From: Shung-Hsi Yu <shung-hsi.yu@suse.com>
To: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
martin.lau@kernel.org, kernel-team@meta.com,
Eduard Zingerman <eddyz87@gmail.com>
Subject: Re: [PATCH v6 bpf-next 12/17] bpf: generalize is_branch_taken() to work with two registers
Date: Thu, 2 Nov 2023 23:19:44 +0800 [thread overview]
Message-ID: <ZUO-EB3MgBvrVkbq@u94a> (raw)
In-Reply-To: <20231102033759.2541186-13-andrii@kernel.org>
On Wed, Nov 01, 2023 at 08:37:54PM -0700, Andrii Nakryiko wrote:
> While still assuming that second register is a constant, generalize
> is_branch_taken-related code to accept two registers instead of register
> plus explicit constant value. This also, as a side effect, allows to
> simplify check_cond_jmp_op() by unifying BPF_K case with BPF_X case, for
> which we use a fake register to represent BPF_K's imm constant as
> a register.
>
> Acked-by: Eduard Zingerman <eddyz87@gmail.com>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
next prev parent reply other threads:[~2023-11-02 15:20 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-02 3:37 [PATCH v6 bpf-next 00/17] BPF register bounds logic and testing improvements Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 01/17] selftests/bpf: fix RELEASE=1 build for tc_opts Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 02/17] selftests/bpf: satisfy compiler by having explicit return in btf test Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 03/17] bpf: derive smin/smax from umin/max bounds Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 04/17] bpf: derive smin32/smax32 from umin32/umax32 bounds Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 05/17] bpf: derive subreg bounds from full bounds when upper 32 bits are constant Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 06/17] bpf: add special smin32/smax32 derivation from 64-bit bounds Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 07/17] bpf: improve deduction of 64-bit bounds from 32-bit bounds Andrii Nakryiko
2023-11-02 14:39 ` Shung-Hsi Yu
2023-11-02 16:17 ` Andrii Nakryiko
2023-11-03 3:43 ` Shung-Hsi Yu
2023-11-02 3:37 ` [PATCH v6 bpf-next 08/17] bpf: try harder to deduce register bounds from different numeric domains Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 09/17] bpf: drop knowledge-losing __reg_combine_{32,64}_into_{64,32} logic Andrii Nakryiko
2023-11-02 15:14 ` Shung-Hsi Yu
2023-11-02 3:37 ` [PATCH v6 bpf-next 10/17] selftests/bpf: BPF register range bounds tester Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 11/17] bpf: rename is_branch_taken reg arguments to prepare for the second one Andrii Nakryiko
2023-11-02 15:15 ` Shung-Hsi Yu
2023-11-02 3:37 ` [PATCH v6 bpf-next 12/17] bpf: generalize is_branch_taken() to work with two registers Andrii Nakryiko
2023-11-02 15:19 ` Shung-Hsi Yu [this message]
2023-11-02 3:37 ` [PATCH v6 bpf-next 13/17] bpf: move is_branch_taken() down Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 14/17] bpf: generalize is_branch_taken to handle all conditional jumps in one place Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 15/17] bpf: unify 32-bit and 64-bit is_branch_taken logic Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 16/17] bpf: prepare reg_set_min_max for second set of registers Andrii Nakryiko
2023-11-02 3:37 ` [PATCH v6 bpf-next 17/17] bpf: generalize reg_set_min_max() to handle two sets of two registers Andrii Nakryiko
2023-11-02 16:10 ` [PATCH v6 bpf-next 00/17] BPF register bounds logic and testing improvements patchwork-bot+netdevbpf
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