From nobody Tue Feb 10 22:00:10 2026 Received: from mail-oo1-f74.google.com (mail-oo1-f74.google.com [209.85.161.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B48523176EB for ; Mon, 9 Feb 2026 22:40:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770676847; cv=none; b=P9o0JsVdfSE1HQklh2eIs28a158lMTnx6Yx/uCP9Gw4PShuo8lA9JjDJlmG/9HioMHYAs2z05r2VSn2L625fSMy5tWRoKUKVjL/PDgkBvavFl2F7TzVhTFa+voRwiRxdrKB7BXWllvLBJx52vzSAxHQlPhEPJie2GyioHb3MrAY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770676847; c=relaxed/simple; bh=6+/AAsrIcJ/tlip7YRHDsjoPFsDxdedlbrM0lqMPkcI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=KX8rnpJIiQ73wjfSDn2bGGpg0ZAk88ZUIDL9ndv1WFeerq5cAmbLr5rgDsK+W24Uxdam9U/yQ1hZiYgbhjxDbDBT2lMsuvxt1duH6U6nmrDpjqYFJCFipVLJPKIOYEMM1/bx5Pbr3IMhfWDvqz0QcPDobbBICJq2euKSbk+ZIHE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--coltonlewis.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=omAswZb5; arc=none smtp.client-ip=209.85.161.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--coltonlewis.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="omAswZb5" Received: by mail-oo1-f74.google.com with SMTP id 006d021491bc7-6630d58662aso1420247eaf.0 for ; Mon, 09 Feb 2026 14:40:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1770676845; x=1771281645; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=iRE+uiZ0XUNzFGmxnXVrfreBhjJPUlvjb1s52PGeIK4=; b=omAswZb566EMnpAmqCd+XqybWKN04qDDUrYy76S7aZy77qMqpscdVzb/Vz7F8lmUft 3UVkv2E8jnXFgitrE5Jsr3Y/Px++T9H1wBsRTbiyNFfUuVjSNKE3/B8I+C4dDHux2aob ASGUEguW8TbH6qcs065+ciu2mW/OR5mTxqDr3oTe+VGBSkYshszX0V0ydbwSQW4dwTM+ iCM3KQOg9kfRAiQpnZv1ittXdoo0PI3KHhIFkCQyeZhdHALRZy+FWQIMs0CJ92KtSMEL S+S0r2nkA3AyZ0kaHy9ueGxkIX3IM2feyIONtaEQeN2owvKrrbm2OQvoScSo/RFfrFUN 0e0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770676845; x=1771281645; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=iRE+uiZ0XUNzFGmxnXVrfreBhjJPUlvjb1s52PGeIK4=; b=S5RTPgJ7NCRuasxou/JRbTQS3WU1SRNvIOLjAtDup4FLc7BjzGavoDoV/ERhuw9jx5 prgVjLu+98GPAg+hyctwx1zpFcOb7N96QyFbVYHtpoGD+9rJeFIov83tHvfAifh+J4DW YjR0aYpGi0c25WS1MDLTWt6m0D8yLPpbWKUt13aXwmI8Ox+mPGCzcG9/pLU8lESQD1p7 SzXJK6i78D04XdYtq0XFw5ReEZR3qZAwmeoPqrYLrProsr3Yr6Gh2iP2YuD+DTYQDV6v U8IfUB3WlqCSfEH0h8RivieeqzzH2r2TEaU+AjBbKg51vb8MCX8JIDHtat/7AFrvlbmy 03ZA== X-Forwarded-Encrypted: i=1; AJvYcCUGokpLp+9NnX6a0NSbBHwl5GseYAC/vLlXUWa4Pa2+JFS2NI49XyZQuGLVO3PrQl1QI341BFukuWg0A2Q=@vger.kernel.org X-Gm-Message-State: AOJu0Yx5pNqan1edqJkOO0FbZzlZlmcFn7Ft5ltsJJgeuDWY8/lwLtsR dZW9PzZ8pt1xhZv16mEdVs7Mgskn7ERhb85E+8yGb0t6XpItQE32232X1dlLck6TYLA5ISu7hzb lpB2PNtPhi1Omp0DiIaCm8fkDzQ== X-Received: from jamu20.prod.google.com ([2002:a02:c054:0:b0:5ca:f895:d041]) (user=coltonlewis job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6820:4b17:b0:663:93:5146 with SMTP id 006d021491bc7-66d0bdae77emr5791796eaf.43.1770676844869; Mon, 09 Feb 2026 14:40:44 -0800 (PST) Date: Mon, 9 Feb 2026 22:13:56 +0000 In-Reply-To: <20260209221414.2169465-1-coltonlewis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260209221414.2169465-1-coltonlewis@google.com> X-Mailer: git-send-email 2.53.0.rc2.204.g2597b5adb4-goog Message-ID: <20260209221414.2169465-2-coltonlewis@google.com> Subject: [PATCH v6 01/19] arm64: cpufeature: Add cpucap for HPMN0 From: Colton Lewis To: kvm@vger.kernel.org Cc: Alexandru Elisei , Paolo Bonzini , Jonathan Corbet , Russell King , Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Mingwei Zhang , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Mark Rutland , Shuah Khan , Ganapatrao Kulkarni , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-perf-users@vger.kernel.org, linux-kselftest@vger.kernel.org, Colton Lewis Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a capability for FEAT_HPMN0, whether MDCR_EL2.HPMN can specify 0 counters reserved for the guest. This required changing HPMN0 to an UnsignedEnum in tools/sysreg because otherwise not all the appropriate macros are generated to add it to arm64_cpu_capabilities_arm64_features. Acked-by: Mark Rutland Reviewed-by: Suzuki K Poulose Signed-off-by: Colton Lewis --- arch/arm64/kernel/cpufeature.c | 8 ++++++++ arch/arm64/kvm/sys_regs.c | 3 ++- arch/arm64/tools/cpucaps | 1 + arch/arm64/tools/sysreg | 6 +++--- 4 files changed, 14 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index c840a93b9ef95..e6a8373d8625b 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -555,6 +555,7 @@ static const struct arm64_ftr_bits ftr_id_mmfr0[] =3D { }; =20 static const struct arm64_ftr_bits ftr_id_aa64dfr0[] =3D { + ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1= _HPMN0_SHIFT, 4, 0), S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_= DoubleLock_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1= _PMSVer_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64DFR0_EL1_CT= X_CMPs_SHIFT, 4, 0), @@ -2950,6 +2951,13 @@ static const struct arm64_cpu_capabilities arm64_fea= tures[] =3D { .matches =3D has_cpuid_feature, ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, FGT2) }, + { + .desc =3D "HPMN0", + .type =3D ARM64_CPUCAP_SYSTEM_FEATURE, + .capability =3D ARM64_HAS_HPMN0, + .matches =3D has_cpuid_feature, + ARM64_CPUID_FIELDS(ID_AA64DFR0_EL1, HPMN0, IMP) + }, #ifdef CONFIG_ARM64_SME { .desc =3D "Scalable Matrix Extension", diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 88a57ca36d96c..a460e93b1ad0a 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -3229,7 +3229,8 @@ static const struct sys_reg_desc sys_reg_descs[] =3D { ID_AA64DFR0_EL1_DoubleLock_MASK | ID_AA64DFR0_EL1_WRPs_MASK | ID_AA64DFR0_EL1_PMUVer_MASK | - ID_AA64DFR0_EL1_DebugVer_MASK), + ID_AA64DFR0_EL1_DebugVer_MASK | + ID_AA64DFR0_EL1_HPMN0_MASK), ID_SANITISED(ID_AA64DFR1_EL1), ID_UNALLOCATED(5,2), ID_UNALLOCATED(5,3), diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 0fac75f015343..1e3f6e9cc2c86 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -42,6 +42,7 @@ HAS_GIC_PRIO_MASKING HAS_GIC_PRIO_RELAXED_SYNC HAS_ICH_HCR_EL2_TDIR HAS_HCR_NV1 +HAS_HPMN0 HAS_HCX HAS_LDAPR HAS_LPA2 diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg index 8921b51866d64..c9cf3d139c2da 100644 --- a/arch/arm64/tools/sysreg +++ b/arch/arm64/tools/sysreg @@ -1666,9 +1666,9 @@ EndEnum EndSysreg =20 Sysreg ID_AA64DFR0_EL1 3 0 0 5 0 -Enum 63:60 HPMN0 - 0b0000 UNPREDICTABLE - 0b0001 DEF +UnsignedEnum 63:60 HPMN0 + 0b0000 NI + 0b0001 IMP EndEnum UnsignedEnum 59:56 ExtTrcBuff 0b0000 NI --=20 2.53.0.rc2.204.g2597b5adb4-goog