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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT 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 442BCC28CC5 for ; Sat, 8 Jun 2019 09:10:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 193DE2146E for ; Sat, 8 Jun 2019 09:10:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="URdomBe1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726635AbfFHJKd (ORCPT ); Sat, 8 Jun 2019 05:10:33 -0400 Received: from mail.skyhub.de ([5.9.137.197]:47078 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726478AbfFHJKc (ORCPT ); Sat, 8 Jun 2019 05:10:32 -0400 Received: from zn.tnic (p200300EC2F288A00DCF654BEDE068B01.dip0.t-ipconnect.de [IPv6:2003:ec:2f28:8a00:dcf6:54be:de06:8b01]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 8D7BF1EC0235; Sat, 8 Jun 2019 11:10:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1559985031; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=agc6qWSU+tH8yyKDxQhV32Xjr+GidM+gMCD2W3Xjjy8=; b=URdomBe1ERBxGlufupOX27J5DZgEIDbAr5wx8/GGH5LLLEeYN0IUm/2o+y/aoQahA3dTGu LL1uAfkVOn2reWaQBnK5dSv7jmz4oo6GkwDbWygu4IFFJCbydP7VCN6LXFLkSJT9caO7yh lJgNkzoukgNEvmehXJRPQsCqHxaAGw0= Date: Sat, 8 Jun 2019 11:10:30 +0200 From: Borislav Petkov To: Baoquan He Cc: lijiang , linux-kernel@vger.kernel.org, kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, x86@kernel.org, hpa@zytor.com, dyoung@redhat.com, Thomas.Lendacky@amd.com Subject: Re: [PATCH 0/3 v11] add reserved e820 ranges to the kdump kernel e820 table Message-ID: <20190608091030.GB32464@zn.tnic> References: <20190423013007.17838-1-lijiang@redhat.com> <12847a03-3226-0b29-97b5-04d404410147@redhat.com> <20190607174211.GN20269@zn.tnic> <20190608035451.GB26148@MiWiFi-R3L-srv> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190608035451.GB26148@MiWiFi-R3L-srv> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jun 08, 2019 at 11:54:51AM +0800, Baoquan He wrote: > Is it a UEFI box? Yes. > If it's uefi machine, it should relate to below issue. Because kexec > always fails to randomly choose a new position for kernel. The kernel succeeds in selecting a position for the kernel - the kexec kernel doesn't load when a panic happens. Rather, the box panics and nothing more. > The current kexec code fills boot_params->efi_info->efi_loader_signature, > but doesn't contruct efi_memmap table. The kexec/kdump kernel will always > fail to find available slot for KASLR in process_efi_entries. Kernel has # CONFIG_RANDOMIZE_BASE is not set so no KASLR. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.