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 xc_interface *xen_xc; 29 xenforeignmemory_handle *xen_fmem; 30 31 static int store_dev_info(int domid, Chardev *cs, const char *string) 32 { 33 struct xs_handle *xs = NULL; 34 char *path = NULL; 35 char *newpath = NULL; 36 char *pts = NULL; 37 int ret = -1; 38 39 /* Only continue if we're talking to a pty. */ 40 if (strncmp(cs->filename, "pty:", 4)) { 41 return 0; 42 } 43 pts = cs->filename + 4; 44 45 /* We now have everything we need to set the xenstore entry. */ 46 xs = xs_open(0); 47 if (xs == NULL) { 48 fprintf(stderr, "Could not contact XenStore\n"); 49 goto out; 50 } 51 52 path = xs_get_domain_path(xs, domid); 53 if (path == NULL) { 54 fprintf(stderr, "xs_get_domain_path() error\n"); 55 goto out; 56 } 57 newpath = realloc(path, (strlen(path) + strlen(string) + 58 strlen("/tty") + 1)); 59 if (newpath == NULL) { 60 fprintf(stderr, "realloc error\n"); 61 goto out; 62 } 63 path = newpath; 64 65 strcat(path, string); 66 strcat(path, "/tty"); 67 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 68 fprintf(stderr, "xs_write for '%s' fail", string); 69 goto out; 70 } 71 ret = 0; 72 73 out: 74 free(path); 75 xs_close(xs); 76 77 return ret; 78 } 79 80 void xenstore_store_pv_console_info(int i, Chardev *chr) 81 { 82 if (i == 0) { 83 store_dev_info(xen_domid, chr, "/console"); 84 } else { 85 char buf[32]; 86 snprintf(buf, sizeof(buf), "/device/console/%d", i); 87 store_dev_info(xen_domid, chr, buf); 88 } 89 } 90 91 92 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 93 { 94 char path[50]; 95 96 if (xs == NULL) { 97 fprintf(stderr, "xenstore connection not initialized\n"); 98 exit(1); 99 } 100 101 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 102 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { 103 fprintf(stderr, "error recording dm state\n"); 104 exit(1); 105 } 106 } 107 108 109 static void xen_change_state_handler(void *opaque, int running, 110 RunState state) 111 { 112 if (running) { 113 /* record state running */ 114 xenstore_record_dm_state(xenstore, "running"); 115 } 116 } 117 118 static int xen_init(MachineState *ms) 119 { 120 xen_xc = xc_interface_open(0, 0, 0); 121 if (xen_xc == NULL) { 122 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 123 return -1; 124 } 125 xen_fmem = xenforeignmemory_open(0, 0); 126 if (xen_fmem == NULL) { 127 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 128 xc_interface_close(xen_xc); 129 return -1; 130 } 131 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 132 133 global_state_set_optional(); 134 savevm_skip_configuration(); 135 savevm_skip_section_footers(); 136 137 return 0; 138 } 139 140 static void xen_accel_class_init(ObjectClass *oc, void *data) 141 { 142 AccelClass *ac = ACCEL_CLASS(oc); 143 ac->name = "Xen"; 144 ac->init_machine = xen_init; 145 ac->allowed = &xen_allowed; 146 } 147 148 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 149 150 static const TypeInfo xen_accel_type = { 151 .name = TYPE_XEN_ACCEL, 152 .parent = TYPE_ACCEL, 153 .class_init = xen_accel_class_init, 154 }; 155 156 static void xen_type_init(void) 157 { 158 type_register_static(&xen_accel_type); 159 } 160 161 type_init(xen_type_init); 162