1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/thread_info.h> 3 #include <asm/smp.h> 4 5 #include <xen/events.h> 6 7 #include "xen-ops.h" 8 #include "smp.h" 9 10 11 static void __init xen_hvm_smp_prepare_boot_cpu(void) 12 { 13 BUG_ON(smp_processor_id() != 0); 14 native_smp_prepare_boot_cpu(); 15 16 /* 17 * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info 18 * in xen_cpu_up_prepare_hvm(). 19 */ 20 xen_vcpu_setup(0); 21 22 /* 23 * The alternative logic (which patches the unlock/lock) runs before 24 * the smp bootup up code is activated. Hence we need to set this up 25 * the core kernel is being patched. Otherwise we will have only 26 * modules patched but not core code. 27 */ 28 xen_init_spinlocks(); 29 } 30 31 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) 32 { 33 int cpu; 34 35 native_smp_prepare_cpus(max_cpus); 36 WARN_ON(xen_smp_intr_init(0)); 37 38 xen_init_lock_cpu(0); 39 40 for_each_possible_cpu(cpu) { 41 if (cpu == 0) 42 continue; 43 44 /* Set default vcpu_id to make sure that we don't use cpu-0's */ 45 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID; 46 } 47 } 48 49 #ifdef CONFIG_HOTPLUG_CPU 50 static void xen_hvm_cpu_die(unsigned int cpu) 51 { 52 if (common_cpu_die(cpu) == 0) { 53 xen_smp_intr_free(cpu); 54 xen_uninit_lock_cpu(cpu); 55 xen_teardown_timer(cpu); 56 } 57 } 58 #else 59 static void xen_hvm_cpu_die(unsigned int cpu) 60 { 61 BUG(); 62 } 63 #endif 64 65 void __init xen_hvm_smp_init(void) 66 { 67 if (!xen_have_vector_callback) 68 return; 69 70 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; 71 smp_ops.smp_send_reschedule = xen_smp_send_reschedule; 72 smp_ops.cpu_die = xen_hvm_cpu_die; 73 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; 74 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; 75 smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu; 76 smp_ops.smp_cpus_done = xen_smp_cpus_done; 77 } 78