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 <xen/page.h> 12 #include <xen/xen-ops.h> 13 #include <asm/xen/hypervisor.h> 14 #include <asm/xen/hypercall.h> 15 #include <linux/interrupt.h> 16 #include <linux/irqreturn.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/of_irq.h> 20 #include <linux/of_address.h> 21 22 #include <linux/mm.h> 23 24 struct start_info _xen_start_info; 25 struct start_info *xen_start_info = &_xen_start_info; 26 EXPORT_SYMBOL_GPL(xen_start_info); 27 28 enum xen_domain_type xen_domain_type = XEN_NATIVE; 29 EXPORT_SYMBOL_GPL(xen_domain_type); 30 31 struct shared_info xen_dummy_shared_info; 32 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; 33 34 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); 35 36 /* These are unused until we support booting "pre-ballooned" */ 37 unsigned long xen_released_pages; 38 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; 39 40 /* TODO: to be removed */ 41 __read_mostly int xen_have_vector_callback; 42 EXPORT_SYMBOL_GPL(xen_have_vector_callback); 43 44 int xen_platform_pci_unplug = XEN_UNPLUG_ALL; 45 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug); 46 47 static __read_mostly int xen_events_irq = -1; 48 49 /* map fgmfn of domid to lpfn in the current domain */ 50 static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn, 51 unsigned int domid) 52 { 53 int rc; 54 struct xen_add_to_physmap_range xatp = { 55 .domid = DOMID_SELF, 56 .foreign_domid = domid, 57 .size = 1, 58 .space = XENMAPSPACE_gmfn_foreign, 59 }; 60 xen_ulong_t idx = fgmfn; 61 xen_pfn_t gpfn = lpfn; 62 63 set_xen_guest_handle(xatp.idxs, &idx); 64 set_xen_guest_handle(xatp.gpfns, &gpfn); 65 66 rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp); 67 if (rc) { 68 pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n", 69 rc, lpfn, fgmfn); 70 return 1; 71 } 72 return 0; 73 } 74 75 struct remap_data { 76 xen_pfn_t fgmfn; /* foreign domain's gmfn */ 77 pgprot_t prot; 78 domid_t domid; 79 struct vm_area_struct *vma; 80 int index; 81 struct page **pages; 82 struct xen_remap_mfn_info *info; 83 }; 84 85 static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr, 86 void *data) 87 { 88 struct remap_data *info = data; 89 struct page *page = info->pages[info->index++]; 90 unsigned long pfn = page_to_pfn(page); 91 pte_t pte = pfn_pte(pfn, info->prot); 92 93 if (map_foreign_page(pfn, info->fgmfn, info->domid)) 94 return -EFAULT; 95 set_pte_at(info->vma->vm_mm, addr, ptep, pte); 96 97 return 0; 98 } 99 100 int xen_remap_domain_mfn_range(struct vm_area_struct *vma, 101 unsigned long addr, 102 xen_pfn_t mfn, int nr, 103 pgprot_t prot, unsigned domid, 104 struct page **pages) 105 { 106 int err; 107 struct remap_data data; 108 109 /* TBD: Batching, current sole caller only does page at a time */ 110 if (nr > 1) 111 return -EINVAL; 112 113 data.fgmfn = mfn; 114 data.prot = prot; 115 data.domid = domid; 116 data.vma = vma; 117 data.index = 0; 118 data.pages = pages; 119 err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT, 120 remap_pte_fn, &data); 121 return err; 122 } 123 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); 124 125 int xen_unmap_domain_mfn_range(struct vm_area_struct *vma, 126 int nr, struct page **pages) 127 { 128 int i; 129 130 for (i = 0; i < nr; i++) { 131 struct xen_remove_from_physmap xrp; 132 unsigned long rc, pfn; 133 134 pfn = page_to_pfn(pages[i]); 135 136 xrp.domid = DOMID_SELF; 137 xrp.gpfn = pfn; 138 rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp); 139 if (rc) { 140 pr_warn("Failed to unmap pfn:%lx rc:%ld\n", 141 pfn, rc); 142 return rc; 143 } 144 } 145 return 0; 146 } 147 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range); 148 149 /* 150 * see Documentation/devicetree/bindings/arm/xen.txt for the 151 * documentation of the Xen Device Tree format. 152 */ 153 #define GRANT_TABLE_PHYSADDR 0 154 static int __init xen_guest_init(void) 155 { 156 struct xen_add_to_physmap xatp; 157 static struct shared_info *shared_info_page = 0; 158 struct device_node *node; 159 int len; 160 const char *s = NULL; 161 const char *version = NULL; 162 const char *xen_prefix = "xen,xen-"; 163 struct resource res; 164 165 node = of_find_compatible_node(NULL, NULL, "xen,xen"); 166 if (!node) { 167 pr_debug("No Xen support\n"); 168 return 0; 169 } 170 s = of_get_property(node, "compatible", &len); 171 if (strlen(xen_prefix) + 3 < len && 172 !strncmp(xen_prefix, s, strlen(xen_prefix))) 173 version = s + strlen(xen_prefix); 174 if (version == NULL) { 175 pr_debug("Xen version not found\n"); 176 return 0; 177 } 178 if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) 179 return 0; 180 xen_hvm_resume_frames = res.start >> PAGE_SHIFT; 181 xen_events_irq = irq_of_parse_and_map(node, 0); 182 pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n", 183 version, xen_events_irq, xen_hvm_resume_frames); 184 xen_domain_type = XEN_HVM_DOMAIN; 185 186 xen_setup_features(); 187 if (xen_feature(XENFEAT_dom0)) 188 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; 189 else 190 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); 191 192 if (!shared_info_page) 193 shared_info_page = (struct shared_info *) 194 get_zeroed_page(GFP_KERNEL); 195 if (!shared_info_page) { 196 pr_err("not enough memory\n"); 197 return -ENOMEM; 198 } 199 xatp.domid = DOMID_SELF; 200 xatp.idx = 0; 201 xatp.space = XENMAPSPACE_shared_info; 202 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; 203 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 204 BUG(); 205 206 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; 207 208 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info 209 * page, we use it in the event channel upcall and in some pvclock 210 * related functions. We don't need the vcpu_info placement 211 * optimizations because we don't use any pv_mmu or pv_irq op on 212 * HVM. 213 * The shared info contains exactly 1 CPU (the boot CPU). The guest 214 * is required to use VCPUOP_register_vcpu_info to place vcpu info 215 * for secondary CPUs as they are brought up. */ 216 per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; 217 218 gnttab_init(); 219 if (!xen_initial_domain()) 220 xenbus_probe(NULL); 221 222 return 0; 223 } 224 core_initcall(xen_guest_init); 225 226 static irqreturn_t xen_arm_callback(int irq, void *arg) 227 { 228 xen_hvm_evtchn_do_upcall(); 229 return IRQ_HANDLED; 230 } 231 232 static int __init xen_init_events(void) 233 { 234 if (!xen_domain() || xen_events_irq < 0) 235 return -ENODEV; 236 237 xen_init_IRQ(); 238 239 if (request_percpu_irq(xen_events_irq, xen_arm_callback, 240 "events", xen_vcpu)) { 241 pr_err("Error requesting IRQ %d\n", xen_events_irq); 242 return -EINVAL; 243 } 244 245 enable_percpu_irq(xen_events_irq, 0); 246 247 return 0; 248 } 249 postcore_initcall(xen_init_events); 250 251 /* In the hypervisor.S file. */ 252 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op); 253 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op); 254 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version); 255 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io); 256 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op); 257 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op); 258 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op); 259 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op); 260 EXPORT_SYMBOL_GPL(privcmd_call); 261