arch/arm/xen/enlighten.c

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