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([2601:647:6881:9060:c5c1:2e33:6cf2:beed]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-77e5fe6de75sm407542b3a.19.2025.09.18.15.26.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Sep 2025 15:26:28 -0700 (PDT) From: Cong Wang To: linux-kernel@vger.kernel.org Cc: pasha.tatashin@soleen.com, Cong Wang , Andrew Morton , Baoquan He , Alexander Graf , Mike Rapoport , Changyuan Lyu , kexec@lists.infradead.org, linux-mm@kvack.org Subject: [RFC Patch 5/7] x86: Introduce arch_cpu_physical_id() to obtain physical CPU ID Date: Thu, 18 Sep 2025 15:26:04 -0700 Message-Id: <20250918222607.186488-6-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250918222607.186488-1-xiyou.wangcong@gmail.com> References: <20250918222607.186488-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: usmske7co8zotiwhjs4atw5aqkm11ega X-Rspam-User: X-Rspamd-Queue-Id: 5F667120008 X-Rspamd-Server: rspam10 X-HE-Tag: 1758234390-845882 X-HE-Meta: U2FsdGVkX19WB6riTuZusUTf6NzXHYhQl4AtaNggif9nRhcqZvxN329N+fuzy6e+G+pY6ddQz/1E/xCmi3gRdJf4kn4utQLaL+32bmf/iSDEistU8YC1MMsyAt8LtPbc3Z2tWmEL/Mo5NM7CQbCsA6MnQQXN+O05aDyvVu/o9lMrIHd4Hgu0gbIa0FR/PyaBBhTYOFhttJ5eKT6Ts2kZ5N2C1151UCkRVxmAt9QM9pqngluvycrLvj8ZWnsdiZ+mpM0CWPPNIUS48yptcU/HKZBq3pThvkpjfV7JUJlhOTN1SLh+MrcTd81kruXQp3GqBBr2dS5QQeL6fwQLi3jUBmeWvVW48YD2Htk8pCRxN6Atu37TfmKW9rkZ5R5tJvEyb71H+j5idRMY/SNhxc0nZzMvpZfT56vSYHJiOKf+kg/6AF/NDdJTUpdHGivlEPJqBiAt+Y8K+kDAnaQ5yTZG2XVO2im6IvJi3Z7MH+Vz8TIQYZf9xmL62h2Ak6inwTtJqLTcu2wmspUL3Tc81Jx4J41oLzQvitvMWQFSx6s4ir62sOsovrfdmWFobauLKxsEkKbBdNj2WlMeLs+Icdt5MfB8igmQiCqw0mPPlAruHL5q7UQxuX88kYCgLGwRXVwO5m3DxEZe8+dh5mYp7N8Xv7ihm0VR0TYUbUT2emHYmlL838pi5tcKqv0Kd3CTDJfSnM1ZgNBeXVY1gjJdeHNcYUrhmahBjnceU7R0qcgy5g4aSD4febSY5Z4PsIutQqCh6emr5ABI+GzlioLmL+/SPspXo+M2Ki0+x1tFsvhqDGTd0oDgKlEIq4FN9RRKHKfnR4/jez8SZwy1N4gDD1bQks5lqXn8bEs958h+jKjodvHWERQjuyLVO/ktrQHjRtg00dwnzkFeHzDY1xhKuEkAEpFb6NVVhtJ2lYnG/owpw8VG1bwSCa/0NSG6ptx0YmhPykUCQIsCrVELC4kl98A /OiOUGe7 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Cong Wang The tranditional smp_processor_id() is a software-defined CPU ID which is only unique within the same kernel. With Multikernel architecture, we run multiple Linux kernels on different CPU's, hence the host kernel needs a globally unique CPU ID to manage the CPU's. The physical CPU ID is perfect for this case. This API will be used to globally distinguish CPU's among different multikernels. Signed-off-by: Cong Wang --- arch/x86/include/asm/smp.h | 6 ++++++ arch/x86/kernel/smp.c | 6 ++++++ kernel/multikernel.c | 9 +++++---- 3 files changed, 17 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 1a59fd0de759..378be65ceafa 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -40,6 +40,7 @@ struct smp_ops { void (*send_call_func_ipi)(const struct cpumask *mask); void (*send_call_func_single_ipi)(int cpu); + int (*cpu_physical_id)(int cpu); }; /* Globals due to paravirt */ @@ -100,6 +101,11 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) smp_ops.send_call_func_ipi(mask); } +static inline int arch_cpu_physical_id(int cpu) +{ + return smp_ops.cpu_physical_id(cpu); +} + void cpu_disable_common(void); void native_smp_prepare_boot_cpu(void); void smp_prepare_cpus_common(void); diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 3ee515e32383..face9f80e05c 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -289,6 +289,11 @@ static int __init nonmi_ipi_setup(char *str) __setup("nonmi_ipi", nonmi_ipi_setup); +static int native_cpu_physical_id(int cpu) +{ + return cpu_physical_id(cpu); +} + struct smp_ops smp_ops = { .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu, .smp_prepare_cpus = native_smp_prepare_cpus, @@ -306,6 +311,7 @@ struct smp_ops smp_ops = { .send_call_func_ipi = native_send_call_func_ipi, .send_call_func_single_ipi = native_send_call_func_single_ipi, + .cpu_physical_id = native_cpu_physical_id, }; EXPORT_SYMBOL_GPL(smp_ops); diff --git a/kernel/multikernel.c b/kernel/multikernel.c index 74e2f84b7914..7f6f90485876 100644 --- a/kernel/multikernel.c +++ b/kernel/multikernel.c @@ -150,7 +150,7 @@ int multikernel_send_ipi_data(int cpu, void *data, size_t data_size, unsigned lo /* Set header information */ target->data_size = data_size; - target->sender_cpu = smp_processor_id(); + target->sender_cpu = arch_cpu_physical_id(smp_processor_id()); target->type = type; /* Copy the actual data into the buffer */ @@ -175,6 +175,7 @@ static void multikernel_interrupt_handler(void) struct mk_ipi_data *data; struct mk_ipi_handler *handler; int current_cpu = smp_processor_id(); + int current_physical_id = arch_cpu_physical_id(current_cpu); /* Ensure shared memory is initialized */ if (!mk_shared_mem) { @@ -183,10 +184,10 @@ static void multikernel_interrupt_handler(void) } /* Get this CPU's data area from shared memory */ - data = &mk_shared_mem->cpu_data[current_cpu]; + data = &mk_shared_mem->cpu_data[current_physical_id]; - pr_debug("Multikernel IPI received on CPU %d from CPU %d, type=%u\n", - current_cpu, data->sender_cpu, data->type); + pr_info("Multikernel IPI received on CPU %d (physical id %d) from CPU %d type=%u\n", + current_cpu, current_physical_id, data->sender_cpu, data->type); raw_spin_lock(&mk_handlers_lock); for (handler = mk_handlers; handler; handler = handler->next) { -- 2.34.1