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