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_cpu_die(unsigned int cpu)
59{
60	if (common_cpu_die(cpu) == 0) {
61		if (xen_have_vector_callback) {
62			xen_smp_intr_free(cpu);
63			xen_uninit_lock_cpu(cpu);
64			xen_teardown_timer(cpu);
65		}
66	}
67}
68#else
69static void xen_hvm_cpu_die(unsigned int cpu)
70{
71	BUG();
72}
73#endif
74
75void __init xen_hvm_smp_init(void)
76{
77	smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
78	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
79	smp_ops.smp_cpus_done = xen_smp_cpus_done;
80	smp_ops.cpu_die = xen_hvm_cpu_die;
81
82	if (!xen_have_vector_callback) {
83#ifdef CONFIG_PARAVIRT_SPINLOCKS
84		nopvspin = true;
85#endif
86		return;
87	}
88
89	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
90	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
91	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
92}

 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	 * 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
31static 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
52static 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
63static void xen_hvm_cpu_die(unsigned int cpu)
64{
65	BUG();
66}
67#endif
68
69void __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}