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=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 EAE10C433E0 for ; Mon, 27 Jul 2020 17:12:41 +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 BD5EE2073E for ; Mon, 27 Jul 2020 17:12:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="nnD8EbrB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="RGlKfXBU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD5EE2073E 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=XmAIZuf/uWfg8QSXNMmH65kGfj2ZI7j60LiqwVpCuqY=; b=nnD8EbrBSaBw++XUxLP6WUUl/ y8XRBun3Fuo3j57AJKlPPTWwWFiJCBnxz+80pbejjbegXdM8Y4DZb89k/yrc0labbXHJg+Gklt/Gj PLiYGBwzfAbdpn5UIacbXsuoKD3z61ZG41fg+EvmJ02pseX9bAlB8z1hBg9KXv4snLJ0Q+iDZfyOf w+0CQAsPbuHa6B79RinyhFHdqN9vlGLjoVt/D7NGi9/fkdEQJAWUSOpZq1hLBLK6Y1P9OSfbAblfr 3SoomT6bjpSVtTsPSS86/6wV1JLuO4TckvaY8Yi0UmfS/rY29mMuTkjsB5bvmPuNAe++USbzfKnlU tz4mEbzww==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k06en-0005AK-OO; Mon, 27 Jul 2020 17:11:21 +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 1k06ek-00058F-G1; Mon, 27 Jul 2020 17:11:19 +0000 Received: from kernel.org (unknown [87.71.40.38]) (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 3AAEB206E7; Mon, 27 Jul 2020 17:11:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595869877; bh=XLRy4SH6xYtcSpdHOrlqOGtGsA5ScggILcg7hMblP4k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RGlKfXBUd26L5XDA1ssqNMsN524ad4SB5OWposrAfAR1GqXXVCoku8j2/PxKiDDlt ZjgCXf8wWE4+IGmxJrktVr72zad9jL8jTfqjGu+VoAyYWbVCO1WDhniWv6reqEeMu8 mqapPlh3w6TjsmKchi6eYJoHQoysiCGjddWIxmbQ= Date: Mon, 27 Jul 2020 20:11:02 +0300 From: Mike Rapoport To: linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 7/7] mm: secretmem: add ability to reserve memory at boot Message-ID: <20200727171102.GA3655207@kernel.org> References: <20200727162935.31714-1-rppt@kernel.org> <20200727162935.31714-8-rppt@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200727162935.31714-8-rppt@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200727_131118_671780_7FC5DD97 X-CRM114-Status: GOOD ( 25.45 ) 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: Peter Zijlstra , Catalin Marinas , Dave Hansen , linux-mm@kvack.org, "H. Peter Anvin" , Christopher Lameter , Idan Yaniv , Dan Williams , Elena Reshetova , linux-arch@vger.kernel.org, Tycho Andersen , linux-nvdimm@lists.01.org, Will Deacon , x86@kernel.org, Matthew Wilcox , Mike Rapoport , Ingo Molnar , Michael Kerrisk , Arnd Bergmann , James Bottomley , Borislav Petkov , Alexander Viro , Andy Lutomirski , Paul Walmsley , "Kirill A. Shutemov" , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org, linux-riscv@lists.infradead.org, Palmer Dabbelt , linux-fsdevel@vger.kernel.org, Andrew Morton 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 Oops, something went wrong with the rebase, this should have been squashed into the previous patch... On Mon, Jul 27, 2020 at 07:29:35PM +0300, Mike Rapoport wrote: > From: Mike Rapoport > > Taking pages out from the direct map and bringing them back may create > undesired fragmentation and usage of the smaller pages in the direct > mapping of the physical memory. > > This can be avoided if a significantly large area of the physical memory > would be reserved for secretmem purposes at boot time. > > Add ability to reserve physical memory for secretmem at boot time using > "secretmem" kernel parameter and then use that reserved memory as a global > pool for secret memory needs. > > Signed-off-by: Mike Rapoport > --- > Documentation/admin-guide/kernel-parameters.txt | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index fb95fad81c79..6f3c2f28160f 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -4548,6 +4548,10 @@ > Format: integer between 0 and 10 > Default is 0. > > + secretmem=n[KMG] > + [KNL,BOOT] Reserve specified amount of memory to > + back mappings of secret memory. > + > skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate > xtime_lock contention on larger systems, and/or RCU lock > contention on all systems with CONFIG_MAXSMP set. > -- > 2.26.2 > -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel