Linux Kernel  3.7.1
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enlighten.c
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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>
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 
22 EXPORT_SYMBOL_GPL(xen_start_info);
23 
26 
29 
30 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
31 
32 /* TODO: to be removed */
35 
38 
39 static __read_mostly int xen_events_irq = -1;
40 
42  unsigned long addr,
43  unsigned long mfn, int nr,
44  pgprot_t prot, unsigned domid)
45 {
46  return -ENOSYS;
47 }
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  }
80  return 0;
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);
86 
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 *)
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;
103  xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
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())
122 
123  return 0;
124 }
125 core_initcall(xen_guest_init);
126 
127 static irqreturn_t xen_arm_callback(int irq, void *arg)
128 {
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 }
162 
163 void free_xenballooned_pages(int nr_pages, struct page **pages)
164 {
165  kfree(*pages);
166  *pages = NULL;
167 }
169 
170 /* In the hypervisor.S file. */