1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// SPDX-License-Identifier: GPL-2.0
/*
* Jailhouse paravirt_ops implementation
*
* Copyright (c) Siemens AG, 2015-2017
*
* Authors:
* Jan Kiszka <jan.kiszka@siemens.com>
*/
#include <linux/acpi_pmtmr.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <asm/apic.h>
#include <asm/cpu.h>
#include <asm/hypervisor.h>
#include <asm/i8259.h>
#include <asm/irqdomain.h>
#include <asm/pci_x86.h>
#include <asm/reboot.h>
#include <asm/setup.h>
static __initdata struct jailhouse_setup_data setup_data;
static unsigned int precalibrated_tsc_khz;
static uint32_t jailhouse_cpuid_base(void)
{
if (boot_cpu_data.cpuid_level < 0 ||
!boot_cpu_has(X86_FEATURE_HYPERVISOR))
return 0;
return hypervisor_cpuid_base("Jailhouse\0\0\0", 0);
}
static uint32_t __init jailhouse_detect(void)
{
return jailhouse_cpuid_base();
}
static void jailhouse_get_wallclock(struct timespec *now)
{
memset(now, 0, sizeof(*now));
}
static void __init jailhouse_timer_init(void)
{
lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
}
static unsigned long jailhouse_get_tsc(void)
{
return precalibrated_tsc_khz;
}
static void __init jailhouse_x2apic_init(void)
{
#ifdef CONFIG_X86_X2APIC
if (!x2apic_enabled())
return;
/*
* We do not have access to IR inside Jailhouse non-root cells. So
* we have to run in physical mode.
*/
x2apic_phys = 1;
/*
* This will trigger the switch to apic_x2apic_phys. Empty OEM IDs
* ensure that only this APIC driver picks up the call.
*/
default_acpi_madt_oem_check("", "");
#endif
}
static void __init jailhouse_get_smp_config(unsigned int early)
{
struct ioapic_domain_cfg ioapic_cfg = {
.type = IOAPIC_DOMAIN_STRICT,
.ops = &mp_ioapic_irqdomain_ops,
};
struct mpc_intsrc mp_irq = {
.type = MP_INTSRC,
.irqtype = mp_INT,
.irqflag = MP_IRQPOL_ACTIVE_HIGH | MP_IRQTRIG_EDGE,
};
unsigned int cpu;
jailhouse_x2apic_init();
register_lapic_address(0xfee00000);
for (cpu = 0; cpu < setup_data.num_cpus; cpu++) {
generic_processor_info(setup_data.cpu_ids[cpu],
boot_cpu_apic_version);
}
smp_found_config = 1;
if (setup_data.standard_ioapic) {
mp_register_ioapic(0, 0xfec00000, gsi_top, &ioapic_cfg);
/* Register 1:1 mapping for legacy UART IRQs 3 and 4 */
mp_irq.srcbusirq = mp_irq.dstirq = 3;
mp_save_irq(&mp_irq);
mp_irq.srcbusirq = mp_irq.dstirq = 4;
mp_save_irq(&mp_irq);
}
}
static void jailhouse_no_restart(void)
{
pr_notice("Jailhouse: Restart not supported, halting\n");
machine_halt();
}
static int __init jailhouse_pci_arch_init(void)
{
pci_direct_init(1);
/*
* There are no bridges on the virtual PCI root bus under Jailhouse,
* thus no other way to discover all devices than a full scan.
* Respect any overrides via the command line, though.
*/
if (pcibios_last_bus < 0)
pcibios_last_bus = 0xff;
#ifdef CONFIG_PCI_MMCONFIG
if (setup_data.pci_mmconfig_base) {
pci_mmconfig_add(0, 0, pcibios_last_bus,
setup_data.pci_mmconfig_base);
pci_mmcfg_arch_init();
}
#endif
return 0;
}
static void __init jailhouse_init_platform(void)
{
u64 pa_data = boot_params.hdr.setup_data;
struct setup_data header;
void *mapping;
x86_init.irqs.pre_vector_init = x86_init_noop;
x86_init.timers.timer_init = jailhouse_timer_init;
x86_init.mpparse.get_smp_config = jailhouse_get_smp_config;
x86_init.pci.arch_init = jailhouse_pci_arch_init;
x86_platform.calibrate_cpu = jailhouse_get_tsc;
x86_platform.calibrate_tsc = jailhouse_get_tsc;
x86_platform.get_wallclock = jailhouse_get_wallclock;
x86_platform.legacy.rtc = 0;
x86_platform.legacy.warm_reset = 0;
x86_platform.legacy.i8042 = X86_LEGACY_I8042_PLATFORM_ABSENT;
legacy_pic = &null_legacy_pic;
machine_ops.emergency_restart = jailhouse_no_restart;
while (pa_data) {
mapping = early_memremap(pa_data, sizeof(header));
memcpy(&header, mapping, sizeof(header));
early_memunmap(mapping, sizeof(header));
if (header.type == SETUP_JAILHOUSE &&
header.len >= sizeof(setup_data)) {
pa_data += offsetof(struct setup_data, data);
mapping = early_memremap(pa_data, sizeof(setup_data));
memcpy(&setup_data, mapping, sizeof(setup_data));
early_memunmap(mapping, sizeof(setup_data));
break;
}
pa_data = header.next;
}
if (!pa_data)
panic("Jailhouse: No valid setup data found");
if (setup_data.compatible_version > JAILHOUSE_SETUP_REQUIRED_VERSION)
panic("Jailhouse: Unsupported setup data structure");
pmtmr_ioport = setup_data.pm_timer_address;
pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
precalibrated_tsc_khz = setup_data.tsc_khz;
setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
pci_probe = 0;
/*
* Avoid that the kernel complains about missing ACPI tables - there
* are none in a non-root cell.
*/
disable_acpi();
}
bool jailhouse_paravirt(void)
{
return jailhouse_cpuid_base() != 0;
}
static bool jailhouse_x2apic_available(void)
{
/*
* The x2APIC is only available if the root cell enabled it. Jailhouse
* does not support switching between xAPIC and x2APIC.
*/
return x2apic_enabled();
}
const struct hypervisor_x86 x86_hyper_jailhouse __refconst = {
.name = "Jailhouse",
.detect = jailhouse_detect,
.init.init_platform = jailhouse_init_platform,
.init.x2apic_available = jailhouse_x2apic_available,
};
|
