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 "qapi/error.h"
  15 #include "hw/xen/xen-legacy-backend.h"
  16 #include "hw/xen/xen_pt.h"
  17 #include "chardev/char.h"
  18 #include "sysemu/accel.h"
  19 #include "sysemu/runstate.h"
  20 #include "migration/misc.h"
  21 #include "migration/global_state.h"
  22 #include "hw/boards.h"
  23
  24 //#define DEBUG_XEN
  25
  26 #ifdef DEBUG_XEN
  27 #define DPRINTF(fmt, ...) \
  28     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  29 #else
  30 #define DPRINTF(fmt, ...) \
  31     do { } while (0)
  32 #endif
  33
  34 xc_interface *xen_xc;
  35 xenforeignmemory_handle *xen_fmem;
  36 xendevicemodel_handle *xen_dmod;
  37
  38 static int store_dev_info(int domid, Chardev *cs, const char *string)
  39 {
  40     struct xs_handle *xs = NULL;
  41     char *path = NULL;
  42     char *newpath = NULL;
  43     char *pts = NULL;
  44     int ret = -1;
  45
  46     /* Only continue if we're talking to a pty. */
  47     if (!CHARDEV_IS_PTY(cs)) {
  48         return 0;
  49     }
  50     pts = cs->filename + 4;
  51
  52     /* We now have everything we need to set the xenstore entry. */
  53     xs = xs_open(0);
  54     if (xs == NULL) {
  55         fprintf(stderr, "Could not contact XenStore\n");
  56         goto out;
  57     }
  58
  59     path = xs_get_domain_path(xs, domid);
  60     if (path == NULL) {
  61         fprintf(stderr, "xs_get_domain_path() error\n");
  62         goto out;
  63     }
  64     newpath = realloc(path, (strlen(path) + strlen(string) +
  65                 strlen("/tty") + 1));
  66     if (newpath == NULL) {
  67         fprintf(stderr, "realloc error\n");
  68         goto out;
  69     }
  70     path = newpath;
  71
  72     strcat(path, string);
  73     strcat(path, "/tty");
  74     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  75         fprintf(stderr, "xs_write for '%s' fail", string);
  76         goto out;
  77     }
  78     ret = 0;
  79
  80 out:
  81     free(path);
  82     xs_close(xs);
  83
  84     return ret;
  85 }
  86
  87 void xenstore_store_pv_console_info(int i, Chardev *chr)
  88 {
  89     if (i == 0) {
  90         store_dev_info(xen_domid, chr, "/console");
  91     } else {
  92         char buf[32];
  93         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  94         store_dev_info(xen_domid, chr, buf);
  95     }
  96 }
  97
  98
  99 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
 100 {
 101     char path[50];
 102
 103     if (xs == NULL) {
 104         error_report("xenstore connection not initialized");
 105         exit(1);
 106     }
 107
 108     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 109     /*
 110      * This call may fail when running restricted so don't make it fatal in
 111      * that case. Toolstacks should instead use QMP to listen for state changes.
 112      */
 113     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
 114             !xen_domid_restrict) {
 115         error_report("error recording dm state");
 116         exit(1);
 117     }
 118 }
 119
 120
 121 static void xen_change_state_handler(void *opaque, int running,
 122                                      RunState state)
 123 {
 124     if (running) {
 125         /* record state running */
 126         xenstore_record_dm_state(xenstore, "running");
 127     }
 128 }
 129
 130 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
 131 {
 132     return has_igd_gfx_passthru;
 133 }
 134
 135 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
 136 {
 137     has_igd_gfx_passthru = value;
 138 }
 139
 140 static void xen_setup_post(MachineState *ms, AccelState *accel)
 141 {
 142     int rc;
 143
 144     if (xen_domid_restrict) {
 145         rc = xen_restrict(xen_domid);
 146         if (rc < 0) {
 147             perror("xen: failed to restrict");
 148             exit(1);
 149         }
 150     }
 151 }
 152
 153 static int xen_init(MachineState *ms)
 154 {
 155     MachineClass *mc = MACHINE_GET_CLASS(ms);
 156
 157     xen_xc = xc_interface_open(0, 0, 0);
 158     if (xen_xc == NULL) {
 159         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 160         return -1;
 161     }
 162     xen_fmem = xenforeignmemory_open(0, 0);
 163     if (xen_fmem == NULL) {
 164         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 165         xc_interface_close(xen_xc);
 166         return -1;
 167     }
 168     xen_dmod = xendevicemodel_open(0, 0);
 169     if (xen_dmod == NULL) {
 170         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 171         xenforeignmemory_close(xen_fmem);
 172         xc_interface_close(xen_xc);
 173         return -1;
 174     }
 175     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 176     /*
 177      * opt out of system RAM being allocated by generic code
 178      */
 179     mc->default_ram_id = NULL;
 180     return 0;
 181 }
 182
 183 static void xen_accel_class_init(ObjectClass *oc, void *data)
 184 {
 185     AccelClass *ac = ACCEL_CLASS(oc);
 186     static GlobalProperty compat[] = {
 187         { "migration", "store-global-state", "off" },
 188         { "migration", "send-configuration", "off" },
 189         { "migration", "send-section-footer", "off" },
 190     };
 191
 192     ac->name = "Xen";
 193     ac->init_machine = xen_init;
 194     ac->setup_post = xen_setup_post;
 195     ac->allowed = &xen_allowed;
 196     ac->compat_props = g_ptr_array_new();
 197
 198     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 199
 200     object_class_property_add_bool(oc, "igd-passthru",
 201         xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru);
 202     object_class_property_set_description(oc, "igd-passthru",
 203         "Set on/off to enable/disable igd passthrou");
 204 }
 205
 206 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 207
 208 static const TypeInfo xen_accel_type = {
 209     .name = TYPE_XEN_ACCEL,
 210     .parent = TYPE_ACCEL,
 211     .class_init = xen_accel_class_init,
 212 };
 213
 214 static void xen_type_init(void)
 215 {
 216     type_register_static(&xen_accel_type);
 217 }
 218
 219 type_init(xen_type_init);