[PATCHv2,0/2] x86: Fix boot with some memory above MAXMEM

Message

Kirill A . Shutemov June 8, 2020, 12:54 p.m. UTC

A 5-level paging capable machine can have memory above 46-bit in the
physical address space. This memory is only addressable in the 5-level
paging mode: we don't have enough virtual address space to create direct
mapping for such memory in the 4-level paging mode.

Tested with a hacked QEMU: https://gist.github.com/kiryl/d45eb54110944ff95e544972d8bdac1d

v2:
 - Fix boot with KASLR enabled on such machines;
 - Better error message;

Kirill A. Shutemov (2):
  x86/mm: Fix boot with some memory above MAXMEM
  x86/boot/KASLR: Fix boot with some memory above MAXMEM

 arch/x86/boot/compressed/kaslr.c | 11 +++++++++++
 arch/x86/kernel/e820.c           | 24 ++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)