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 /* 90 * VCPUOP_register_vcpu_info cannot be called twice for the same 91 * vcpu, so if vcpu_info is already registered, just get out. This 92 * can happen with cpu-hotplug. 93 */ 94 if (per_cpu(xen_vcpu, cpu) != NULL) 95 goto after_register_vcpu_info; 96 97 pr_info("Xen: initializing cpu%d\n", cpu); 98 vcpup = per_cpu_ptr(xen_vcpu_info, cpu); 99 100 info.mfn = virt_to_gfn(vcpup); 101 info.offset = xen_offset_in_page(vcpup); 102 103 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 104 BUG_ON(err); 105 per_cpu(xen_vcpu, cpu) = vcpup; 106 107 after_register_vcpu_info: 108 enable_percpu_irq(xen_events_irq, 0); 109 put_cpu(); 110 } 111 112 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) 113 { 114 struct sched_shutdown r = { .reason = SHUTDOWN_reboot }; 115 int rc; 116 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 117 BUG_ON(rc); 118 } 119 120 static void xen_power_off(void) 121 { 122 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff }; 123 int rc; 124 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 125 BUG_ON(rc); 126 } 127 128 static int xen_cpu_notification(struct notifier_block *self, 129 unsigned long action, 130 void *hcpu) 131 { 132 switch (action) { 133 case CPU_STARTING: 134 xen_percpu_init(); 135 break; 136 case CPU_DYING: 137 disable_percpu_irq(xen_events_irq); 138 break; 139 default: 140 break; 141 } 142 143 return NOTIFY_OK; 144 } 145 146 static struct notifier_block xen_cpu_notifier = { 147 .notifier_call = xen_cpu_notification, 148 }; 149 150 static irqreturn_t xen_arm_callback(int irq, void *arg) 151 { 152 xen_hvm_evtchn_do_upcall(); 153 return IRQ_HANDLED; 154 } 155 156 /* 157 * see Documentation/devicetree/bindings/arm/xen.txt for the 158 * documentation of the Xen Device Tree format. 159 */ 160 #define GRANT_TABLE_PHYSADDR 0 161 void __init xen_early_init(void) 162 { 163 int len; 164 const char *s = NULL; 165 const char *version = NULL; 166 const char *xen_prefix = "xen,xen-"; 167 168 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen"); 169 if (!xen_node) { 170 pr_debug("No Xen support\n"); 171 return; 172 } 173 s = of_get_property(xen_node, "compatible", &len); 174 if (strlen(xen_prefix) + 3 < len && 175 !strncmp(xen_prefix, s, strlen(xen_prefix))) 176 version = s + strlen(xen_prefix); 177 if (version == NULL) { 178 pr_debug("Xen version not found\n"); 179 return; 180 } 181 182 pr_info("Xen %s support found\n", version); 183 184 xen_domain_type = XEN_HVM_DOMAIN; 185 186 xen_setup_features(); 187 188 if (xen_feature(XENFEAT_dom0)) 189 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 190 else 191 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); 192 193 if (!console_set_on_cmdline && !xen_initial_domain()) 194 add_preferred_console("hvc", 0, NULL); 195 } 196 197 static int __init xen_guest_init(void) 198 { 199 struct xen_add_to_physmap xatp; 200 struct shared_info *shared_info_page = NULL; 201 struct resource res; 202 phys_addr_t grant_frames; 203 204 if (!xen_domain()) 205 return 0; 206 207 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) { 208 pr_err("Xen grant table base address not found\n"); 209 return -ENODEV; 210 } 211 grant_frames = res.start; 212 213 xen_events_irq = irq_of_parse_and_map(xen_node, 0); 214 if (!xen_events_irq) { 215 pr_err("Xen event channel interrupt not found\n"); 216 return -ENODEV; 217 } 218 219 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); 220 221 if (!shared_info_page) { 222 pr_err("not enough memory\n"); 223 return -ENOMEM; 224 } 225 xatp.domid = DOMID_SELF; 226 xatp.idx = 0; 227 xatp.space = XENMAPSPACE_shared_info; 228 xatp.gpfn = virt_to_gfn(shared_info_page); 229 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 230 BUG(); 231 232 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 233 234 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 235 * page, we use it in the event channel upcall and in some pvclock 236 * related functions. 237 * The shared info contains exactly 1 CPU (the boot CPU). The guest 238 * is required to use VCPUOP_register_vcpu_info to place vcpu info 239 * for secondary CPUs as they are brought up. 240 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. 241 */ 242 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info), 243 sizeof(struct vcpu_info)); 244 if (xen_vcpu_info == NULL) 245 return -ENOMEM; 246 247 if (gnttab_setup_auto_xlat_frames(grant_frames)) { 248 free_percpu(xen_vcpu_info); 249 return -ENOMEM; 250 } 251 gnttab_init(); 252 if (!xen_initial_domain()) 253 xenbus_probe(NULL); 254 255 /* 256 * Making sure board specific code will not set up ops for 257 * cpu idle and cpu freq. 258 */ 259 disable_cpuidle(); 260 disable_cpufreq(); 261 262 xen_init_IRQ(); 263 264 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 265 "events", &xen_vcpu)) { 266 pr_err("Error request IRQ %d\n", xen_events_irq); 267 return -EINVAL; 268 } 269 270 xen_percpu_init(); 271 272 register_cpu_notifier(&xen_cpu_notifier); 273 274 return 0; 275 } 276 early_initcall(xen_guest_init); 277 278 static int __init xen_pm_init(void) 279 { 280 if (!xen_domain()) 281 return -ENODEV; 282 283 pm_power_off = xen_power_off; 284 arm_pm_restart = xen_restart; 285 286 return 0; 287 } 288 late_initcall(xen_pm_init); 289 290 291 /* empty stubs */ 292 void xen_arch_pre_suspend(void) { } 293 void xen_arch_post_suspend(int suspend_cancelled) { } 294 void xen_timer_resume(void) { } 295 void xen_arch_resume(void) { } 296 void xen_arch_suspend(void) { } 297 298 299 /* In the hypercall.S file. */ 300 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 301 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 302 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 303 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 304 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 305 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 306 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 307 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 308 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); 309 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); 310 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall); 311 EXPORT_SYMBOL_GPL(privcmd_call); 312