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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95058C43217 for ; Mon, 7 Nov 2022 08:55:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231403AbiKGIzH (ORCPT ); Mon, 7 Nov 2022 03:55:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231490AbiKGIzB (ORCPT ); Mon, 7 Nov 2022 03:55:01 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A80525F6C for ; Mon, 7 Nov 2022 00:55:00 -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 ams.source.kernel.org (Postfix) with ESMTPS id 4D34DB80E70 for ; Mon, 7 Nov 2022 08:54:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0108DC433D6; Mon, 7 Nov 2022 08:54:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667811298; bh=7DPVNhiI7e1H2rXRI4KKeHqneAlTPa1uIRZNpUo176c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XntbvzAdAajcxaf72wgefnCfBuLh11LAXu4AeSKuiiYYNpsPAnIaSGqLNiSpTH8/F toq1XEPrO9W+6x9YPXRB6p8stq+rzwAIQ+YpijCiyzL/fTVLU1XQ49J9zxISNeczhZ 23gEQjLvhWI80QUERufiCbdUysDaamOYv1Ul5IZboqbc8SY4K4KVIUwOlVU/FFEKpO G6kNj4ACzXhpQp7qhLOfk+P0iwrtDyTXwwBFroMZrNXDa6Ue2KAwaOghd9ZzUvvErh ycGk/X3sxSD6nbx1ymTGnQ7MQdp0TsKk3viaDx89FYo8ux3L0oOogS2vRUAO0+RRKe eN78PPvzutJyg== 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 1orxuC-004KxX-0f; Mon, 07 Nov 2022 08:54:56 +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 v3 03/14] KVM: arm64: PMU: Always advertise the CHAIN event Date: Mon, 7 Nov 2022 08:54:24 +0000 Message-Id: <20221107085435.2581641-4-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221107085435.2581641-1-maz@kernel.org> References: <20221107085435.2581641-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. 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 a38b3127f649..e63ed0c71a37 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -703,6 +703,8 @@ 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); -- 2.34.1