forked from Minki/linux
319 lines
8.1 KiB
C
319 lines
8.1 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/vcpu.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 <xen/page.h>
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#include <xen/interface/sched.h>
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#include <xen/xen-ops.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <asm/system_misc.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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#include <linux/mm.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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static struct vcpu_info __percpu *xen_vcpu_info;
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/* These are unused until we support booting "pre-ballooned" */
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unsigned long xen_released_pages;
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struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
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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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/* map fgmfn of domid to lpfn in the current domain */
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static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
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unsigned int domid)
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{
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int rc;
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struct xen_add_to_physmap_range xatp = {
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.domid = DOMID_SELF,
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.foreign_domid = domid,
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.size = 1,
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.space = XENMAPSPACE_gmfn_foreign,
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};
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xen_ulong_t idx = fgmfn;
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xen_pfn_t gpfn = lpfn;
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int err = 0;
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set_xen_guest_handle(xatp.idxs, &idx);
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set_xen_guest_handle(xatp.gpfns, &gpfn);
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set_xen_guest_handle(xatp.errs, &err);
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rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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if (rc || err) {
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pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
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rc, err, lpfn, fgmfn);
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return 1;
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}
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return 0;
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}
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struct remap_data {
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xen_pfn_t fgmfn; /* foreign domain's gmfn */
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pgprot_t prot;
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domid_t domid;
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struct vm_area_struct *vma;
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int index;
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struct page **pages;
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struct xen_remap_mfn_info *info;
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};
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static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
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void *data)
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{
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struct remap_data *info = data;
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struct page *page = info->pages[info->index++];
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unsigned long pfn = page_to_pfn(page);
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pte_t pte = pfn_pte(pfn, info->prot);
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if (map_foreign_page(pfn, info->fgmfn, info->domid))
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return -EFAULT;
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set_pte_at(info->vma->vm_mm, addr, ptep, pte);
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return 0;
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}
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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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xen_pfn_t mfn, int nr,
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pgprot_t prot, unsigned domid,
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struct page **pages)
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{
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int err;
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struct remap_data data;
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/* TBD: Batching, current sole caller only does page at a time */
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if (nr > 1)
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return -EINVAL;
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data.fgmfn = mfn;
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data.prot = prot;
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data.domid = domid;
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data.vma = vma;
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data.index = 0;
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data.pages = pages;
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err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
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remap_pte_fn, &data);
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return err;
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
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int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages)
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{
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int i;
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for (i = 0; i < nr; i++) {
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struct xen_remove_from_physmap xrp;
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unsigned long rc, pfn;
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pfn = page_to_pfn(pages[i]);
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xrp.domid = DOMID_SELF;
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xrp.gpfn = pfn;
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rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
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if (rc) {
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pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
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pfn, rc);
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return rc;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
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static void __init xen_percpu_init(void *unused)
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{
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struct vcpu_register_vcpu_info info;
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struct vcpu_info *vcpup;
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int err;
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int cpu = get_cpu();
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pr_info("Xen: initializing cpu%d\n", cpu);
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vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
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info.mfn = __pa(vcpup) >> PAGE_SHIFT;
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info.offset = offset_in_page(vcpup);
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err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
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BUG_ON(err);
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per_cpu(xen_vcpu, cpu) = vcpup;
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enable_percpu_irq(xen_events_irq, 0);
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}
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static void xen_restart(char str, const char *cmd)
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{
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struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
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int rc;
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rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
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if (rc)
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BUG();
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}
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static void xen_power_off(void)
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{
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struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
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int rc;
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rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
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if (rc)
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BUG();
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}
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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.
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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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* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
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*/
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xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
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sizeof(struct vcpu_info));
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if (xen_vcpu_info == NULL)
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return -ENOMEM;
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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 int __init xen_pm_init(void)
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{
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pm_power_off = xen_power_off;
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arm_pm_restart = xen_restart;
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return 0;
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}
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subsys_initcall(xen_pm_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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on_each_cpu(xen_percpu_init, NULL, 0);
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return 0;
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}
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postcore_initcall(xen_init_events);
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/* In the hypervisor.S file. */
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EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
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EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
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EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
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EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
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EXPORT_SYMBOL_GPL(privcmd_call);
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