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/i386/pc.h" 13 #include "hw/xen/xen_backend.h" 14 #include "qmp-commands.h" 15 #include "sysemu/char.h" 16 #include "sysemu/accel.h" 17 #include "migration/migration.h" 18 19 //#define DEBUG_XEN 20 21 #ifdef DEBUG_XEN 22 #define DPRINTF(fmt, ...) \ 23 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0) 24 #else 25 #define DPRINTF(fmt, ...) \ 26 do { } while (0) 27 #endif 28 29 static int store_dev_info(int domid, CharDriverState *cs, const char *string) 30 { 31 struct xs_handle *xs = NULL; 32 char *path = NULL; 33 char *newpath = NULL; 34 char *pts = NULL; 35 int ret = -1; 36 37 /* Only continue if we're talking to a pty. */ 38 if (strncmp(cs->filename, "pty:", 4)) { 39 return 0; 40 } 41 pts = cs->filename + 4; 42 43 /* We now have everything we need to set the xenstore entry. */ 44 xs = xs_open(0); 45 if (xs == NULL) { 46 fprintf(stderr, "Could not contact XenStore\n"); 47 goto out; 48 } 49 50 path = xs_get_domain_path(xs, domid); 51 if (path == NULL) { 52 fprintf(stderr, "xs_get_domain_path() error\n"); 53 goto out; 54 } 55 newpath = realloc(path, (strlen(path) + strlen(string) + 56 strlen("/tty") + 1)); 57 if (newpath == NULL) { 58 fprintf(stderr, "realloc error\n"); 59 goto out; 60 } 61 path = newpath; 62 63 strcat(path, string); 64 strcat(path, "/tty"); 65 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) { 66 fprintf(stderr, "xs_write for '%s' fail", string); 67 goto out; 68 } 69 ret = 0; 70 71 out: 72 free(path); 73 xs_close(xs); 74 75 return ret; 76 } 77 78 void xenstore_store_pv_console_info(int i, CharDriverState *chr) 79 { 80 if (i == 0) { 81 store_dev_info(xen_domid, chr, "/console"); 82 } else { 83 char buf[32]; 84 snprintf(buf, sizeof(buf), "/device/console/%d", i); 85 store_dev_info(xen_domid, chr, buf); 86 } 87 } 88 89 90 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state) 91 { 92 char path[50]; 93 94 if (xs == NULL) { 95 fprintf(stderr, "xenstore connection not initialized\n"); 96 exit(1); 97 } 98 99 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); 100 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) { 101 fprintf(stderr, "error recording dm state\n"); 102 exit(1); 103 } 104 } 105 106 107 static void xen_change_state_handler(void *opaque, int running, 108 RunState state) 109 { 110 if (running) { 111 /* record state running */ 112 xenstore_record_dm_state(xenstore, "running"); 113 } 114 } 115 116 static int xen_init(MachineState *ms) 117 { 118 PCMachineState *pcms = PC_MACHINE(ms); 119 120 /* Disable ACPI build because Xen handles it */ 121 pcms->acpi_build_enabled = false; 122 123 xen_xc = xc_interface_open(0, 0, 0); 124 if (xen_xc == NULL) { 125 xen_pv_printf(NULL, 0, "can't open xen interface\n"); 126 return -1; 127 } 128 xen_fmem = xenforeignmemory_open(0, 0); 129 if (xen_fmem == NULL) { 130 xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); 131 xc_interface_close(xen_xc); 132 return -1; 133 } 134 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL); 135 136 global_state_set_optional(); 137 savevm_skip_configuration(); 138 savevm_skip_section_footers(); 139 140 return 0; 141 } 142 143 static void xen_accel_class_init(ObjectClass *oc, void *data) 144 { 145 AccelClass *ac = ACCEL_CLASS(oc); 146 ac->name = "Xen"; 147 ac->init_machine = xen_init; 148 ac->allowed = &xen_allowed; 149 } 150 151 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen") 152 153 static const TypeInfo xen_accel_type = { 154 .name = TYPE_XEN_ACCEL, 155 .parent = TYPE_ACCEL, 156 .class_init = xen_accel_class_init, 157 }; 158 159 static void xen_type_init(void) 160 { 161 type_register_static(&xen_accel_type); 162 } 163 164 type_init(xen_type_init); 165