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