linux-kernel - Re: [PATCH bpf-next v2 2/2] bpf,riscv: Implement bpf_addr_space

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Date: Mon, 25 Mar 2024 19:10:33 +0000
From: Conor Dooley <conor@...nel.org>
To: Puranjay Mohan <puranjay12@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Björn Töpel <bjorn@...nel.org>,
	Luke Nelson <luke.r.nels@...il.com>, Xi Wang <xi.wang@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, bpf@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Pu Lehui <pulehui@...weicloud.com>
Subject: Re: [PATCH bpf-next v2 2/2] bpf,riscv: Implement bpf_addr_space_cast
 instruction

On Mon, Mar 25, 2024 at 03:54:34PM +0000, Puranjay Mohan wrote:
> LLVM generates bpf_addr_space_cast instruction while translating
> pointers between native (zero) address space and
> __attribute__((address_space(N))). The addr_space=0 is reserved as
> bpf_arena address space.
> 
> rY = addr_space_cast(rX, 0, 1) is processed by the verifier and
> converted to normal 32-bit move: wX = wY
> 
> rY = addr_space_cast(rX, 1, 0) has to be converted by JIT.
> 
> Signed-off-by: Puranjay Mohan <puranjay12@...il.com>

Doesn't compile for allmodconfig:
  ../arch/riscv/net/bpf_jit_comp64.c:1086:7: error: call to undeclared function 'insn_is_cast_user'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]

Cheers,
Conor.

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