From: Ilya Leoshkevich <iii@linux.ibm.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: bpf@vger.kernel.org, Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v2 0/4] s390/bpf: implement BPF_PROBE_MEM
Date: Thu, 16 Jul 2020 01:32:57 +0200 [thread overview]
Message-ID: <20200715233301.933201-1-iii@linux.ibm.com> (raw)
This patch series implements BPF_PROBE_MEM opcode, which is used in BPF
programs that walk chains of kernel pointers. It consists of two parts:
patches 1 and 2 enhance s390 exception table infrastructure, patches 3
and 4 contains the actual implementation and the test.
We would like to take this series via s390 tree, because it contains
dependent s390 extable and bpf jit changes. However, it would be great
if someone knowledgeable could review patches 3 and 4.
v1 -> v2:
- Add `jit->excnt = 0` in order to fix WARNINGs and fallbacks to the
interpreter when running extra_pass. This wasn't easy to spot on
bpf-next, since tests passed anyway. However, on v5.8-rc5 this led
to panics.
Ilya Leoshkevich (4):
s390/kernel: unify EX_TABLE* implementations
s390/kernel: expand the exception table logic to allow new handling
options
s390/bpf: implement BPF_PROBE_MEM
selftests/bpf: add exception handling test
arch/s390/include/asm/asm-const.h | 12 ++
arch/s390/include/asm/extable.h | 50 ++++++-
arch/s390/include/asm/linkage.h | 35 ++---
arch/s390/kernel/kprobes.c | 4 +-
arch/s390/kernel/traps.c | 7 +-
arch/s390/mm/fault.c | 4 +-
arch/s390/net/bpf_jit_comp.c | 139 +++++++++++++++++-
scripts/sorttable.c | 25 ++++
.../selftests/bpf/prog_tests/bpf_iter.c | 17 +++
.../selftests/bpf/progs/bpf_iter_exception.c | 20 +++
10 files changed, 273 insertions(+), 40 deletions(-)
create mode 100644 arch/s390/include/asm/asm-const.h
create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_exception.c
--
2.25.4
next reply other threads:[~2020-07-15 23:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-15 23:32 Ilya Leoshkevich [this message]
2020-07-15 23:32 ` [PATCH v2 1/4] s390/kernel: unify EX_TABLE* implementations Ilya Leoshkevich
2020-07-15 23:32 ` [PATCH v2 2/4] s390/kernel: expand the exception table logic to allow new handling options Ilya Leoshkevich
2020-07-15 23:33 ` [PATCH v2 3/4] s390/bpf: implement BPF_PROBE_MEM Ilya Leoshkevich
2020-07-16 11:09 ` Heiko Carstens
2020-07-15 23:33 ` [PATCH v2 4/4] selftests/bpf: add exception handling test Ilya Leoshkevich
2020-07-21 18:01 ` [PATCH v2 0/4] s390/bpf: implement BPF_PROBE_MEM Alexei Starovoitov
2020-07-21 20:16 ` Heiko Carstens
2020-07-21 20:23 ` Alexei Starovoitov
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