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Thu, 12 Nov 2026 13:09:16 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.18.47]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 12 Nov 2026 13:09:16 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, chzigotzky@xenosoft.de Cc: sshegde@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, msuchanek@suse.de, ritesh.list@gmail.com, harshpb@linux.ibm.com, gautam@linux.ibm.com, amachhiw@linux.ibm.com, venkat88@linux.ibm.com, nnmlinux@linux.ibm.com, mkchauras@gmail.com Subject: [PATCH v3 0/3] KVM: PPC: BookE: Fix boot hang on preemptible kernels Date: Thu, 12 Nov 2026 18:39:10 +0530 Message-ID: <20261112130913.4124175-1-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.54.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEyMDA1MCBTYWx0ZWRfXyZzywHB4un0M m9wxQECz0fNmX9DwXAipnCuaaUYoVK4mFeDUrFPTJOAf4DczDcJcVUek28q6BDhViEgcBnnexka o42+tH1csSd4dakkrrQ4ot2FAgi5s4w= X-Authority-Analysis: v=2.4 cv=HbCB3SE8 c=1 sm=1 tr=0 ts=6af5ba86 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=TEUKsyddKFnqGGVLVlYA:9 X-Proofpoint-ORIG-GUID: hr7NnMY1O1eU6QKFnmSdsOdh-vKox6yF X-Proofpoint-GUID: Bru0rrrdTpLPq-rbqYWrAZJiCYoaPy8x X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEyMDA1MCBTYWx0ZWRfX2Dqz6ivc/Oc9 you88zDVd2ICI/rRhg0VY+7eO4Yptf4IiHkhHFhtpWxoA80vbolCd30Wn8BqrppvVj9xzILbzMy D8U+WKeEqFAuUI253aHS+Qcf8KHfE+K22IbcEXQM3AOS1xIp7cfh7DCPTEi09boFIlT9P2cye7k Wu8pRID3SyJiAdizSciv48HVg1sfWJb4DPk8w8N4Wc5jpGFzV1MLboOPv51QwIbmVUEkadnQs8w B+fkXACXLOcB5pXE/sItfvyB/QWtDjLuAktt74VltdAOmmL5JFtVlA9TL0HFxHrWXL8yUpSvkTR u75XU1SVJnvsYOrFSdQUdoQmW7RaqBFAJWJv8Qzg3p7CVYgZH/ZqML6VPQ5vUPi/5AKrsTdWY9v yAd90z29uXqOXVSW/cGCq8I/MBQpMDmYza2opT+vuX311Thw9GLOdaM6CE5XKc64Bmie0Cu8s+P 6mS5AVxkbtbWp0UrgwA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-12_01,2026-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 spamscore=0 bulkscore=0 phishscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611120050 Christian Zigotzky had reported that preemptible kernels don't boot on his FSL Cyrus+ board. The board freezes on running either full/lazy preemption and has been an issue for a while now (years!). https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t More details in cover-letter of v2[1] v2->v3: - Comment removal (Mukesh Kumar Chaurasiya) - Add missing booke change (Sashiko) - Collect tags (Thanks to Mukesh Kumar Chaurasiya, Christian Zigotzky) v1->v2: - Re-order to avoid preempt count dance (Narayana Murty N) - Do only hard_irq_disable on PPC64 to avoid second warning. On PPC32 use local_irq_disable to acheive the same. (Ritesh Harjani) v2: https://lore.kernel.org/all/20261110053238.3794500-1-sshegde@linux.ibm.com/#t [1] Apologies in case any nitpicks are missed. I'm surviving on half a night's sleep these days. As said in v2, remaining usecases of hard_irq_disable will be taken up later. Shrikanth Hegde (3): powerpc/irq: Add ppc_hard_irq_disable() KVM: PPC: BookE: Load FP and Altivec before enabling the interrupts KVM: PPC: Use ppc_hard_irq_disable before guest entry arch/powerpc/include/asm/hw_irq.h | 17 +++++++++++++++++ arch/powerpc/kvm/booke.c | 6 ++---- arch/powerpc/kvm/powerpc.c | 14 +++----------- 3 files changed, 22 insertions(+), 15 deletions(-) -- 2.52.0