From: Conor Dooley <conor@kernel.org>
To: Puranjay Mohan <puranjay12@gmail.com>
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Björn Töpel" <bjorn@kernel.org>,
"Luke Nelson" <luke.r.nels@gmail.com>,
"Xi Wang" <xi.wang@gmail.com>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
bpf@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Pu Lehui" <pulehui@huaweicloud.com>
Subject: Re: [PATCH bpf-next v2 2/2] bpf,riscv: Implement bpf_addr_space_cast instruction
Date: Mon, 25 Mar 2024 19:10:33 +0000 [thread overview]
Message-ID: <20240325-nineteen-unvaried-cb5cb5fd3a73@spud> (raw)
In-Reply-To: <20240325155434.65589-3-puranjay12@gmail.com>
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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@gmail.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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next prev parent reply other threads:[~2024-03-25 19:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 15:54 [PATCH bpf-next v2 0/2] bpf,riscv: Add support for BPF Arena Puranjay Mohan
2024-03-25 15:54 ` [PATCH bpf-next v2 1/2] bpf,riscv: Implement PROBE_MEM32 pseudo instructions Puranjay Mohan
2024-03-25 16:53 ` Björn Töpel
2024-03-25 17:15 ` Puranjay Mohan
2024-03-26 3:15 ` Pu Lehui
2024-03-25 15:54 ` [PATCH bpf-next v2 2/2] bpf,riscv: Implement bpf_addr_space_cast instruction Puranjay Mohan
2024-03-25 19:10 ` Conor Dooley [this message]
2024-03-25 19:13 ` Puranjay Mohan
2024-03-25 19:19 ` Conor Dooley
2024-03-25 19:23 ` Puranjay Mohan
2024-03-25 19:40 ` Conor Dooley
2024-03-25 20:19 ` Björn Töpel
2024-03-25 20:31 ` Björn Töpel
2024-03-26 1:43 ` Pu Lehui
2024-03-25 20:15 ` Björn Töpel
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