1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Jailhouse paravirt_ops implementation
4 *
5 * Copyright (c) Siemens AG, 2015-2017
6 *
7 * Authors:
8 * Jan Kiszka <jan.kiszka@siemens.com>
9 */
10
11 #include <linux/acpi_pmtmr.h>
12 #include <linux/kernel.h>
13 #include <linux/reboot.h>
14 #include <linux/serial_8250.h>
15 #include <asm/apic.h>
16 #include <asm/io_apic.h>
17 #include <asm/acpi.h>
18 #include <asm/cpu.h>
19 #include <asm/hypervisor.h>
20 #include <asm/i8259.h>
21 #include <asm/irqdomain.h>
22 #include <asm/pci_x86.h>
23 #include <asm/reboot.h>
24 #include <asm/setup.h>
25 #include <asm/jailhouse_para.h>
26
27 static struct jailhouse_setup_data setup_data;
28 #define SETUP_DATA_V1_LEN (sizeof(setup_data.hdr) + sizeof(setup_data.v1))
29 #define SETUP_DATA_V2_LEN (SETUP_DATA_V1_LEN + sizeof(setup_data.v2))
30
31 static unsigned int precalibrated_tsc_khz;
32
jailhouse_setup_irq(unsigned int irq)33 static void jailhouse_setup_irq(unsigned int irq)
34 {
35 struct mpc_intsrc mp_irq = {
36 .type = MP_INTSRC,
37 .irqtype = mp_INT,
38 .irqflag = MP_IRQPOL_ACTIVE_HIGH | MP_IRQTRIG_EDGE,
39 .srcbusirq = irq,
40 .dstirq = irq,
41 };
42 mp_save_irq(&mp_irq);
43 }
44
jailhouse_cpuid_base(void)45 static uint32_t jailhouse_cpuid_base(void)
46 {
47 if (boot_cpu_data.cpuid_level < 0 ||
48 !boot_cpu_has(X86_FEATURE_HYPERVISOR))
49 return 0;
50
51 return hypervisor_cpuid_base("Jailhouse\0\0\0", 0);
52 }
53
jailhouse_detect(void)54 static uint32_t __init jailhouse_detect(void)
55 {
56 return jailhouse_cpuid_base();
57 }
58
jailhouse_get_wallclock(struct timespec64 * now)59 static void jailhouse_get_wallclock(struct timespec64 *now)
60 {
61 memset(now, 0, sizeof(*now));
62 }
63
jailhouse_timer_init(void)64 static void __init jailhouse_timer_init(void)
65 {
66 lapic_timer_period = setup_data.v1.apic_khz * (1000 / HZ);
67 }
68
jailhouse_get_tsc(void)69 static unsigned long jailhouse_get_tsc(void)
70 {
71 return precalibrated_tsc_khz;
72 }
73
jailhouse_x2apic_init(void)74 static void __init jailhouse_x2apic_init(void)
75 {
76 #ifdef CONFIG_X86_X2APIC
77 if (!x2apic_enabled())
78 return;
79 /*
80 * We do not have access to IR inside Jailhouse non-root cells. So
81 * we have to run in physical mode.
82 */
83 x2apic_phys = 1;
84 /*
85 * This will trigger the switch to apic_x2apic_phys. Empty OEM IDs
86 * ensure that only this APIC driver picks up the call.
87 */
88 default_acpi_madt_oem_check("", "");
89 #endif
90 }
91
jailhouse_get_smp_config(unsigned int early)92 static void __init jailhouse_get_smp_config(unsigned int early)
93 {
94 struct ioapic_domain_cfg ioapic_cfg = {
95 .type = IOAPIC_DOMAIN_STRICT,
96 .ops = &mp_ioapic_irqdomain_ops,
97 };
98 unsigned int cpu;
99
100 jailhouse_x2apic_init();
101
102 register_lapic_address(0xfee00000);
103
104 for (cpu = 0; cpu < setup_data.v1.num_cpus; cpu++) {
105 generic_processor_info(setup_data.v1.cpu_ids[cpu],
106 boot_cpu_apic_version);
107 }
108
109 smp_found_config = 1;
110
111 if (setup_data.v1.standard_ioapic) {
112 mp_register_ioapic(0, 0xfec00000, gsi_top, &ioapic_cfg);
113
114 if (IS_ENABLED(CONFIG_SERIAL_8250) &&
115 setup_data.hdr.version < 2) {
116 /* Register 1:1 mapping for legacy UART IRQs 3 and 4 */
117 jailhouse_setup_irq(3);
118 jailhouse_setup_irq(4);
119 }
120 }
121 }
122
jailhouse_no_restart(void)123 static void jailhouse_no_restart(void)
124 {
125 pr_notice("Jailhouse: Restart not supported, halting\n");
126 machine_halt();
127 }
128
jailhouse_pci_arch_init(void)129 static int __init jailhouse_pci_arch_init(void)
130 {
131 pci_direct_init(1);
132
133 /*
134 * There are no bridges on the virtual PCI root bus under Jailhouse,
135 * thus no other way to discover all devices than a full scan.
136 * Respect any overrides via the command line, though.
137 */
138 if (pcibios_last_bus < 0)
139 pcibios_last_bus = 0xff;
140
141 #ifdef CONFIG_PCI_MMCONFIG
142 if (setup_data.v1.pci_mmconfig_base) {
143 pci_mmconfig_add(0, 0, pcibios_last_bus,
144 setup_data.v1.pci_mmconfig_base);
145 pci_mmcfg_arch_init();
146 }
147 #endif
148
149 return 0;
150 }
151
152 #ifdef CONFIG_SERIAL_8250
jailhouse_uart_enabled(unsigned int uart_nr)153 static inline bool jailhouse_uart_enabled(unsigned int uart_nr)
154 {
155 return setup_data.v2.flags & BIT(uart_nr);
156 }
157
jailhouse_serial_fixup(int port,struct uart_port * up,u32 * capabilities)158 static void jailhouse_serial_fixup(int port, struct uart_port *up,
159 u32 *capabilities)
160 {
161 static const u16 pcuart_base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
162 unsigned int n;
163
164 for (n = 0; n < ARRAY_SIZE(pcuart_base); n++) {
165 if (pcuart_base[n] != up->iobase)
166 continue;
167
168 if (jailhouse_uart_enabled(n)) {
169 pr_info("Enabling UART%u (port 0x%lx)\n", n,
170 up->iobase);
171 jailhouse_setup_irq(up->irq);
172 } else {
173 /* Deactivate UART if access isn't allowed */
174 up->iobase = 0;
175 }
176 break;
177 }
178 }
179
jailhouse_serial_workaround(void)180 static void __init jailhouse_serial_workaround(void)
181 {
182 /*
183 * There are flags inside setup_data that indicate availability of
184 * platform UARTs since setup data version 2.
185 *
186 * In case of version 1, we don't know which UARTs belong Linux. In
187 * this case, unconditionally register 1:1 mapping for legacy UART IRQs
188 * 3 and 4.
189 */
190 if (setup_data.hdr.version > 1)
191 serial8250_set_isa_configurator(jailhouse_serial_fixup);
192 }
193 #else /* !CONFIG_SERIAL_8250 */
jailhouse_serial_workaround(void)194 static inline void jailhouse_serial_workaround(void)
195 {
196 }
197 #endif /* CONFIG_SERIAL_8250 */
198
jailhouse_init_platform(void)199 static void __init jailhouse_init_platform(void)
200 {
201 u64 pa_data = boot_params.hdr.setup_data;
202 unsigned long setup_data_len;
203 struct setup_data header;
204 void *mapping;
205
206 x86_init.irqs.pre_vector_init = x86_init_noop;
207 x86_init.timers.timer_init = jailhouse_timer_init;
208 x86_init.mpparse.get_smp_config = jailhouse_get_smp_config;
209 x86_init.pci.arch_init = jailhouse_pci_arch_init;
210
211 x86_platform.calibrate_cpu = jailhouse_get_tsc;
212 x86_platform.calibrate_tsc = jailhouse_get_tsc;
213 x86_platform.get_wallclock = jailhouse_get_wallclock;
214 x86_platform.legacy.rtc = 0;
215 x86_platform.legacy.warm_reset = 0;
216 x86_platform.legacy.i8042 = X86_LEGACY_I8042_PLATFORM_ABSENT;
217
218 legacy_pic = &null_legacy_pic;
219
220 machine_ops.emergency_restart = jailhouse_no_restart;
221
222 while (pa_data) {
223 mapping = early_memremap(pa_data, sizeof(header));
224 memcpy(&header, mapping, sizeof(header));
225 early_memunmap(mapping, sizeof(header));
226
227 if (header.type == SETUP_JAILHOUSE)
228 break;
229
230 pa_data = header.next;
231 }
232
233 if (!pa_data)
234 panic("Jailhouse: No valid setup data found");
235
236 /* setup data must at least contain the header */
237 if (header.len < sizeof(setup_data.hdr))
238 goto unsupported;
239
240 pa_data += offsetof(struct setup_data, data);
241 setup_data_len = min_t(unsigned long, sizeof(setup_data),
242 (unsigned long)header.len);
243 mapping = early_memremap(pa_data, setup_data_len);
244 memcpy(&setup_data, mapping, setup_data_len);
245 early_memunmap(mapping, setup_data_len);
246
247 if (setup_data.hdr.version == 0 ||
248 setup_data.hdr.compatible_version !=
249 JAILHOUSE_SETUP_REQUIRED_VERSION ||
250 (setup_data.hdr.version == 1 && header.len < SETUP_DATA_V1_LEN) ||
251 (setup_data.hdr.version >= 2 && header.len < SETUP_DATA_V2_LEN))
252 goto unsupported;
253
254 pmtmr_ioport = setup_data.v1.pm_timer_address;
255 pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
256
257 precalibrated_tsc_khz = setup_data.v1.tsc_khz;
258 setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
259
260 pci_probe = 0;
261
262 /*
263 * Avoid that the kernel complains about missing ACPI tables - there
264 * are none in a non-root cell.
265 */
266 disable_acpi();
267
268 jailhouse_serial_workaround();
269 return;
270
271 unsupported:
272 panic("Jailhouse: Unsupported setup data structure");
273 }
274
jailhouse_paravirt(void)275 bool jailhouse_paravirt(void)
276 {
277 return jailhouse_cpuid_base() != 0;
278 }
279
jailhouse_x2apic_available(void)280 static bool __init jailhouse_x2apic_available(void)
281 {
282 /*
283 * The x2APIC is only available if the root cell enabled it. Jailhouse
284 * does not support switching between xAPIC and x2APIC.
285 */
286 return x2apic_enabled();
287 }
288
289 const struct hypervisor_x86 x86_hyper_jailhouse __refconst = {
290 .name = "Jailhouse",
291 .detect = jailhouse_detect,
292 .init.init_platform = jailhouse_init_platform,
293 .init.x2apic_available = jailhouse_x2apic_available,
294 .ignore_nopv = true,
295 };
296