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 61F3AC021B6 for ; Mon, 24 Feb 2025 09:57:09 +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=UeI+Szk8Ev23V8Kfs42+SvMV0rpgNmn98EN/eJAG0V0=; b=wFNqVZASA8HodA17EUZc0QGzte SFQ5Q84jMagihsHZUkCq5KzcBZ6sYYtjKDMpcuGDCcsiFE6eOwWgqjT6AgQduSf+pMfV6tpJYvB9a cLVah92qPu1nc+AwtEvDJFcE7Sf3UxTaZQQJy3KZpGeEPydkBl0Dh+YzrcXjSYNil6kVZ2pMltB46 kOW1/Q38XPTzdoetW3sY+q2jc/AuDjx2vH7wJat1GPEkdD6484LOzscKGePjJryBBkVPvKXSHYEHp wW5T+lquEY4BFYba12R4yrQbfiCXy1pJ66RQjv2Jz0G0NSQfc1Q3Iq5Fwu5T8gyH6Y+rMQPuuxnzg m75LFf/w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tmVCv-0000000D0aT-0C9a; Mon, 24 Feb 2025 09:57:01 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tmV1A-0000000CyDQ-1p3v for linux-arm-kernel@lists.infradead.org; Mon, 24 Feb 2025 09:44:53 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E71F35C568E; Mon, 24 Feb 2025 09:44:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70987C4CED6; Mon, 24 Feb 2025 09:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740390291; bh=Oy30/9mZEn7bUDinnc0MnPc95uAajJprYdB66FJ2hCs=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=ZzRW7iYPehAt4rl2l5x8kO9GrbI3DA+cEo6LuHgroln05qBr+x3k7Iu+UBZtGq6CJ NZjxXQYOU1LX19IF0G7wVIBzhlGfaJggIV2co5mGNCNC4TYP13qC0dpsq3d72P0sAt ziVbsWv3TTPCoAVh1dNAet91w8X01FmFm3Hu32FXF7BznloWziRPwM6MCg6iEaybaM s5KVkJ/joeYbskA8UNWDmcxzv3j+PDdsNmXqS8QlVieRqFb2X6PlSjArl5HEiM5xtd Vka1QE1vNd1iIusYL8J1TWHGVReDLPEnl8CRuIUJsG7Jt3Ezt0BwkAMtPLiVdgiIC+ hOGNJku6qPvBg== 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 , gankulkarni@os.amperecomputing.com Subject: Re: [PATCH v2 10/14] KVM: arm64: Allow userspace to limit NV support to nVHE In-Reply-To: <20250220134907.554085-11-maz@kernel.org> References: <20250220134907.554085-1-maz@kernel.org> <20250220134907.554085-11-maz@kernel.org> Date: Mon, 24 Feb 2025 15:14:44 +0530 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250224_014452_514364_46F3AD1D X-CRM114-Status: UNSURE ( 5.41 ) X-CRM114-Notice: Please train this message. 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: > NV is hard. No kidding. > > In order to make things simpler, we have established that NV would > support two mutually exclusive configurations: > > - VHE-only, and supporting recursive virtualisation > > - mVHE-only, and not supporting recursive virtualisation > mVHE-only -> nVHE-only -aneesh