From: John Fastabend <john.fastabend@gmail.com>
To: Alexei Starovoitov <ast@kernel.org>, davem@davemloft.net
Cc: daniel@iogearbox.net, netdev@vger.kernel.org,
bpf@vger.kernel.org, kernel-team@fb.com
Subject: RE: [PATCH v3 bpf-next 3/9] bpf: extend is_branch_taken to registers
Date: Wed, 19 Jun 2019 23:01:10 -0700 [thread overview]
Message-ID: <5d0b2126214c3_12352ac65c3c65c06a@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <20190615191225.2409862-4-ast@kernel.org>
Alexei Starovoitov wrote:
> This patch extends is_branch_taken() logic from JMP+K instructions
> to JMP+X instructions.
> Conditional branches are often done when src and dst registers
> contain known scalars. In such case the verifier can follow
> the branch that is going to be taken when program executes.
> That speeds up the verification and is essential feature to support
> bounded loops.
>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
> Acked-by: Andrii Nakryiko <andriin@fb.com>
> ---
Acked-by: John Fastabend <john.fastabend@gmail.com>
next prev parent reply other threads:[~2019-06-20 6:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-15 19:12 [PATCH v3 bpf-next 0/9] bpf: bounded loops and other features Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 1/9] bpf: track spill/fill of constants Alexei Starovoitov
2019-06-20 0:24 ` John Fastabend
2019-06-20 3:35 ` Alexei Starovoitov
2019-06-20 5:04 ` John Fastabend
2019-06-20 15:37 ` Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 2/9] selftests/bpf: fix tests due to const spill/fill Alexei Starovoitov
2019-06-20 5:40 ` John Fastabend
2019-06-15 19:12 ` [PATCH v3 bpf-next 3/9] bpf: extend is_branch_taken to registers Alexei Starovoitov
2019-06-20 6:01 ` John Fastabend [this message]
2019-06-15 19:12 ` [PATCH v3 bpf-next 4/9] bpf: introduce bounded loops Alexei Starovoitov
2019-06-20 9:59 ` [bpf] 9fe4f05d33: kernel_selftests.bpf.test_verifier.fail kernel test robot
2019-06-15 19:12 ` [PATCH v3 bpf-next 5/9] bpf: fix callees pruning callers Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 6/9] selftests/bpf: fix tests Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 7/9] selftests/bpf: add basic verifier tests for loops Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 8/9] selftests/bpf: add realistic loop tests Alexei Starovoitov
2019-06-15 19:12 ` [PATCH v3 bpf-next 9/9] bpf: precise scalar_value tracking Alexei Starovoitov
2019-06-17 17:20 ` Andrii Nakryiko
2019-06-17 16:39 ` [PATCH v3 bpf-next 0/9] bpf: bounded loops and other features Andrii Nakryiko
2019-06-17 18:57 ` Alexei Starovoitov
2019-06-17 19:06 ` Andrii Nakryiko
2019-06-18 14:05 ` Paul Chaignon
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