[PATCH v3 0/4] x86: Always try to fill acpi_rsdp_addr in boot params

Kairui Song kasong at redhat.com
Thu May 23 23:23:17 PDT 2019

This patch sync the behavior of user space kexec and kexec_file_load,
they will both fill the boot_params.acpi_rsdp_addr with a valid RSDP
value, to make sure second kernel can always get the RSDP consistently.

This will make it effortless to boot newer version of kernel (5.0+)
without specifying acpi_rsdp= cmdline on EFI system even with EFI
service disabled. Should not change any behavior with older kernels.

Update from V2:
  - Drop unneeded 'packed' attribute for boot parameters structure
  - Don't trust kernel cmdline as a reliable acpi rsdp source

Update from V1:
  - Split into multiple patches for a cleaner structure, content is not

Kairui Song (4):
  x86: Update boot parameters defination
  x86: Introduce helpers for getting RSDP address
  x86: Always try to fill acpi_rsdp_addr in boot params
  crashdump/x86: Use new introduce helper for getting RSDP

 include/x86/x86-linux.h            |  6 +++--
 kexec/arch/i386/crashdump-x86.c    | 34 +++++++----------------
 kexec/arch/i386/kexec-x86-common.c | 43 ++++++++++++++++++++++++++++++
 kexec/arch/i386/kexec-x86.h        |  1 +
 kexec/arch/i386/x86-linux-setup.c  |  6 +++--
 kexec/arch/i386/x86-linux-setup.h  |  1 +
 6 files changed, 62 insertions(+), 29 deletions(-)


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