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
11static 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
37static 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
58static 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
67static void xen_hvm_cleanup_dead_cpu(unsigned int cpu)
68{
69	BUG();
70}
71#endif
72
73void __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