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
  25 #include <linux/mm.h>
  26
  27 struct start_info _xen_start_info;
  28 struct start_info *xen_start_info = &_xen_start_info;
  29 EXPORT_SYMBOL_GPL(xen_start_info);
  30
  31 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  32 EXPORT_SYMBOL_GPL(xen_domain_type);
  33
  34 struct shared_info xen_dummy_shared_info;
  35 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  36
  37 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  38 static struct vcpu_info __percpu *xen_vcpu_info;
  39
  40 /* These are unused until we support booting "pre-ballooned" */
  41 unsigned long xen_released_pages;
  42 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
  43
  44 /* TODO: to be removed */
  45 __read_mostly int xen_have_vector_callback;
  46 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
  47
  48 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
  49 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
  50
  51 static __read_mostly int xen_events_irq = -1;
  52
  53 /* map fgmfn of domid to lpfn in the current domain */
  54 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
  55                             unsigned int domid)
  56 {
  57         int rc;
  58         struct xen_add_to_physmap_range xatp = {
  59                 .domid = DOMID_SELF,
  60                 .foreign_domid = domid,
  61                 .size = 1,
  62                 .space = XENMAPSPACE_gmfn_foreign,
  63         };
  64         xen_ulong_t idx = fgmfn;
  65         xen_pfn_t gpfn = lpfn;
  66         int err = 0;
  67
  68         set_xen_guest_handle(xatp.idxs, &idx);
  69         set_xen_guest_handle(xatp.gpfns, &gpfn);
  70         set_xen_guest_handle(xatp.errs, &err);
  71
  72         rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
  73         if (rc || err) {
  74                 pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
  75                         rc, err, lpfn, fgmfn);
  76                 return 1;
  77         }
  78         return 0;
  79 }
  80
  81 struct remap_data {
  82         xen_pfn_t fgmfn; /* foreign domain's gmfn */
  83         pgprot_t prot;
  84         domid_t  domid;
  85         struct vm_area_struct *vma;
  86         int index;
  87         struct page **pages;
  88         struct xen_remap_mfn_info *info;
  89 };
  90
  91 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
  92                         void *data)
  93 {
  94         struct remap_data *info = data;
  95         struct page *page = info->pages[info->index++];
  96         unsigned long pfn = page_to_pfn(page);
  97         pte_t pte = pfn_pte(pfn, info->prot);
  98
  99         if (map_foreign_page(pfn, info->fgmfn, info->domid))
 100                 return -EFAULT;
 101         set_pte_at(info->vma->vm_mm, addr, ptep, pte);
 102
 103         return 0;
 104 }
 105
 106 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
 107                                unsigned long addr,
 108                                xen_pfn_t mfn, int nr,
 109                                pgprot_t prot, unsigned domid,
 110                                struct page **pages)
 111 {
 112         int err;
 113         struct remap_data data;
 114
 115         /* TBD: Batching, current sole caller only does page at a time */
 116         if (nr > 1)
 117                 return -EINVAL;
 118
 119         data.fgmfn = mfn;
 120         data.prot = prot;
 121         data.domid = domid;
 122         data.vma = vma;
 123         data.index = 0;
 124         data.pages = pages;
 125         err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
 126                                   remap_pte_fn, &data);
 127         return err;
 128 }
 129 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
 130
 131 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
 132                                int nr, struct page **pages)
 133 {
 134         int i;
 135
 136         for (i = 0; i < nr; i++) {
 137                 struct xen_remove_from_physmap xrp;
 138                 unsigned long rc, pfn;
 139
 140                 pfn = page_to_pfn(pages[i]);
 141
 142                 xrp.domid = DOMID_SELF;
 143                 xrp.gpfn = pfn;
 144                 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
 145                 if (rc) {
 146                         pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
 147                                 pfn, rc);
 148                         return rc;
 149                 }
 150         }
 151         return 0;
 152 }
 153 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
 154
 155 static void __init xen_percpu_init(void *unused)
 156 {
 157         struct vcpu_register_vcpu_info info;
 158         struct vcpu_info *vcpup;
 159         int err;
 160         int cpu = get_cpu();
 161
 162         pr_info("Xen: initializing cpu%d\n", cpu);
 163         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
 164
 165         info.mfn = __pa(vcpup) >> PAGE_SHIFT;
 166         info.offset = offset_in_page(vcpup);
 167
 168         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
 169         BUG_ON(err);
 170         per_cpu(xen_vcpu, cpu) = vcpup;
 171
 172         enable_percpu_irq(xen_events_irq, 0);
 173         put_cpu();
 174 }
 175
 176 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
 177 {
 178         struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
 179         int rc;
 180         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 181         if (rc)
 182                 BUG();
 183 }
 184
 185 static void xen_power_off(void)
 186 {
 187         struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
 188         int rc;
 189         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 190         if (rc)
 191                 BUG();
 192 }
 193
 194 /*
 195  * see Documentation/devicetree/bindings/arm/xen.txt for the
 196  * documentation of the Xen Device Tree format.
 197  */
 198 #define GRANT_TABLE_PHYSADDR 0
 199 static int __init xen_guest_init(void)
 200 {
 201         struct xen_add_to_physmap xatp;
 202         static struct shared_info *shared_info_page = 0;
 203         struct device_node *node;
 204         int len;
 205         const char *s = NULL;
 206         const char *version = NULL;
 207         const char *xen_prefix = "xen,xen-";
 208         struct resource res;
 209
 210         node = of_find_compatible_node(NULL, NULL, "xen,xen");
 211         if (!node) {
 212                 pr_debug("No Xen support\n");
 213                 return 0;
 214         }
 215         s = of_get_property(node, "compatible", &len);
 216         if (strlen(xen_prefix) + 3  < len &&
 217                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
 218                 version = s + strlen(xen_prefix);
 219         if (version == NULL) {
 220                 pr_debug("Xen version not found\n");
 221                 return 0;
 222         }
 223         if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
 224                 return 0;
 225         xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
 226         xen_events_irq = irq_of_parse_and_map(node, 0);
 227         pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
 228                         version, xen_events_irq, xen_hvm_resume_frames);
 229         xen_domain_type = XEN_HVM_DOMAIN;
 230
 231         xen_setup_features();
 232         if (xen_feature(XENFEAT_dom0))
 233                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
 234         else
 235                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
 236
 237         if (!shared_info_page)
 238                 shared_info_page = (struct shared_info *)
 239                         get_zeroed_page(GFP_KERNEL);
 240         if (!shared_info_page) {
 241                 pr_err("not enough memory\n");
 242                 return -ENOMEM;
 243         }
 244         xatp.domid = DOMID_SELF;
 245         xatp.idx = 0;
 246         xatp.space = XENMAPSPACE_shared_info;
 247         xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
 248         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
 249                 BUG();
 250
 251         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 252
 253         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
 254          * page, we use it in the event channel upcall and in some pvclock
 255          * related functions.
 256          * The shared info contains exactly 1 CPU (the boot CPU). The guest
 257          * is required to use VCPUOP_register_vcpu_info to place vcpu info
 258          * for secondary CPUs as they are brought up.
 259          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
 260          */
 261         xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
 262                                                sizeof(struct vcpu_info));
 263         if (xen_vcpu_info == NULL)
 264                 return -ENOMEM;
 265
 266         gnttab_init();
 267         if (!xen_initial_domain())
 268                 xenbus_probe(NULL);
 269
 270         return 0;
 271 }
 272 core_initcall(xen_guest_init);
 273
 274 static int __init xen_pm_init(void)
 275 {
 276         pm_power_off = xen_power_off;
 277         arm_pm_restart = xen_restart;
 278
 279         return 0;
 280 }
 281 subsys_initcall(xen_pm_init);
 282
 283 static irqreturn_t xen_arm_callback(int irq, void *arg)
 284 {
 285         xen_hvm_evtchn_do_upcall();
 286         return IRQ_HANDLED;
 287 }
 288
 289 static int __init xen_init_events(void)
 290 {
 291         if (!xen_domain() || xen_events_irq < 0)
 292                 return -ENODEV;
 293
 294         xen_init_IRQ();
 295
 296         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
 297                         "events", &xen_vcpu)) {
 298                 pr_err("Error requesting IRQ %d\n", xen_events_irq);
 299                 return -EINVAL;
 300         }
 301
 302         on_each_cpu(xen_percpu_init, NULL, 0);
 303
 304         return 0;
 305 }
 306 postcore_initcall(xen_init_events);
 307
 308 /* In the hypervisor.S file. */
 309 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 310 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
 311 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
 312 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
 313 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
 314 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
 315 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 316 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 317 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
 318 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
 319 EXPORT_SYMBOL_GPL(privcmd_call);