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/xen.h>
   6 #include <xen/interface/memory.h>
   7 #include <xen/interface/hvm/params.h>
   8 #include <xen/features.h>
   9 #include <xen/platform_pci.h>
  10 #include <xen/xenbus.h>
  11 #include <asm/xen/hypervisor.h>
  12 #include <asm/xen/hypercall.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irqreturn.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/of_address.h>
  19
  20 struct start_info _xen_start_info;
  21 struct start_info *xen_start_info = &_xen_start_info;
  22 EXPORT_SYMBOL_GPL(xen_start_info);
  23
  24 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  25 EXPORT_SYMBOL_GPL(xen_domain_type);
  26
  27 struct shared_info xen_dummy_shared_info;
  28 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  29
  30 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  31
  32 /* TODO: to be removed */
  33 __read_mostly int xen_have_vector_callback;
  34 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
  35
  36 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
  37 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
  38
  39 static __read_mostly int xen_events_irq = -1;
  40
  41 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
  42                                unsigned long addr,
  43                                unsigned long mfn, int nr,
  44                                pgprot_t prot, unsigned domid)
  45 {
  46         return -ENOSYS;
  47 }
  48 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
  49
  50 /*
  51  * see Documentation/devicetree/bindings/arm/xen.txt for the
  52  * documentation of the Xen Device Tree format.
  53  */
  54 #define GRANT_TABLE_PHYSADDR 0
  55 static int __init xen_guest_init(void)
  56 {
  57         struct xen_add_to_physmap xatp;
  58         static struct shared_info *shared_info_page = 0;
  59         struct device_node *node;
  60         int len;
  61         const char *s = NULL;
  62         const char *version = NULL;
  63         const char *xen_prefix = "xen,xen-";
  64         struct resource res;
  65
  66         node = of_find_compatible_node(NULL, NULL, "xen,xen");
  67         if (!node) {
  68                 pr_debug("No Xen support\n");
  69                 return 0;
  70         }
  71         s = of_get_property(node, "compatible", &len);
  72         if (strlen(xen_prefix) + 3  < len &&
  73                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
  74                 version = s + strlen(xen_prefix);
  75         if (version == NULL) {
  76                 pr_debug("Xen version not found\n");
  77                 return 0;
  78         }
  79         if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
  80                 return 0;
  81         xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
  82         xen_events_irq = irq_of_parse_and_map(node, 0);
  83         pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
  84                         version, xen_events_irq, xen_hvm_resume_frames);
  85         xen_domain_type = XEN_HVM_DOMAIN;
  86
  87         xen_setup_features();
  88         if (xen_feature(XENFEAT_dom0))
  89                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
  90         else
  91                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
  92
  93         if (!shared_info_page)
  94                 shared_info_page = (struct shared_info *)
  95                         get_zeroed_page(GFP_KERNEL);
  96         if (!shared_info_page) {
  97                 pr_err("not enough memory\n");
  98                 return -ENOMEM;
  99         }
 100         xatp.domid = DOMID_SELF;
 101         xatp.idx = 0;
 102         xatp.space = XENMAPSPACE_shared_info;
 103         xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
 104         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
 105                 BUG();
 106
 107         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 108
 109         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
 110          * page, we use it in the event channel upcall and in some pvclock
 111          * related functions. We don't need the vcpu_info placement
 112          * optimizations because we don't use any pv_mmu or pv_irq op on
 113          * HVM.
 114          * The shared info contains exactly 1 CPU (the boot CPU). The guest
 115          * is required to use VCPUOP_register_vcpu_info to place vcpu info
 116          * for secondary CPUs as they are brought up. */
 117         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 118
 119         gnttab_init();
 120         if (!xen_initial_domain())
 121                 xenbus_probe(NULL);
 122
 123         return 0;
 124 }
 125 core_initcall(xen_guest_init);
 126
 127 static irqreturn_t xen_arm_callback(int irq, void *arg)
 128 {
 129         xen_hvm_evtchn_do_upcall();
 130         return IRQ_HANDLED;
 131 }
 132
 133 static int __init xen_init_events(void)
 134 {
 135         if (!xen_domain() || xen_events_irq < 0)
 136                 return -ENODEV;
 137
 138         xen_init_IRQ();
 139
 140         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
 141                         "events", xen_vcpu)) {
 142                 pr_err("Error requesting IRQ %d\n", xen_events_irq);
 143                 return -EINVAL;
 144         }
 145
 146         enable_percpu_irq(xen_events_irq, 0);
 147
 148         return 0;
 149 }
 150 postcore_initcall(xen_init_events);
 151
 152 /* XXX: only until balloon is properly working */
 153 int alloc_xenballooned_pages(int nr_pages, struct page **pages, bool highmem)
 154 {
 155         *pages = alloc_pages(highmem ? GFP_HIGHUSER : GFP_KERNEL,
 156                         get_order(nr_pages));
 157         if (*pages == NULL)
 158                 return -ENOMEM;
 159         return 0;
 160 }
 161 EXPORT_SYMBOL_GPL(alloc_xenballooned_pages);
 162
 163 void free_xenballooned_pages(int nr_pages, struct page **pages)
 164 {
 165         kfree(*pages);
 166         *pages = NULL;
 167 }
 168 EXPORT_SYMBOL_GPL(free_xenballooned_pages);
 169
 170 /* In the hypervisor.S file. */
 171 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 172 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
 173 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
 174 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
 175 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
 176 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
 177 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 178 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 179 EXPORT_SYMBOL_GPL(privcmd_call);