From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from rcdn-iport-5.cisco.com ([173.37.86.76]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bQKDW-00071p-Fd for kexec@lists.infradead.org; Thu, 21 Jul 2016 20:05:11 +0000 Subject: Re: IO memory read from /proc/vmcore leads to hang. References: <57841399.1030703@cisco.com> <578FCE9A.50305@cisco.com> <5790E80F.7080109@cisco.com> From: Daniel Walker Message-ID: <57912ADF.8070803@cisco.com> Date: Thu, 21 Jul 2016 13:04:47 -0700 MIME-Version: 1.0 In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Maxim Uvarov Cc: "xe-kernel@external.cisco.com" , "kexec@lists.infradead.org" On 07/21/2016 12:33 PM, Maxim Uvarov wrote: > 2016-07-21 18:19 GMT+03:00 Daniel Walker : >> There appears to be no code which checks what is or is not System ram, >> there is nothing that checks the device tree to see what is IO memory, and >> nothing reads /proc/iomem .. So AFAIK nothing cares if it's IO memory, or >> system ram, and there's no method to config things to skip any memory in the >> system, except in makedumpfile which can skip symbols not IO memory. >> >> > Daniel, unfortunately it's long time for me when I looked to powerpc > code. But I just > checked that here: > > kexec-tools-2.0.6/kexec/arch/ppc64/kexec-ppc64.c > > is probably what you need. I have a powerpc32 .. In the powerpc64 file I only see something called "reserved-ranges" which may do what I want, however, that doesn't exist in the 32bit version. It appers the reserved-ranges is used by OPAL firmware , which I don't have. There doesn't appear to be anything generic in ppc64 to exclude device IO memory. Daniel _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec