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 "qemu/module.h"
  14 #include "hw/xen/xen-legacy-backend.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     /*
 106      * This call may fail when running restricted so don't make it fatal in
 107      * that case. Toolstacks should instead use QMP to listen for state changes.
 108      */
 109     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
 110             !xen_domid_restrict) {
 111         error_report("error recording dm state");
 112         exit(1);
 113     }
 114 }
 115
 116
 117 static void xen_change_state_handler(void *opaque, int running,
 118                                      RunState state)
 119 {
 120     if (running) {
 121         /* record state running */
 122         xenstore_record_dm_state(xenstore, "running");
 123     }
 124 }
 125
 126 static void xen_setup_post(MachineState *ms, AccelState *accel)
 127 {
 128     int rc;
 129
 130     if (xen_domid_restrict) {
 131         rc = xen_restrict(xen_domid);
 132         if (rc < 0) {
 133             perror("xen: failed to restrict");
 134             exit(1);
 135         }
 136     }
 137 }
 138
 139 static int xen_init(MachineState *ms)
 140 {
 141     xen_xc = xc_interface_open(0, 0, 0);
 142     if (xen_xc == NULL) {
 143         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 144         return -1;
 145     }
 146     xen_fmem = xenforeignmemory_open(0, 0);
 147     if (xen_fmem == NULL) {
 148         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 149         xc_interface_close(xen_xc);
 150         return -1;
 151     }
 152     xen_dmod = xendevicemodel_open(0, 0);
 153     if (xen_dmod == NULL) {
 154         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 155         xenforeignmemory_close(xen_fmem);
 156         xc_interface_close(xen_xc);
 157         return -1;
 158     }
 159     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 160     return 0;
 161 }
 162
 163 static void xen_accel_class_init(ObjectClass *oc, void *data)
 164 {
 165     AccelClass *ac = ACCEL_CLASS(oc);
 166     static GlobalProperty compat[] = {
 167         { "migration", "store-global-state", "off" },
 168         { "migration", "send-configuration", "off" },
 169         { "migration", "send-section-footer", "off" },
 170     };
 171
 172     ac->name = "Xen";
 173     ac->init_machine = xen_init;
 174     ac->setup_post = xen_setup_post;
 175     ac->allowed = &xen_allowed;
 176     ac->compat_props = g_ptr_array_new();
 177
 178     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 179 }
 180
 181 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 182
 183 static const TypeInfo xen_accel_type = {
 184     .name = TYPE_XEN_ACCEL,
 185     .parent = TYPE_ACCEL,
 186     .class_init = xen_accel_class_init,
 187 };
 188
 189 static void xen_type_init(void)
 190 {
 191     type_register_static(&xen_accel_type);
 192 }
 193
 194 type_init(xen_type_init);