From patchwork Fri Oct 4 15:27:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13822600 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CCCEF2141A6; Fri, 4 Oct 2024 15:31:07 +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=1728055869; cv=none; b=gR0b9vuJ2MtsuCQvI9hIW2FQ5p2TYSAXBv3gBZE3v5eLTjScm1OvXKMfhrB6BP+FGzHQQM5clAqp/TRzi4WhfBY7N3lUqPirqBXLXomyUn7zuKnwXvKGxSn60na6JG9hNhR0mruSM5vP6lFvCUId+wqSs+WZpD72lLLgnmGUy+g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728055869; c=relaxed/simple; bh=cjlNC1yB8LiIHiwTGKX4+jA0HaCJVxm035ZwZ4L0kts=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jWQyqC8//UTnd5euHY6ZFl1d1WjiNswzjRhmahALF8GCTBA2CSzD+zg68/bBXGE3dto0YZ7kHmpQPpXCSK6aut6WVj+qFhm835h9PuLrmBUpuiwXzqmyYVmoUDerMYuXZUS4N0bCP2qWCHAg2EkIP+2F8dh0IEX32jDgpqQJFc8= 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 EB2261063; Fri, 4 Oct 2024 08:31:36 -0700 (PDT) Received: from e122027.cambridge.arm.com (unknown [10.1.25.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AEE4A3F640; Fri, 4 Oct 2024 08:31:02 -0700 (PDT) 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 v5 37/43] arm64: RME: Initialize PMCR.N with number counter supported by RMM Date: Fri, 4 Oct 2024 16:27:58 +0100 Message-Id: <20241004152804.72508-38-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241004152804.72508-1-steven.price@arm.com> References: <20241004152804.72508-1-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 2b454ad633a6..d458bcf08423 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -88,6 +88,7 @@ struct realm_rec { void kvm_init_rme(void); u32 kvm_realm_ipa_limit(void); +u8 kvm_realm_max_pmu_counters(void); u64 kvm_realm_reset_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, u64 val); bool kvm_rme_supports_sve(void); diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 7bdf6169812b..ce15b0604c2d 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -911,6 +911,9 @@ 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 5f3abee45bc2..004091d26a88 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -286,6 +286,11 @@ u32 kvm_realm_ipa_limit(void) return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_S2SZ); } +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(struct kvm_vcpu *vcpu, u64 val) { u32 bps = u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_NUM_BPS);