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 "qemu/error-report.h" 13 #include "qemu/module.h" 14 #include "hw/xen/xen-legacy-backend.h" 15 #include "chardev/char.h" 16 #include "sysemu/accel.h" 17 #include "sysemu/runstate.h" 18 #include "migration/misc.h" 19 #include "migration/global_state.h" 20 21 //#define DEBUG_XEN 22 23 #ifdef DEBUG_XEN 24 #define DPRINTF(fmt, ...) \ 25 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) 26 #else 27 #define DPRINTF(fmt, ...) \ 28 do { } while (0) 29 #endif 30 31 xc_interface *xen_xc; 32 xenforeignmemory_handle *xen_fmem; 33 xendevicemodel_handle *xen_dmod; 34 35 static int store_dev_info(int domid, Chardev *cs, const char *string) 36 { 37 struct xs_handle *xs = NULL; 38 char *path = NULL; 39 char *newpath = NULL; 40 char *pts = NULL; 41 int ret = -1; 42 43 /* Only continue if we're talking to a pty. */ 44 if (!CHARDEV_IS_PTY(cs)) { 45 return 0; 46 } 47 pts = cs->filename + 4; 48 49 /* We now have everything we need to set the xenstore entry. */ 50 xs = xs_open(0); 51 if (xs == NULL) { 52 fprintf(stderr, "Could not contact XenStore\n"); 53 goto out; 54 } 55 56 path = xs_get_domain_path(xs, domid); 57 if (path == NULL) { 58 fprintf(stderr, "xs_get_domain_path() error\n"); 59 goto out; 60 } 61 newpath = realloc(path, (strlen(path) + strlen(string) + 62 strlen("/tty") + 1)); 63 if (newpath == NULL) { 64 fprintf(stderr, "realloc error\n"); 65 goto out; 66 } 67 path = newpath; 68 69 strcat(path, string); 70 strcat(path, "/tty"); 71 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 72 fprintf(stderr, "xs_write for '%s' fail", string); 73 goto out; 74 } 75 ret = 0; 76 77 out: 78 free(path); 79 xs_close(xs); 80 81 return ret; 82 } 83 84 void xenstore_store_pv_console_info(int i, Chardev *chr) 85 { 86 if (i == 0) { 87 store_dev_info(xen_domid, chr, "/console"); 88 } else { 89 char buf[32]; 90 snprintf(buf, sizeof(buf), "/device/console/%d", i); 91 store_dev_info(xen_domid, chr, buf); 92 } 93 } 94 95 96 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 97 { 98 char path[50]; 99 100 if (xs == NULL) { 101 error_report("xenstore connection not initialized"); 102 exit(1); 103 } 104 105 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 106 /* 107 * This call may fail when running restricted so don't make it fatal in 108 * that case. Toolstacks should instead use QMP to listen for state changes. 109 */ 110 if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) && 111 !xen_domid_restrict) { 112 error_report("error recording dm state"); 113 exit(1); 114 } 115 } 116 117 118 static void xen_change_state_handler(void *opaque, int running, 119 RunState state) 120 { 121 if (running) { 122 /* record state running */ 123 xenstore_record_dm_state(xenstore, "running"); 124 } 125 } 126 127 static void xen_setup_post(MachineState *ms, AccelState *accel) 128 { 129 int rc; 130 131 if (xen_domid_restrict) { 132 rc = xen_restrict(xen_domid); 133 if (rc < 0) { 134 perror("xen: failed to restrict"); 135 exit(1); 136 } 137 } 138 } 139 140 static int xen_init(MachineState *ms) 141 { 142 xen_xc = xc_interface_open(0, 0, 0); 143 if (xen_xc == NULL) { 144 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 145 return -1; 146 } 147 xen_fmem = xenforeignmemory_open(0, 0); 148 if (xen_fmem == NULL) { 149 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 150 xc_interface_close(xen_xc); 151 return -1; 152 } 153 xen_dmod = xendevicemodel_open(0, 0); 154 if (xen_dmod == NULL) { 155 xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); 156 xenforeignmemory_close(xen_fmem); 157 xc_interface_close(xen_xc); 158 return -1; 159 } 160 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 161 return 0; 162 } 163 164 static void xen_accel_class_init(ObjectClass *oc, void *data) 165 { 166 AccelClass *ac = ACCEL_CLASS(oc); 167 static GlobalProperty compat[] = { 168 { "migration", "store-global-state", "off" }, 169 { "migration", "send-configuration", "off" }, 170 { "migration", "send-section-footer", "off" }, 171 }; 172 173 ac->name = "Xen"; 174 ac->init_machine = xen_init; 175 ac->setup_post = xen_setup_post; 176 ac->allowed = &xen_allowed; 177 ac->compat_props = g_ptr_array_new(); 178 179 compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat)); 180 } 181 182 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 183 184 static const TypeInfo xen_accel_type = { 185 .name = TYPE_XEN_ACCEL, 186 .parent = TYPE_ACCEL, 187 .class_init = xen_accel_class_init, 188 }; 189 190 static void xen_type_init(void) 191 { 192 type_register_static(&xen_accel_type); 193 } 194 195 type_init(xen_type_init); 196