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Fri, 03 Jul 2026 23:43:43 -0700 (PDT) X-Received: by 2002:a05:620a:3728:b0:915:675d:a2d with SMTP id af79cd13be357-92e9a4caaf5mr344599085a.51.1783147422733; Fri, 03 Jul 2026 23:43:42 -0700 (PDT) Received: from [10.111.130.138] ([212.136.9.21]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c12b62f5c41sm377843266b.59.2026.07.03.23.43.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Jul 2026 23:43:41 -0700 (PDT) Message-ID: <4b7fe7e6-2531-4d26-9085-43f40a2ce2e0@oss.qualcomm.com> Date: Sat, 4 Jul 2026 08:43:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] arm64: Disallow disabling boot CPU based on config To: Sudeep Holla , Sneh Mankad Cc: Thomas Gleixner , Peter Zijlstra , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Catalin Marinas , Mark Rutland , Lorenzo Pieralisi , Will Deacon , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20260703-disable_boot_cpu_offline-v2-1-782d16ff58c3@oss.qualcomm.com> <20260703-competent-adaptable-coot-f8daaf@sudeepholla> Content-Language: en-US From: Daniel Lezcano In-Reply-To: <20260703-competent-adaptable-coot-f8daaf@sudeepholla> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA0MDA2MyBTYWx0ZWRfXyObaYZ10e52K 5vVr1+a8OsWJzqexydU2BiRygc7fTAemBX4zvDo8GFA/Lx8Vxy7hIcSkGKnVZhYEWVmwKxiUeMf /lE4oSuOfospGJmeV3mSB+GgdXFI7SQ= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA0MDA2MyBTYWx0ZWRfX3tleG1adX34r uATxNh0zsV0wsWP0/IUnXNRy7CIk3hoQ5+Tqp9FF9FENAAFmWsoB5HZ5mPRN+drmDf5r1ll+w5R 6DTPxQr25IJo9RtYXbnBOgNygiAKvNwC6l+uh9yawPd+R99GSmF+Rfrm9VzOHvjcCFRFOK6QWp4 yfVUrO+b4rKLY9sx0jcx5bRoLyZbCGu1XbHM98BXNNA1dc5KtH1WZbJW5Q+l4ReBiifXaEpBiw8 1RjAY2QfODAu3A0oZrPNZ6++hlBh3iLDZdKyahscGdXJVAXO1sXIlx03rv16lbVTcE8Ot40vQ36 4zXPZ5wKMh/OITUZdtbAA72EO/g3FPMEONNkNBBSkQESzRjH/1h9r+juMiAbCZfZ/X+NNvBHLgG ei9sFVdQ0M8o2uw2bUTakD2tDFWONkFkOPVOmAmtz8LNjclvr3uwQFTLF26LGXJFeY7zC3cMLer vxXpm64nMw/a4vF47gw== X-Proofpoint-GUID: i2vC7aIChRF7PWMmLGO7wJU4rNazydIC X-Proofpoint-ORIG-GUID: i2vC7aIChRF7PWMmLGO7wJU4rNazydIC X-Authority-Analysis: v=2.4 cv=b9GCJNGx c=1 sm=1 tr=0 ts=6a48aba0 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=/bviTfK1dmy+WGcHzWQ0gg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=HAiw8MWB_luJwFoROhsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 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=2026-07-04_01,2026-07-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 phishscore=0 malwarescore=0 adultscore=0 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607040063 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260703_234346_269551_717DFF5C X-CRM114-Status: GOOD ( 16.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Sudeep, Le 03/07/2026 à 17:51, Sudeep Holla a écrit : > (It is always good to cc all PSCI maintainer for any ARM64 CPU > hotpug/suspend related changes) > > On Fri, Jul 03, 2026 at 04:50:02PM +0530, Sneh Mankad wrote: >> The Qualcomm SoCs like LeMans, Monaco support suspend to ram which leads >> the SoC to ACPI S3 similar state where SoC is turned off and DDR is >> retained. The hardware design on these SoCs forces a constraint to suspend >> and resume the system on boot CPU / CPU0. >> > And you fail to explain why they have that constraint. > > Is it because some secure context is not allowed to migrate ? > > We already have a mechanism for that in place and this hack is not at all > required. Do you mean a mechanism for the secure context or for preventing CPU0 ? Can you clarify ?