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Tue, 31 Mar 2026 10:38:18 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 62VAcE0M56754518 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 31 Mar 2026 10:38:14 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 690152004D; Tue, 31 Mar 2026 10:38:14 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2BF0320043; Tue, 31 Mar 2026 10:38:13 +0000 (GMT) Received: from [9.78.106.17] (unknown [9.78.106.17]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 31 Mar 2026 10:38:13 +0000 (GMT) Message-ID: <2fa9bd2a-6cee-4c59-a66d-049e503cea71@linux.ibm.com> Date: Tue, 31 Mar 2026 16:08:12 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] powerpc64/bpf: Add support for instruction array To: adubey@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, maddy@linux.ibm.com References: <20260227014315.39980-1-adubey@linux.ibm.com> <20260227014315.39980-2-adubey@linux.ibm.com> Content-Language: en-US From: Hari Bathini In-Reply-To: <20260227014315.39980-2-adubey@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Fdo6BZ+6 c=1 sm=1 tr=0 ts=69cba41b cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=LiiZRlpjulW5djIf0KoA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: 3vPS9-C3mv6Radad6FzExNAHTb7uM26i X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzMxMDA5OSBTYWx0ZWRfX2ifHvXnBtOez j8I5lcv+qftHAmK71RdmaUYrc8CWsz107F4OF1SXyCtpK3C1sUOroQvkG+zYFXe3q/fitfYap/s ZThB0CjnnlyFcRxepL/0SR3aUB+4h4YgN6Gn4nYLZ47iW3cBuIoLCezFoYtfFIHj8IFfLI+2Ij0 Od+otaYHZtb0vI+sFeUeA2OZDq8ID9MgLgOwGsMypOw1Wuylwl1OYffXqYrWAKMTfAfDHuJIiQl 4Xsk2m7TvVtyvpmzY/W8oo6cTotllH09L5o2BYDFw7gFSncsR40rB87LBI4d/BNAw+6U3lLxMse jP1/W01pDH5W0HyILXWCmTvUxNBewmwTipG/y9oYpxepFsqJGNTt+S6eNl2BlidkNMwNKPlKSTn BlEp+dL4RcTu52gKXxNOjUaBnyi5C7o7Lk8wv2cyuH1nosqPw7ecPyHBwEGhDFn2FXNQ5aFsV/+ BQOyf6Z5HSFk0MEPdlw== X-Proofpoint-GUID: 3vPS9-C3mv6Radad6FzExNAHTb7uM26i 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=2026-03-31_02,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 bulkscore=0 suspectscore=0 priorityscore=1501 adultscore=0 malwarescore=0 phishscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603310099 On 27/02/26 7:13 am, adubey@linux.ibm.com wrote: > 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") > Looks good to me. Except for a minor nit below.. Acked-by: Hari Bathini > Signed-off-by: Abhishek Dubey > --- > arch/powerpc/net/bpf_jit_comp.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c > index 9ec5ab9b020e..620667c3400b 100644 > --- a/arch/powerpc/net/bpf_jit_comp.c > +++ b/arch/powerpc/net/bpf_jit_comp.c > @@ -373,6 +373,16 @@ 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. > + */ > +#ifdef CONFIG_PPC64_ELF_ABI_V1 > + bpf_prog_update_insn_ptrs(fp, addrs, > + (void *)fimage + FUNCTION_DESCR_SIZE); > +#else > + bpf_prog_update_insn_ptrs(fp, addrs, fimage); > +#endif You don't need this ifdeffery as FUNCTION_DESCR_SIZE is already defined based on this CONFIG option. - Hari