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