Re: [PATCH bpf-next,v3] riscv, bpf: Add BPF exception tables
From: patchwork-bot+netdevbpf@kernel.org
Date: 2021-10-27 23:10:10
Also in:
bpf, linux-riscv, lkml
From: patchwork-bot+netdevbpf@kernel.org
Date: 2021-10-27 23:10:10
Also in:
bpf, linux-riscv, lkml
Hello: This patch was applied to bpf/bpf-next.git (master) by Daniel Borkmann [off-list ref]: On Wed, 27 Oct 2021 11:18:22 +0000 you wrote:
When a tracing BPF program attempts to read memory without using the bpf_probe_read() helper, the verifier marks the load instruction with the BPF_PROBE_MEM flag. Since the riscv JIT does not currently recognize this flag it falls back to the interpreter. Add support for BPF_PROBE_MEM, by appending an exception table to the BPF program. If the load instruction causes a data abort, the fixup infrastructure finds the exception table and fixes up the fault, by clearing the destination register and jumping over the faulting instruction. [...]
Here is the summary with links:
- [bpf-next,v3] riscv, bpf: Add BPF exception tables
https://git.kernel.org/bpf/bpf-next/c/252c765bd764
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