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