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<8a8fdd2d-b29b-4aa2-b9eb-66fd10bd476c@linux.ibm.com> Date: Tue, 8 Sep 2026 22:03:52 +0530 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 8/8] selftests/bpf: Add tailcall verifier selftest for powerpc64 To: Saket Kumar Bhaskar , bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: hbathini@linux.ibm.com, maddy@linux.ibm.com, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, shuah@kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org, venkat88@linux.ibm.com, yeswanth@linux.ibm.com References: Content-Language: en-US From: R Nageswara Sastry In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Yf6a0WeLqNgGDzkSi7S5VPgr6VHdyJb_ X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA4MDE3OCBTYWx0ZWRfX3A2BWzidwS+n 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Yf6a0WeLqNgGDzkSi7S5VPgr6VHdyJb_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-08_03,2026-09-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609080178 On 31.08.2026 12:46 PM, Saket Kumar Bhaskar wrote: > From: Abhishek Dubey > > Verifier testcase result for tailcalls: > > # ./test_progs -t verifier_tailcall > > #618/1 verifier_tailcall/invalid map type for tail call:OK > > #618/2 verifier_tailcall/invalid map type for tail call @unpriv:OK > > #618 verifier_tailcall:OK > > #619/1 verifier_tailcall_jit/main:OK > > #619 verifier_tailcall_jit:OK > > Summary: 2/3 PASSED, 0 SKIPPED, 0 FAILED > > Signed-off-by: Abhishek Dubey > Signed-off-by: Saket Kumar Bhaskar > Tested-by: Yeswanth Krishna Tellakula Tested-by: R Nageswara Sastry System: ppc64le LPAR (IBM POWER), Linux 7.3-rc2 > --- > .../bpf/progs/verifier_tailcall_jit.c | 78 +++++++++++++++++++ > 1 file changed, 78 insertions(+) > > diff --git a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c > index 48fa34d2959f..9880ce4f1931 100644 > --- a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c > +++ b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c > @@ -91,6 +91,84 @@ __jited(" popq %rax") > __jited(" jmp {{.*}}") /* jump to tail call tgt */ > __jited("L0: leave") > __jited(" {{(retq|jmp 0x)}}") /* return or jump to rethunk */ > +__arch_powerpc64 > +/* program entry for main(), regular function prologue */ > +__jited(" nop") > +__jited("...") /* ld 2, 16(13) absent with CONFIG_PPC_KERNEL_PCREL */ > +__jited(" li 9, 0") > +__jited(" std 9, -8(1)") > +__jited(" mflr 0") > +__jited(" std 0, 16(1)") > +__jited(" stdu 1, {{.*}}(1)") > +/* > + * load address and call sub() via count register > + * > + * Address materialization differs between PCREL and non-PCREL kernels. > + * Skip the address generation sequence and verify only that the call > + * target is loaded into CTR before branching. > + */ > +__jited("...") > +__jited("...") > +__jited("...") > +__jited("...") > +__jited("...") > +__jited("...") > +__jited(" mtctr {{.*}}") > +__jited("...") > +__jited(" bctrl") > +__jited(" mr 8, 3") > +__jited(" li 8, 0") > +__jited(" addi 1, 1, {{.*}}") > +__jited(" ld 0, 16(1)") > +__jited(" mtlr 0") > +__jited(" mr 3, 8") > +__jited(" blr") > +__jited("...") > +__jited("func #1") > +/* subprogram entry for sub() */ > +__jited(" nop") > +__jited("...") /* ld 2, 16(13) absent with CONFIG_PPC_KERNEL_PCREL */ > +/* tail call prologue for subprogram */ > +__jited(" ld 10, 0(1)") > +__jited(" ld 9, -8(10)") > +__jited(" cmpldi 9, 33") > +__jited(" bt {{.*}}, {{.*}}") > +__jited(" addi 9, 10, -8") > +__jited(" std 9, -8(1)") > +__jited(" lis {{.*}}, {{.*}}") > +__jited(" sldi {{.*}}, {{.*}}, 32") > +__jited(" oris {{.*}}, {{.*}}, {{.*}}") > +__jited(" ori {{.*}}, {{.*}}, {{.*}}") > +__jited(" li {{.*}}, 0") > +__jited(" lwz 9, {{.*}}({{.*}})") > +__jited(" slwi {{.*}}, {{.*}}, 0") > +__jited(" cmplw {{.*}}, 9") > +__jited(" bf 0, {{.*}}") > +/* bpf_tail_call implementation */ > +__jited(" ld 9, -8(1)") > +__jited(" cmpldi 9, 33") > +__jited(" bf {{.*}}, {{.*}}") > +__jited(" ld 9, 0(9)") > +__jited(" cmpldi 9, 33") > +__jited(" bt {{.*}}, {{.*}}") > +__jited(" addi 9, 9, 1") > +__jited(" mulli 10, {{.*}}, 8") > +__jited(" add 10, 10, {{.*}}") > +__jited(" ld 10, {{.*}}(10)") > +__jited(" cmpldi 10, 0") > +__jited(" bt {{.*}}, {{.*}}") > +__jited(" ld 10, {{.*}}(10)") > +__jited(" addi 10, 10, {{.*}}") /* offset depends on CONFIG_PPC_KERNEL_PCREL */ > +__jited(" mtctr 10") > +__jited(" ld 10, -8(1)") > +__jited(" cmpldi 10, 33") > +__jited(" bt {{.*}}, {{.*}}") > +__jited(" addi 10, 1, -8") > +__jited(" std 9, 0(10)") > +__jited(" bctr") > +__jited(" mr 3, 8") > +__jited(" blr") > + > SEC("tc") > __naked int main(void) > { -- Thanks and Regards R.Nageswara Sastry