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 * Called again in case the kernel boots on vcpu >= MAX_VIRT_CPUS. 24 * Refer to comments in xen_hvm_init_time_ops(). 25 */ 26 xen_hvm_init_time_ops(); 27 28 /* 29 * The alternative logic (which patches the unlock/lock) runs before 30 * the smp bootup up code is activated. Hence we need to set this up 31 * the core kernel is being patched. Otherwise we will have only 32 * modules patched but not core code. 33 */ 34 xen_init_spinlocks(); 35 } 36 37 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) 38 { 39 int cpu; 40 41 native_smp_prepare_cpus(max_cpus); 42 43 if (xen_have_vector_callback) { 44 WARN_ON(xen_smp_intr_init(0)); 45 xen_init_lock_cpu(0); 46 } 47 48 for_each_possible_cpu(cpu) { 49 if (cpu == 0) 50 continue; 51 52 /* Set default vcpu_id to make sure that we don't use cpu-0's */ 53 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID; 54 } 55 } 56 57 #ifdef CONFIG_HOTPLUG_CPU 58 static void xen_hvm_cleanup_dead_cpu(unsigned int cpu) 59 { 60 if (xen_have_vector_callback) { 61 xen_smp_intr_free(cpu); 62 xen_uninit_lock_cpu(cpu); 63 xen_teardown_timer(cpu); 64 } 65 } 66 #else 67 static void xen_hvm_cleanup_dead_cpu(unsigned int cpu) 68 { 69 BUG(); 70 } 71 #endif 72 73 void __init xen_hvm_smp_init(void) 74 { 75 smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu; 76 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; 77 smp_ops.smp_cpus_done = xen_smp_cpus_done; 78 smp_ops.cleanup_dead_cpu = xen_hvm_cleanup_dead_cpu; 79 80 if (!xen_have_vector_callback) { 81 #ifdef CONFIG_PARAVIRT_SPINLOCKS 82 nopvspin = true; 83 #endif 84 return; 85 } 86 87 smp_ops.smp_send_reschedule = xen_smp_send_reschedule; 88 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; 89 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; 90 } 91