[PATCH RFC 0/4] x86/fixmap: Unify FIXADDR_TOP

[Hou Wenlong]

This patchset unifies FIXADDR_TOP as a variable for x86, allowing the
fixmap area to be movable and relocated with the kernel image in the
x86/PIE patchset [0]. This enables the kernel image to be relocated in
the top 512G of the address space.

[0] https://lore.kernel.org/lkml/cover.1682673542.git.houwenlong.hwl@xxxxxxxxxxxx

Hou Wenlong (4):
  x86/vsyscall: Don't use set_fixmap() to map vsyscall page
  x86/xen: Pin up to VSYSCALL_ADDR when vsyscall page is out of fixmap
    area
  x86/fixmap: Move vsyscall page out of fixmap area
  x86/fixmap: Unify FIXADDR_TOP

 arch/x86/entry/vsyscall/vsyscall_64.c |  7 +-----
 arch/x86/include/asm/fixmap.h         | 28 ++++-------------------
 arch/x86/include/asm/paravirt.h       |  7 ++++++
 arch/x86/include/asm/paravirt_types.h |  4 ++++
 arch/x86/include/asm/vsyscall.h       | 13 +++++++++++
 arch/x86/kernel/head64.c              |  1 -
 arch/x86/kernel/head_64.S             |  6 ++---
 arch/x86/kernel/paravirt.c            |  4 ++++
 arch/x86/mm/dump_pagetables.c         |  3 ++-
 arch/x86/mm/fault.c                   |  1 -
 arch/x86/mm/init_64.c                 |  2 +-
 arch/x86/mm/ioremap.c                 |  5 ++---
 arch/x86/mm/pgtable.c                 | 13 +++++++++++
 arch/x86/mm/pgtable_32.c              |  3 ---
 arch/x86/xen/mmu_pv.c                 | 32 +++++++++++++++++++--------
 15 files changed, 77 insertions(+), 52 deletions(-)


base-commit: f585d5177e1aad174fd6da0e3936b682ed58ced0
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2.31.1