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#include <linux/console.h>
28
29#include <linux/mm.h>
30
31struct start_info _xen_start_info;
32struct start_info *xen_start_info = &_xen_start_info;
33EXPORT_SYMBOL(xen_start_info);
34
35enum xen_domain_type xen_domain_type = XEN_NATIVE;
36EXPORT_SYMBOL(xen_domain_type);
37
38struct shared_info xen_dummy_shared_info;
39struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
40
41DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
42static struct vcpu_info __percpu *xen_vcpu_info;
43
44
45unsigned long xen_released_pages;
46struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
47
48
49__read_mostly int xen_have_vector_callback;
50EXPORT_SYMBOL_GPL(xen_have_vector_callback);
51
52int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
53EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
54
55static __read_mostly unsigned int xen_events_irq;
56
57static __initdata struct device_node *xen_node;
58
59int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
60 unsigned long addr,
61 xen_pfn_t *mfn, int nr,
62 int *err_ptr, pgprot_t prot,
63 unsigned domid,
64 struct page **pages)
65{
66 return xen_xlate_remap_gfn_array(vma, addr, mfn, nr, err_ptr,
67 prot, domid, pages);
68}
69EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
70
71
72int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
73 unsigned long addr,
74 xen_pfn_t mfn, int nr,
75 pgprot_t prot, unsigned domid,
76 struct page **pages)
77{
78 return -ENOSYS;
79}
80EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
81
82int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
83 int nr, struct page **pages)
84{
85 return xen_xlate_unmap_gfn_range(vma, nr, pages);
86}
87EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
88
89static void xen_percpu_init(void)
90{
91 struct vcpu_register_vcpu_info info;
92 struct vcpu_info *vcpup;
93 int err;
94 int cpu = get_cpu();
95
96 pr_info("Xen: initializing cpu%d\n", cpu);
97 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
98
99 info.mfn = __pa(vcpup) >> PAGE_SHIFT;
100 info.offset = offset_in_page(vcpup);
101
102 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
103 BUG_ON(err);
104 per_cpu(xen_vcpu, cpu) = vcpup;
105
106 enable_percpu_irq(xen_events_irq, 0);
107 put_cpu();
108}
109
110static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
111{
112 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
113 int rc;
114 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
115 BUG_ON(rc);
116}
117
118static void xen_power_off(void)
119{
120 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
121 int rc;
122 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
123 BUG_ON(rc);
124}
125
126static int xen_cpu_notification(struct notifier_block *self,
127 unsigned long action,
128 void *hcpu)
129{
130 switch (action) {
131 case CPU_STARTING:
132 xen_percpu_init();
133 break;
134 default:
135 break;
136 }
137
138 return NOTIFY_OK;
139}
140
141static struct notifier_block xen_cpu_notifier = {
142 .notifier_call = xen_cpu_notification,
143};
144
145static irqreturn_t xen_arm_callback(int irq, void *arg)
146{
147 xen_hvm_evtchn_do_upcall();
148 return IRQ_HANDLED;
149}
150
151
152
153
154
155#define GRANT_TABLE_PHYSADDR 0
156void __init xen_early_init(void)
157{
158 int len;
159 const char *s = NULL;
160 const char *version = NULL;
161 const char *xen_prefix = "xen,xen-";
162
163 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
164 if (!xen_node) {
165 pr_debug("No Xen support\n");
166 return;
167 }
168 s = of_get_property(xen_node, "compatible", &len);
169 if (strlen(xen_prefix) + 3 < len &&
170 !strncmp(xen_prefix, s, strlen(xen_prefix)))
171 version = s + strlen(xen_prefix);
172 if (version == NULL) {
173 pr_debug("Xen version not found\n");
174 return;
175 }
176
177 pr_info("Xen %s support found\n", version);
178
179 xen_domain_type = XEN_HVM_DOMAIN;
180
181 xen_setup_features();
182
183 if (xen_feature(XENFEAT_dom0))
184 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
185 else
186 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
187
188 if (!console_set_on_cmdline && !xen_initial_domain())
189 add_preferred_console("hvc", 0, NULL);
190}
191
192static int __init xen_guest_init(void)
193{
194 struct xen_add_to_physmap xatp;
195 struct shared_info *shared_info_page = NULL;
196 struct resource res;
197 phys_addr_t grant_frames;
198
199 if (!xen_domain())
200 return 0;
201
202 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
203 pr_err("Xen grant table base address not found\n");
204 return -ENODEV;
205 }
206 grant_frames = res.start;
207
208 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
209 if (!xen_events_irq) {
210 pr_err("Xen event channel interrupt not found\n");
211 return -ENODEV;
212 }
213
214 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
215
216 if (!shared_info_page) {
217 pr_err("not enough memory\n");
218 return -ENOMEM;
219 }
220 xatp.domid = DOMID_SELF;
221 xatp.idx = 0;
222 xatp.space = XENMAPSPACE_shared_info;
223 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
224 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
225 BUG();
226
227 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
228
229
230
231
232
233
234
235
236
237 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
238 sizeof(struct vcpu_info));
239 if (xen_vcpu_info == NULL)
240 return -ENOMEM;
241
242 if (gnttab_setup_auto_xlat_frames(grant_frames)) {
243 free_percpu(xen_vcpu_info);
244 return -ENOMEM;
245 }
246 gnttab_init();
247 if (!xen_initial_domain())
248 xenbus_probe(NULL);
249
250
251
252
253
254 disable_cpuidle();
255 disable_cpufreq();
256
257 xen_init_IRQ();
258
259 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
260 "events", &xen_vcpu)) {
261 pr_err("Error request IRQ %d\n", xen_events_irq);
262 return -EINVAL;
263 }
264
265 xen_percpu_init();
266
267 register_cpu_notifier(&xen_cpu_notifier);
268
269 return 0;
270}
271early_initcall(xen_guest_init);
272
273static int __init xen_pm_init(void)
274{
275 if (!xen_domain())
276 return -ENODEV;
277
278 pm_power_off = xen_power_off;
279 arm_pm_restart = xen_restart;
280
281 return 0;
282}
283late_initcall(xen_pm_init);
284
285
286
287void xen_arch_pre_suspend(void) { }
288void xen_arch_post_suspend(int suspend_cancelled) { }
289void xen_timer_resume(void) { }
290void xen_arch_resume(void) { }
291void xen_arch_suspend(void) { }
292
293
294
295EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
296EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
297EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
298EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
299EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
300EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
301EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
302EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
303EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
304EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
305EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
306EXPORT_SYMBOL_GPL(privcmd_call);
307
