From: KP Singh <kpsingh@kernel.org>
To: Xu Kuohai <xukuohai@huawei.com>
Cc: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Zi Shen Lim <zlim.lnx@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, hpa@zytor.com, Shuah Khan <shuah@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Ard Biesheuvel <ardb@kernel.org>,
Daniel Kiss <daniel.kiss@arm.com>,
Steven Price <steven.price@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Marc Zyngier <maz@kernel.org>,
Peter Collingbourne <pcc@google.com>,
Mark Brown <broonie@kernel.org>, Delyan Kratunov <delyank@fb.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>
Subject: Re: [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support
Date: Mon, 23 May 2022 03:39:57 +0200 [thread overview]
Message-ID: <CACYkzJ4aetRT0SuF3Kh5MOMw3y_AQP8qNoDxFdz_0hypQ6H10w@mail.gmail.com> (raw)
In-Reply-To: <20220518131638.3401509-2-xukuohai@huawei.com>
On Wed, May 18, 2022 at 3:53 PM Xu Kuohai <xukuohai@huawei.com> wrote:
>
> Add ftrace direct support for arm64.
>
> 1. When there is custom trampoline only, replace the fentry nop to a
> jump instruction that jumps directly to the custom trampoline.
>
> 2. When ftrace trampoline and custom trampoline coexist, jump from
> fentry to ftrace trampoline first, then jump to custom trampoline
> when ftrace trampoline exits. The current unused register
> pt_regs->orig_x0 is used as an intermediary for jumping from ftrace
> trampoline to custom trampoline.
>
> Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
> Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: KP Singh <kpsingh@kernel.org>
WARNING: multiple messages have this Message-ID (diff)
From: KP Singh <kpsingh@kernel.org>
To: Xu Kuohai <xukuohai@huawei.com>
Cc: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Zi Shen Lim <zlim.lnx@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, hpa@zytor.com, Shuah Khan <shuah@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Ard Biesheuvel <ardb@kernel.org>,
Daniel Kiss <daniel.kiss@arm.com>,
Steven Price <steven.price@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Marc Zyngier <maz@kernel.org>,
Peter Collingbourne <pcc@google.com>,
Mark Brown <broonie@kernel.org>, Delyan Kratunov <delyank@fb.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>
Subject: Re: [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support
Date: Mon, 23 May 2022 03:39:57 +0200 [thread overview]
Message-ID: <CACYkzJ4aetRT0SuF3Kh5MOMw3y_AQP8qNoDxFdz_0hypQ6H10w@mail.gmail.com> (raw)
In-Reply-To: <20220518131638.3401509-2-xukuohai@huawei.com>
On Wed, May 18, 2022 at 3:53 PM Xu Kuohai <xukuohai@huawei.com> wrote:
>
> Add ftrace direct support for arm64.
>
> 1. When there is custom trampoline only, replace the fentry nop to a
> jump instruction that jumps directly to the custom trampoline.
>
> 2. When ftrace trampoline and custom trampoline coexist, jump from
> fentry to ftrace trampoline first, then jump to custom trampoline
> when ftrace trampoline exits. The current unused register
> pt_regs->orig_x0 is used as an intermediary for jumping from ftrace
> trampoline to custom trampoline.
>
> Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
> Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: KP Singh <kpsingh@kernel.org>
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next prev parent reply other threads:[~2022-05-23 1:40 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 13:16 [PATCH bpf-next v5 0/6] bpf trampoline for arm64 Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-18 13:16 ` [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-23 1:39 ` KP Singh [this message]
2022-05-23 1:39 ` KP Singh
2022-05-25 13:38 ` Mark Rutland
2022-05-25 13:38 ` Mark Rutland
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 10:06 ` Mark Rutland
2022-05-26 10:06 ` Mark Rutland
2022-05-26 14:48 ` Xu Kuohai
2022-05-26 14:48 ` Xu Kuohai
2022-06-06 16:35 ` Mark Rutland
2022-06-06 16:35 ` Mark Rutland
2022-06-09 4:27 ` Xu Kuohai
2022-06-09 4:27 ` Xu Kuohai
2022-08-09 17:03 ` Florent Revest
2022-08-09 17:03 ` Florent Revest
2022-08-10 8:10 ` Xu Kuohai
2022-08-10 8:10 ` Xu Kuohai
2022-05-18 13:16 ` [PATCH bpf-next v5 2/6] ftrace: Fix deadloop caused by direct call in ftrace selftest Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-25 13:43 ` Mark Rutland
2022-05-25 13:43 ` Mark Rutland
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 9:45 ` Xu Kuohai
2022-05-18 13:16 ` [PATCH bpf-next v5 3/6] bpf: Remove is_valid_bpf_tramp_flags() Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-25 13:45 ` Mark Rutland
2022-05-25 13:45 ` Mark Rutland
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 10:12 ` Mark Rutland
2022-05-26 10:12 ` Mark Rutland
2022-05-26 14:46 ` Xu Kuohai
2022-05-26 14:46 ` Xu Kuohai
2022-05-18 13:16 ` [PATCH bpf-next v5 4/6] bpf, arm64: Impelment bpf_arch_text_poke() for arm64 Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-23 1:41 ` KP Singh
2022-05-23 1:41 ` KP Singh
2022-05-25 14:10 ` Mark Rutland
2022-05-25 14:10 ` Mark Rutland
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 9:45 ` Xu Kuohai
2022-05-26 10:34 ` Mark Rutland
2022-05-26 10:34 ` Mark Rutland
2022-05-26 14:47 ` Xu Kuohai
2022-05-26 14:47 ` Xu Kuohai
2022-05-18 13:16 ` [PATCH bpf-next v5 5/6] bpf, arm64: bpf trampoline " Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
2022-05-20 21:18 ` Alexei Starovoitov
2022-05-20 21:18 ` Alexei Starovoitov
2022-05-23 16:09 ` Mark Rutland
2022-05-23 16:09 ` Mark Rutland
2022-05-23 1:36 ` KP Singh
2022-05-23 1:36 ` KP Singh
2022-05-18 13:16 ` [PATCH bpf-next v5 6/6] selftests/bpf: Fix trivial typo in fentry_fexit.c Xu Kuohai
2022-05-18 13:16 ` Xu Kuohai
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