netdev - Re: [PATCH bpf] s390/bpf: fix lcgr instruction encoding

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Message-ID: <b1b85cd7-fbf8-af4a-344a-54ffad867585@iogearbox.net>
Date:   Mon, 12 Aug 2019 18:06:24 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     gor@...ux.ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH bpf] s390/bpf: fix lcgr instruction encoding

On 8/12/19 5:03 PM, Ilya Leoshkevich wrote:
> "masking, test in bounds 3" fails on s390, because
> BPF_ALU64_IMM(BPF_NEG, BPF_REG_2, 0) ignores the top 32 bits of
> BPF_REG_2. The reason is that JIT emits lcgfr instead of lcgr.
> The associated comment indicates that the code was intended to emit lcgr
> in the first place, it's just that the wrong opcode was used.
> 
> Fix by using the correct opcode.
> 
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>

Applied, thanks!