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 "hw/xen/xen_backend.h"
  13 #include "qmp-commands.h"
  14 #include "sysemu/char.h"
  15 #include "sysemu/accel.h"
  16 #include "migration/migration.h"
  17
  18 //#define DEBUG_XEN
  19
  20 #ifdef DEBUG_XEN
  21 #define DPRINTF(fmt, ...) \
  22     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  23 #else
  24 #define DPRINTF(fmt, ...) \
  25     do { } while (0)
  26 #endif
  27
  28 xc_interface *xen_xc;
  29 xenforeignmemory_handle *xen_fmem;
  30 xendevicemodel_handle *xen_dmod;
  31
  32 static int store_dev_info(int domid, Chardev *cs, const char *string)
  33 {
  34     struct xs_handle *xs = NULL;
  35     char *path = NULL;
  36     char *newpath = NULL;
  37     char *pts = NULL;
  38     int ret = -1;
  39
  40     /* Only continue if we're talking to a pty. */
  41     if (!CHARDEV_IS_PTY(cs)) {
  42         return 0;
  43     }
  44     pts = cs->filename + 4;
  45
  46     /* We now have everything we need to set the xenstore entry. */
  47     xs = xs_open(0);
  48     if (xs == NULL) {
  49         fprintf(stderr, "Could not contact XenStore\n");
  50         goto out;
  51     }
  52
  53     path = xs_get_domain_path(xs, domid);
  54     if (path == NULL) {
  55         fprintf(stderr, "xs_get_domain_path() error\n");
  56         goto out;
  57     }
  58     newpath = realloc(path, (strlen(path) + strlen(string) +
  59                 strlen("/tty") + 1));
  60     if (newpath == NULL) {
  61         fprintf(stderr, "realloc error\n");
  62         goto out;
  63     }
  64     path = newpath;
  65
  66     strcat(path, string);
  67     strcat(path, "/tty");
  68     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  69         fprintf(stderr, "xs_write for '%s' fail", string);
  70         goto out;
  71     }
  72     ret = 0;
  73
  74 out:
  75     free(path);
  76     xs_close(xs);
  77
  78     return ret;
  79 }
  80
  81 void xenstore_store_pv_console_info(int i, Chardev *chr)
  82 {
  83     if (i == 0) {
  84         store_dev_info(xen_domid, chr, "/console");
  85     } else {
  86         char buf[32];
  87         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  88         store_dev_info(xen_domid, chr, buf);
  89     }
  90 }
  91
  92
  93 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
  94 {
  95     char path[50];
  96
  97     if (xs == NULL) {
  98         fprintf(stderr, "xenstore connection not initialized\n");
  99         exit(1);
 100     }
 101
 102     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 103     if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
 104         fprintf(stderr, "error recording dm state\n");
 105         exit(1);
 106     }
 107 }
 108
 109
 110 static void xen_change_state_handler(void *opaque, int running,
 111                                      RunState state)
 112 {
 113     if (running) {
 114         /* record state running */
 115         xenstore_record_dm_state(xenstore, "running");
 116     }
 117 }
 118
 119 static int xen_init(MachineState *ms)
 120 {
 121     xen_xc = xc_interface_open(0, 0, 0);
 122     if (xen_xc == NULL) {
 123         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 124         return -1;
 125     }
 126     xen_fmem = xenforeignmemory_open(0, 0);
 127     if (xen_fmem == NULL) {
 128         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 129         xc_interface_close(xen_xc);
 130         return -1;
 131     }
 132     xen_dmod = xendevicemodel_open(0, 0);
 133     if (xen_dmod == NULL) {
 134         xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
 135         xenforeignmemory_close(xen_fmem);
 136         xc_interface_close(xen_xc);
 137         return -1;
 138     }
 139     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 140
 141     global_state_set_optional();
 142     savevm_skip_configuration();
 143     savevm_skip_section_footers();
 144
 145     return 0;
 146 }
 147
 148 static void xen_accel_class_init(ObjectClass *oc, void *data)
 149 {
 150     AccelClass *ac = ACCEL_CLASS(oc);
 151     ac->name = "Xen";
 152     ac->init_machine = xen_init;
 153     ac->allowed = &xen_allowed;
 154 }
 155
 156 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 157
 158 static const TypeInfo xen_accel_type = {
 159     .name = TYPE_XEN_ACCEL,
 160     .parent = TYPE_ACCEL,
 161     .class_init = xen_accel_class_init,
 162 };
 163
 164 static void xen_type_init(void)
 165 {
 166     type_register_static(&xen_accel_type);
 167 }
 168
 169 type_init(xen_type_init);