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