From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=148.163.156.1 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794064279; b=TB8fCLnF72ITb9w2kte5JfHyYalOvhEBj0KcU36WSwgMbVPwwrBCGXewAsArizv4onmf XYCCuO6J8tcSzuU+pULT/SspgGn0/aIJiCxTqrY0PbGwl8xqBfoPDKO5mV+O2hxl3cNar +F9WbRkjpjFFLFKpY37g4i6ZDU0uCzLukjumJSY+IJUFPAdUVvKWhX0/UVj7Btp1k1Nvt K9987UTc8NGGXpe0gYx4mOQ3OVgVUaneEc1T4s9Z1sNkhIOWIVK7R8+oM9JI9m3TgMxFq d1Gfgwy/vtnmn4z9bck0+9U+/fZ5CBeqGFVsFgIE38BAcrf2jbkCAQQ40Z3amO9b+6Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794064279; h=DMARC-Filter:Received:DKIM-Signature:Received:Received:Received: Received:Received:Received:Received:Message-ID:Date:MIME-Version: User-Agent:Subject:To:Cc:References:Content-Language:From:In-Reply-To: Content-Type:Content-Transfer-Encoding:X-TM-AS-GCONF: X-Proofpoint-Reinject:X-Proofpoint-ORIG-GUID:X-Authority-Analysis: X-Proofpoint-GUID:X-Proofpoint-Spam-Details-Enc: X-Proofpoint-Spam-Info:X-Proofpoint-Virus-Version: X-Proofpoint-Spam-Details; bh=LrJ821n4aqzgpo5xnB92QQehLQuyuvpOQZcpPG/IMH8=; b=IVk7QR0rD6XkYqpgwWjHTIQfOQgQ3794UhloJOhkIRij28pmOuhgqdybWZA21r9iAJIH NwnEyauiLV34IpQDJmYlZq51lBhGbyRMTNfA9YpGsKGrgwE85mAf7mHNsivDXuODVZpYN zC8hgL6lmIIU6ydLoI78sEdMdLC7XCuUNGguihZYvYQXxwjTtOd5MyMufcqUxXgxG+7eG QeKzwtavduJJAzNdb97ltHapFpMSVhXU3dG6JqfHRI+NEgsYWGE5CXcIIX2e4qofn1As8 g1H7/yQ63eK4VIY+nAvwyE0tUmYXv8BXBHnIv/vK+IaQN/nKXdo6vyscXjZ9eL8TMNA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=J5wvC0kA; arc=none smtp.remote-ip=148.163.156.1 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 524DE606A9DE for ; Sat, 7 Nov 2026 15:11:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 524DE606A9DE Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=J5wvC0kA Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 6A7CECIN1710169; Sat, 7 Nov 2026 15:11:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=LrJ821 n4aqzgpo5xnB92QQehLQuyuvpOQZcpPG/IMH8=; b=J5wvC0kAcK0X9fE9PDnLeX UhQQSlYKzjitMMiYG+BXIlnp/PEQZjD00oWo23+wyCDKaabCAYLTzaBVAOjV5cRu HQAQmhQ2D68/ENGlQ/fptwSibtoicSnougFAgHSTL+2Bp+GFPQrxAXAQvM4nXX9Y 3xpDCkTWDpgMapI5FTPmOtLZH7W7bjc7pu36AB6vUdAS2xQfZNNmwjXTKPVRlTRM SgRo2KB3xbrx1BO3l/YXlUGT3R7HGxI3jhCt5Kghdgknl4JBzJpnCAn440lTC/NW AHtbk0bTKlPmGGACNy8cG64hfKHqSPj/BOP5ZECSE/a1K6F3WNrderot6A65AIRw == Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4hsug5jn17-1 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Sat, 07 Nov 2026 15:11:00 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.11/8.18.1.11) with ESMTP id 6A7F56Si1086609; Sat, 7 Nov 2026 15:10:59 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4hswppj305-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 07 Nov 2026 15:10:58 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6A7FAsax52232604 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 7 Nov 2026 15:10:55 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DA1412004E; Sat, 7 Nov 2026 15:10:54 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C5BC020040; Sat, 7 Nov 2026 15:10:51 +0000 (GMT) Received: from [9.39.28.191] (unknown [9.39.28.191]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Sat, 7 Nov 2026 15:10:51 +0000 (GMT) Message-ID: <3d6722a2-688b-4829-b015-c15c03838c47@linux.ibm.com> Date: Sat, 7 Nov 2026 20:40:50 +0530 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] KVM: PPC: BookE: Fix boot hang on preemptible kernels To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, chzigotzky@xenosoft.de Cc: 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 References: <20260928110411.844582-1-sshegde@linux.ibm.com> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: <20260928110411.844582-1-sshegde@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: TiLWMMM_PkRDynKR8b8pz-lHL4BKbpqG X-Authority-Analysis: v=2.4 cv=PeVqFShd c=1 sm=1 tr=0 ts=6aef3f84 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=tAcHNJzwEHiiyL2kpDMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: f85d2Sjoe9ihTO0_OUSj3gE0sAtXjGR8 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA3MDA1OCBTYWx0ZWRfX6nuIgrWgcMy3 O0Mgzx3jDcwQxDDRT7el7aNM8Z0uhDlIBLwYZuNzZchZSF5wiDgWEaegJa8C/On9uzvwJCi/GIM HrXXqE6ZWf0e3825Z4/fJb8ZoIxvPxRWqiNiSBmeqqxiLzxvRMmkln6jCBEnyApZwlzDCM7RnMu enIweON24DGVYX3T3BrC9pCYifyh+VeiBvbHWvsZk70fUy+taLtRtNwwKl/k4Q/70UaDU40QviX zZiQtycHjZ0nRUFH4yQCmxgNN5ShhLJJVQ34ha2aWhjmbccrcLW1P3LGktM0aD27HiBVyOzNoLE FDnSvgPas8g3IsHCC09ZKPUvf4hVkbZCGWX8Yd43uAT7o+g0gw4l0nF4aSPawQONKu8Ky/csgO+ VPT/yBcDzO+85Q5HyUuH9El5P/ONy6ZHIeEYmZIEs0FG7byes6th/SnCHNvfe/U/k5YbObyqgMb 9HBeW6WmbSsWqWR19FA== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA3MDA1OCBTYWx0ZWRfXw3+IL1wYDnyF haqiangTFkETZEsEwc664X0DIBTV4oFvoJg74K1TNUjwmJjRVSxi1YIJFXyg0cfNv1LKBh7MCAW xCUQAWM50d/OpqY5o34uJIxeNPqeKCY= 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=2026-11-07_04,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 malwarescore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611070058 Hi. On 9/28/26 4:34 PM, Shrikanth Hegde wrote: > 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. > > https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t > > After 7.0, there is only preempt=full/lazy which removed the > preempt=none/voluntary workaround used to mask the issue. There was > challenge is getting the console logs which made the fixes difficult since > one couldn't know where the issue is. > > Thanks to Michal for helping in getting the logs. That pointed at few > places where the issue could be. This series is an attempt at fixing > those. > > Christian, KVM team, > Please *test* the patches. > > Shrikanth Hegde (2): > KVM: PPC: BookE: Disable preemption before loading guest FP and > Altivec > KVM: PPC: Replay pending interrupts before entering the guest > > arch/powerpc/kvm/booke.c | 9 ++++++++- > arch/powerpc/kvm/powerpc.c | 13 +++++++++++++ > 2 files changed, 21 insertions(+), 1 deletion(-) > All the suggested changes makes sense. I will plan to send out version soon. Hopefully mid next week. 1. Re-order in below way. kvmppc_load_guest_fp(vcpu); kvmppc_load_guest_altivec(vcpu); kvmppc_fix_ee_before_entry(); 2. Define a common helper. I am thinking to name it as ppc_hard_irq_disable(). Since suggestion was also to be used in the entry code. Other names i could think of are local_hard_irq_disable, arch_hard_irq_disable, local_irq_disable_hard.