From nobody Thu Dec 18 19:49:33 2025 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 73E76C7EE24 for ; Fri, 2 Jun 2023 10:31:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234582AbjFBKbp (ORCPT ); Fri, 2 Jun 2023 06:31:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236371AbjFBKa5 (ORCPT ); Fri, 2 Jun 2023 06:30:57 -0400 Received: from esa12.hc1455-7.c3s2.iphmx.com (esa12.hc1455-7.c3s2.iphmx.com [139.138.37.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 393C110E6 for ; Fri, 2 Jun 2023 03:29:17 -0700 (PDT) X-IronPort-AV: E=McAfee;i="6600,9927,10728"; a="98690281" X-IronPort-AV: E=Sophos;i="6.00,212,1681138800"; d="scan'208";a="98690281" Received: from unknown (HELO oym-r2.gw.nic.fujitsu.com) ([210.162.30.90]) by esa12.hc1455-7.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jun 2023 19:27:10 +0900 Received: from oym-m3.gw.nic.fujitsu.com (oym-nat-oym-m3.gw.nic.fujitsu.com [192.168.87.60]) by oym-r2.gw.nic.fujitsu.com (Postfix) with ESMTP id CE75FD4256 for ; Fri, 2 Jun 2023 19:27:08 +0900 (JST) Received: from kws-ab4.gw.nic.fujitsu.com (kws-ab4.gw.nic.fujitsu.com [192.51.206.22]) by oym-m3.gw.nic.fujitsu.com (Postfix) with ESMTP id 0949DD9A88 for ; Fri, 2 Jun 2023 19:27:08 +0900 (JST) Received: from localhost.localdomain (unknown [10.167.234.230]) by kws-ab4.gw.nic.fujitsu.com (Postfix) with ESMTP id 0034040FE2; Fri, 2 Jun 2023 19:27:06 +0900 (JST) From: Li Zhijian To: kexec@lists.infradead.org, nvdimm@lists.linux.dev Cc: linux-kernel@vger.kernel.org, dan.j.williams@intel.com, bhe@redhat.com, ruansy.fnst@fujitsu.com, y-goto@fujitsu.com, yangx.jy@fujitsu.com, Li Zhijian , Vivek Goyal , Dave Young Subject: [RFC PATCH makedumpfile v3 1/3] elf_info.c: Introduce is_pmem_pt_load_range Date: Fri, 2 Jun 2023 18:26:54 +0800 Message-Id: <20230602102656.131654-6-lizhijian@fujitsu.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230602102656.131654-1-lizhijian@fujitsu.com> References: <20230602102656.131654-1-lizhijian@fujitsu.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSS-9.1.0.1417-9.0.0.1002-27666.006 X-TM-AS-User-Approved-Sender: Yes X-TMASE-Version: IMSS-9.1.0.1417-9.0.1002-27666.006 X-TMASE-Result: 10--6.061400-10.000000 X-TMASE-MatchedRID: uYOEf1I6Oo115zj/0di3Q+6bo2/Lq3c20MQw+++ihy86FHRWx2FGsL8F Hrw7frluf146W0iUu2uMQUNNVv3RZFsSYoQIc1cjSHCU59h5KrHjLrHqvAiSy0/cRvj5stP609D 6Rw2zIrP6Ss9HyBHBXv2MF5HVqqgBYwDOL7t3RyGeAiCmPx4NwBnUJ0Ek6yhjxEHRux+uk8h+IC quNi0WJEs4O5JlDkki+KxOPxgcX3fuuoHGzHNMZnPOHbXzO9lIftwZ3X11IV0= X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" It checks BIT(4) of Elf64_Phdr, currently only the former 3 bits are used by ELF. In kexec-tool, we extend the BIT(4) to indicate pmem or not. dump_Elf_load: phys_start phys_end virt_start = virt_end is_pmem dump_Elf_load: LOAD[ 0] 6b800000 6e42c000 ffffffffbcc00000 = ffffffffbf82c000 false dump_Elf_load: LOAD[ 1] 1000 9fc00 ffff975980001000 = ffff97598009fc00 false dump_Elf_load: LOAD[ 2] 100000 7f000000 ffff975980100000 = ffff9759ff000000 false dump_Elf_load: LOAD[ 3] bf000000 bffd7000 ffff975a3f000000 = ffff975a3ffd7000 false dump_Elf_load: LOAD[ 4] 100000000 140000000 ffff975a80000000 = ffff975ac0000000 false dump_Elf_load: LOAD[ 5] 140000000 23e200000 ffff975ac0000000 = ffff975bbe200000 true CC: Baoquan He CC: Vivek Goyal CC: Dave Young CC: kexec@lists.infradead.org Signed-off-by: Li Zhijian --- elf_info.c | 31 +++++++++++++++++++++++++++---- elf_info.h | 1 + 2 files changed, 28 insertions(+), 4 deletions(-) diff --git a/elf_info.c b/elf_info.c index bc24083655d6..41b36b2804d2 100644 --- a/elf_info.c +++ b/elf_info.c @@ -43,6 +43,7 @@ struct pt_load_segment { unsigned long long phys_end; unsigned long long virt_start; unsigned long long virt_end; + int is_pmem; }; =20 static int nr_cpus; /* number of cpu */ @@ -153,6 +154,8 @@ check_elf_format(int fd, char *filename, int *phnum, un= signed int *num_load) return FALSE; } =20 +#define PF_DEV (1 << 4) + static int dump_Elf_load(Elf64_Phdr *prog, int num_load) { @@ -170,17 +173,37 @@ dump_Elf_load(Elf64_Phdr *prog, int num_load) pls->virt_end =3D pls->virt_start + prog->p_memsz; pls->file_offset =3D prog->p_offset; pls->file_size =3D prog->p_filesz; + pls->is_pmem =3D !!(prog->p_flags & PF_DEV); =20 if (num_load =3D=3D 0) - DEBUG_MSG("%8s %16s %16s %16s %16s\n", "", - "phys_start", "phys_end", "virt_start", "virt_end"); + DEBUG_MSG("%8s %16s %16s %16s %16s %8s\n", "", + "phys_start", "phys_end", "virt_start", "virt_end", + "is_pmem"); =20 - DEBUG_MSG("LOAD[%2d] %16llx %16llx %16llx %16llx\n", num_load, - pls->phys_start, pls->phys_end, pls->virt_start, pls->virt_end); + DEBUG_MSG("LOAD[%2d] %16llx %16llx %16llx %16llx %8s\n", num_load, + pls->phys_start, pls->phys_end, pls->virt_start, pls->virt_end, + pls->is_pmem ? "true": "false"); =20 return TRUE; } =20 +int is_pmem_pt_load_range(unsigned long long start, unsigned long long end) +{ + int i; + struct pt_load_segment *pls; + + for (i =3D 0; i < num_pt_loads; i++) { + pls =3D &pt_loads[i]; + if (pls->is_pmem && pls->phys_start =3D=3D NOT_PADDR) + return TRUE; + if (pls->is_pmem && pls->phys_start !=3D NOT_PADDR && + pls->phys_start <=3D start && pls->phys_end >=3D end) + return TRUE; + } + + return FALSE; +} + static off_t offset_next_note(void *note) { diff --git a/elf_info.h b/elf_info.h index d5416b32cdd7..a08d59a331f6 100644 --- a/elf_info.h +++ b/elf_info.h @@ -64,6 +64,7 @@ int get_pt_load_extents(int idx, off_t *file_offset, off_t *file_size); unsigned int get_num_pt_loads(void); +int is_pmem_pt_load_range(unsigned long long start, unsigned long long end= ); =20 void set_nr_cpus(int num); int get_nr_cpus(void); --=20 2.29.2