Re: [RFC PATCH 0/3] powerpc64/bpf: Add support for BPF Trampolines

From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Steven Rostedt <rostedt@goodmis.org>
Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
	Jordan Niethe <jniethe5@gmail.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Hari Bathini <hbathini@linux.ibm.com>
Subject: Re: [RFC PATCH 0/3] powerpc64/bpf: Add support for BPF Trampolines
Date: Mon, 14 Feb 2022 16:17:00 +0530	[thread overview]
Message-ID: <1644835471.mm5694ds8t.naveen@linux.ibm.com> (raw)
In-Reply-To: <918b842d-f674-bbdb-c772-b43a00f1b155@csgroup.eu>

Christophe Leroy wrote:
> 
> 
> Le 07/02/2022 à 08:07, Naveen N. Rao a écrit :
>> This is an early RFC series that adds support for BPF Trampolines on
>> powerpc64. Some of the selftests are passing for me, but this needs more
>> testing and I've likely missed a few things as well. A review of the
>> patches and feedback about the overall approach will be great.
>> 
>> This series depends on some of the other BPF JIT fixes and enhancements
>> posted previously, as well as on ftrace direct enablement on powerpc
>> which has also been posted in the past.
> 
> Is there any reason to limit this to powerpc64 ?

I have limited this to elf v2, and we won't be able to get this working 
on elf v1, since we don't have DYNAMIC_FTRACE_WITH_REGS supported there. 
We should be able to get this working on ppc32 though.

- Naveen