From patchwork Sun Nov 13 16:38:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13041627 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F9C5C4321E for ; Sun, 13 Nov 2022 16:38:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235418AbiKMQi4 (ORCPT ); Sun, 13 Nov 2022 11:38:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235144AbiKMQiw (ORCPT ); Sun, 13 Nov 2022 11:38:52 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BC2B11153 for ; Sun, 13 Nov 2022 08:38:51 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DD15360C37 for ; Sun, 13 Nov 2022 16:38:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26C9DC433D6; Sun, 13 Nov 2022 16:38:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668357530; bh=uaCgmifIBreXTDUwTirUoI4xpqLPVdzhNNhrEj8Q19k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EPwBQ4001rAEaZ18/JxctwXqxfuPJT1Zv9dkjEytDu4tLM2cnjHgqMSOe6TroqiwH xZ/vfQfk+DDV3MJnFWnzy4HxRrHEA5H7u8g1OjooDl4HvBDHaVwWRVip2qt+gCX0CC cTzXX3X+BWyK2toowjqDmRjt2dz2ITX8CFEYfY1LZzOwY4N7kuYTtOnYFlvUmVX0GI yL5TQT3YI/GGXQuhwgKWu6i6sXjBahH6pEFhPPHT45fh7t4a51fiTirYR5ltUPvK+4 f0ysEzdj26RwqGTUoB9gD6eyOdDZo5aEsrL0he5dHrrlGN92l+DMV9sOKAAut5kIDo xQ3OymB6y4qRQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1ouG0O-005oYZ-CT; Sun, 13 Nov 2022 16:38:48 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, , , kvm@vger.kernel.org Cc: James Morse , Suzuki K Poulose , Alexandru Elisei , Oliver Upton , Ricardo Koller , Reiji Watanabe Subject: [PATCH v4 03/16] KVM: arm64: PMU: Always advertise the CHAIN event Date: Sun, 13 Nov 2022 16:38:19 +0000 Message-Id: <20221113163832.3154370-4-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221113163832.3154370-1-maz@kernel.org> References: <20221113163832.3154370-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvmarm@lists.linux.dev, kvm@vger.kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, oliver.upton@linux.dev, ricarkol@google.com, reijiw@google.com 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: kvm@vger.kernel.org Even when the underlying HW doesn't offer the CHAIN event (which happens with QEMU), we can always support it as we're in control of the counter overflow. Always advertise the event via PMCEID0_EL0. Reviewed-by: Reiji Watanabe Signed-off-by: Marc Zyngier --- arch/arm64/kvm/pmu-emul.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 57765be69bea..69b67ab3c4bf 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -701,6 +701,8 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) if (!pmceid1) { val = read_sysreg(pmceid0_el0); + /* always support CHAIN */ + val |= BIT(ARMV8_PMUV3_PERFCTR_CHAIN); base = 0; } else { val = read_sysreg(pmceid1_el0);