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/i386/pc.h"
  13 #include "hw/xen/xen_backend.h"
  14 #include "qmp-commands.h"
  15 #include "sysemu/char.h"
  16 #include "sysemu/accel.h"
  17 #include "migration/migration.h"
  18
  19 //#define DEBUG_XEN
  20
  21 #ifdef DEBUG_XEN
  22 #define DPRINTF(fmt, ...) \
  23     do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
  24 #else
  25 #define DPRINTF(fmt, ...) \
  26     do { } while (0)
  27 #endif
  28
  29 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
  30 {
  31     struct xs_handle *xs = NULL;
  32     char *path = NULL;
  33     char *newpath = NULL;
  34     char *pts = NULL;
  35     int ret = -1;
  36
  37     /* Only continue if we're talking to a pty. */
  38     if (strncmp(cs->filename, "pty:", 4)) {
  39         return 0;
  40     }
  41     pts = cs->filename + 4;
  42
  43     /* We now have everything we need to set the xenstore entry. */
  44     xs = xs_open(0);
  45     if (xs == NULL) {
  46         fprintf(stderr, "Could not contact XenStore\n");
  47         goto out;
  48     }
  49
  50     path = xs_get_domain_path(xs, domid);
  51     if (path == NULL) {
  52         fprintf(stderr, "xs_get_domain_path() error\n");
  53         goto out;
  54     }
  55     newpath = realloc(path, (strlen(path) + strlen(string) +
  56                 strlen("/tty") + 1));
  57     if (newpath == NULL) {
  58         fprintf(stderr, "realloc error\n");
  59         goto out;
  60     }
  61     path = newpath;
  62
  63     strcat(path, string);
  64     strcat(path, "/tty");
  65     if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
  66         fprintf(stderr, "xs_write for '%s' fail", string);
  67         goto out;
  68     }
  69     ret = 0;
  70
  71 out:
  72     free(path);
  73     xs_close(xs);
  74
  75     return ret;
  76 }
  77
  78 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
  79 {
  80     if (i == 0) {
  81         store_dev_info(xen_domid, chr, "/console");
  82     } else {
  83         char buf[32];
  84         snprintf(buf, sizeof(buf), "/device/console/%d", i);
  85         store_dev_info(xen_domid, chr, buf);
  86     }
  87 }
  88
  89
  90 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
  91 {
  92     char path[50];
  93
  94     if (xs == NULL) {
  95         fprintf(stderr, "xenstore connection not initialized\n");
  96         exit(1);
  97     }
  98
  99     snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
 100     if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
 101         fprintf(stderr, "error recording dm state\n");
 102         exit(1);
 103     }
 104 }
 105
 106
 107 static void xen_change_state_handler(void *opaque, int running,
 108                                      RunState state)
 109 {
 110     if (running) {
 111         /* record state running */
 112         xenstore_record_dm_state(xenstore, "running");
 113     }
 114 }
 115
 116 static int xen_init(MachineState *ms)
 117 {
 118     PCMachineState *pcms = PC_MACHINE(ms);
 119
 120     /* Disable ACPI build because Xen handles it */
 121     pcms->acpi_build_enabled = false;
 122
 123     xen_xc = xc_interface_open(0, 0, 0);
 124     if (xen_xc == NULL) {
 125         xen_pv_printf(NULL, 0, "can't open xen interface\n");
 126         return -1;
 127     }
 128     xen_fmem = xenforeignmemory_open(0, 0);
 129     if (xen_fmem == NULL) {
 130         xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
 131         xc_interface_close(xen_xc);
 132         return -1;
 133     }
 134     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 135
 136     global_state_set_optional();
 137     savevm_skip_configuration();
 138     savevm_skip_section_footers();
 139
 140     return 0;
 141 }
 142
 143 static void xen_accel_class_init(ObjectClass *oc, void *data)
 144 {
 145     AccelClass *ac = ACCEL_CLASS(oc);
 146     ac->name = "Xen";
 147     ac->init_machine = xen_init;
 148     ac->allowed = &xen_allowed;
 149 }
 150
 151 #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
 152
 153 static const TypeInfo xen_accel_type = {
 154     .name = TYPE_XEN_ACCEL,
 155     .parent = TYPE_ACCEL,
 156     .class_init = xen_accel_class_init,
 157 };
 158
 159 static void xen_type_init(void)
 160 {
 161     type_register_static(&xen_accel_type);
 162 }
 163
 164 type_init(xen_type_init);