RE: [RESEND PATCH v4 0/8] bpf powerpc: Add BPF_PROBE_MEM support in powerpc JIT compiler
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From: David Laight <hidden>
Date: 2021-10-14 08:15:31
Also in:
bpf, linuxppc-dev
From: Hari Bathini
Sent: 12 October 2021 13:31 Patch #1 & #2 are simple cleanup patches. Patch #3 refactors JIT compiler code with the aim to simplify adding BPF_PROBE_MEM support. Patch #4 introduces PPC_RAW_BRANCH() macro instead of open coding branch instruction. Patch #5 & #7 add BPF_PROBE_MEM support for PPC64 & PPC32 JIT compilers respectively. Patch #6 & #8 handle bad userspace pointers for PPC64 & PPC32 cases respectively.
I thought that BPF was only allowed to do fairly restricted memory accesses - so WTF does it need a BPF_PROBE_MEM instruction? David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)