From nobody Mon Apr 6 18:23:58 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DB0FE40B6EE; Wed, 18 Mar 2026 15:56:54 +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=1773849418; cv=none; b=fJVAk6RISE+UUfXoPf8iWkYimi6XP2SvbGXt2thosKwrHu5+T4AO0fS0koDWeWAE+/Jft5hGXgyopVNBOmUnFHlWNns4GW12P0DszTBNkqlJtBIPVfz6+2EPHeccTaCptoPbyCNZFsnlWVuQhegX16NYvVDjuPIeQQawkuXOqME= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773849418; c=relaxed/simple; bh=LAYtWY+T6JYDvY0OsiJokbXIf6tHeet8eu5/NStZLas=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=m3pZ+LowlsrmejapvpwBjh08UEKn9j4sw13yCWXpC3T8kbWMJTdZQ8uliZ0yo9QjLVZAfekU7ie7sVmyslm5KgyvqlUVW/IgMZ/OHvin//2JEs6uyhtNz+6T1uSh44qZSHMdkj/EIO+cr+Gja1Y9trsG2wMSIeuayhfeJ3k4wy0= 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 19FA52050; Wed, 18 Mar 2026 08:56:48 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.61.122]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D1DB83F73B; Wed, 18 Mar 2026 08:56:50 -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" , Emi Kisanuki , Vishal Annapurve , Steven Price Subject: [PATCH v13 41/48] arm64: RMI: Initialize PMCR.N with number counter supported by RMM Date: Wed, 18 Mar 2026 15:54:05 +0000 Message-ID: <20260318155413.793430-42-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260318155413.793430-1-steven.price@arm.com> References: <20260318155413.793430-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Gavin Shan Reviewed-by: Suzuki K Poulose Reviewed-by: Joey Gouly --- arch/arm64/include/asm/kvm_rmi.h | 1 + arch/arm64/kvm/pmu-emul.c | 3 +++ arch/arm64/kvm/rmi.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_= rmi.h index 8fb526764c30..8f871daf6540 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -86,6 +86,7 @@ struct realm_rec { =20 void kvm_init_rmi(void); u32 kvm_realm_ipa_limit(void); +u8 kvm_realm_max_pmu_counters(void); =20 u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val); =20 diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 450b0eac20f8..9d8bc26c5c69 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -1014,6 +1014,9 @@ u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm) { struct arm_pmu *arm_pmu =3D kvm->arch.arm_pmu; =20 + if (kvm_is_realm(kvm)) + return kvm_realm_max_pmu_counters(); + /* * PMUv3 requires that all event counters are capable of counting any * event, though the same may not be true of non-PMUv3 hardware. diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 76ff00488883..f29c04d2318a 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -212,6 +212,11 @@ u32 kvm_realm_ipa_limit(void) return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_S2SZ); } =20 +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 =3D u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_NUM_BPS); --=20 2.43.0