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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,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 EB425C4360F for ; Thu, 4 Apr 2019 03:10:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB65420855 for ; Thu, 4 Apr 2019 03:10:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726561AbfDDDKh (ORCPT ); Wed, 3 Apr 2019 23:10:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60982 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726167AbfDDDKh (ORCPT ); Wed, 3 Apr 2019 23:10:37 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D3AC68763B; Thu, 4 Apr 2019 03:10:36 +0000 (UTC) Received: from localhost (ovpn-12-46.pek2.redhat.com [10.72.12.46]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0C31584BD1; Thu, 4 Apr 2019 03:10:33 +0000 (UTC) Date: Thu, 4 Apr 2019 11:10:30 +0800 From: "bhe@redhat.com" To: Dave Young Cc: Junichi Nomura , Chao Fan , Borislav Petkov , "kasong@redhat.com" , "x86@kernel.org" , "kexec@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v2] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel Message-ID: <20190404031030.GU7627@MiWiFi-R3L-srv> References: <20190402120319.GA7605@dhcp-128-65.nay.redhat.com> <20190403053459.GD1555@localhost.localdomain> <20190403055340.GA11976@dhcp-128-65.nay.redhat.com> <20190403072141.GE1555@localhost.localdomain> <20190403080846.GB2579@dhcp-128-65.nay.redhat.com> <20190403082305.GG1555@localhost.localdomain> <20190403090210.GH1555@localhost.localdomain> <20190404025234.GA12658@dhcp-128-65.nay.redhat.com> <20190404030037.GT7627@MiWiFi-R3L-srv> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190404030037.GT7627@MiWiFi-R3L-srv> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 04 Apr 2019 03:10:36 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/04/19 at 11:00am, Baoquan He wrote: > On 04/04/19 at 10:52am, Dave Young wrote: > > On 04/04/19 at 01:23am, Junichi Nomura wrote: > > > Hi Dave and Chao, > > > > > > On 4/3/19 6:02 PM, Chao Fan wrote: > > > > On Wed, Apr 03, 2019 at 04:23:06PM +0800, Chao Fan wrote: > > > >> On Wed, Apr 03, 2019 at 04:09:16PM +0800, Dave Young wrote: > > > >>> Fix 3. need more debugging, have you or Junichi run tests on more real > > > >>> hardware, maybe it is easier to reproduce on real hardware, I'm glad to > > > >>> help to try test patch or provide any help. > > > >> > > > >> I am still testing in real hardware. > > > > > > > > Hi Dave, > > > > > > > > I find a Fujitsu Desktop PC to test it. > > > > Without this PATCH, it failed to kexec and kdump. > > > > With this PATCH, it succeed to kexec. > > > > But failed to kdump. From the log, I think it didn't jump to the second > > > > kernel, just reboot after panic. I have not figured out what's the > > > > problem, but it seems not caused by this PATCH. > > > > So I still think this PATCH works for the Fujitsu Desktop PC. > > > > > > > > As for your issue, I think there may be some problems related to specified > > > > hardware. Are you using a Lenovo laptop? > > > > > > > > And I am not sure how Nomura tested it. > > > > > > I've tested 3 different models of EFI-booted baremetal servers with both > > > normal kexec and panic kexec. So far as I've tried Linus's v5.1-rc3, > > > the problem always reproduced without the patch and disappears with the patch. > > > > Hmm, both of my two laptops (Thinkpad T480s and T420) failed to boot with kexec. > > > > I will see if I can find something, but it may need more time because > > early console does not work especially after kexec. > > Dave, can you try below patch to print debugging message and hang kernel > to check the outputting? The hang is necessary, otherwise later printk > printking will overwrite it. > > diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c > index c0d6c560df69..68119547c4aa 100644 > --- a/arch/x86/boot/compressed/misc.c > +++ b/arch/x86/boot/compressed/misc.c > @@ -351,9 +351,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, > /* Clear flags intended for solely in-kernel use. */ > boot_params->hdr.loadflags &= ~KASLR_FLAG; > > - /* Save RSDP address for later use. */ > - boot_params->acpi_rsdp_addr = get_rsdp_addr(); > - > sanitize_boot_params(boot_params); > > if (boot_params->screen_info.orig_video_mode == 7) { > @@ -370,6 +367,10 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, > console_init(); > debug_putstr("early console in extract_kernel\n"); > + /* Save RSDP address for later use. */ + boot_params->acpi_rsdp_addr = get_rsdp_addr(); + + error("Hang kernel for kexec debugging"); Sorry, here I means calling error() to hang kernel after calling get_rsdp_addr(). > free_mem_ptr = heap; /* Heap */ > free_mem_end_ptr = heap + BOOT_HEAP_SIZE; >