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=-10.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 2FAB6C07E96 for ; Tue, 13 Jul 2021 16:15:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 131DA611AB for ; Tue, 13 Jul 2021 16:15:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229445AbhGMQSj (ORCPT ); Tue, 13 Jul 2021 12:18:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40594 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229666AbhGMQSi (ORCPT ); Tue, 13 Jul 2021 12:18:38 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7323AC0613DD for ; Tue, 13 Jul 2021 09:15:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=LQoPboS23ZJWmSVy61Mm/NOINFZejZIfzYMHAqlDOS0=; b=w/jsQrSI7bJ1ZrydFotmRErPM drc4eD9/xShHE8IkaqogtxmHN5jecAuKJe1hm1GnJxVZI+Khij+VACmFAts2xIJmVbR3YB7dWeQtB rAVxHNnrVUqg8xcQbgoZtOWF2WuPgAMssSGfm1kTR6/ZCoOvD1TPh0lXcVW9wQN4saPSvme4wD6c4 IWhlSFvcCRZabQU6yLCEsX3+oSmROYeyyGEvCiZ6o+Sn1TclIMwaEC7OBz/LvArxRyJq2JjtkKXYG 6ogFP2ohLPG23VtH/DfY1wn4GMrcPdgCqLuri45n/qazASEiOX9EifgyxP5LWYTsAcCqYMf1+wUo7 tz0a/f/FQ==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:46060) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m3L4T-0006Iy-PN; Tue, 13 Jul 2021 17:15:45 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1m3L4S-0000SA-Fi; Tue, 13 Jul 2021 17:15:44 +0100 Date: Tue, 13 Jul 2021 17:15:44 +0100 From: "Russell King (Oracle)" To: Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, James Morse , Suzuki K Poulose , Alexandru Elisei , Alexandre Chartre , Robin Murphy , kernel-team@android.com Subject: Re: [PATCH 1/3] KVM: arm64: Narrow PMU sysreg reset values to architectural requirements Message-ID: <20210713161544.GL22278@shell.armlinux.org.uk> References: <20210713135900.1473057-1-maz@kernel.org> <20210713135900.1473057-2-maz@kernel.org> <20210713143949.GJ22278@shell.armlinux.org.uk> <87mtqq6w75.wl-maz@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87mtqq6w75.wl-maz@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: Russell King (Oracle) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, Jul 13, 2021 at 04:59:58PM +0100, Marc Zyngier wrote: > On Tue, 13 Jul 2021 15:39:49 +0100, > "Russell King (Oracle)" wrote: > > > > On Tue, Jul 13, 2021 at 02:58:58PM +0100, Marc Zyngier wrote: > > > +static void reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) > > > +{ > > > + u64 n, mask; > > > + > > > + /* No PMU available, any PMU reg may UNDEF... */ > > > + if (!kvm_arm_support_pmu_v3()) > > > + return; > > > + > > > + n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > > + n &= ARMV8_PMU_PMCR_N_MASK; > > > + > > > + reset_unknown(vcpu, r); > > > + > > > + mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > + if (n) > > > + mask |= GENMASK(n - 1, 0); > > > + > > > + __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > Would this read more logically to structure it as: > > > > mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > > n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > n &= ARMV8_PMU_PMCR_N_MASK; > > if (n) > > mask |= GENMASK(n - 1, 0); > > > > reset_unknown(vcpu, r); > > __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > ? > > Yup, that's nicer. Amended locally. Thanks Marc. For the whole series: Acked-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! 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=-10.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 928B0C07E95 for ; Tue, 13 Jul 2021 16:15:55 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 0701461175 for ; Tue, 13 Jul 2021 16:15:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0701461175 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 674384A19F; 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Tue, 13 Jul 2021 17:15:45 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1m3L4S-0000SA-Fi; Tue, 13 Jul 2021 17:15:44 +0100 Date: Tue, 13 Jul 2021 17:15:44 +0100 From: "Russell King (Oracle)" To: Marc Zyngier Subject: Re: [PATCH 1/3] KVM: arm64: Narrow PMU sysreg reset values to architectural requirements Message-ID: <20210713161544.GL22278@shell.armlinux.org.uk> References: <20210713135900.1473057-1-maz@kernel.org> <20210713135900.1473057-2-maz@kernel.org> <20210713143949.GJ22278@shell.armlinux.org.uk> <87mtqq6w75.wl-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87mtqq6w75.wl-maz@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) Cc: kernel-team@android.com, kvm@vger.kernel.org, Robin Murphy , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Tue, Jul 13, 2021 at 04:59:58PM +0100, Marc Zyngier wrote: > On Tue, 13 Jul 2021 15:39:49 +0100, > "Russell King (Oracle)" wrote: > > > > On Tue, Jul 13, 2021 at 02:58:58PM +0100, Marc Zyngier wrote: > > > +static void reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) > > > +{ > > > + u64 n, mask; > > > + > > > + /* No PMU available, any PMU reg may UNDEF... */ > > > + if (!kvm_arm_support_pmu_v3()) > > > + return; > > > + > > > + n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > > + n &= ARMV8_PMU_PMCR_N_MASK; > > > + > > > + reset_unknown(vcpu, r); > > > + > > > + mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > + if (n) > > > + mask |= GENMASK(n - 1, 0); > > > + > > > + __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > Would this read more logically to structure it as: > > > > mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > > n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > n &= ARMV8_PMU_PMCR_N_MASK; > > if (n) > > mask |= GENMASK(n - 1, 0); > > > > reset_unknown(vcpu, r); > > __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > ? > > Yup, that's nicer. Amended locally. Thanks Marc. For the whole series: Acked-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 86970C07E95 for ; Tue, 13 Jul 2021 16:17:03 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 5329861175 for ; 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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:46060) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m3L4T-0006Iy-PN; Tue, 13 Jul 2021 17:15:45 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1m3L4S-0000SA-Fi; Tue, 13 Jul 2021 17:15:44 +0100 Date: Tue, 13 Jul 2021 17:15:44 +0100 From: "Russell King (Oracle)" To: Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, James Morse , Suzuki K Poulose , Alexandru Elisei , Alexandre Chartre , Robin Murphy , kernel-team@android.com Subject: Re: [PATCH 1/3] KVM: arm64: Narrow PMU sysreg reset values to architectural requirements Message-ID: <20210713161544.GL22278@shell.armlinux.org.uk> References: <20210713135900.1473057-1-maz@kernel.org> <20210713135900.1473057-2-maz@kernel.org> <20210713143949.GJ22278@shell.armlinux.org.uk> <87mtqq6w75.wl-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87mtqq6w75.wl-maz@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210713_091548_470420_CCDDC35A X-CRM114-Status: GOOD ( 12.71 ) 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 Tue, Jul 13, 2021 at 04:59:58PM +0100, Marc Zyngier wrote: > On Tue, 13 Jul 2021 15:39:49 +0100, > "Russell King (Oracle)" wrote: > > > > On Tue, Jul 13, 2021 at 02:58:58PM +0100, Marc Zyngier wrote: > > > +static void reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) > > > +{ > > > + u64 n, mask; > > > + > > > + /* No PMU available, any PMU reg may UNDEF... */ > > > + if (!kvm_arm_support_pmu_v3()) > > > + return; > > > + > > > + n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > > + n &= ARMV8_PMU_PMCR_N_MASK; > > > + > > > + reset_unknown(vcpu, r); > > > + > > > + mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > + if (n) > > > + mask |= GENMASK(n - 1, 0); > > > + > > > + __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > Would this read more logically to structure it as: > > > > mask = BIT(ARMV8_PMU_CYCLE_IDX); > > > > n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; > > n &= ARMV8_PMU_PMCR_N_MASK; > > if (n) > > mask |= GENMASK(n - 1, 0); > > > > reset_unknown(vcpu, r); > > __vcpu_sys_reg(vcpu, r->reg) &= mask; > > > > ? > > Yup, that's nicer. Amended locally. Thanks Marc. For the whole series: Acked-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel