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Wed, 1 Apr 2026 11:21:18 +0000 (GMT) From: adubey@linux.ibm.com To: linuxppc-dev@lists.ozlabs.org Cc: hbathini@linux.ibm.com, bpf@vger.kernel.org, maddy@linux.ibm.com, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, shuah@kernel.org, linux-kselftest@vger.kernel.org, Abhishek Dubey Subject: [PATCH v3 1/4] powerpc/bpf: Add support for instruction array Date: Wed, 1 Apr 2026 11:21:30 -0400 Message-ID: <20260401152133.42544-2-adubey@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260401152133.42544-1-adubey@linux.ibm.com> References: <20260401152133.42544-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 02IQjd_29Lu66KduikJlQsx7Ysk3_nts X-Authority-Analysis: v=2.4 cv=KslAGGWN c=1 sm=1 tr=0 ts=69ccffb5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=6tkAVXMqj22fOBSrVA8A:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAxMDEwMyBTYWx0ZWRfX/woH+zO7pPzu Awe+/Peb1bmdH4E0a5XD1EN2qXUVTALCwdh0znvc6+uoiLj7VrVrayyz3Czyg8B/QPylnyjZZ75 h+IJUPGZu37M2mkQS5BX4To3FKNwwgGvgvZ4/CtM/aOWjevO4+ZBQvxp1VoD0cKTnV6hQchxyIs mdn3t4qJqNyuLruYdKKmGawepJlXUuU/428PzTpaQ+AqKZsV9K+2sGcRk8iQlR1PpXWl5OQOD6r wJ6C69+HZsxTmUnMLpmKjOEgpOhJYy9Bnzb/xYrgVj9pZgav6qWR0AKQfIuAC4zwihN2aC7nRn7 8bxyKzKY3D5Wqi5wIVZpqZCOR93ioA6A+bBkCGTAAj7hwsOpFTSUhnXFFFj66nJKuVADXX265wh RN8sPFAchcvUr6ZPj4DfMEMSVgTL1pyEBHNT8RIYAFK4FGdFLo/PrtF/BHTxhFODG/WiXfNx1bh RQ+/StVfeI0uht5qVJg== X-Proofpoint-ORIG-GUID: 02IQjd_29Lu66KduikJlQsx7Ysk3_nts X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-01_03,2026-04-01_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604010103 From: Abhishek Dubey On loading the BPF program, the verifier might adjust/omit some instructions. The adjusted instruction offset is accounted in the map containing original instruction -> xlated mapping. This patch add ppc64 JIT support to additionally build the xlated->jitted mapping for every instruction present in instruction array. This change is needed to enable support for indirect jumps, added in a subsequent patch. Invoke bpf_prog_update_insn_ptrs() with offset pair of xlated_offset and jited_offset. The offset mapping is already available, which is being used for bpf_prog_fill_jited_linfo() and can be directly used for bpf_prog_update_insn_ptrs() as well. Additional details present at: commit b4ce5923e780 ("bpf, x86: add new map type: instructions array") Signed-off-by: Abhishek Dubey Acked-by: Hari Bathini --- arch/powerpc/net/bpf_jit_comp.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index b2fdf8ff9c60..50103b3794fb 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -373,6 +373,13 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp) goto out_addrs; } bpf_prog_fill_jited_linfo(fp, addrs); + /* + * On ABI V1, executable code starts after the function + * descriptor, so adjust base accordingly. + */ + bpf_prog_update_insn_ptrs(fp, addrs, + (void *)fimage + FUNCTION_DESCR_SIZE); + out_addrs: if (!image && priv_stack_ptr) { fp->aux->priv_stack_ptr = NULL; -- 2.52.0