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