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 28 #include <linux/mm.h> 29 30 struct start_info _xen_start_info; 31 struct start_info *xen_start_info = &_xen_start_info; 32 EXPORT_SYMBOL_GPL(xen_start_info); 33 34 enum xen_domain_type xen_domain_type = XEN_NATIVE; 35 EXPORT_SYMBOL_GPL(xen_domain_type); 36 37 struct shared_info xen_dummy_shared_info; 38 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; 39 40 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); 41 static struct vcpu_info __percpu *xen_vcpu_info; 42 43 /* These are unused until we support booting "pre-ballooned" */ 44 unsigned long xen_released_pages; 45 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; 46 47 /* TODO: to be removed */ 48 __read_mostly int xen_have_vector_callback; 49 EXPORT_SYMBOL_GPL(xen_have_vector_callback); 50 51 int xen_platform_pci_unplug = XEN_UNPLUG_ALL; 52 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug); 53 54 static __read_mostly int xen_events_irq = -1; 55 56 /* map fgmfn of domid to lpfn in the current domain */ 57 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn, 58 unsigned int domid) 59 { 60 int rc; 61 struct xen_add_to_physmap_range xatp = { 62 .domid = DOMID_SELF, 63 .foreign_domid = domid, 64 .size = 1, 65 .space = XENMAPSPACE_gmfn_foreign, 66 }; 67 xen_ulong_t idx = fgmfn; 68 xen_pfn_t gpfn = lpfn; 69 int err = 0; 70 71 set_xen_guest_handle(xatp.idxs, &idx); 72 set_xen_guest_handle(xatp.gpfns, &gpfn); 73 set_xen_guest_handle(xatp.errs, &err); 74 75 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp); 76 if (rc || err) { 77 pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n", 78 rc, err, lpfn, fgmfn); 79 return 1; 80 } 81 return 0; 82 } 83 84 struct remap_data { 85 xen_pfn_t fgmfn; /* foreign domain's gmfn */ 86 pgprot_t prot; 87 domid_t domid; 88 struct vm_area_struct *vma; 89 int index; 90 struct page **pages; 91 struct xen_remap_mfn_info *info; 92 }; 93 94 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr, 95 void *data) 96 { 97 struct remap_data *info = data; 98 struct page *page = info->pages[info->index++]; 99 unsigned long pfn = page_to_pfn(page); 100 pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot)); 101 102 if (map_foreign_page(pfn, info->fgmfn, info->domid)) 103 return -EFAULT; 104 set_pte_at(info->vma->vm_mm, addr, ptep, pte); 105 106 return 0; 107 } 108 109 int xen_remap_domain_mfn_range(struct vm_area_struct *vma, 110 unsigned long addr, 111 xen_pfn_t mfn, int nr, 112 pgprot_t prot, unsigned domid, 113 struct page **pages) 114 { 115 int err; 116 struct remap_data data; 117 118 /* TBD: Batching, current sole caller only does page at a time */ 119 if (nr > 1) 120 return -EINVAL; 121 122 data.fgmfn = mfn; 123 data.prot = prot; 124 data.domid = domid; 125 data.vma = vma; 126 data.index = 0; 127 data.pages = pages; 128 err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT, 129 remap_pte_fn, &data); 130 return err; 131 } 132 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); 133 134 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma, 135 int nr, struct page **pages) 136 { 137 int i; 138 139 for (i = 0; i < nr; i++) { 140 struct xen_remove_from_physmap xrp; 141 unsigned long rc, pfn; 142 143 pfn = page_to_pfn(pages[i]); 144 145 xrp.domid = DOMID_SELF; 146 xrp.gpfn = pfn; 147 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp); 148 if (rc) { 149 pr_warn("Failed to unmap pfn:%lx rc:%ld\n", 150 pfn, rc); 151 return rc; 152 } 153 } 154 return 0; 155 } 156 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range); 157 158 static void xen_percpu_init(void) 159 { 160 struct vcpu_register_vcpu_info info; 161 struct vcpu_info *vcpup; 162 int err; 163 int cpu = get_cpu(); 164 165 pr_info("Xen: initializing cpu%d\n", cpu); 166 vcpup = per_cpu_ptr(xen_vcpu_info, cpu); 167 168 info.mfn = __pa(vcpup) >> PAGE_SHIFT; 169 info.offset = offset_in_page(vcpup); 170 171 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 172 BUG_ON(err); 173 per_cpu(xen_vcpu, cpu) = vcpup; 174 175 enable_percpu_irq(xen_events_irq, 0); 176 put_cpu(); 177 } 178 179 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd) 180 { 181 struct sched_shutdown r = { .reason = SHUTDOWN_reboot }; 182 int rc; 183 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 184 if (rc) 185 BUG(); 186 } 187 188 static void xen_power_off(void) 189 { 190 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff }; 191 int rc; 192 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r); 193 if (rc) 194 BUG(); 195 } 196 197 static int xen_cpu_notification(struct notifier_block *self, 198 unsigned long action, 199 void *hcpu) 200 { 201 switch (action) { 202 case CPU_STARTING: 203 xen_percpu_init(); 204 break; 205 default: 206 break; 207 } 208 209 return NOTIFY_OK; 210 } 211 212 static struct notifier_block xen_cpu_notifier = { 213 .notifier_call = xen_cpu_notification, 214 }; 215 216 static irqreturn_t xen_arm_callback(int irq, void *arg) 217 { 218 xen_hvm_evtchn_do_upcall(); 219 return IRQ_HANDLED; 220 } 221 222 /* 223 * see Documentation/devicetree/bindings/arm/xen.txt for the 224 * documentation of the Xen Device Tree format. 225 */ 226 #define GRANT_TABLE_PHYSADDR 0 227 static int __init xen_guest_init(void) 228 { 229 struct xen_add_to_physmap xatp; 230 static struct shared_info *shared_info_page = 0; 231 struct device_node *node; 232 int len; 233 const char *s = NULL; 234 const char *version = NULL; 235 const char *xen_prefix = "xen,xen-"; 236 struct resource res; 237 phys_addr_t grant_frames; 238 239 node = of_find_compatible_node(NULL, NULL, "xen,xen"); 240 if (!node) { 241 pr_debug("No Xen support\n"); 242 return 0; 243 } 244 s = of_get_property(node, "compatible", &len); 245 if (strlen(xen_prefix) + 3 < len && 246 !strncmp(xen_prefix, s, strlen(xen_prefix))) 247 version = s + strlen(xen_prefix); 248 if (version == NULL) { 249 pr_debug("Xen version not found\n"); 250 return 0; 251 } 252 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) 253 return 0; 254 grant_frames = res.start; 255 xen_events_irq = irq_of_parse_and_map(node, 0); 256 pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n", 257 version, xen_events_irq, &grant_frames); 258 259 if (xen_events_irq < 0) 260 return -ENODEV; 261 262 xen_domain_type = XEN_HVM_DOMAIN; 263 264 xen_setup_features(); 265 if (xen_feature(XENFEAT_dom0)) 266 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 267 else 268 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); 269 270 if (!shared_info_page) 271 shared_info_page = (struct shared_info *) 272 get_zeroed_page(GFP_KERNEL); 273 if (!shared_info_page) { 274 pr_err("not enough memory\n"); 275 return -ENOMEM; 276 } 277 xatp.domid = DOMID_SELF; 278 xatp.idx = 0; 279 xatp.space = XENMAPSPACE_shared_info; 280 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; 281 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 282 BUG(); 283 284 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 285 286 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 287 * page, we use it in the event channel upcall and in some pvclock 288 * related functions. 289 * The shared info contains exactly 1 CPU (the boot CPU). The guest 290 * is required to use VCPUOP_register_vcpu_info to place vcpu info 291 * for secondary CPUs as they are brought up. 292 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0. 293 */ 294 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info), 295 sizeof(struct vcpu_info)); 296 if (xen_vcpu_info == NULL) 297 return -ENOMEM; 298 299 if (gnttab_setup_auto_xlat_frames(grant_frames)) { 300 free_percpu(xen_vcpu_info); 301 return -ENOMEM; 302 } 303 gnttab_init(); 304 if (!xen_initial_domain()) 305 xenbus_probe(NULL); 306 307 /* 308 * Making sure board specific code will not set up ops for 309 * cpu idle and cpu freq. 310 */ 311 disable_cpuidle(); 312 disable_cpufreq(); 313 314 xen_init_IRQ(); 315 316 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 317 "events", &xen_vcpu)) { 318 pr_err("Error request IRQ %d\n", xen_events_irq); 319 return -EINVAL; 320 } 321 322 xen_percpu_init(); 323 324 register_cpu_notifier(&xen_cpu_notifier); 325 326 return 0; 327 } 328 early_initcall(xen_guest_init); 329 330 static int __init xen_pm_init(void) 331 { 332 if (!xen_domain()) 333 return -ENODEV; 334 335 pm_power_off = xen_power_off; 336 arm_pm_restart = xen_restart; 337 338 return 0; 339 } 340 late_initcall(xen_pm_init); 341 342 /* In the hypervisor.S file. */ 343 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 344 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 345 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 346 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 347 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 348 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 349 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 350 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 351 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op); 352 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op); 353 EXPORT_SYMBOL_GPL(privcmd_call); 354