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 X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 203ACC433FE for ; Tue, 8 Dec 2020 09:41:50 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7FEEE23A82 for ; Tue, 8 Dec 2020 09:41:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7FEEE23A82 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rUnSFtaW1YFcvlPt3s2mQALt249Uhjfe9ThbiLym2Z4=; b=3WP1aUH6h4jFfClY8qrxrrKWC CQm+E7TplRIBw2ui6iqmxpweSUCEEPX508VNzxIyqQh36e1dfTmbFjixXqMKQJAVhIhf7YldqFgQR 9PFhsBRCE8yL/sGBaFV/BdH9W0QPWF1y2+DxRPToMen13FrhUVvk6IhykN4PVgMWiWOGJJAINmuCX IYi1kOg6Opu266WPH1EGBi1qb94dOaO/LMAOk0R9EaxfB4J2MDsorWpMs8XzkXTnqELigd/jcOnW6 j7HFU8ZmFpnT9vsKYK7eh+k7v+R83gF4f0fAL8J56edjXrVVF7HYGqUI9sUqo9rfzXP0NoMIegaLg sXBMYSxrQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmZU5-0002sL-El; Tue, 08 Dec 2020 09:40:37 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmZU1-0002rs-OQ for linux-arm-kernel@lists.infradead.org; Tue, 08 Dec 2020 09:40:34 +0000 Date: Tue, 8 Dec 2020 09:40:27 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1607420432; bh=l03X9b1AwR7eEYo3VLDO+AWbKPeOsT8lUlLG3XUEGcc=; h=From:To:Cc:Subject:References:In-Reply-To:From; b=B9yFCJVPeCmI8cxF0hHxdebit6cTtoLiw93kazgl0x+BJCfUJJXOZNfRGlYKaygXI S/N+40Uwu0X5uWaRwpuCZ2jc8AlyUfdZpE/NM3RSP3QSz+o8XgD35WRRD2+xDNbXGZ VGH+IiMIgdJj74Kd/2A2KesH+nrjgb9PcdGfaCUAdXvQdli5MpnnWsUwzJHKiwEvDd SmjfzgawHzDoD/40UPolbneGtEDobrxNbSh5oHZO3KfAdI+flFHiVg9esS9VGe/Oxr Rh5SfXP/9IDR+s7jMOFYBEKEwxZ8kOghkhqxHHdsyKIbnhjx4/wuZXbaNwKKQBF7mu GXiLXL8rGbQ2w== From: Will Deacon To: Quentin Perret Subject: Re: [RFC PATCH 16/27] KVM: arm64: Prepare Hyp memory protection Message-ID: <20201208094026.GA5562@willie-the-truck> References: <20201117181607.1761516-1-qperret@google.com> <20201117181607.1761516-17-qperret@google.com> <20201207134052.GA4563@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201208_044034_159693_F8C03D93 X-CRM114-Status: GOOD ( 14.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" , kernel-team@android.com, Suzuki K Poulose , android-kvm@google.com, Catalin Marinas , open list , Rob Herring , James Morse , "moderated list:ARM64 PORT \(AARCH64 ARCHITECTURE\)" , Marc Zyngier , Frank Rowand , "open list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)" , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Dec 07, 2020 at 02:11:20PM +0000, Quentin Perret wrote: > On Monday 07 Dec 2020 at 13:40:52 (+0000), Will Deacon wrote: > > Why not use the RESERVEDMEM_OF_DECLARE() interface for the hypervisor > > memory? That way, the hypervisor memory can either be statically partitioned > > as a carveout or allocated dynamically for us -- we wouldn't need to care. > > Yup, I did consider that, but the actual amount of memory we need to > reserve for the hypervisor depends on things such as the size of struct > hyp_page, which depends on the kernel you're running (that is, it might > change over time). So, that really felt like something the kernel should > be doing, to keep the DT backward compatible, ... Or did you have > something more elaborate in mind? No, that's fair. Just wanted to make sure we had a good reason not to use the existing memory reservation code. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel