linux-kernel - [PATCH v2 0/6] x86/boot: Clean up handling of boot

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Message-Id: <20230412184502.145289-1-brgerst@gmail.com>
Date:   Wed, 12 Apr 2023 14:44:56 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 0/6] x86/boot: Clean up handling of boot_params pointer

On entry from the bootloader, RSI contains the pointer to the boot_params
data structure.  The pointer is passed to x86_64_start_kernel(), which
requires preserving RSI all the way though the early boot asm code.
Change it to copy the boot_params data as soon as possible, which also
has the benefit of not needing to remap the real mode data pages if
memory encryption is enabled.

Note: The memory encryption changes are untested due to lack of hardware.

Brian Gerst (6):
  x86/boot: Move sanitize_boot_params()
  x86/boot: Remove extra call to copy_bootdata()
  x86/boot: Clean up get_cmd_line_ptr()
  x86/boot: Move copy_bootdata() to very early boot.
  x86/boot: Use copied boot data in __startup_64()
  x86/boot: Use copied boot data in sme_enable()

 arch/x86/include/asm/mem_encrypt.h |  4 +-
 arch/x86/include/asm/setup.h       |  9 +++--
 arch/x86/kernel/head64.c           | 59 ++++++++++-------------------
 arch/x86/kernel/head_64.S          | 26 +++----------
 arch/x86/kernel/setup.c            |  2 +-
 arch/x86/mm/mem_encrypt_amd.c      | 61 ------------------------------
 arch/x86/mm/mem_encrypt_identity.c | 42 ++++++++++----------
 arch/x86/xen/enlighten_pv.c        |  2 +-
 8 files changed, 58 insertions(+), 147 deletions(-)

-- 
2.39.2