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Fri, 19 Jun 2026 22:00:11 +0000 (GMT) Received: from Linuxdev (unknown [9.43.77.5]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 19 Jun 2026 22:00:11 +0000 (GMT) From: Madhavan Srinivasan To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Saket Kumar Bhaskar Cc: hbathini@linux.ibm.com, sachinpb@linux.ibm.com, venkat88@linux.ibm.com, andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, chleroy@kernel.org, mpe@ellerman.id.au Subject: Re: [PATCH v3] powerpc64/bpf: Add powerpc64 JIT support for timed may_goto Date: Sat, 20 Jun 2026 03:29:52 +0530 Message-ID: <178190618787.653308.8944417251993496249.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260403105016.74775-1-skb99@linux.ibm.com> References: <20260403105016.74775-1-skb99@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX6pm6MLiMiXth F9MJBBjkgMZPm1E3VDVKzVvdlOCgoK/7LqNiAkguLvKqZwiWkFTYxKi5Gc0PyU7ajkAzmBTRRJA F53+ZtzG9YrvKDFC+B64LypSLUVUEng= X-Proofpoint-GUID: QnzBP-CKFwzx4-ZDOKoScJQDS6xC6vN8 X-Authority-Analysis: v=2.4 cv=bMgm5v+Z c=1 sm=1 tr=0 ts=6a35bbf5 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=wfb-qDaINPFKIjLEY4oA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: 4pYGxRfDI7dfBn_bQLyDjXW6yPNzbEKz X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX6yMMTmPobo5q F/0sklDVI+q3cHKan5JPo2JPhXh2bZmLNlhvA6n73mzfLkYt5KQhJ688BjIbhNgcNfD+syhmgF9 RD3AZKCfRlwoG0pf+M3zxANkkuP14Rk9XoXp1VY25PWKxyOgC/6Hoc42uDTup3hXaBSpZi0BQha dDNRqwbYVxvZGYsqHVNvr+l27Au4p/iMP23KV40jtr5Z/JMUG5hwNWh5Lt6cQdLUIjxUYDCV6B6 llN69vM0Oq6NcbIdzDRkuizOvBP09PfLVWOPNC2o/bSzM94/XMNEjpIMnirkT32g4tVYQcpiiYu KDe1D+duM/dAuJQTHiVHhZR1wCQkemsJJ0/MHIlp60YMYfUGIHH88sKvQhZYPjDzdvW+LhccQYc XZb4YceHLGbyqd0z/UiBTiJJ1nwfkizODeu16Pf+pixsithO8Q/iQpdKN/0vKzv8gyw6PqEyKjQ 7ATli5rBrg21IGRqNVg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-19_05,2026-06-18_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 adultscore=0 spamscore=0 bulkscore=0 priorityscore=1501 phishscore=0 clxscore=1011 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606190210 On Fri, 03 Apr 2026 16:20:16 +0530, Saket Kumar Bhaskar wrote: > When verifier sees a timed may_goto instruction, it emits a call to > arch_bpf_timed_may_goto() with a stack offset in BPF_REG_AX > (powerpc64 R12) and expects the refreshed count value to be returned > in the same register. The verifier doesn't save or restore any registers > before emitting this call. > > arch_bpf_timed_may_goto() should act as a trampoline to call > bpf_check_timed_may_goto() with powerpc64 ELF ABI calling convention. > > [...] Applied to powerpc/next. [1/1] powerpc64/bpf: Add powerpc64 JIT support for timed may_goto https://git.kernel.org/powerpc/c/b55b6b9ad76cdb82123c62a15c6a4ebe4abb8bfa cheers