1 // SPDX-License-Identifier: GPL2.0
3 * Jailhouse paravirt_ops implementation
5 * Copyright (c) Siemens AG, 2015-2017
8 * Jan Kiszka <jan.kiszka@siemens.com>
11 #include <linux/acpi_pmtmr.h>
12 #include <linux/kernel.h>
13 #include <linux/reboot.h>
16 #include <asm/hypervisor.h>
17 #include <asm/i8259.h>
18 #include <asm/irqdomain.h>
19 #include <asm/pci_x86.h>
20 #include <asm/reboot.h>
21 #include <asm/setup.h>
23 static __initdata struct jailhouse_setup_data setup_data;
24 static unsigned int precalibrated_tsc_khz;
26 static uint32_t jailhouse_cpuid_base(void)
28 if (boot_cpu_data.cpuid_level < 0 ||
29 !boot_cpu_has(X86_FEATURE_HYPERVISOR))
32 return hypervisor_cpuid_base("Jailhouse\0\0\0", 0);
35 static uint32_t __init jailhouse_detect(void)
37 return jailhouse_cpuid_base();
40 static void jailhouse_get_wallclock(struct timespec *now)
42 memset(now, 0, sizeof(*now));
45 static void __init jailhouse_timer_init(void)
47 lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
50 static unsigned long jailhouse_get_tsc(void)
52 return precalibrated_tsc_khz;
55 static void __init jailhouse_x2apic_init(void)
57 #ifdef CONFIG_X86_X2APIC
58 if (!x2apic_enabled())
61 * We do not have access to IR inside Jailhouse non-root cells. So
62 * we have to run in physical mode.
66 * This will trigger the switch to apic_x2apic_phys. Empty OEM IDs
67 * ensure that only this APIC driver picks up the call.
69 default_acpi_madt_oem_check("", "");
73 static void __init jailhouse_get_smp_config(unsigned int early)
75 struct ioapic_domain_cfg ioapic_cfg = {
76 .type = IOAPIC_DOMAIN_STRICT,
77 .ops = &mp_ioapic_irqdomain_ops,
79 struct mpc_intsrc mp_irq = {
82 .irqflag = MP_IRQPOL_ACTIVE_HIGH | MP_IRQTRIG_EDGE,
86 jailhouse_x2apic_init();
88 register_lapic_address(0xfee00000);
90 for (cpu = 0; cpu < setup_data.num_cpus; cpu++) {
91 generic_processor_info(setup_data.cpu_ids[cpu],
92 boot_cpu_apic_version);
97 if (setup_data.standard_ioapic) {
98 mp_register_ioapic(0, 0xfec00000, gsi_top, &ioapic_cfg);
100 /* Register 1:1 mapping for legacy UART IRQs 3 and 4 */
101 mp_irq.srcbusirq = mp_irq.dstirq = 3;
102 mp_save_irq(&mp_irq);
104 mp_irq.srcbusirq = mp_irq.dstirq = 4;
105 mp_save_irq(&mp_irq);
109 static void jailhouse_no_restart(void)
111 pr_notice("Jailhouse: Restart not supported, halting\n");
115 static int __init jailhouse_pci_arch_init(void)
120 * There are no bridges on the virtual PCI root bus under Jailhouse,
121 * thus no other way to discover all devices than a full scan.
122 * Respect any overrides via the command line, though.
124 if (pcibios_last_bus < 0)
125 pcibios_last_bus = 0xff;
130 static void __init jailhouse_init_platform(void)
132 u64 pa_data = boot_params.hdr.setup_data;
133 struct setup_data header;
136 x86_init.irqs.pre_vector_init = x86_init_noop;
137 x86_init.timers.timer_init = jailhouse_timer_init;
138 x86_init.mpparse.get_smp_config = jailhouse_get_smp_config;
139 x86_init.pci.arch_init = jailhouse_pci_arch_init;
141 x86_platform.calibrate_cpu = jailhouse_get_tsc;
142 x86_platform.calibrate_tsc = jailhouse_get_tsc;
143 x86_platform.get_wallclock = jailhouse_get_wallclock;
144 x86_platform.legacy.rtc = 0;
145 x86_platform.legacy.warm_reset = 0;
146 x86_platform.legacy.i8042 = X86_LEGACY_I8042_PLATFORM_ABSENT;
148 legacy_pic = &null_legacy_pic;
150 machine_ops.emergency_restart = jailhouse_no_restart;
153 mapping = early_memremap(pa_data, sizeof(header));
154 memcpy(&header, mapping, sizeof(header));
155 early_memunmap(mapping, sizeof(header));
157 if (header.type == SETUP_JAILHOUSE &&
158 header.len >= sizeof(setup_data)) {
159 pa_data += offsetof(struct setup_data, data);
161 mapping = early_memremap(pa_data, sizeof(setup_data));
162 memcpy(&setup_data, mapping, sizeof(setup_data));
163 early_memunmap(mapping, sizeof(setup_data));
168 pa_data = header.next;
172 panic("Jailhouse: No valid setup data found");
174 if (setup_data.compatible_version > JAILHOUSE_SETUP_REQUIRED_VERSION)
175 panic("Jailhouse: Unsupported setup data structure");
177 pmtmr_ioport = setup_data.pm_timer_address;
178 pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
180 precalibrated_tsc_khz = setup_data.tsc_khz;
181 setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
186 * Avoid that the kernel complains about missing ACPI tables - there
187 * are none in a non-root cell.
192 bool jailhouse_paravirt(void)
194 return jailhouse_cpuid_base() != 0;
197 static bool jailhouse_x2apic_available(void)
200 * The x2APIC is only available if the root cell enabled it. Jailhouse
201 * does not support switching between xAPIC and x2APIC.
203 return x2apic_enabled();
206 const struct hypervisor_x86 x86_hyper_jailhouse __refconst = {
208 .detect = jailhouse_detect,
209 .init.init_platform = jailhouse_init_platform,
210 .init.x2apic_available = jailhouse_x2apic_available,