1 #include <xen/xen.h> 2 #include <xen/events.h> 3 #include <xen/grant_table.h> 4 #include <xen/hvm.h> 5 #include <xen/interface/vcpu.h> 6 #include <xen/interface/xen.h> 7 #include <xen/interface/memory.h> 8 #include <xen/interface/hvm/params.h> 9 #include <xen/features.h> 10 #include <xen/platform_pci.h> 11 #include <xen/xenbus.h> 12 #include <xen/page.h> 13 #include <xen/interface/sched.h> 14 #include <xen/xen-ops.h> 15 #include <asm/xen/hypervisor.h> 16 #include <asm/xen/hypercall.h> 17 #include <asm/system_misc.h> 18 #include <linux/interrupt.h> 19 #include <linux/irqreturn.h> 20 #include <linux/module.h> 21 #include <linux/of.h> 22 #include <linux/of_irq.h> 23 #include <linux/of_address.h> 24 #include <linux/cpuidle.h> 25 #include <linux/cpufreq.h> 26 #include <linux/cpu.h> 27 #include <linux/console.h> 28 29 #include <linux/mm.h> 30 31 struct start_info _xen_start_info; 32 struct start_info *xen_start_info = &_xen_start_info; 33 EXPORT_SYMBOL(xen_start_info); 34 35 enum xen_domain_type xen_domain_type = XEN_NATIVE; 36 EXPORT_SYMBOL(xen_domain_type); 37 38 struct shared_info xen_dummy_shared_info; 39 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; 40 41 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); 42 static struct vcpu_info __percpu *xen_vcpu_info; 43 44 /* These are unused until we support booting "pre-ballooned" */ 45 unsigned long xen_released_pages; 46 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; 47 48 static __read_mostly unsigned int xen_events_irq; 49 50 static __initdata struct device_node *xen_node; 51 52 int xen_remap_domain_gfn_array(struct vm_area_struct *vma, 53 unsigned long addr, 54 xen_pfn_t *gfn, int nr, 55 int *err_ptr, pgprot_t prot, 56 unsigned domid, 57 struct page **pages) 58 { 59 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr, 60 prot, domid, pages); 61 } 62 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array); 63 64 /* Not used by XENFEAT_auto_translated guests. */ 65 int xen_remap_domain_gfn_range(struct vm_area_struct *vma, 66 unsigned long addr, 67 xen_pfn_t gfn, int nr, 68 pgprot_t prot, unsigned domid, 69 struct page **pages) 70 { 71 return -ENOSYS; 72 } 73 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range); 74 75 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, 76 int nr, struct page **pages) 77 { 78 return xen_xlate_unmap_gfn_range(vma, nr, pages); 79 } 80 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); 81 82 static void xen_percpu_init(void) 83 { 84 struct vcpu_register_vcpu_info info; 85 struct vcpu_info *vcpup; 86 int err; 87 int cpu = get_cpu(); 88 89 pr_info("Xen: initializing cpu%d\n", cpu); 90 vcpup = per_cpu_ptr(xen_vcpu_info, cpu); 91 92 info.mfn = __pa(vcpup) >> PAGE_SHIFT; 93 info.offset = offset_in_page(vcpup); 94 95 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 96 BUG_ON(err); 97 per_cpu(xen_vcpu, cpu) = vcpup; 98 99 enable_percpu_irq(xen_events_irq, 0); 100 put_cpu(); 101 } 102 103 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) 104 { 105 struct sched_shutdown r = { .reason = SHUTDOWN_reboot }; 106 int rc; 107 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 108 BUG_ON(rc); 109 } 110 111 static void xen_power_off(void) 112 { 113 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff }; 114 int rc; 115 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 116 BUG_ON(rc); 117 } 118 119 static int xen_cpu_notification(struct notifier_block *self, 120 unsigned long action, 121 void *hcpu) 122 { 123 switch (action) { 124 case CPU_STARTING: 125 xen_percpu_init(); 126 break; 127 default: 128 break; 129 } 130 131 return NOTIFY_OK; 132 } 133 134 static struct notifier_block xen_cpu_notifier = { 135 .notifier_call = xen_cpu_notification, 136 }; 137 138 static irqreturn_t xen_arm_callback(int irq, void *arg) 139 { 140 xen_hvm_evtchn_do_upcall(); 141 return IRQ_HANDLED; 142 } 143 144 /* 145 * see Documentation/devicetree/bindings/arm/xen.txt for the 146 * documentation of the Xen Device Tree format. 147 */ 148 #define GRANT_TABLE_PHYSADDR 0 149 void __init xen_early_init(void) 150 { 151 int len; 152 const char *s = NULL; 153 const char *version = NULL; 154 const char *xen_prefix = "xen,xen-"; 155 156 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); 157 if (!xen_node) { 158 pr_debug("No Xen support\n"); 159 return; 160 } 161 s = of_get_property(xen_node, "compatible", &len); 162 if (strlen(xen_prefix) + 3 < len && 163 !strncmp(xen_prefix, s, strlen(xen_prefix))) 164 version = s + strlen(xen_prefix); 165 if (version == NULL) { 166 pr_debug("Xen version not found\n"); 167 return; 168 } 169 170 pr_info("Xen %s support found\n", version); 171 172 xen_domain_type = XEN_HVM_DOMAIN; 173 174 xen_setup_features(); 175 176 if (xen_feature(XENFEAT_dom0)) 177 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 178 else 179 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); 180 181 if (!console_set_on_cmdline && !xen_initial_domain()) 182 add_preferred_console("hvc", 0, NULL); 183 } 184 185 static int __init xen_guest_init(void) 186 { 187 struct xen_add_to_physmap xatp; 188 struct shared_info *shared_info_page = NULL; 189 struct resource res; 190 phys_addr_t grant_frames; 191 192 if (!xen_domain()) 193 return 0; 194 195 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) { 196 pr_err("Xen grant table base address not found\n"); 197 return -ENODEV; 198 } 199 grant_frames = res.start; 200 201 xen_events_irq = irq_of_parse_and_map(xen_node, 0); 202 if (!xen_events_irq) { 203 pr_err("Xen event channel interrupt not found\n"); 204 return -ENODEV; 205 } 206 207 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); 208 209 if (!shared_info_page) { 210 pr_err("not enough memory\n"); 211 return -ENOMEM; 212 } 213 xatp.domid = DOMID_SELF; 214 xatp.idx = 0; 215 xatp.space = XENMAPSPACE_shared_info; 216 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; 217 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 218 BUG(); 219 220 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 221 222 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 223 * page, we use it in the event channel upcall and in some pvclock 224 * related functions. 225 * The shared info contains exactly 1 CPU (the boot CPU). The guest 226 * is required to use VCPUOP_register_vcpu_info to place vcpu info 227 * for secondary CPUs as they are brought up. 228 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. 229 */ 230 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info), 231 sizeof(struct vcpu_info)); 232 if (xen_vcpu_info == NULL) 233 return -ENOMEM; 234 235 if (gnttab_setup_auto_xlat_frames(grant_frames)) { 236 free_percpu(xen_vcpu_info); 237 return -ENOMEM; 238 } 239 gnttab_init(); 240 if (!xen_initial_domain()) 241 xenbus_probe(NULL); 242 243 /* 244 * Making sure board specific code will not set up ops for 245 * cpu idle and cpu freq. 246 */ 247 disable_cpuidle(); 248 disable_cpufreq(); 249 250 xen_init_IRQ(); 251 252 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 253 "events", &xen_vcpu)) { 254 pr_err("Error request IRQ %d\n", xen_events_irq); 255 return -EINVAL; 256 } 257 258 xen_percpu_init(); 259 260 register_cpu_notifier(&xen_cpu_notifier); 261 262 return 0; 263 } 264 early_initcall(xen_guest_init); 265 266 static int __init xen_pm_init(void) 267 { 268 if (!xen_domain()) 269 return -ENODEV; 270 271 pm_power_off = xen_power_off; 272 arm_pm_restart = xen_restart; 273 274 return 0; 275 } 276 late_initcall(xen_pm_init); 277 278 279 /* empty stubs */ 280 void xen_arch_pre_suspend(void) { } 281 void xen_arch_post_suspend(int suspend_cancelled) { } 282 void xen_timer_resume(void) { } 283 void xen_arch_resume(void) { } 284 void xen_arch_suspend(void) { } 285 286 287 /* In the hypervisor.S file. */ 288 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 289 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 290 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 291 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 292 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 293 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 294 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 295 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 296 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); 297 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); 298 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); 299 EXPORT_SYMBOL_GPL(privcmd_call); 300