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