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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 683A8E732D9 for ; Thu, 28 Sep 2023 13:33:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232160AbjI1Ndd (ORCPT ); Thu, 28 Sep 2023 09:33:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232050AbjI1Ndb (ORCPT ); Thu, 28 Sep 2023 09:33:31 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE63C1A1 for ; Thu, 28 Sep 2023 06:33:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695908009; x=1727444009; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=TV50ur6EsvFD+NIQva87XnbSKRPe7K1V/2028Lb4zYE=; b=Zw71CayG4jsFtFQYWvPXN6KAoaQY0T2BIscmmHjwt5kYcf7iDEozUu44 tZhugjPMbofMcR5sc758yXsCHBgPKzqw4J8W4kTCGmBwbVca0Ib/3ERNB tdMMYrEB6K7kCS3PCYrOpVBFSHjlL7Eet61CyEwO1ZxRHeFfTsWDYDGYg O1mLx/fL4B+BFJGeehT16aAevrQGxiE4gCD/Mqo1TUH1Wk3uSMO63anvM DRLnyLTO9wMurkwXLTNc/4ckeNwvJVvysvtkMK0EV6y4HE4qQuY1ePzqG zUTjhkTdIiIXvHZ2H9pnUehZ9zQpNjNUvRECT3TrbrJPdvgZtNHd19Fqx w==; X-IronPort-AV: E=McAfee;i="6600,9927,10846"; a="367123735" X-IronPort-AV: E=Sophos;i="6.03,184,1694761200"; d="scan'208";a="367123735" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2023 06:22:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10846"; a="784686572" X-IronPort-AV: E=Sophos;i="6.03,184,1694761200"; d="scan'208";a="784686572" Received: from jveerasa-mobl.amr.corp.intel.com (HELO [10.255.231.134]) ([10.255.231.134]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2023 06:22:54 -0700 Message-ID: Date: Thu, 28 Sep 2023 06:22:54 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [RFC PATCH v2 0/7] Introduce persistent memory pool Content-Language: en-US To: Stanislav Kinsburskii , Baoquan He Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, ebiederm@xmission.com, akpm@linux-foundation.org, stanislav.kinsburskii@gmail.com, corbet@lwn.net, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org, kys@microsoft.com, jgowans@amazon.com, wei.liu@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, graf@amazon.de, pbonzini@redhat.com References: <01828.123092517290700465@us-mta-156.us.mimecast.lan> <20230927161319.GA19976@skinsburskii.> From: Dave Hansen In-Reply-To: <20230927161319.GA19976@skinsburskii.> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/27/23 09:13, Stanislav Kinsburskii wrote: > Once deposited, these pages can't be accessed by Linux anymore and thus > must be preserved in "used" state across kexec, as hypervisor state is > unware of kexec. If Linux can't access them, they're not RAM any more. I'd much rather remove them from the memory map and move on with life rather than implement a bunch of new ABI that's got to be handed across kernels.