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| author | Björn Töpel | 2019-02-05 13:41:22 +0100 |
|---|---|---|
| committer | Daniel Borkmann | 2019-02-05 16:56:10 +0100 |
| commit | 2353ecc6f91fd15b893fa01bf85a1c7a823ee4f2 (patch) | |
| tree | 309a4f88c91f36813f16d88cc8627a737779b4fe /arch/riscv/Makefile | |
| parent | Merge branch 'bpf-btf-dedup' (diff) | |
| download | kernel-qcow2-linux-2353ecc6f91fd15b893fa01bf85a1c7a823ee4f2.tar.gz kernel-qcow2-linux-2353ecc6f91fd15b893fa01bf85a1c7a823ee4f2.tar.xz kernel-qcow2-linux-2353ecc6f91fd15b893fa01bf85a1c7a823ee4f2.zip | |
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>
Diffstat (limited to 'arch/riscv/Makefile')
| -rw-r--r-- | arch/riscv/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 4b594f2e4f7e..c6342e638ef7 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -77,7 +77,7 @@ KBUILD_IMAGE := $(boot)/Image.gz head-y := arch/riscv/kernel/head.o -core-y += arch/riscv/kernel/ arch/riscv/mm/ +core-y += arch/riscv/kernel/ arch/riscv/mm/ arch/riscv/net/ libs-y += arch/riscv/lib/ |