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