From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=Ib4m=W7=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 D60CCC3A5A9
	for <linuxppc-dev@archiver.kernel.org>; Wed,  4 Sep 2019 20:28:33 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(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 541B621726
	for <linuxppc-dev@archiver.kernel.org>; Wed,  4 Sep 2019 20:28:33 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 541B621726
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 46NwPp6ZFQzDqxc
	for <linuxppc-dev@archiver.kernel.org>; Thu,  5 Sep 2019 06:28:30 +1000 (AEST)
Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2])
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
 key-exchange X25519 server-signature RSA-PSS (2048 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 46NwDb3DTjzDqtW
 for <linuxppc-dev@lists.ozlabs.org>; Thu,  5 Sep 2019 06:20:31 +1000 (AEST)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=linux.ibm.com
Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1])
 by bilbo.ozlabs.org (Postfix) with ESMTP id 46NwDb0DW8z8xHg
 for <linuxppc-dev@lists.ozlabs.org>; Thu,  5 Sep 2019 06:20:31 +1000 (AEST)
Received: by ozlabs.org (Postfix)
 id 46NwDZ6SMHz9sDB; Thu,  5 Sep 2019 06:20:30 +1000 (AEST)
Authentication-Results: ozlabs.org;
 spf=pass (mailfrom) smtp.mailfrom=linux.ibm.com
 (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;
 envelope-from=hbathini@linux.ibm.com; receiver=<UNKNOWN>)
Authentication-Results: ozlabs.org;
 dmarc=none (p=none dis=none) header.from=linux.ibm.com
Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com
 [148.163.158.5])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by ozlabs.org (Postfix) with ESMTPS id 46NwDZ1qq3z9sDQ
 for <linuxppc-dev@ozlabs.org>; Thu,  5 Sep 2019 06:20:29 +1000 (AEST)
Received: from pps.filterd (m0098419.ppops.net [127.0.0.1])
 by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id
 x84KJDNG095260
 for <linuxppc-dev@ozlabs.org>; Wed, 4 Sep 2019 16:20:27 -0400
Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103])
 by mx0b-001b2d01.pphosted.com with ESMTP id 2utjwhjney-1
 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT)
 for <linuxppc-dev@ozlabs.org>; Wed, 04 Sep 2019 16:20:27 -0400
Received: from localhost
 by e06smtp07.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only!
 Violators will be prosecuted
 for <linuxppc-dev@ozlabs.org> from <hbathini@linux.ibm.com>;
 Wed, 4 Sep 2019 21:20:25 +0100
Received: from b06cxnps4075.portsmouth.uk.ibm.com (9.149.109.197)
 by e06smtp07.uk.ibm.com (192.168.101.137) with IBM ESMTP SMTP Gateway:
 Authorized Use Only! Violators will be prosecuted; 
 (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256)
 Wed, 4 Sep 2019 21:20:23 +0100
Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60])
 by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 x84KKLp560621034
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK);
 Wed, 4 Sep 2019 20:20:21 GMT
Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 6A0984203F;
 Wed,  4 Sep 2019 20:20:21 +0000 (GMT)
Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 757F642045;
 Wed,  4 Sep 2019 20:20:19 +0000 (GMT)
Received: from [9.199.38.196] (unknown [9.199.38.196])
 by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP;
 Wed,  4 Sep 2019 20:20:19 +0000 (GMT)
Subject: Re: [PATCH v5 15/31] powernv/fadump: support copying multiple kernel
 boot memory regions
To: Michael Ellerman <mpe@ellerman.id.au>,
 linuxppc-dev <linuxppc-dev@ozlabs.org>
References: <156630261682.8896.3418665808003586786.stgit@hbathini.in.ibm.com>
 <156630275779.8896.7854485220030978790.stgit@hbathini.in.ibm.com>
 <877e6oqoxm.fsf@mpe.ellerman.id.au>
From: Hari Bathini <hbathini@linux.ibm.com>
Date: Thu, 5 Sep 2019 01:50:18 +0530
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
MIME-Version: 1.0
In-Reply-To: <877e6oqoxm.fsf@mpe.ellerman.id.au>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-TM-AS-GCONF: 00
x-cbid: 19090420-0028-0000-0000-00000397BF61
X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused
x-cbparentid: 19090420-0029-0000-0000-0000245A122D
Message-Id: <f390b22d-862b-038e-16fa-bcc4ea50f1f8@linux.ibm.com>
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, ,
 definitions=2019-09-04_05:, , signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 priorityscore=1501
 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0
 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0
 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx
 scancount=1 engine=8.0.1-1906280000 definitions=main-1909040203
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: Ananth N Mavinakayanahalli <ananth@linux.ibm.com>,
 Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
 Vasant Hegde <hegdevasant@linux.ibm.com>, Oliver <oohall@gmail.com>,
 Nicholas Piggin <npiggin@gmail.com>, Daniel Axtens <dja@axtens.net>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>



On 04/09/19 5:00 PM, Michael Ellerman wrote:
> Hari Bathini <hbathini@linux.ibm.com> writes:
>> Firmware uses 32-bit field for region size while copying/backing-up
> 
> Which firmware exactly is imposing that limit?

I think the MDST/MDRT tables in the f/w. Vasant, which component is that?

>> +	/*
>> +	 * Firmware currently supports only 32-bit value for size,
> 
> "currently" implies it could change in future?
> 
> If it does we assume it will only increase, and we're happy that old
> kernels will continue to use the 32-bit limit?

I am not aware of any plans to make it 64-bit. Let me just say f/w supports
only 32-bit to get rid of that ambiguity..

- Hari