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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58E90C4332F for ; Sun, 13 Nov 2022 16:38:58 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F0C7E4B943; Sun, 13 Nov 2022 11:38:57 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w47VxVdBJVU3; Sun, 13 Nov 2022 11:38:57 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A26224B96B; Sun, 13 Nov 2022 11:38:55 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EAB704B928 for ; Sun, 13 Nov 2022 11:38:53 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 84659Tfztpkk for ; Sun, 13 Nov 2022 11:38:51 -0500 (EST) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id E379D4B879 for ; Sun, 13 Nov 2022 11:38:51 -0500 (EST) 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 5333560C3B; Sun, 13 Nov 2022 16:38:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8BED4C4347C; 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=i6EbkWxG0QBBSP86CJx06YA0tn2k0Yt3SekpMFHAmT4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FtYd312tuTt5BsBBhM7K5n75pKQwN44zk5mdAwBODYKhrLe6yJwBTNM6oRIGECBqs dOsEDEv6sfsi2AXfrknGM822HaAhxCM52mq+B8OvrQOXQEYTeL8R+6PlDnryM3Moky YvNSfF/kqj0lhdLcog7ARk7/GZ7jXsa9WXsgAznBFaNkjV3hDuiNn1i5daIGAPOm2n vYFyGiqaAR3zL8mGB/I2jHZ4I926TWZxIwMYl/y7CvK9TdCggd0grLOKXTJHQ/PBnr mAsBFLT+GS4jPhRUmwx4fyWL7NwC197NQoTLXyNL6eMnymWUX9j9w5Obnp6Nf/Qo9/ FifAqel5uDN8g== 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-PR; Sun, 13 Nov 2022 16:38:48 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, , , kvm@vger.kernel.org Subject: [PATCH v4 05/16] KVM: arm64: PMU: Narrow the overflow checking when required Date: Sun, 13 Nov 2022 16:38:21 +0000 Message-Id: <20221113163832.3154370-6-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 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 For 64bit counters that overflow on a 32bit boundary, make sure we only check the bottom 32bit to generate a CHAIN event. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/pmu-emul.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index d050143326b5..9e6bc7edc4de 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -417,7 +417,8 @@ static void kvm_pmu_counter_increment(struct kvm_vcpu *vcpu, reg = lower_32_bits(reg); __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg; - if (reg) /* No overflow? move on */ + /* No overflow? move on */ + if (kvm_pmu_idx_has_64bit_overflow(vcpu, i) ? reg : lower_32_bits(reg)) continue; /* Mark overflow */ -- 2.34.1 _______________________________________________ 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 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 92F6B46B6 for ; Sun, 13 Nov 2022 16:38:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8BED4C4347C; 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=i6EbkWxG0QBBSP86CJx06YA0tn2k0Yt3SekpMFHAmT4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FtYd312tuTt5BsBBhM7K5n75pKQwN44zk5mdAwBODYKhrLe6yJwBTNM6oRIGECBqs dOsEDEv6sfsi2AXfrknGM822HaAhxCM52mq+B8OvrQOXQEYTeL8R+6PlDnryM3Moky YvNSfF/kqj0lhdLcog7ARk7/GZ7jXsa9WXsgAznBFaNkjV3hDuiNn1i5daIGAPOm2n vYFyGiqaAR3zL8mGB/I2jHZ4I926TWZxIwMYl/y7CvK9TdCggd0grLOKXTJHQ/PBnr mAsBFLT+GS4jPhRUmwx4fyWL7NwC197NQoTLXyNL6eMnymWUX9j9w5Obnp6Nf/Qo9/ FifAqel5uDN8g== 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-PR; 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 05/16] KVM: arm64: PMU: Narrow the overflow checking when required Date: Sun, 13 Nov 2022 16:38:21 +0000 Message-ID: <20221113163832.3154370-6-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> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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 Message-ID: <20221113163821.GHLX8dNCq757J4vIs2Vubim73YWtQLubdbCrfAdt_Js@z> For 64bit counters that overflow on a 32bit boundary, make sure we only check the bottom 32bit to generate a CHAIN event. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/pmu-emul.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index d050143326b5..9e6bc7edc4de 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -417,7 +417,8 @@ static void kvm_pmu_counter_increment(struct kvm_vcpu *vcpu, reg = lower_32_bits(reg); __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg; - if (reg) /* No overflow? move on */ + /* No overflow? move on */ + if (kvm_pmu_idx_has_64bit_overflow(vcpu, i) ? reg : lower_32_bits(reg)) continue; /* Mark overflow */ -- 2.34.1