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
27struct start_info _xen_start_info;
28struct start_info *xen_start_info = &_xen_start_info;
29EXPORT_SYMBOL_GPL(xen_start_info);
30
31enum xen_domain_type xen_domain_type = XEN_NATIVE;
32EXPORT_SYMBOL_GPL(xen_domain_type);
33
34struct shared_info xen_dummy_shared_info;
35struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
36
37DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
38static struct vcpu_info __percpu *xen_vcpu_info;
39
40
41unsigned long xen_released_pages;
42struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
43
44
45__read_mostly int xen_have_vector_callback;
46EXPORT_SYMBOL_GPL(xen_have_vector_callback);
47
48int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
49EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
50
51static __read_mostly int xen_events_irq = -1;
52
53
54static 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
81struct remap_data {
82 xen_pfn_t fgmfn;
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
91static 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
106int 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
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}
129EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
130
131int 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}
153EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
154
155static 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}
174
175static void xen_restart(char str, const char *cmd)
176{
177 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
178 int rc;
179 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
180 if (rc)
181 BUG();
182}
183
184static void xen_power_off(void)
185{
186 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
187 int rc;
188 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
189 if (rc)
190 BUG();
191}
192
193
194
195
196
197#define GRANT_TABLE_PHYSADDR 0
198static int __init xen_guest_init(void)
199{
200 struct xen_add_to_physmap xatp;
201 static struct shared_info *shared_info_page = 0;
202 struct device_node *node;
203 int len;
204 const char *s = NULL;
205 const char *version = NULL;
206 const char *xen_prefix = "xen,xen-";
207 struct resource res;
208
209 node = of_find_compatible_node(NULL, NULL, "xen,xen");
210 if (!node) {
211 pr_debug("No Xen support\n");
212 return 0;
213 }
214 s = of_get_property(node, "compatible", &len);
215 if (strlen(xen_prefix) + 3 < len &&
216 !strncmp(xen_prefix, s, strlen(xen_prefix)))
217 version = s + strlen(xen_prefix);
218 if (version == NULL) {
219 pr_debug("Xen version not found\n");
220 return 0;
221 }
222 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
223 return 0;
224 xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
225 xen_events_irq = irq_of_parse_and_map(node, 0);
226 pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
227 version, xen_events_irq, xen_hvm_resume_frames);
228 xen_domain_type = XEN_HVM_DOMAIN;
229
230 xen_setup_features();
231 if (xen_feature(XENFEAT_dom0))
232 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
233 else
234 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
235
236 if (!shared_info_page)
237 shared_info_page = (struct shared_info *)
238 get_zeroed_page(GFP_KERNEL);
239 if (!shared_info_page) {
240 pr_err("not enough memory\n");
241 return -ENOMEM;
242 }
243 xatp.domid = DOMID_SELF;
244 xatp.idx = 0;
245 xatp.space = XENMAPSPACE_shared_info;
246 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
247 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
248 BUG();
249
250 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
251
252
253
254
255
256
257
258
259
260 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
261 sizeof(struct vcpu_info));
262 if (xen_vcpu_info == NULL)
263 return -ENOMEM;
264
265 gnttab_init();
266 if (!xen_initial_domain())
267 xenbus_probe(NULL);
268
269 return 0;
270}
271core_initcall(xen_guest_init);
272
273static int __init xen_pm_init(void)
274{
275 pm_power_off = xen_power_off;
276 arm_pm_restart = xen_restart;
277
278 return 0;
279}
280subsys_initcall(xen_pm_init);
281
282static irqreturn_t xen_arm_callback(int irq, void *arg)
283{
284 xen_hvm_evtchn_do_upcall();
285 return IRQ_HANDLED;
286}
287
288static int __init xen_init_events(void)
289{
290 if (!xen_domain() || xen_events_irq < 0)
291 return -ENODEV;
292
293 xen_init_IRQ();
294
295 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
296 "events", &xen_vcpu)) {
297 pr_err("Error requesting IRQ %d\n", xen_events_irq);
298 return -EINVAL;
299 }
300
301 on_each_cpu(xen_percpu_init, NULL, 0);
302
303 return 0;
304}
305postcore_initcall(xen_init_events);
306
307
308EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
309EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
310EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
311EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
312EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
313EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
314EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
315EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
316EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
317EXPORT_SYMBOL_GPL(privcmd_call);
318
