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 37 if (xen_have_vector_callback) { 38 WARN_ON(xen_smp_intr_init(0)); 39 xen_init_lock_cpu(0); 40 } 41 42 for_each_possible_cpu(cpu) { 43 if (cpu == 0) 44 continue; 45 46 /* Set default vcpu_id to make sure that we don't use cpu-0's */ 47 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID; 48 } 49 } 50 51 #ifdef CONFIG_HOTPLUG_CPU 52 static void xen_hvm_cpu_die(unsigned int cpu) 53 { 54 if (common_cpu_die(cpu) == 0) { 55 if (xen_have_vector_callback) { 56 xen_smp_intr_free(cpu); 57 xen_uninit_lock_cpu(cpu); 58 xen_teardown_timer(cpu); 59 } 60 } 61 } 62 #else 63 static void xen_hvm_cpu_die(unsigned int cpu) 64 { 65 BUG(); 66 } 67 #endif 68 69 void __init xen_hvm_smp_init(void) 70 { 71 smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu; 72 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; 73 smp_ops.smp_cpus_done = xen_smp_cpus_done; 74 smp_ops.cpu_die = xen_hvm_cpu_die; 75 76 if (!xen_have_vector_callback) { 77 #ifdef CONFIG_PARAVIRT_SPINLOCKS 78 nopvspin = true; 79 #endif 80 return; 81 } 82 83 smp_ops.smp_send_reschedule = xen_smp_send_reschedule; 84 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; 85 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; 86 } 87