unsigned long xc_make_page_below_4G( xc_interface *xch, uint32_t domid, unsigned long mfn) { xen_pfn_t old_mfn = mfn; xen_pfn_t new_mfn; if ( xc_domain_decrease_reservation_exact( xch, domid, 1, 0, &old_mfn) != 0 ) { DPRINTF("xc_make_page_below_4G decrease failed. mfn=%lx\n",mfn); return 0; } if ( xc_domain_increase_reservation_exact( xch, domid, 1, 0, XENMEMF_address_bits(32), &new_mfn) != 0 ) { DPRINTF("xc_make_page_below_4G increase failed. mfn=%lx\n",mfn); return 0; } return new_mfn; }
void *xc_vm_event_enable(xc_interface *xch, domid_t domain_id, int param, uint32_t *port) { void *ring_page = NULL; uint64_t pfn; xen_pfn_t ring_pfn, mmap_pfn; unsigned int op, mode; int rc1, rc2, saved_errno; if ( !port ) { errno = EINVAL; return NULL; } /* Pause the domain for ring page setup */ rc1 = xc_domain_pause(xch, domain_id); if ( rc1 != 0 ) { PERROR("Unable to pause domain\n"); return NULL; } /* Get the pfn of the ring page */ rc1 = xc_hvm_param_get(xch, domain_id, param, &pfn); if ( rc1 != 0 ) { PERROR("Failed to get pfn of ring page\n"); goto out; } ring_pfn = pfn; mmap_pfn = pfn; rc1 = xc_get_pfn_type_batch(xch, domain_id, 1, &mmap_pfn); if ( rc1 || mmap_pfn & XEN_DOMCTL_PFINFO_XTAB ) { /* Page not in the physmap, try to populate it */ rc1 = xc_domain_populate_physmap_exact(xch, domain_id, 1, 0, 0, &ring_pfn); if ( rc1 != 0 ) { PERROR("Failed to populate ring pfn\n"); goto out; } } mmap_pfn = ring_pfn; ring_page = xc_map_foreign_pages(xch, domain_id, PROT_READ | PROT_WRITE, &mmap_pfn, 1); if ( !ring_page ) { PERROR("Could not map the ring page\n"); goto out; } switch ( param ) { case HVM_PARAM_PAGING_RING_PFN: op = XEN_VM_EVENT_ENABLE; mode = XEN_DOMCTL_VM_EVENT_OP_PAGING; break; case HVM_PARAM_MONITOR_RING_PFN: op = XEN_VM_EVENT_ENABLE; mode = XEN_DOMCTL_VM_EVENT_OP_MONITOR; break; case HVM_PARAM_SHARING_RING_PFN: op = XEN_VM_EVENT_ENABLE; mode = XEN_DOMCTL_VM_EVENT_OP_SHARING; break; /* * This is for the outside chance that the HVM_PARAM is valid but is invalid * as far as vm_event goes. */ default: errno = EINVAL; rc1 = -1; goto out; } rc1 = xc_vm_event_control(xch, domain_id, op, mode, port); if ( rc1 != 0 ) { PERROR("Failed to enable vm_event\n"); goto out; } /* Remove the ring_pfn from the guest's physmap */ rc1 = xc_domain_decrease_reservation_exact(xch, domain_id, 1, 0, &ring_pfn); if ( rc1 != 0 ) PERROR("Failed to remove ring page from guest physmap"); out: saved_errno = errno; rc2 = xc_domain_unpause(xch, domain_id); if ( rc1 != 0 || rc2 != 0 ) { if ( rc2 != 0 ) { if ( rc1 == 0 ) saved_errno = errno; PERROR("Unable to unpause domain"); } if ( ring_page ) xenforeignmemory_unmap(xch->fmem, ring_page, 1); ring_page = NULL; errno = saved_errno; } return ring_page; }