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=-5.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 CEA9EC5DF60 for ; Tue, 5 Nov 2019 17:30:14 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 7C4F6214B2 for ; Tue, 5 Nov 2019 17:30:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="heRHCwgV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7C4F6214B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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=bombadil.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=UeUIhpyWoaelJFjekw1L5FPjmRP0CSPrmdYbu+N7eDY=; b=heRHCwgVBmPHf8 IF0Sxbh6rGynqCQx/CAvelZ7npQjap1zChMj+fMu/ohz3Zp/GTlJaLzVmxgz/4BAXeY0uqTRyZvLf 15JzRN+fP5a7sEjCdLTPskau17q0stMJlsNuk7Cv5IxzHeoE22FLRmtZJK/j3CUX11YPM4PyCQLxW jR3ZnabbIqBTt1HQ5WjW1TvG5fBxXOwZTel0+gh3iEx9dctYwJizi+cu7jZh0SZLCoSL6OiCT8X9Z kjasD0QFbw7X43qZtJlKasYV9cVNesFjqT89ganwXsC+IAoDXp8NILptovgliehQ7hckokx8X/XIo WbRvydzUw93p02j0ERJA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iS2ej-0002iR-Jw; Tue, 05 Nov 2019 17:30:13 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iS2eg-0002LZ-5i for linux-arm-kernel@lists.infradead.org; Tue, 05 Nov 2019 17:30:11 +0000 Received: from arrakis.emea.arm.com (unknown [46.69.195.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 11099214D8; Tue, 5 Nov 2019 17:30:08 +0000 (UTC) Date: Tue, 5 Nov 2019 17:30:06 +0000 From: Catalin Marinas To: Mark Brown Subject: Re: [PATCH v5 4/4] arm64: Use a variable to store non-global mappings decision Message-ID: <20191105173005.GE22987@arrakis.emea.arm.com> References: <20191104191524.10596-1-broonie@kernel.org> <20191104191524.10596-5-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191104191524.10596-5-broonie@kernel.org> 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-20191105_093010_286757_D3C2C3A7 X-CRM114-Status: GOOD ( 11.46 ) 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: Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Nov 04, 2019 at 07:15:24PM +0000, Mark Brown wrote: > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > index 45c00a54909c..a09a02b5979a 100644 > --- a/arch/arm64/mm/init.c > +++ b/arch/arm64/mm/init.c > @@ -456,6 +456,13 @@ void __init bootmem_init(void) > zone_sizes_init(min, max); > > memblock_dump_all(); > + > + /* > + * If know now we are going to need KPTI then use non-global > + * mappings from the start, avoiding the cost of rewriting > + * everything later. > + */ > + arm64_use_ng_mappings = kaslr_requires_kpti(); > } I think we need this even earlier in paging_init() before we start creating the kernel mappings. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel