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Date: Mon, 14 Feb 2022 16:17:00 +0530
From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/3] powerpc64/bpf: Add support for BPF Trampolines
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>
References: <cover.1644216043.git.naveen.n.rao@linux.vnet.ibm.com>
 <918b842d-f674-bbdb-c772-b43a00f1b155@csgroup.eu>
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Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
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Christophe Leroy wrote:
>=20
>=20
> Le 07/02/2022 =C3=A0 08:07, Naveen N. Rao a =C3=A9crit=C2=A0:
>> 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.
>>=20
>> 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.
>=20
> 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=20
on elf v1, since we don't have DYNAMIC_FTRACE_WITH_REGS supported there.=20
We should be able to get this working on ppc32 though.


- Naveen


From mboxrd@z Thu Jan  1 00:00:00 1970
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Date:   Mon, 14 Feb 2022 16:17:00 +0530
From:   "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/3] powerpc64/bpf: Add support for BPF Trampolines
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:     "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
        Hari Bathini <hbathini@linux.ibm.com>,
        Jordan Niethe <jniethe5@gmail.com>,
        Jiri Olsa <jolsa@redhat.com>,
        "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
        Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
References: <cover.1644216043.git.naveen.n.rao@linux.vnet.ibm.com>
        <918b842d-f674-bbdb-c772-b43a00f1b155@csgroup.eu>
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Christophe Leroy wrote:
>=20
>=20
> Le 07/02/2022 =C3=A0 08:07, Naveen N. Rao a =C3=A9crit=C2=A0:
>> 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.
>>=20
>> 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.
>=20
> 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=20
on elf v1, since we don't have DYNAMIC_FTRACE_WITH_REGS supported there.=20
We should be able to get this working on ppc32 though.


- Naveen