1 /* 2 * Copyright (C) 2014 Citrix Systems UK Ltd. 3 * 4 * This work is licensed under the terms of the GNU GPL, version 2. See 5 * the COPYING file in the top-level directory. 6 * 7 * Contributions after 2012-01-13 are licensed under the terms of the 8 * GNU GPL, version 2 or (at your option) any later version. 9 */ 10 11 #include "qemu/osdep.h" 12 #include "hw/xen/xen_backend.h" 13 #include "qmp-commands.h" 14 #include "sysemu/char.h" 15 #include "sysemu/accel.h" 16 #include "migration/migration.h" 17 18 //#define DEBUG_XEN 19 20 #ifdef DEBUG_XEN 21 #define DPRINTF(fmt, ...) \ 22 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) 23 #else 24 #define DPRINTF(fmt, ...) \ 25 do { } while (0) 26 #endif 27 28 static int store_dev_info(int domid, Chardev *cs, const char *string) 29 { 30 struct xs_handle *xs = NULL; 31 char *path = NULL; 32 char *newpath = NULL; 33 char *pts = NULL; 34 int ret = -1; 35 36 /* Only continue if we're talking to a pty. */ 37 if (strncmp(cs->filename, "pty:", 4)) { 38 return 0; 39 } 40 pts = cs->filename + 4; 41 42 /* We now have everything we need to set the xenstore entry. */ 43 xs = xs_open(0); 44 if (xs == NULL) { 45 fprintf(stderr, "Could not contact XenStore\n"); 46 goto out; 47 } 48 49 path = xs_get_domain_path(xs, domid); 50 if (path == NULL) { 51 fprintf(stderr, "xs_get_domain_path() error\n"); 52 goto out; 53 } 54 newpath = realloc(path, (strlen(path) + strlen(string) + 55 strlen("/tty") + 1)); 56 if (newpath == NULL) { 57 fprintf(stderr, "realloc error\n"); 58 goto out; 59 } 60 path = newpath; 61 62 strcat(path, string); 63 strcat(path, "/tty"); 64 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 65 fprintf(stderr, "xs_write for '%s' fail", string); 66 goto out; 67 } 68 ret = 0; 69 70 out: 71 free(path); 72 xs_close(xs); 73 74 return ret; 75 } 76 77 void xenstore_store_pv_console_info(int i, Chardev *chr) 78 { 79 if (i == 0) { 80 store_dev_info(xen_domid, chr, "/console"); 81 } else { 82 char buf[32]; 83 snprintf(buf, sizeof(buf), "/device/console/%d", i); 84 store_dev_info(xen_domid, chr, buf); 85 } 86 } 87 88 89 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 90 { 91 char path[50]; 92 93 if (xs == NULL) { 94 fprintf(stderr, "xenstore connection not initialized\n"); 95 exit(1); 96 } 97 98 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 99 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { 100 fprintf(stderr, "error recording dm state\n"); 101 exit(1); 102 } 103 } 104 105 106 static void xen_change_state_handler(void *opaque, int running, 107 RunState state) 108 { 109 if (running) { 110 /* record state running */ 111 xenstore_record_dm_state(xenstore, "running"); 112 } 113 } 114 115 static int xen_init(MachineState *ms) 116 { 117 xen_xc = xc_interface_open(0, 0, 0); 118 if (xen_xc == NULL) { 119 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 120 return -1; 121 } 122 xen_fmem = xenforeignmemory_open(0, 0); 123 if (xen_fmem == NULL) { 124 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 125 xc_interface_close(xen_xc); 126 return -1; 127 } 128 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 129 130 global_state_set_optional(); 131 savevm_skip_configuration(); 132 savevm_skip_section_footers(); 133 134 return 0; 135 } 136 137 static void xen_accel_class_init(ObjectClass *oc, void *data) 138 { 139 AccelClass *ac = ACCEL_CLASS(oc); 140 ac->name = "Xen"; 141 ac->init_machine = xen_init; 142 ac->allowed = &xen_allowed; 143 } 144 145 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 146 147 static const TypeInfo xen_accel_type = { 148 .name = TYPE_XEN_ACCEL, 149 .parent = TYPE_ACCEL, 150 .class_init = xen_accel_class_init, 151 }; 152 153 static void xen_type_init(void) 154 { 155 type_register_static(&xen_accel_type); 156 } 157 158 type_init(xen_type_init); 159