From: Hari Bathini <hbathini@linux.ibm.com>
To: Naveen N Rao <naveen@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Song Liu <songliubraving@fb.com>, Jiri Olsa <jolsa@kernel.org>,
Viktor Malik <vmalik@redhat.com>,
live-patching@vger.kernel.org,
Josh Poimboeuf <jpoimboe@kernel.org>,
Joe Lawrence <joe.lawrence@redhat.com>,
Jiri Kosina <jikos@kernel.org>,
linux-trace-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Shung-Hsi Yu <shung-hsi.yu@suse.com>
Subject: Re: [PATCH] powerpc64/bpf: support direct_call on livepatch function
Date: Mon, 6 Oct 2025 18:50:20 +0530 [thread overview]
Message-ID: <17f49a63-eccb-4075-91dd-b1f37aa762c7@linux.ibm.com> (raw)
In-Reply-To: <amwerofvasp7ssmq3zlrjakqj5aygyrgplcqzweno4ef42tiav@uex2ildqjvx2>
On 06/10/25 1:22 pm, Naveen N Rao wrote:
> On Fri, Oct 03, 2025 at 12:57:54AM +0530, Hari Bathini wrote:
>> Today, livepatch takes precedence over direct_call. Instead, save the
>> state and make direct_call before handling livepatch.
>
> If we call into the BPF trampoline first and if we have
> BPF_TRAMP_F_CALL_ORIG set, does this result in the BPF trampoline
> calling the new copy of the live-patched function or the old one?
Naveen, calls the new copy of the live-patched function..
- Hari
next prev parent reply other threads:[~2025-10-06 13:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-02 19:27 [PATCH] powerpc64/bpf: support direct_call on livepatch function Hari Bathini
2025-10-03 11:21 ` kernel test robot
2025-10-06 7:52 ` Naveen N Rao
2025-10-06 13:20 ` Hari Bathini [this message]
2025-10-08 8:13 ` Naveen N Rao
2025-10-09 5:49 ` Hari Bathini
2025-10-09 11:27 ` Naveen N Rao
2025-10-10 7:17 ` Hari Bathini
2025-10-15 6:18 ` Naveen N Rao
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