linux-kernel - [PATCH v2 0/3] RISC-V: Fix a few kexec_file

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Message-Id: <cover.1690365011.git.petr.tesarik.ext@huawei.com>
Date:   Wed, 26 Jul 2023 11:53:58 +0200
From:   Petr Tesarik <petrtesarik@...weicloud.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Li Huafei <lihuafei1@...wei.com>,
        Liao Chang <liaochang1@...wei.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Alyssa Ross <hi@...ssa.is>, Li Zhengyu <lizhengyu3@...wei.com>,
        linux-riscv@...ts.infradead.org (open list:RISC-V ARCHITECTURE),
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org (open list)
Cc:     Torsten Duwe <duwe@...e.de>,
        Roberto Sassu <roberto.sassu@...weicloud.com>, petr@...arici.cz
Subject: [PATCH v2 0/3] RISC-V: Fix a few kexec_file_load(2) failures

From: Petr Tesarik <petr.tesarik.ext@...wei.com>

The kexec_file_load(2) syscall does not work at least in some kernel
builds. For details see the relevant section in this blog post:

https://sigillatum.tesarici.cz/2023-07-21-state-of-riscv64-kdump.html

This patch series handles an additional relocation types, removes the need
to implement a Global Offset Table (GOT) for the purgatory and fixes the
placement of initrd.

Changelog
=========

Changes from v1:
- Replace memcmp() with a for loop.
- Drop handling of 16-bit add/subtract relocations. They were used only
  by alternatives in strcmp(), which was referenced only by string.o.
- Add the initrd placement fix.

Petr Tesarik (1):
  riscv/purgatory: do not link with string.o and its dependencies

Torsten Duwe (2):
  riscv/kexec: handle R_RISCV_CALL_PLT relocation type
  riscv/kexec: load initrd high in available memory

 arch/riscv/kernel/elf_kexec.c    |  3 ++-
 arch/riscv/purgatory/Makefile    | 26 +-------------------------
 arch/riscv/purgatory/purgatory.c |  6 ++++--
 3 files changed, 7 insertions(+), 28 deletions(-)

-- 
2.25.1