[PATCH v7 bpf-next 0/7] Allocate bpf trampoline on bpf_prog_pack

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This set enables allocating bpf trampoline from bpf_prog_pack on x86. The
majority of this work, however, is the refactoring of trampoline code.
This is needed because we need to handle 4 archs and 2 users (trampoline
and struct_ops).

1/7 through 6/7 refactors trampoline code. A few helpers are added.
7/7 finally let bpf trampoline on x86 use bpf_prog_pack.

Changes in v7:
1. Use kvmalloc for rw_image in x86/arch_prepare_bpf_trampoline. (Alexei)
2. Add comment to explain why we cannot use kvmalloc in
   x86/arch_bpf_trampoline_size. (Alexei)

Changes in v6:
1. Rebase.
2. Add Acked-by and Tested-by from Jiri Olsa and Björn Töpel.

Changes in v5:
1. Adjust size of trampoline ksym. (Jiri)
2. Use "unsigned int size" arg in image management helpers.(Daniel)

Changes in v4:
1. Dropped 1/8 in v3, which is already merged in bpf-next.
2. Add Reviewed-by from Björn Töpel.

Changes in v3:
1. Fix bug in s390. (Thanks to Ilya Leoshkevich).
2. Fix build error in riscv. (kernel test robot).

Changes in v2:
1. Add missing changes in net/bpf/bpf_dummy_struct_ops.c.
2. Reduce one dry run in arch_prepare_bpf_trampoline. (Xu Kuohai)
3. Other small fixes.

Song Liu (7):
  bpf: Let bpf_prog_pack_free handle any pointer
  bpf: Adjust argument names of arch_prepare_bpf_trampoline()
  bpf: Add helpers for trampoline image management
  bpf, x86: Adjust arch_prepare_bpf_trampoline return value
  bpf: Add arch_bpf_trampoline_size()
  bpf: Use arch_bpf_trampoline_size
  x86, bpf: Use bpf_prog_pack for bpf trampoline

 arch/arm64/net/bpf_jit_comp.c   |  55 +++++++++-----
 arch/riscv/net/bpf_jit_comp64.c |  25 +++---
 arch/s390/net/bpf_jit_comp.c    |  56 ++++++++------
 arch/x86/net/bpf_jit_comp.c     | 130 +++++++++++++++++++++++++-------
 include/linux/bpf.h             |  14 +++-
 include/linux/filter.h          |   2 +-
 kernel/bpf/bpf_struct_ops.c     |  19 +++--
 kernel/bpf/core.c               |  21 +++---
 kernel/bpf/dispatcher.c         |   7 +-
 kernel/bpf/trampoline.c         | 101 +++++++++++++++++++------
 net/bpf/bpf_dummy_struct_ops.c  |   7 +-
 11 files changed, 305 insertions(+), 132 deletions(-)

--
2.34.1




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