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 xendevicemodel_handle *xen_dmod; 31 32 static int store_dev_info(int domid, Chardev *cs, const char *string) 33 { 34 struct xs_handle *xs = NULL; 35 char *path = NULL; 36 char *newpath = NULL; 37 char *pts = NULL; 38 int ret = -1; 39 40 /* Only continue if we're talking to a pty. */ 41 if (strncmp(cs->filename, "pty:", 4)) { 42 return 0; 43 } 44 pts = cs->filename + 4; 45 46 /* We now have everything we need to set the xenstore entry. */ 47 xs = xs_open(0); 48 if (xs == NULL) { 49 fprintf(stderr, "Could not contact XenStore\n"); 50 goto out; 51 } 52 53 path = xs_get_domain_path(xs, domid); 54 if (path == NULL) { 55 fprintf(stderr, "xs_get_domain_path() error\n"); 56 goto out; 57 } 58 newpath = realloc(path, (strlen(path) + strlen(string) + 59 strlen("/tty") + 1)); 60 if (newpath == NULL) { 61 fprintf(stderr, "realloc error\n"); 62 goto out; 63 } 64 path = newpath; 65 66 strcat(path, string); 67 strcat(path, "/tty"); 68 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 69 fprintf(stderr, "xs_write for '%s' fail", string); 70 goto out; 71 } 72 ret = 0; 73 74 out: 75 free(path); 76 xs_close(xs); 77 78 return ret; 79 } 80 81 void xenstore_store_pv_console_info(int i, Chardev *chr) 82 { 83 if (i == 0) { 84 store_dev_info(xen_domid, chr, "/console"); 85 } else { 86 char buf[32]; 87 snprintf(buf, sizeof(buf), "/device/console/%d", i); 88 store_dev_info(xen_domid, chr, buf); 89 } 90 } 91 92 93 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 94 { 95 char path[50]; 96 97 if (xs == NULL) { 98 fprintf(stderr, "xenstore connection not initialized\n"); 99 exit(1); 100 } 101 102 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 103 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { 104 fprintf(stderr, "error recording dm state\n"); 105 exit(1); 106 } 107 } 108 109 110 static void xen_change_state_handler(void *opaque, int running, 111 RunState state) 112 { 113 if (running) { 114 /* record state running */ 115 xenstore_record_dm_state(xenstore, "running"); 116 } 117 } 118 119 static int xen_init(MachineState *ms) 120 { 121 xen_xc = xc_interface_open(0, 0, 0); 122 if (xen_xc == NULL) { 123 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 124 return -1; 125 } 126 xen_fmem = xenforeignmemory_open(0, 0); 127 if (xen_fmem == NULL) { 128 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 129 xc_interface_close(xen_xc); 130 return -1; 131 } 132 xen_dmod = xendevicemodel_open(0, 0); 133 if (xen_dmod == NULL) { 134 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 135 xenforeignmemory_close(xen_fmem); 136 xc_interface_close(xen_xc); 137 return -1; 138 } 139 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 140 141 global_state_set_optional(); 142 savevm_skip_configuration(); 143 savevm_skip_section_footers(); 144 145 return 0; 146 } 147 148 static void xen_accel_class_init(ObjectClass *oc, void *data) 149 { 150 AccelClass *ac = ACCEL_CLASS(oc); 151 ac->name = "Xen"; 152 ac->init_machine = xen_init; 153 ac->allowed = &xen_allowed; 154 } 155 156 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 157 158 static const TypeInfo xen_accel_type = { 159 .name = TYPE_XEN_ACCEL, 160 .parent = TYPE_ACCEL, 161 .class_init = xen_accel_class_init, 162 }; 163 164 static void xen_type_init(void) 165 { 166 type_register_static(&xen_accel_type); 167 } 168 169 type_init(xen_type_init); 170