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-legacy-backend.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         error_report("xenstore connection not initialized");
 100         exit(1);
 101     }
 102
 103     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 104     /*
 105      * This call may fail when running restricted so don't make it fatal in
 106      * that case. Toolstacks should instead use QMP to listen for state changes.
 107      */
 108     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
 109             !xen_domid_restrict) {
 110         error_report("error recording dm state");
 111         exit(1);
 112     }
 113 }
 114
 115
 116 static void xen_change_state_handler(void *opaque, int running,
 117                                      RunState state)
 118 {
 119     if (running) {
 120         /* record state running */
 121         xenstore_record_dm_state(xenstore, "running");
 122     }
 123 }
 124
 125 static void xen_setup_post(MachineState *ms, AccelState *accel)
 126 {
 127     int rc;
 128
 129     if (xen_domid_restrict) {
 130         rc = xen_restrict(xen_domid);
 131         if (rc < 0) {
 132             perror("xen: failed to restrict");
 133             exit(1);
 134         }
 135     }
 136 }
 137
 138 static int xen_init(MachineState *ms)
 139 {
 140     xen_xc = xc_interface_open(0, 0, 0);
 141     if (xen_xc == NULL) {
 142         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 143         return -1;
 144     }
 145     xen_fmem = xenforeignmemory_open(0, 0);
 146     if (xen_fmem == NULL) {
 147         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 148         xc_interface_close(xen_xc);
 149         return -1;
 150     }
 151     xen_dmod = xendevicemodel_open(0, 0);
 152     if (xen_dmod == NULL) {
 153         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 154         xenforeignmemory_close(xen_fmem);
 155         xc_interface_close(xen_xc);
 156         return -1;
 157     }
 158     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 159     return 0;
 160 }
 161
 162 static void xen_accel_class_init(ObjectClass *oc, void *data)
 163 {
 164     AccelClass *ac = ACCEL_CLASS(oc);
 165     static GlobalProperty compat[] = {
 166         { "migration", "store-global-state", "off" },
 167         { "migration", "send-configuration", "off" },
 168         { "migration", "send-section-footer", "off" },
 169     };
 170
 171     ac->name = "Xen";
 172     ac->init_machine = xen_init;
 173     ac->setup_post = xen_setup_post;
 174     ac->allowed = &xen_allowed;
 175     ac->compat_props = g_ptr_array_new();
 176
 177     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 178 }
 179
 180 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 181
 182 static const TypeInfo xen_accel_type = {
 183     .name = TYPE_XEN_ACCEL,
 184     .parent = TYPE_ACCEL,
 185     .class_init = xen_accel_class_init,
 186 };
 187
 188 static void xen_type_init(void)
 189 {
 190     type_register_static(&xen_accel_type);
 191 }
 192
 193 type_init(xen_type_init);