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
  15 //#define DEBUG_XEN
  16
  17 #ifdef DEBUG_XEN
  18 #define DPRINTF(fmt, ...) \
  19     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  20 #else
  21 #define DPRINTF(fmt, ...) \
  22     do { } while (0)
  23 #endif
  24
  25 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
  26 {
  27     struct xs_handle *xs = NULL;
  28     char *path = NULL;
  29     char *newpath = NULL;
  30     char *pts = NULL;
  31     int ret = -1;
  32
  33     /* Only continue if we're talking to a pty. */
  34     if (strncmp(cs->filename, "pty:", 4)) {
  35         return 0;
  36     }
  37     pts = cs->filename + 4;
  38
  39     /* We now have everything we need to set the xenstore entry. */
  40     xs = xs_open(0);
  41     if (xs == NULL) {
  42         fprintf(stderr, "Could not contact XenStore\n");
  43         goto out;
  44     }
  45
  46     path = xs_get_domain_path(xs, domid);
  47     if (path == NULL) {
  48         fprintf(stderr, "xs_get_domain_path() error\n");
  49         goto out;
  50     }
  51     newpath = realloc(path, (strlen(path) + strlen(string) +
  52                 strlen("/tty") + 1));
  53     if (newpath == NULL) {
  54         fprintf(stderr, "realloc error\n");
  55         goto out;
  56     }
  57     path = newpath;
  58
  59     strcat(path, string);
  60     strcat(path, "/tty");
  61     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  62         fprintf(stderr, "xs_write for '%s' fail", string);
  63         goto out;
  64     }
  65     ret = 0;
  66
  67 out:
  68     free(path);
  69     xs_close(xs);
  70
  71     return ret;
  72 }
  73
  74 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
  75 {
  76     if (i == 0) {
  77         store_dev_info(xen_domid, chr, "/console");
  78     } else {
  79         char buf[32];
  80         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  81         store_dev_info(xen_domid, chr, buf);
  82     }
  83 }
  84
  85
  86 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
  87 {
  88     char path[50];
  89
  90     if (xs == NULL) {
  91         fprintf(stderr, "xenstore connection not initialized\n");
  92         exit(1);
  93     }
  94
  95     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
  96     if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
  97         fprintf(stderr, "error recording dm state\n");
  98         exit(1);
  99     }
 100 }
 101
 102
 103 static void xen_change_state_handler(void *opaque, int running,
 104                                      RunState state)
 105 {
 106     if (running) {
 107         /* record state running */
 108         xenstore_record_dm_state(xenstore, "running");
 109     }
 110 }
 111
 112 int xen_init(MachineClass *mc)
 113 {
 114     xen_xc = xen_xc_interface_open(0, 0, 0);
 115     if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
 116         xen_be_printf(NULL, 0, "can't open xen interface\n");
 117         return -1;
 118     }
 119     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 120
 121     return 0;
 122 }
 123