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 "hw/xen/xen_backend.h"
  12 #include "qmp-commands.h"
  13 #include "sysemu/char.h"
  14 #include "sysemu/accel.h"
  15
  16 //#define DEBUG_XEN
  17
  18 #ifdef DEBUG_XEN
  19 #define DPRINTF(fmt, ...) \
  20     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  21 #else
  22 #define DPRINTF(fmt, ...) \
  23     do { } while (0)
  24 #endif
  25
  26 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
  27 {
  28     struct xs_handle *xs = NULL;
  29     char *path = NULL;
  30     char *newpath = NULL;
  31     char *pts = NULL;
  32     int ret = -1;
  33
  34     /* Only continue if we're talking to a pty. */
  35     if (strncmp(cs->filename, "pty:", 4)) {
  36         return 0;
  37     }
  38     pts = cs->filename + 4;
  39
  40     /* We now have everything we need to set the xenstore entry. */
  41     xs = xs_open(0);
  42     if (xs == NULL) {
  43         fprintf(stderr, "Could not contact XenStore\n");
  44         goto out;
  45     }
  46
  47     path = xs_get_domain_path(xs, domid);
  48     if (path == NULL) {
  49         fprintf(stderr, "xs_get_domain_path() error\n");
  50         goto out;
  51     }
  52     newpath = realloc(path, (strlen(path) + strlen(string) +
  53                 strlen("/tty") + 1));
  54     if (newpath == NULL) {
  55         fprintf(stderr, "realloc error\n");
  56         goto out;
  57     }
  58     path = newpath;
  59
  60     strcat(path, string);
  61     strcat(path, "/tty");
  62     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  63         fprintf(stderr, "xs_write for '%s' fail", string);
  64         goto out;
  65     }
  66     ret = 0;
  67
  68 out:
  69     free(path);
  70     xs_close(xs);
  71
  72     return ret;
  73 }
  74
  75 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
  76 {
  77     if (i == 0) {
  78         store_dev_info(xen_domid, chr, "/console");
  79     } else {
  80         char buf[32];
  81         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  82         store_dev_info(xen_domid, chr, buf);
  83     }
  84 }
  85
  86
  87 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
  88 {
  89     char path[50];
  90
  91     if (xs == NULL) {
  92         fprintf(stderr, "xenstore connection not initialized\n");
  93         exit(1);
  94     }
  95
  96     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
  97     if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
  98         fprintf(stderr, "error recording dm state\n");
  99         exit(1);
 100     }
 101 }
 102
 103
 104 static void xen_change_state_handler(void *opaque, int running,
 105                                      RunState state)
 106 {
 107     if (running) {
 108         /* record state running */
 109         xenstore_record_dm_state(xenstore, "running");
 110     }
 111 }
 112
 113 static int xen_init(MachineState *ms)
 114 {
 115     xen_xc = xen_xc_interface_open(0, 0, 0);
 116     if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
 117         xen_be_printf(NULL, 0, "can't open xen interface\n");
 118         return -1;
 119     }
 120     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 121
 122     return 0;
 123 }
 124
 125 static void xen_accel_class_init(ObjectClass *oc, void *data)
 126 {
 127     AccelClass *ac = ACCEL_CLASS(oc);
 128     ac->name = "Xen";
 129     ac->init_machine = xen_init;
 130     ac->allowed = &xen_allowed;
 131 }
 132
 133 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 134
 135 static const TypeInfo xen_accel_type = {
 136     .name = TYPE_XEN_ACCEL,
 137     .parent = TYPE_ACCEL,
 138     .class_init = xen_accel_class_init,
 139 };
 140
 141 static void xen_type_init(void)
 142 {
 143     type_register_static(&xen_accel_type);
 144 }
 145
 146 type_init(xen_type_init);