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Björn Töpel 2353ecc6f9 bpf, riscv: add BPF JIT for RV64G 
This commit adds a BPF JIT for RV64G.

The JIT is a two-pass JIT, and has a dynamic prolog/epilogue (similar
to the MIPS64 BPF JIT) instead of static ones (e.g. x86_64).

At the moment the RISC-V Linux port does not support
CONFIG_HAVE_KPROBES, which means that CONFIG_BPF_EVENTS is not
supported. Thus, no tests involving BPF_PROG_TYPE_TRACEPOINT,
BPF_PROG_TYPE_PERF_EVENT, BPF_PROG_TYPE_KPROBE and
BPF_PROG_TYPE_RAW_TRACEPOINT passes.

The implementation does not support "far branching" (>4KiB).

Test results:
  # modprobe test_bpf
  test_bpf: Summary: 378 PASSED, 0 FAILED, [366/366 JIT'ed]

  # echo 1 > /proc/sys/kernel/unprivileged_bpf_disabled
  # ./test_verifier
  ...
  Summary: 761 PASSED, 507 SKIPPED, 2 FAILED

Note that "test_verifier" was run with one build with
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y and one without, otherwise
many of the the tests that require unaligned access were skipped.

CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y:
  # echo 1 > /proc/sys/kernel/unprivileged_bpf_disabled
  # ./test_verifier | grep -c 'NOTE.*unknown align'
  0

No CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS:
  # echo 1 > /proc/sys/kernel/unprivileged_bpf_disabled
  # ./test_verifier | grep -c 'NOTE.*unknown align'
  59

The two failing test_verifier tests are:
  "ld_abs: vlan + abs, test 1"
  "ld_abs: jump around ld_abs"

This is due to that "far branching" involved in those tests.

All tests where done on QEMU (QEMU emulator version 3.1.50
(v3.1.0-688-g8ae951fbc106)).

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-02-05 16:56:10 +01:00
..
boot RISC-V: Build flat and compressed kernel images 2018-11-20 05:19:09 -08:00
configs RISC-V: defconfig: Enable RISC-V SBI earlycon support 2018-12-17 10:23:46 -08:00
include Fix a handful of audit-related issue 2019-01-07 08:45:47 -08:00
kernel Fix a handful of audit-related issue 2019-01-07 08:45:47 -08:00
lib RISC-V: lib: minor asm cleanup 2018-12-21 08:17:02 -08:00
mm mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
net bpf, riscv: add BPF JIT for RV64G 2019-02-05 16:56:10 +01:00
Kconfig bpf, riscv: add BPF JIT for RV64G 2019-02-05 16:56:10 +01:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Makefile bpf, riscv: add BPF JIT for RV64G 2019-02-05 16:56:10 +01:00