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From: Xu Kuohai <xukuohai@huaweicloud.com>
To: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
	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>, Zi Shen Lim <zlim.lnx@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: [RESEND PATCH bpf-next 0/2] Jit BPF_CALL to direct call when possible
Date: Mon, 19 Sep 2022 05:21:36 -0400	[thread overview]
Message-ID: <20220919092138.1027353-1-xukuohai@huaweicloud.com> (raw)

Currently BPF_CALL is always jited to indirect call, but when target is
in the range of direct call, a BPF_CALL can be jited to direct call.

For example, the following BPF_CALL

    call __htab_map_lookup_elem

is always jited to an indirect call:

    mov     x10, #0xffffffffffff18f4
    movk    x10, #0x821, lsl #16
    movk    x10, #0x8000, lsl #32
    blr     x10

When the target is in the range of a direct call, it can be jited to:

    bl      0xfffffffffd33bc98

This patchset does such jit.

Xu Kuohai (2):
  bpf, arm64: Jit BPF_CALL to direct call when possible
  bpf, arm64: Eliminate false -EFBIG error in bpf trampoline

 arch/arm64/net/bpf_jit_comp.c | 136 ++++++++++++++++++++++------------
 1 file changed, 87 insertions(+), 49 deletions(-)

-- 
2.30.2


WARNING: multiple messages have this Message-ID (diff)
From: Xu Kuohai <xukuohai@huaweicloud.com>
To: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
	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>, Zi Shen Lim <zlim.lnx@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: [RESEND PATCH bpf-next 0/2] Jit BPF_CALL to direct call when possible
Date: Mon, 19 Sep 2022 05:21:36 -0400	[thread overview]
Message-ID: <20220919092138.1027353-1-xukuohai@huaweicloud.com> (raw)

Currently BPF_CALL is always jited to indirect call, but when target is
in the range of direct call, a BPF_CALL can be jited to direct call.

For example, the following BPF_CALL

    call __htab_map_lookup_elem

is always jited to an indirect call:

    mov     x10, #0xffffffffffff18f4
    movk    x10, #0x821, lsl #16
    movk    x10, #0x8000, lsl #32
    blr     x10

When the target is in the range of a direct call, it can be jited to:

    bl      0xfffffffffd33bc98

This patchset does such jit.

Xu Kuohai (2):
  bpf, arm64: Jit BPF_CALL to direct call when possible
  bpf, arm64: Eliminate false -EFBIG error in bpf trampoline

 arch/arm64/net/bpf_jit_comp.c | 136 ++++++++++++++++++++++------------
 1 file changed, 87 insertions(+), 49 deletions(-)

-- 
2.30.2


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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2022-09-19  9:04 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-19  9:21 Xu Kuohai [this message]
2022-09-19  9:21 ` [RESEND PATCH bpf-next 0/2] Jit BPF_CALL to direct call when possible Xu Kuohai
2022-09-19  9:21 ` [RESEND PATCH bpf-next 1/2] bpf, arm64: " Xu Kuohai
2022-09-19  9:21   ` Xu Kuohai
2022-09-26 20:29   ` Daniel Borkmann
2022-09-26 20:29     ` Daniel Borkmann
2022-09-27 14:01     ` Xu Kuohai
2022-09-27 14:01       ` Xu Kuohai
2022-10-13  2:07       ` Xu Kuohai
2022-10-13  2:07         ` Xu Kuohai
2022-09-19  9:21 ` [RESEND PATCH bpf-next 2/2] bpf, arm64: Eliminate false -EFBIG error in bpf trampoline Xu Kuohai
2022-09-19  9:21   ` Xu Kuohai

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