accel/xen/xen-all.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/xen.h"
  20 #include "sysemu/runstate.h"
  21 #include "migration/misc.h"
  22 #include "migration/global_state.h"
  23 #include "hw/boards.h"
  24
  25 //#define DEBUG_XEN
  26
  27 #ifdef DEBUG_XEN
  28 #define DPRINTF(fmt, ...) \
  29     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  30 #else
  31 #define DPRINTF(fmt, ...) \
  32     do { } while (0)
  33 #endif
  34
  35 static bool xen_allowed;
  36
  37 bool xen_enabled(void)
  38 {
  39     return xen_allowed;
  40 }
  41
  42 xc_interface *xen_xc;
  43 xenforeignmemory_handle *xen_fmem;
  44 xendevicemodel_handle *xen_dmod;
  45
  46 static int store_dev_info(int domid, Chardev *cs, const char *string)
  47 {
  48     struct xs_handle *xs = NULL;
  49     char *path = NULL;
  50     char *newpath = NULL;
  51     char *pts = NULL;
  52     int ret = -1;
  53
  54     /* Only continue if we're talking to a pty. */
  55     if (!CHARDEV_IS_PTY(cs)) {
  56         return 0;
  57     }
  58     pts = cs->filename + 4;
  59
  60     /* We now have everything we need to set the xenstore entry. */
  61     xs = xs_open(0);
  62     if (xs == NULL) {
  63         fprintf(stderr, "Could not contact XenStore\n");
  64         goto out;
  65     }
  66
  67     path = xs_get_domain_path(xs, domid);
  68     if (path == NULL) {
  69         fprintf(stderr, "xs_get_domain_path() error\n");
  70         goto out;
  71     }
  72     newpath = realloc(path, (strlen(path) + strlen(string) +
  73                 strlen("/tty") + 1));
  74     if (newpath == NULL) {
  75         fprintf(stderr, "realloc error\n");
  76         goto out;
  77     }
  78     path = newpath;
  79
  80     strcat(path, string);
  81     strcat(path, "/tty");
  82     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  83         fprintf(stderr, "xs_write for '%s' fail", string);
  84         goto out;
  85     }
  86     ret = 0;
  87
  88 out:
  89     free(path);
  90     xs_close(xs);
  91
  92     return ret;
  93 }
  94
  95 void xenstore_store_pv_console_info(int i, Chardev *chr)
  96 {
  97     if (i == 0) {
  98         store_dev_info(xen_domid, chr, "/console");
  99     } else {
 100         char buf[32];
 101         snprintf(buf, sizeof(buf), "/device/console/%d", i);
 102         store_dev_info(xen_domid, chr, buf);
 103     }
 104 }
 105
 106
 107 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
 108 {
 109     char path[50];
 110
 111     if (xs == NULL) {
 112         error_report("xenstore connection not initialized");
 113         exit(1);
 114     }
 115
 116     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 117     /*
 118      * This call may fail when running restricted so don't make it fatal in
 119      * that case. Toolstacks should instead use QMP to listen for state changes.
 120      */
 121     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
 122             !xen_domid_restrict) {
 123         error_report("error recording dm state");
 124         exit(1);
 125     }
 126 }
 127
 128
 129 static void xen_change_state_handler(void *opaque, int running,
 130                                      RunState state)
 131 {
 132     if (running) {
 133         /* record state running */
 134         xenstore_record_dm_state(xenstore, "running");
 135     }
 136 }
 137
 138 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
 139 {
 140     return xen_igd_gfx_pt_enabled();
 141 }
 142
 143 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
 144 {
 145     xen_igd_gfx_pt_set(value, errp);
 146 }
 147
 148 static void xen_setup_post(MachineState *ms, AccelState *accel)
 149 {
 150     int rc;
 151
 152     if (xen_domid_restrict) {
 153         rc = xen_restrict(xen_domid);
 154         if (rc < 0) {
 155             perror("xen: failed to restrict");
 156             exit(1);
 157         }
 158     }
 159 }
 160
 161 static int xen_init(MachineState *ms)
 162 {
 163     MachineClass *mc = MACHINE_GET_CLASS(ms);
 164
 165     xen_xc = xc_interface_open(0, 0, 0);
 166     if (xen_xc == NULL) {
 167         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 168         return -1;
 169     }
 170     xen_fmem = xenforeignmemory_open(0, 0);
 171     if (xen_fmem == NULL) {
 172         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 173         xc_interface_close(xen_xc);
 174         return -1;
 175     }
 176     xen_dmod = xendevicemodel_open(0, 0);
 177     if (xen_dmod == NULL) {
 178         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 179         xenforeignmemory_close(xen_fmem);
 180         xc_interface_close(xen_xc);
 181         return -1;
 182     }
 183     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 184     /*
 185      * opt out of system RAM being allocated by generic code
 186      */
 187     mc->default_ram_id = NULL;
 188     return 0;
 189 }
 190
 191 static void xen_accel_class_init(ObjectClass *oc, void *data)
 192 {
 193     AccelClass *ac = ACCEL_CLASS(oc);
 194     static GlobalProperty compat[] = {
 195         { "migration", "store-global-state", "off" },
 196         { "migration", "send-configuration", "off" },
 197         { "migration", "send-section-footer", "off" },
 198     };
 199
 200     ac->name = "Xen";
 201     ac->init_machine = xen_init;
 202     ac->setup_post = xen_setup_post;
 203     ac->allowed = &xen_allowed;
 204     ac->compat_props = g_ptr_array_new();
 205
 206     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 207
 208     object_class_property_add_bool(oc, "igd-passthru",
 209         xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru);
 210     object_class_property_set_description(oc, "igd-passthru",
 211         "Set on/off to enable/disable igd passthrou");
 212 }
 213
 214 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 215
 216 static const TypeInfo xen_accel_type = {
 217     .name = TYPE_XEN_ACCEL,
 218     .parent = TYPE_ACCEL,
 219     .class_init = xen_accel_class_init,
 220 };
 221
 222 static void xen_type_init(void)
 223 {
 224     type_register_static(&xen_accel_type);
 225 }
 226
 227 type_init(xen_type_init);