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* [PATCH bpf-next v4 0/2] bpf,riscv: Add support for BPF Arena
@ 2024-04-04 11:42 Puranjay Mohan
  2024-04-04 11:42 ` [PATCH bpf-next v4 1/2] bpf,riscv: Implement PROBE_MEM32 pseudo instructions Puranjay Mohan
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Puranjay Mohan @ 2024-04-04 11:42 UTC (permalink / raw)
  To: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko,
	Martin KaFai Lau, Eduard Zingerman, Song Liu, Yonghong Song,
	John Fastabend, KP Singh, Stanislav Fomichev, Hao Luo, Jiri Olsa,
	Björn Töpel, Luke Nelson, Xi Wang, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, bpf, linux-riscv, linux-kernel,
	Pu Lehui
  Cc: puranjay12

Changes in V4:
V3: https://lore.kernel.org/all/20240326224943.86912-1-puranjay12@gmail.com/
- Fix some style issues.
- Add Tested-by: and Reviewed-by: tags by Pu Lehui and Björn

Changes in V3
V2: https://lore.kernel.org/bpf/20240325155434.65589-1-puranjay12@gmail.com/
- Use REG_DONT_CLEAR_MARKER in place of DONT_CLEAR as the name.
- Use RV_REG_ZERO for the above as it is guaranteed to be never used in as
  dst/src register in BPF LDX/STX/ST instructions.
- Use #define RV_REG_ARENA for RV_REG_S7

Changes in V2
V1: https://lore.kernel.org/bpf/20240323154652.54572-1-puranjay12@gmail.com/
- Used S7 in place of S11 for storing the kernel_vm_start
- Used 17 in place of 16 for DONT_CLEAR marker
- Remove an unused variable
- Removed some misleading information from the commit message.

This series adds the support for PROBE_MEM32 and bpf_addr_space_cast
instructions to the RISCV BPF JIT. These two instructions allow the
enablement of BPF Arena.

All arena related selftests are passing:

  root@rv-tester:~/bpf# uname -p
  riscv64
  root@rv-tester:~/bpf# ./test_progs -a "*arena*"
  #3/1     arena_htab/arena_htab_llvm:OK
  #3/2     arena_htab/arena_htab_asm:OK
  #3       arena_htab:OK
  #4/1     arena_list/arena_list_1:OK
  #4/2     arena_list/arena_list_1000:OK
  #4       arena_list:OK
  #434/1   verifier_arena/basic_alloc1:OK
  #434/2   verifier_arena/basic_alloc2:OK
  #434/3   verifier_arena/basic_alloc3:OK
  #434/4   verifier_arena/iter_maps1:OK
  #434/5   verifier_arena/iter_maps2:OK
  #434/6   verifier_arena/iter_maps3:OK
  #434     verifier_arena:OK
  Summary: 3/10 PASSED, 0 SKIPPED, 0 FAILED

Puranjay Mohan (2):
  bpf,riscv: Implement PROBE_MEM32 pseudo instructions
  bpf,riscv: Implement bpf_addr_space_cast instruction

 arch/riscv/net/bpf_jit.h        |   2 +
 arch/riscv/net/bpf_jit_comp64.c | 203 +++++++++++++++++++++++++++++++-
 arch/riscv/net/bpf_jit_core.c   |   2 +
 3 files changed, 205 insertions(+), 2 deletions(-)

-- 
2.40.1


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Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-04-04 11:42 [PATCH bpf-next v4 0/2] bpf,riscv: Add support for BPF Arena Puranjay Mohan
2024-04-04 11:42 ` [PATCH bpf-next v4 1/2] bpf,riscv: Implement PROBE_MEM32 pseudo instructions Puranjay Mohan
2024-04-04 11:42 ` [PATCH bpf-next v4 2/2] bpf,riscv: Implement bpf_addr_space_cast instruction Puranjay Mohan
2024-04-04 14:50 ` [PATCH bpf-next v4 0/2] bpf,riscv: Add support for BPF Arena patchwork-bot+netdevbpf

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