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 1C6993BAD92; Thu, 30 Jul 2026 07:11:05 +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=1785395472; cv=none; b=iYWo/JNQtDvv4Z9q3I4Q0JdIsYaHxGIgnzSQ+5ZM5fA1+yDgoWKxp6gebyFpPJXgXUyMG9t9qFO1VIjKBQNHaiqt0EUeWowAbNN+LFlLd87wdbl3/+8mTzh5YAHpPZWz6oqtkKoxw43zODVvdGoYsYek28FIXX5dmaazPdi5Rk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785395472; c=relaxed/simple; bh=hXi+wHea7bpw5uwNfDtJwlx96Qo3FBx4PXLeYtECkNY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AVvXcpIeEs8/TO2TcSQa9WWlgo/V4Bu8JK0Ga3wjBTyqFcGqyD6hV419Qr1T580ppPgDVAjQDH1Um8eEXN9y9Gj3bhICLA7BgJNedI7mdrJOI1FEbkyssu1skANFkCtKkXkVV0EiwqizSNZc62MCIhUDf4s0I6JyaQNFA+stLAs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h7LTurJq; 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="h7LTurJq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0F9E1F01569; Thu, 30 Jul 2026 07:10:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785395455; bh=FGvQNkP1l3TwbdM+M5kTh96uuQDjEKCciwByUmopZFA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=h7LTurJqv9b0ZPY7NJOaeijHK1lGlK0IAH3hfFk2Io964T313o5F52qcFMUKmdNIH CPpAY5uSOkpjFmV/v5prCdvR5h1rf8xUcwMbEXdRMgoNY3WrJv+yjZmS4V8kkCSeEy /XDh4OBNSj8ap4N4HlTgxkjxorQiy8Lz2ZZIrybHfrWFwT7MLcLF8bQh8jwIyLKL4E 3a3YHrGMbbckL/ZtkCbZdvk+sDKgVb324aIfc758Qul5kj22+WPiCBxekMnL7tTwxx l4Xky7EgK73lhD0UjaWdo4vYLVMqg8kioid51tzvSnFx6WTyLSDA3AhEFKXYxlAWgP 4Nd3d6CsvVh/A== 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 1wpKus-0000000AOpW-12ip; Thu, 30 Jul 2026 07:10:54 +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 27/29] KVM: arm64: Expose FEAT_NV3 to guests Date: Thu, 30 Jul 2026 08:10:20 +0100 Message-ID: <20260730071022.296811-28-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: kvmarm@lists.linux.dev 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 Further enable FEAT_NV3 by making it visible to NV guests. Reviewed-by: Yuan Yao Signed-off-by: Marc Zyngier --- arch/arm64/kvm/nested.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index f646894fec9a9..70d605e60cfb3 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(p1) + * - FEAT_NV limited to FEAT_NV2(p1)/NV3 * - HCR_EL2.NV1 being RES0 * * OR @@ -1741,7 +1741,9 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) val = 0; } else { val &= ID_AA64MMFR4_EL1_NV_frac; - if (cpus_have_final_cap(ARM64_HAS_NV2P1)) + if (cpus_have_final_cap(ARM64_HAS_NV3)) + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV3); + else 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); -- 2.47.3