From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C13CBC021B3 for ; Mon, 24 Feb 2025 07:44:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: Message-ID:Date:References:In-Reply-To:Subject:Cc:To:From:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=M+ItPRFFyzJNnAUMLpEPWdXEOVhjKvBADwZX/A53ObA=; b=KNgLFK1jX+PbOoRpStut4oDoM+ oObQnAIwGX9diEunWR4Zg9Fmd0LKuHczKcqOt9prTBh4gVDLx8d69riFw9M51QW9T4gG9YzAF7Vf7 uWUkOXsvvq8KbIVuW4jO01iiRoI9dUA1ZE4Od6Nwo012+LD3f0r+5A5v9mAeW3yil9WMHOnjsAmo8 2qllZUiLwKbF7+pnL7pbjgj8Lkc9/HW/t1+DAS/0uY17JbF6jhIYIJjQSRi5GMYqkjKD4P4RdISx9 +k+PZda3jhTJ+VQASbnrZ69QckM9KsBNv8XzMn6MGJ+Gn2+6rlhHe3RiO80lQmIzZObdZkWxAexka q/1sJ2Uw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tmT8L-0000000Cai0-14gK; Mon, 24 Feb 2025 07:44:09 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tmT5l-0000000CaNc-2zYG for linux-arm-kernel@lists.infradead.org; Mon, 24 Feb 2025 07:41:29 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 5437761178; Mon, 24 Feb 2025 07:41:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7EE82C4CED6; Mon, 24 Feb 2025 07:41:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740382888; bh=z0db1DqZHwFj5ZNDEVx51VsoNu+zSAQurtKCoSQL2aM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=bC9f76XynJZMxxSRIRacLKFFjzO6G7gkKSz+9tKa4ks7eByxWJIV+DSvxVsmdyNd9 g7SpQg6+8/fwhq8MiE1g/Q0/5o8LlGJSfrWZSRjQmecErteiAuVJaN58MktOOKJvgK UVihfCL3nZsUrW59ZrWf7PmH8gyuaP8hxeFiL91yd44C81QjZzGPLqauwZeUEtED47 n3cOsK9j1z5d43+iL0yEgXzliqmdnw3BuXhcEEQQrYFkca801SOkwzxx8ycMBIBHKQ qC3RyHhH6t6VymLzE6YKtXglF3sLfTLsknzm1aSBnSxISnjgRB3oyAtla2CdrMX2IM cb7XG/Ipp4GbA== X-Mailer: emacs 30.1 (via feedmail 11-beta-1 I) From: Aneesh Kumar K.V To: Marc Zyngier , kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Eric Auger Subject: Re: [PATCH 01/14] arm64: cpufeature: Handle NV_frac as a synonym of NV2 In-Reply-To: <20250215173816.3767330-2-maz@kernel.org> References: <20250215173816.3767330-1-maz@kernel.org> <20250215173816.3767330-2-maz@kernel.org> Date: Mon, 24 Feb 2025 13:11:18 +0530 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Marc Zyngier writes: > With ARMv9.5, an implementation supporting Nested Virtualization > is allowed to only support NV2, and to avoid supporting the old > (and useless) ARMv8.3 variant. > > This is indicated by ID_AA64MMFR2_EL1.NV being 0 (as if NV wasn't > implemented) and ID_AA64MMDR4_EL1.NV_frac being 1 (indicating that ^ F The register name is wrong there. > NV2 is actually supported). > -aneesh