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#include <xen/xen.h> #include <xen/events.h> #include <xen/grant_table.h> #include <xen/hvm.h> #include <xen/interface/xen.h> #include <xen/interface/memory.h> #include <xen/interface/hvm/params.h> #include <xen/features.h> #include <xen/platform_pci.h> #include <xen/xenbus.h> #include <xen/page.h> #include <asm/xen/hypervisor.h> #include <asm/xen/hypercall.h> #include <linux/interrupt.h> #include <linux/irqreturn.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/of_address.h> struct start_info _xen_start_info; struct start_info *xen_start_info = &_xen_start_info; EXPORT_SYMBOL_GPL(xen_start_info); enum xen_domain_type xen_domain_type = XEN_NATIVE; EXPORT_SYMBOL_GPL(xen_domain_type); struct shared_info xen_dummy_shared_info; struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); /* These are unused until we support booting "pre-ballooned" */ unsigned long xen_released_pages; struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; /* TODO: to be removed */ __read_mostly int xen_have_vector_callback; EXPORT_SYMBOL_GPL(xen_have_vector_callback); int xen_platform_pci_unplug = XEN_UNPLUG_ALL; EXPORT_SYMBOL_GPL(xen_platform_pci_unplug); static __read_mostly int xen_events_irq = -1; int xen_remap_domain_mfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long mfn, int nr, pgprot_t prot, unsigned domid) { return -ENOSYS; } EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); /* * see Documentation/devicetree/bindings/arm/xen.txt for the * documentation of the Xen Device Tree format. */ #define GRANT_TABLE_PHYSADDR 0 static int __init xen_guest_init(void) { struct xen_add_to_physmap xatp; static struct shared_info *shared_info_page = 0; struct device_node *node; int len; const char *s = NULL; const char *version = NULL; const char *xen_prefix = "xen,xen-"; struct resource res; node = of_find_compatible_node(NULL, NULL, "xen,xen"); if (!node) { pr_debug("No Xen support\n"); return 0; } s = of_get_property(node, "compatible", &len); if (strlen(xen_prefix) + 3 < len && !strncmp(xen_prefix, s, strlen(xen_prefix))) version = s + strlen(xen_prefix); if (version == NULL) { pr_debug("Xen version not found\n"); return 0; } if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) return 0; xen_hvm_resume_frames = res.start >> PAGE_SHIFT; xen_events_irq = irq_of_parse_and_map(node, 0); pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n", version, xen_events_irq, xen_hvm_resume_frames); xen_domain_type = XEN_HVM_DOMAIN; xen_setup_features(); if (xen_feature(XENFEAT_dom0)) xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED; else xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED); if (!shared_info_page) shared_info_page = (struct shared_info *) get_zeroed_page(GFP_KERNEL); if (!shared_info_page) { pr_err("not enough memory\n"); return -ENOMEM; } xatp.domid = DOMID_SELF; xatp.idx = 0; xatp.space = XENMAPSPACE_shared_info; xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) BUG(); HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info * page, we use it in the event channel upcall and in some pvclock * related functions. We don't need the vcpu_info placement * optimizations because we don't use any pv_mmu or pv_irq op on * HVM. * The shared info contains exactly 1 CPU (the boot CPU). The guest * is required to use VCPUOP_register_vcpu_info to place vcpu info * for secondary CPUs as they are brought up. */ per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; gnttab_init(); if (!xen_initial_domain()) xenbus_probe(NULL); return 0; } core_initcall(xen_guest_init); static irqreturn_t xen_arm_callback(int irq, void *arg) { xen_hvm_evtchn_do_upcall(); return IRQ_HANDLED; } static int __init xen_init_events(void) { if (!xen_domain() || xen_events_irq < 0) return -ENODEV; xen_init_IRQ(); if (request_percpu_irq(xen_events_irq, xen_arm_callback, "events", xen_vcpu)) { pr_err("Error requesting IRQ %d\n", xen_events_irq); return -EINVAL; } enable_percpu_irq(xen_events_irq, 0); return 0; } postcore_initcall(xen_init_events);
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