xen-common.c

   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, CharDriverState *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, CharDriverState *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_be_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_be_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);