From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 59962385D99; Thu, 30 Jul 2026 07:10:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785395462; cv=none; b=rRGmbMDXPY1yvjJfI4luFtJYLO9ZiHVlPA9JrpWdd4IOGHRvazZRXhHNJaAwVc/d4binrJJvYR9EvLmgvKPh2BcRoTrx7a4WSiwmn3uOW03WYvMGsr68dmFS3MHLO44zkhMLE1m7MH8nsO15z2JWACOQIz60b6/ZF9N1cWb0tmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785395462; c=relaxed/simple; bh=vk2r7//Zvke+PE+V0iLhh0SR465pXJccTMCi4PTNI7Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q7EyjqDN0Hz0Du/3QRuZq1E0iOJCATaxZUncqb4vN8hx8P8BII7G14Bm9bFFFQnoT1JjojaBllL6p5NfrarmK5cPZX+nnZLEX4nZy05d0+yLY3mMpCYUYWWXW5orNW4cwSaifv8D22cWMPzsJzh00v8EoPb9J1bNzc6XSwGiktU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JVdcIrX8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JVdcIrX8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 714611F01558; Thu, 30 Jul 2026 07:10:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785395452; bh=6Wkw5ZKNMjRbwNS1o7cxYnLYMeMkPTyLGWptsJzKzSw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JVdcIrX8Eh9DHVwN4ZrwthhwTorvNfqjACLChcsBSqXXhJ7hKqFRg2KVhVcN22v7n hG3Dxs0ERoSaT5X3lnOWR7c8AK4ylautjUJGGkmTDr39YHh6FyYqv5s7rDnHexgrOU 7D7O3pJV++bvBJdYHwpdd1qJJjvg+hSNttnsqUNwlprnT6VEMCpOhxHmH9neKwWyUb fslduP0k+Do47rVjnSQR0mFPzGI74oIlPzNJec8CKVToE2DQRvTdRDe9JETTFXyhbC RQR+TbXBaMP0IHiNEUqo8lnwdrrh/KEAPNLck62uKvRPJ0ThC7S68RdNqt+xTZ3qbg Hj4GXPwDd2TYA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wpKuo-0000000AOpW-3Ac4; Thu, 30 Jul 2026 07:10:50 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Steffen Eiden , Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Yao Yuan , Wei-Lin Chang , Vladimir Murzin Subject: [PATCH v4 11/29] KVM: arm64: Expose FEAT_NV2p1 to NV guests Date: Thu, 30 Jul 2026 08:10:04 +0100 Message-ID: <20260730071022.296811-12-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260730071022.296811-1-maz@kernel.org> References: <20260730071022.296811-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, seiden@linux.ibm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, yaoyuan@linux.alibaba.com, weilin.chang@arm.com, vladimir.murzin@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Since NV2p1 is reducing the number of traps, it is valuable to expose it to NV guests. Do so. Reviewed-by: Yuan Yao Signed-off-by: Marc Zyngier --- arch/arm64/kvm/nested.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index dfb96edbdc43c..35a1c42ad3f84 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -1728,7 +1728,7 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) * You get EITHER * * - FEAT_VHE without FEAT_E2H0 - * - FEAT_NV limited to FEAT_NV2 + * - FEAT_NV limited to FEAT_NV2(p1) * - HCR_EL2.NV1 being RES0 * * OR @@ -1740,7 +1740,11 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features)) { val = 0; } else { - val = SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY); + val &= ID_AA64MMFR4_EL1_NV_frac; + if (cpus_have_final_cap(ARM64_HAS_NV2P1)) + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV2P1); + else + val = SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY); val |= SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, E2H0, NI_NV1); } break; -- 2.47.3