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 "qemu/accel.h"
  19 #include "sysemu/cpus.h"
  20 #include "sysemu/xen.h"
  21 #include "sysemu/runstate.h"
  22 #include "migration/misc.h"
  23 #include "migration/global_state.h"
  24 #include "hw/boards.h"
  25
  26 //#define DEBUG_XEN
  27
  28 #ifdef DEBUG_XEN
  29 #define DPRINTF(fmt, ...) \
  30     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  31 #else
  32 #define DPRINTF(fmt, ...) \
  33     do { } while (0)
  34 #endif
  35
  36 bool xen_allowed;
  37
  38 xc_interface *xen_xc;
  39 xenforeignmemory_handle *xen_fmem;
  40 xendevicemodel_handle *xen_dmod;
  41
  42 static int store_dev_info(int domid, Chardev *cs, const char *string)
  43 {
  44     struct xs_handle *xs = NULL;
  45     char *path = NULL;
  46     char *newpath = NULL;
  47     char *pts = NULL;
  48     int ret = -1;
  49
  50     /* Only continue if we're talking to a pty. */
  51     if (!CHARDEV_IS_PTY(cs)) {
  52         return 0;
  53     }
  54     pts = cs->filename + 4;
  55
  56     /* We now have everything we need to set the xenstore entry. */
  57     xs = xs_open(0);
  58     if (xs == NULL) {
  59         fprintf(stderr, "Could not contact XenStore\n");
  60         goto out;
  61     }
  62
  63     path = xs_get_domain_path(xs, domid);
  64     if (path == NULL) {
  65         fprintf(stderr, "xs_get_domain_path() error\n");
  66         goto out;
  67     }
  68     newpath = realloc(path, (strlen(path) + strlen(string) +
  69                 strlen("/tty") + 1));
  70     if (newpath == NULL) {
  71         fprintf(stderr, "realloc error\n");
  72         goto out;
  73     }
  74     path = newpath;
  75
  76     strcat(path, string);
  77     strcat(path, "/tty");
  78     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  79         fprintf(stderr, "xs_write for '%s' fail", string);
  80         goto out;
  81     }
  82     ret = 0;
  83
  84 out:
  85     free(path);
  86     xs_close(xs);
  87
  88     return ret;
  89 }
  90
  91 void xenstore_store_pv_console_info(int i, Chardev *chr)
  92 {
  93     if (i == 0) {
  94         store_dev_info(xen_domid, chr, "/console");
  95     } else {
  96         char buf[32];
  97         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  98         store_dev_info(xen_domid, chr, buf);
  99     }
 100 }
 101
 102
 103 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
 104 {
 105     char path[50];
 106
 107     if (xs == NULL) {
 108         error_report("xenstore connection not initialized");
 109         exit(1);
 110     }
 111
 112     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 113     /*
 114      * This call may fail when running restricted so don't make it fatal in
 115      * that case. Toolstacks should instead use QMP to listen for state changes.
 116      */
 117     if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
 118             !xen_domid_restrict) {
 119         error_report("error recording dm state");
 120         exit(1);
 121     }
 122 }
 123
 124
 125 static void xen_change_state_handler(void *opaque, bool running,
 126                                      RunState state)
 127 {
 128     if (running) {
 129         /* record state running */
 130         xenstore_record_dm_state(xenstore, "running");
 131     }
 132 }
 133
 134 static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
 135 {
 136     return xen_igd_gfx_pt_enabled();
 137 }
 138
 139 static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
 140 {
 141     xen_igd_gfx_pt_set(value, errp);
 142 }
 143
 144 static void xen_setup_post(MachineState *ms, AccelState *accel)
 145 {
 146     int rc;
 147
 148     if (xen_domid_restrict) {
 149         rc = xen_restrict(xen_domid);
 150         if (rc < 0) {
 151             perror("xen: failed to restrict");
 152             exit(1);
 153         }
 154     }
 155 }
 156
 157 static int xen_init(MachineState *ms)
 158 {
 159     MachineClass *mc = MACHINE_GET_CLASS(ms);
 160
 161     xen_xc = xc_interface_open(0, 0, 0);
 162     if (xen_xc == NULL) {
 163         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 164         return -1;
 165     }
 166     xen_fmem = xenforeignmemory_open(0, 0);
 167     if (xen_fmem == NULL) {
 168         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 169         xc_interface_close(xen_xc);
 170         return -1;
 171     }
 172     xen_dmod = xendevicemodel_open(0, 0);
 173     if (xen_dmod == NULL) {
 174         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 175         xenforeignmemory_close(xen_fmem);
 176         xc_interface_close(xen_xc);
 177         return -1;
 178     }
 179     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 180     /*
 181      * opt out of system RAM being allocated by generic code
 182      */
 183     mc->default_ram_id = NULL;
 184     return 0;
 185 }
 186
 187 static void xen_accel_class_init(ObjectClass *oc, void *data)
 188 {
 189     AccelClass *ac = ACCEL_CLASS(oc);
 190     static GlobalProperty compat[] = {
 191         { "migration", "store-global-state", "off" },
 192         { "migration", "send-configuration", "off" },
 193         { "migration", "send-section-footer", "off" },
 194     };
 195
 196     ac->name = "Xen";
 197     ac->init_machine = xen_init;
 198     ac->setup_post = xen_setup_post;
 199     ac->allowed = &xen_allowed;
 200     ac->compat_props = g_ptr_array_new();
 201
 202     compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
 203
 204     object_class_property_add_bool(oc, "igd-passthru",
 205         xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru);
 206     object_class_property_set_description(oc, "igd-passthru",
 207         "Set on/off to enable/disable igd passthrou");
 208 }
 209
 210 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 211
 212 static const TypeInfo xen_accel_type = {
 213     .name = TYPE_XEN_ACCEL,
 214     .parent = TYPE_ACCEL,
 215     .class_init = xen_accel_class_init,
 216 };
 217
 218 static void xen_accel_ops_class_init(ObjectClass *oc, void *data)
 219 {
 220     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
 221
 222     ops->create_vcpu_thread = dummy_start_vcpu_thread;
 223 }
 224
 225 static const TypeInfo xen_accel_ops_type = {
 226     .name = ACCEL_OPS_NAME("xen"),
 227
 228     .parent = TYPE_ACCEL_OPS,
 229     .class_init = xen_accel_ops_class_init,
 230     .abstract = true,
 231 };
 232
 233 static void xen_type_init(void)
 234 {
 235     type_register_static(&xen_accel_type);
 236     type_register_static(&xen_accel_ops_type);
 237 }
 238 type_init(xen_type_init);