2 #include <xen/events.h>
3 #include <xen/grant_table.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>
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>
22 #include <linux/of_irq.h>
23 #include <linux/of_address.h>
27 struct start_info _xen_start_info;
28 struct start_info *xen_start_info = &_xen_start_info;
29 EXPORT_SYMBOL_GPL(xen_start_info);
31 enum xen_domain_type xen_domain_type = XEN_NATIVE;
32 EXPORT_SYMBOL_GPL(xen_domain_type);
34 struct shared_info xen_dummy_shared_info;
35 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
37 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
38 static struct vcpu_info __percpu *xen_vcpu_info;
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;
44 /* TODO: to be removed */
45 __read_mostly int xen_have_vector_callback;
46 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
48 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
49 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
51 static __read_mostly int xen_events_irq = -1;
53 /* map fgmfn of domid to lpfn in the current domain */
54 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
58 struct xen_add_to_physmap_range xatp = {
60 .foreign_domid = domid,
62 .space = XENMAPSPACE_gmfn_foreign,
64 xen_ulong_t idx = fgmfn;
65 xen_pfn_t gpfn = lpfn;
68 set_xen_guest_handle(xatp.idxs, &idx);
69 set_xen_guest_handle(xatp.gpfns, &gpfn);
70 set_xen_guest_handle(xatp.errs, &err);
72 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
74 pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
75 rc, err, lpfn, fgmfn);
82 xen_pfn_t fgmfn; /* foreign domain's gmfn */
85 struct vm_area_struct *vma;
88 struct xen_remap_mfn_info *info;
91 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
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);
99 if (map_foreign_page(pfn, info->fgmfn, info->domid))
101 set_pte_at(info->vma->vm_mm, addr, ptep, pte);
106 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
108 xen_pfn_t mfn, int nr,
109 pgprot_t prot, unsigned domid,
113 struct remap_data data;
115 /* TBD: Batching, current sole caller only does page at a time */
125 err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
126 remap_pte_fn, &data);
129 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
131 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
132 int nr, struct page **pages)
136 for (i = 0; i < nr; i++) {
137 struct xen_remove_from_physmap xrp;
138 unsigned long rc, pfn;
140 pfn = page_to_pfn(pages[i]);
142 xrp.domid = DOMID_SELF;
144 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
146 pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
153 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
155 static int __init xen_secondary_init(unsigned int cpu)
157 struct vcpu_register_vcpu_info info;
158 struct vcpu_info *vcpup;
161 pr_info("Xen: initializing cpu%d\n", cpu);
162 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
164 info.mfn = __pa(vcpup) >> PAGE_SHIFT;
165 info.offset = offset_in_page(vcpup);
167 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
169 pr_debug("register_vcpu_info failed: err=%d\n", err);
171 /* This cpu is using the registered vcpu info, even if
172 later ones fail to. */
173 per_cpu(xen_vcpu, cpu) = vcpup;
178 static void xen_restart(char str, const char *cmd)
180 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
182 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
187 static void xen_power_off(void)
189 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
191 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
197 * see Documentation/devicetree/bindings/arm/xen.txt for the
198 * documentation of the Xen Device Tree format.
200 #define GRANT_TABLE_PHYSADDR 0
201 static int __init xen_guest_init(void)
203 struct xen_add_to_physmap xatp;
204 static struct shared_info *shared_info_page = 0;
205 struct device_node *node;
207 const char *s = NULL;
208 const char *version = NULL;
209 const char *xen_prefix = "xen,xen-";
213 node = of_find_compatible_node(NULL, NULL, "xen,xen");
215 pr_debug("No Xen support\n");
218 s = of_get_property(node, "compatible", &len);
219 if (strlen(xen_prefix) + 3 < len &&
220 !strncmp(xen_prefix, s, strlen(xen_prefix)))
221 version = s + strlen(xen_prefix);
222 if (version == NULL) {
223 pr_debug("Xen version not found\n");
226 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
228 xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
229 xen_events_irq = irq_of_parse_and_map(node, 0);
230 pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
231 version, xen_events_irq, xen_hvm_resume_frames);
232 xen_domain_type = XEN_HVM_DOMAIN;
234 xen_setup_features();
235 if (xen_feature(XENFEAT_dom0))
236 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
238 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
240 if (!shared_info_page)
241 shared_info_page = (struct shared_info *)
242 get_zeroed_page(GFP_KERNEL);
243 if (!shared_info_page) {
244 pr_err("not enough memory\n");
247 xatp.domid = DOMID_SELF;
249 xatp.space = XENMAPSPACE_shared_info;
250 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
251 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
254 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
256 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
257 * page, we use it in the event channel upcall and in some pvclock
259 * The shared info contains exactly 1 CPU (the boot CPU). The guest
260 * is required to use VCPUOP_register_vcpu_info to place vcpu info
261 * for secondary CPUs as they are brought up.
262 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
264 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
265 sizeof(struct vcpu_info));
266 if (xen_vcpu_info == NULL)
268 for_each_online_cpu(i)
269 xen_secondary_init(i);
272 if (!xen_initial_domain())
275 pm_power_off = xen_power_off;
276 arm_pm_restart = xen_restart;
280 core_initcall(xen_guest_init);
282 static irqreturn_t xen_arm_callback(int irq, void *arg)
284 xen_hvm_evtchn_do_upcall();
288 static __init void xen_percpu_enable_events(void *unused)
290 enable_percpu_irq(xen_events_irq, 0);
293 static int __init xen_init_events(void)
295 if (!xen_domain() || xen_events_irq < 0)
300 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
301 "events", &xen_vcpu)) {
302 pr_err("Error requesting IRQ %d\n", xen_events_irq);
306 on_each_cpu(xen_percpu_enable_events, NULL, 0);
310 postcore_initcall(xen_init_events);
312 /* In the hypervisor.S file. */
313 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
314 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
315 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
316 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
317 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
318 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
319 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
320 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
321 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
322 EXPORT_SYMBOL_GPL(privcmd_call);