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 B2DDB47143C; Wed, 22 Jul 2026 07:42:58 +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=1784706180; cv=none; b=pae4w2rQ6+FCjNtcAf03ur9yhV4aF8q98U2jSRryebKUH0lLtogJ0sfDl3WGnpJna40yfvwL4KJ9LiFXXZzlc8ekfyolRzW9eGKqsmJrn0lhVbd/ylAS/56MlSwPGAn4wq9Ov4zYF8E5WcisLZ7rlNUPwO6/Wm+XUYZYQ31olcg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784706180; c=relaxed/simple; bh=9NbUIFOuQGhPmdmTQ518VoxJ7RJNQ2KTV36YNQscAVY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Uoz20NtCjzIOROabRKtwixUNcQ31pSEGWKMzF6yZfaS9B62y2ujPnPAuZccYsdpRxZj8w7GwcO1JQ4q70TvYmBzc3VfAOfwCpZ5pQKSFolaSoVSo+pXE6iPK/MR59aqgHMMGfbHByjcuqcZa4ible22LlGyH9hxRYtU3wFteNkI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PAmcTda1; 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="PAmcTda1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6068E1F000E9; Wed, 22 Jul 2026 07:42:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784706178; bh=07dRYKXgRyU3x0X5on17tlJ7LESqf7TzRfpEcaCKSac=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PAmcTda1WQ9W/sc+o91nL9LtHai/Dh4NdHfL4JRHGAXw5ZXq0eJtFXcjPRJUSPB3w TztnxH7GzFJtyC+XRw3XAUCrpf/NRLaAYHnHN1jXFAjYuEHKp0vZ0C+5ejmiw55di2 OQY+t/E9hW+u5ARKb4wZsbzuOoFRPdA8e4OGfQaYEYyOvbkQWViI6M/vC+OGieXTMJ 2LAGhBvdDi5tmVlLLbbBxaiZ97A2IBBruX675/NO4T1TP3NcFgPl79Xyvdjt53Co6c Y0rXEeNZLJWR4WU9ishl8/7IWpnTYfw/yZVOXwjOr2AiJoIGdg/GwNuK6l1W9i94eI 3uHGsjvxgXCwA== 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 1wmRbU-00000007VfN-2pd7; Wed, 22 Jul 2026 07:42:56 +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 Subject: [PATCH v3 11/28] KVM: arm64: Expose FEAT_NV2p1 to NV guests Date: Wed, 22 Jul 2026 08:42:17 +0100 Message-ID: <20260722074234.3330999-12-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260722074234.3330999-1-maz@kernel.org> References: <20260722074234.3330999-1-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 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. 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