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