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Date:   Fri, 24 May 2019 22:37:29 +0100
From:   Jiong Wang <>
To:     Alexei Starovoitov <>
Subject: Re: [PATCH v8 bpf-next 05/16] bpf: introduce new bpf prog load flags

On 24/05/2019 21:43, Alexei Starovoitov wrote:
> On Fri, May 24, 2019 at 12:35:15PM +0100, Jiong Wang wrote:
>> x86_64 and AArch64 perhaps are two arches that running bpf testsuite
>> frequently, however the zero extension insertion pass is not enabled for
>> them because of their hardware support.
>> It is critical to guarantee the pass correction as it is supposed to be
>> enabled at default for a couple of other arches, for example PowerPC,
>> SPARC, arm, NFP etc. Therefore, it would be very useful if there is a way
>> to test this pass on for example x86_64.
>> The test methodology employed by this set is "poisoning" useless bits. High
>> 32-bit of a definition is randomized if it is identified as not used by any
>> later insn. Such randomization is only enabled under testing mode which is
>> gated by the new bpf prog load flags "BPF_F_TEST_RND_HI32".
>> Suggested-by: Alexei Starovoitov <>
>> Signed-off-by: Jiong Wang <>
>> ---
>>   include/uapi/linux/bpf.h       | 18 ++++++++++++++++++
>>   kernel/bpf/syscall.c           |  4 +++-
>>   tools/include/uapi/linux/bpf.h | 18 ++++++++++++++++++
>>   3 files changed, 39 insertions(+), 1 deletion(-)
> one more nit:
> could you please split this patch into two?
> Our mostly automatic sync of kernel/libbpf into github/libbpf will fail
> when tools/../bpf.h is not a separate commit.

OK, will do shortly.


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