From: "H. Peter Anvin" <hpa@zytor.com>
To: vgoyal@in.ibm.com
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@osdl.org>,
linux kernel mailing list <linux-kernel@vger.kernel.org>,
Reloc Kernel List <fastboot@lists.osdl.org>,
ak@suse.de, horms@verge.net.au, lace@jankratochvil.net,
magnus.damm@gmail.com, lwang@redhat.com, dzickus@redhat.com,
maneesh@in.ibm.com
Subject: Re: [PATCH 12/12] i386 boot: Add an ELF header to bzImage
Date: Wed, 04 Oct 2006 13:27:49 -0700 [thread overview]
Message-ID: <45241945.2020105@zytor.com> (raw)
In-Reply-To: <20061004202244.GA3629@in.ibm.com>
Vivek Goyal wrote:
>
> Eric/Peter,
>
> How about just extending bzImage format to include some info in real mode
> kernel header. Say protocol version 2.05. I think if we just include two
> more fields, is kernel relocatable and equivalent of ELF memsz, then probably
> this information should be enough for kexec bzImage loader to load and run
> a relocatable kernel from a different address.
>
What would be the exact semantics of the "equivalent of ELF memsz"? I
have balked on that one in the past, because the proposed semantics were
unsafe.
I suspect we need at least one more piece of data, which is the required
alignment of a relocated kernel. Either which way, it seems clear that
there is some re-engineering that needs to be done, and I think we need
to better understand *why* the proposed patch failed.
Can this failure be reproduced in a simulator?
-hpa
next prev parent reply other threads:[~2006-10-04 20:28 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-03 17:00 [RFC][PATCH 0/12] ELF Relocatable x86 bzImage (V2) Vivek Goyal
2006-10-03 17:04 ` [PATCH 1/12] i386: Distinguish absolute symbols Vivek Goyal
2006-10-07 6:35 ` Andrew Morton
2006-10-08 16:47 ` Vivek Goyal
2006-10-09 7:35 ` Gerd Hoffmann
2006-10-09 13:49 ` Vivek Goyal
2006-10-03 17:06 ` [PATCH 2/12] i386: align data section to 4K boundary Vivek Goyal
2006-10-04 11:17 ` Andi Kleen
2006-10-04 15:18 ` H. Peter Anvin
2006-10-03 17:09 ` [PATCH 3/12] i386: Force section size to be non-zero to prevent a symbol becoming absolute Vivek Goyal
2006-10-04 11:02 ` Andi Kleen
2006-10-04 14:07 ` Eric W. Biederman
2006-10-04 14:45 ` Vivek Goyal
2006-10-04 16:09 ` Andrew Morton
2006-10-04 16:14 ` Vivek Goyal
2006-10-03 17:10 ` [PATCH 4/12] i386: define __pa_symbol() Vivek Goyal
2006-10-04 8:26 ` Franck Bui-Huu
2006-10-04 19:44 ` Vivek Goyal
2006-10-06 13:10 ` Franck Bui-Huu
2006-10-06 18:33 ` Vivek Goyal
2006-10-03 17:12 ` [PATCH 5/12] i386 setup.c: Reserve kernel memory starting from _text Vivek Goyal
2006-10-03 17:15 ` [PATCH 6/12] i386: CONFIG_PHYSICAL_START cleanup Vivek Goyal
2006-10-03 18:45 ` Dave Hansen
2006-10-03 18:52 ` Vivek Goyal
2006-10-03 18:59 ` Eric W. Biederman
2006-10-03 19:35 ` Vivek Goyal
2006-10-03 17:17 ` [PATCH 7/12] Make linux/elf.h safe to be included in assembly files Vivek Goyal
2006-10-03 17:19 ` [PATCH 8/12] elf: Add ELFOSABI_STANDALONE to elf.h Vivek Goyal
2006-10-03 17:21 ` [PATCH 9/12] kallsyms: Generate relocatable symbols Vivek Goyal
2006-10-03 17:22 ` [PATCH 10/12] i386: Relocatable kernel support Vivek Goyal
2006-10-03 17:24 ` [PATCH 11/12] i386: Implement CONFIG_PHYSICAL_ALIGN Vivek Goyal
2006-10-03 17:25 ` [PATCH 12/12] i386 boot: Add an ELF header to bzImage Vivek Goyal
2006-10-04 3:13 ` Andrew Morton
2006-10-04 4:28 ` Vivek Goyal
2006-10-04 4:40 ` H. Peter Anvin
2006-10-04 8:04 ` Eric W. Biederman
2006-10-04 15:18 ` H. Peter Anvin
2006-10-05 4:12 ` Eric W. Biederman
2006-10-05 4:17 ` H. Peter Anvin
2006-10-04 20:22 ` Vivek Goyal
2006-10-04 20:27 ` H. Peter Anvin [this message]
2006-10-04 20:48 ` Vivek Goyal
2006-10-04 20:52 ` H. Peter Anvin
2006-10-04 21:06 ` Vivek Goyal
2006-10-04 21:09 ` H. Peter Anvin
2006-10-04 5:37 ` Andrew Morton
2006-10-05 4:06 ` Eric W. Biederman
2006-10-05 4:12 ` H. Peter Anvin
2006-10-05 4:44 ` Andrew Morton
2006-10-05 6:13 ` Eric W. Biederman
2006-10-05 6:31 ` Andrew Morton
2006-10-05 6:48 ` Eric W. Biederman
2006-10-05 21:54 ` Vivek Goyal
2006-10-05 15:25 ` H. Peter Anvin
2006-10-05 15:35 ` Eric W. Biederman
2006-10-05 15:29 ` Eric W. Biederman
2006-10-05 15:44 ` H. Peter Anvin
2006-10-06 6:59 ` Andrew Morton
2006-10-06 12:56 ` Eric W. Biederman
2006-10-06 18:38 ` Vivek Goyal
2006-10-06 18:54 ` H. Peter Anvin
2006-10-06 19:09 ` Eric W. Biederman
2006-10-06 21:54 ` H. Peter Anvin
2006-10-09 14:33 ` Vivek Goyal
2006-10-10 3:14 ` Andrew Morton
2006-10-10 4:51 ` Eric W. Biederman
2006-10-10 14:30 ` Vivek Goyal
2006-10-10 18:46 ` Andrew Morton
2006-10-10 21:40 ` Vivek Goyal
2006-10-11 2:35 ` Andrew Morton
2006-10-06 19:01 ` Eric W. Biederman
2006-10-04 7:08 ` Eric W. Biederman
2006-10-04 14:23 ` Vivek Goyal
2006-10-05 3:09 ` Eric W. Biederman
2006-10-04 17:03 ` Vivek Goyal
2006-10-05 6:25 ` Eric W. Biederman
2006-10-05 21:34 ` Vivek Goyal
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