[v6,0/3] xen: introduce Kconfig function alignment option

Message

Roger Pau Monné Feb. 7, 2024, 2:55 p.m. UTC

Hello,

The following series adds an additional Kconfig option for the per-arch
code alignment.  Such alignment is to be used in all assembly code
symbols and C functions unless specified otherwise.

Last patch also uses such alignment in order to guarantee enough
distance between function entry points, so that there's always space in
order to do the instruction replacements required by livepatch.

Thanks, Roger.

Roger Pau Monne (3):
  xen: introduce Kconfig function alignment option
  xen: use explicit function alignment if supported by compiler
  xen/livepatch: align functions to ensure minimal distance between
    entry points

 xen/Kconfig                         | 22 ++++++++++++++++++++++
 xen/Makefile                        |  1 +
 xen/arch/arm/Kconfig                |  1 +
 xen/arch/arm/include/asm/config.h   |  3 +--
 xen/arch/arm/livepatch.c            |  2 ++
 xen/arch/arm/xen.lds.S              |  4 ++++
 xen/arch/ppc/Kconfig                |  1 +
 xen/arch/ppc/include/asm/config.h   |  3 ---
 xen/arch/ppc/xen.lds.S              |  4 ++++
 xen/arch/riscv/Kconfig              |  1 +
 xen/arch/riscv/include/asm/config.h |  1 -
 xen/arch/riscv/xen.lds.S            |  4 ++++
 xen/arch/x86/Kconfig                |  1 +
 xen/arch/x86/include/asm/config.h   |  3 +--
 xen/arch/x86/livepatch.c            |  4 ++++
 xen/arch/x86/xen.lds.S              |  4 ++++
 xen/common/Kconfig                  |  5 ++++-
 xen/include/xen/linkage.h           |  5 +++--
 18 files changed, 58 insertions(+), 11 deletions(-)