwork Fri Dec 20 14:30:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Murray X-Patchwork-Id: 11305629 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B2F366C1 for ; Fri, 20 Dec 2019 14:31:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 91BEB24684 for ; Fri, 20 Dec 2019 14:31:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727572AbfLTObl (ORCPT ); Fri, 20 Dec 2019 09:31:41 -0500 Received: from foss.arm.com ([217.140.110.172]:51332 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728025AbfLTObF (ORCPT ); Fri, 20 Dec 2019 09:31:05 -0500 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 4079811D4; Fri, 20 Dec 2019 06:31:05 -0800 (PST) Received: from e119886-lin.cambridge.arm.com (unknown [10.37.6.20]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5FB2F3F718; Fri, 20 Dec 2019 06:31:03 -0800 (PST) From: Andrew Murray To: Marc Zyngier , Catalin Marinas , Will Deacon Cc: Sudeep Holla , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Rutland Subject: [PATCH v2 15/18] perf: arm_spe: Handle guest/host exclusion flags Date: Fri, 20 Dec 2019 14:30:22 +0000 Message-Id: <20191220143025.33853-16-andrew.murray@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191220143025.33853-1-andrew.murray@arm.com> References: <20191220143025.33853-1-andrew.murray@arm.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org A side effect of supporting the SPE in guests is that we prevent the host from collecting data whilst inside a guest thus creating a black-out window. This occurs because instead of emulating the SPE, we share it with our guests. Let's accurately describe our capabilities by using the perf exclude flags to prevent !exclude_guest and exclude_host flags from being used. Signed-off-by: Andrew Murray --- drivers/perf/arm_spe_pmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c index 2d24af4cfcab..3703dbf459de 100644 --- a/drivers/perf/arm_spe_pmu.c +++ b/drivers/perf/arm_spe_pmu.c @@ -679,6 +679,9 @@ static int arm_spe_pmu_event_init(struct perf_event *event) if (attr->exclude_idle) return -EOPNOTSUPP; + if (!attr->exclude_guest || attr->exclude_host) + return -EOPNOTSUPP; + /* * Feedback-directed frequency throttling doesn't work when we * have a buffer of samples. We'd need to manually count the