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
9 static void __init xen_hvm_smp_prepare_boot_cpu(void)
10 {
11 BUG_ON(smp_processor_id() != 0);
12 native_smp_prepare_boot_cpu();
13
14 /*
15 * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
16 * in xen_cpu_up_prepare_hvm().
17 */
18 xen_vcpu_setup(0);
19
20 /*
21 * Called again in case the kernel boots on vcpu >= MAX_VIRT_CPUS.
22 * Refer to comments in xen_hvm_init_time_ops().
23 */
24 xen_hvm_init_time_ops();
25
26 /*
27 * The alternative logic (which patches the unlock/lock) runs before
28 * the smp bootup up code is activated. Hence we need to set this up
29 * the core kernel is being patched. Otherwise we will have only
30 * modules patched but not core code.
31 */
32 xen_init_spinlocks();
33 }
34
35 static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
36 {
37 int cpu;
38
39 native_smp_prepare_cpus(max_cpus);
40
41 if (xen_have_vector_callback) {
42 WARN_ON(xen_smp_intr_init(0));
43 xen_init_lock_cpu(0);
44 }
45
46 for_each_possible_cpu(cpu) {
47 if (cpu == 0)
48 continue;
49
50 /* Set default vcpu_id to make sure that we don't use cpu-0's */
51 per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
52 }
53 }
54
55 #ifdef CONFIG_HOTPLUG_CPU
56 static void xen_hvm_cleanup_dead_cpu(unsigned int cpu)
57 {
58 if (xen_have_vector_callback) {
59 xen_smp_intr_free(cpu);
60 xen_uninit_lock_cpu(cpu);
61 xen_teardown_timer(cpu);
62 }
63 }
64 #else
65 static void xen_hvm_cleanup_dead_cpu(unsigned int cpu)
66 {
67 BUG();
68 }
69 #endif
70
71 void __init xen_hvm_smp_init(void)
72 {
73 smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
74 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
75 smp_ops.smp_cpus_done = xen_smp_cpus_done;
76 smp_ops.cleanup_dead_cpu = xen_hvm_cleanup_dead_cpu;
77
78 if (!xen_have_vector_callback) {
79 #ifdef CONFIG_PARAVIRT_SPINLOCKS
80 nopvspin = true;
81 #endif
82 return;
83 }
84
85 smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
86 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
87 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
88 }
89
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