From patchwork Thu Feb 13 16:14:17 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13973764 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 8341DC021A0 for ; Thu, 13 Feb 2025 17:19:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ziTgsjg7bQ4vQK22rPGnbX0iW0OB4Q8kXETZxEh5n7g=; b=Li2O/jvrM9UtDDLnhAWEjCSeja yt1LFxI0xHh9PDaBqBLpMy4N14PXWVHyr7GiaexyV1yAC66B73TO39cyG1Tca5eJA89ehvxDjNs/N ya3nzpzovs5R4bGIgqC89uHHbnyTA3oRNnmTZU3Di4G2VKyMvWRV2FRmU41QmkZgWa2jdClZM0gZB A8LsCqyMe58obkl8NouxyUG/caQN2Lzfz5xG50l+31//ydjwuMjEj0an2XADk4/8fklVUmG5rwZ80 hl3F+bZDxIHY77OH+pAiJNhArxIOK8xvncGkC6ADPf0Vtv3ahQmqX7mkiEsXffiSyiJvxof0OcpUX 9Ec3nYzA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1ticsH-0000000Bz2O-46Nv; Thu, 13 Feb 2025 17:19:41 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tibu9-0000000BjB0-1fmp for linux-arm-kernel@lists.infradead.org; Thu, 13 Feb 2025 16:17:34 +0000 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 964F01756; Thu, 13 Feb 2025 08:17:53 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.32.44]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7900C3F6A8; Thu, 13 Feb 2025 08:17:28 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Jean-Philippe Brucker , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Steven Price Subject: [PATCH v7 37/45] arm64: RME: Initialize PMCR.N with number counter supported by RMM Date: Thu, 13 Feb 2025 16:14:17 +0000 Message-ID: <20250213161426.102987-38-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250213161426.102987-1-steven.price@arm.com> References: <20250213161426.102987-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250213_081733_488583_E1819B1F X-CRM114-Status: GOOD ( 10.02 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Jean-Philippe Brucker Provide an accurate number of available PMU counters to userspace when setting up a Realm. Signed-off-by: Jean-Philippe Brucker Signed-off-by: Steven Price --- arch/arm64/include/asm/kvm_rme.h | 1 + arch/arm64/kvm/pmu-emul.c | 3 +++ arch/arm64/kvm/rme.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h index 67ee38541a82..8a8ec70f3626 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -84,6 +84,7 @@ struct realm_rec { void kvm_init_rme(void); u32 kvm_realm_ipa_limit(void); u32 kvm_realm_vgic_nr_lr(void); +u8 kvm_realm_max_pmu_counters(void); u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val); diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 670e5d15ad92..76ce59541e0f 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -997,6 +997,9 @@ u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm) { struct arm_pmu *arm_pmu = kvm->arch.arm_pmu; + if (kvm_is_realm(kvm)) + return kvm_realm_max_pmu_counters(); + /* * The arm_pmu->cntr_mask considers the fixed counter(s) as well. * Ignore those and return only the general-purpose counters. diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index f236e1776d8c..f620a64551d9 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -87,6 +87,11 @@ u32 kvm_realm_vgic_nr_lr(void) return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_GICV3_NUM_LRS); } +u8 kvm_realm_max_pmu_counters(void) +{ + return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_PMU_NUM_CTRS); +} + u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val) { u32 bps = u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_NUM_BPS);