[PATCH v2 0/6] x86/boot: Clean up handling of boot_params pointer

Brian Gerst
2023-04-12T18:45:20Z

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(-)

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2.39.2