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: 13973633 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 530972861CC; Thu, 13 Feb 2025 16:17:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739463454; cv=none; b=LdOt6JWzYuUst+x/r6een8E9iz8vqr6+qkC/ExfsfBoHqiay/cQ2IwBAXubX3ift3y6ot8SgzPvxriX80KaHqxjBuObnJSGp8KCj19zdNDopai6fJJo89zKOZpIy6fA5yOr366O9TIDDPknTvOaGfMFmO79omPVWKNPCrOHFvBk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739463454; c=relaxed/simple; bh=I+uqW9fn3J8TiCxQnKCNml2cNNPv8Ftuwr06Rsc2o1o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e9lOpM1gHebIt6bwW5eQQpHEiI+C/AbXaOYyhfWe2j/yEBgVEH0ZSqrowy/mvWqmI4lubd2S98684sFra1BiPF6d3P/vouQPO+f7H1k42enYrslabq0BQ9SrMQ/xVb3eRSinD53oUpFntC35CBW7u5qeO3lY7pA6XjGbhcNDqA0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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);