1 | /* |
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2 | * This file is subject to the terms and conditions of the GNU General |
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3 | * Public License. See the file "COPYING" in the main directory of |
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4 | * this archive for more details. |
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5 | * |
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6 | * Copyright (C) 2006 Christian Limpach |
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7 | * Copyright (C) 2006 XenSource Ltd. |
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8 | * |
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9 | */ |
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10 | |
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11 | #include "vl.h" |
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12 | #include "block_int.h" |
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13 | #include <unistd.h> |
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14 | #include <sys/ipc.h> |
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15 | #include <sys/shm.h> |
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16 | #include <sys/types.h> |
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17 | #include <sys/stat.h> |
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18 | #include <fcntl.h> |
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19 | |
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20 | static struct xs_handle *xsh = NULL; |
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21 | static char *media_filename[MAX_DISKS + MAX_SCSI_DISKS]; |
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22 | static QEMUTimer *insert_timer = NULL; |
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23 | |
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24 | #define UWAIT_MAX (30*1000000) /* thirty seconds */ |
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25 | #define UWAIT (100000) /* 1/10th second */ |
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26 | |
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27 | static int pasprintf(char **buf, const char *fmt, ...) |
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28 | { |
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29 | va_list ap; |
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30 | int ret = 0; |
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31 | |
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32 | if (*buf) |
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33 | free(*buf); |
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34 | va_start(ap, fmt); |
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35 | if (vasprintf(buf, fmt, ap) == -1) { |
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36 | buf = NULL; |
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37 | ret = -1; |
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38 | } |
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39 | va_end(ap); |
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40 | return ret; |
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41 | } |
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42 | |
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43 | static void insert_media(void *opaque) |
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44 | { |
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45 | int i; |
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46 | |
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47 | for (i = 0; i < MAX_DISKS + MAX_SCSI_DISKS; i++) { |
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48 | if (media_filename[i] && bs_table[i]) { |
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49 | do_change(bs_table[i]->device_name, media_filename[i]); |
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50 | free(media_filename[i]); |
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51 | media_filename[i] = NULL; |
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52 | } |
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53 | } |
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54 | } |
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55 | |
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56 | void xenstore_check_new_media_present(int timeout) |
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57 | { |
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58 | |
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59 | if (insert_timer == NULL) |
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60 | insert_timer = qemu_new_timer(rt_clock, insert_media, NULL); |
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61 | qemu_mod_timer(insert_timer, qemu_get_clock(rt_clock) + timeout); |
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62 | } |
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63 | |
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64 | static void waitForDevice(char *fn) |
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65 | { |
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66 | struct stat sbuf; |
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67 | int status; |
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68 | int uwait = UWAIT_MAX; |
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69 | |
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70 | do { |
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71 | status = stat(fn, &sbuf); |
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72 | if (!status) break; |
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73 | usleep(UWAIT); |
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74 | uwait -= UWAIT; |
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75 | } while (uwait > 0); |
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76 | |
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77 | return; |
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78 | } |
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79 | |
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80 | void xenstore_parse_domain_config(int domid) |
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81 | { |
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82 | char **e = NULL; |
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83 | char *buf = NULL, *path; |
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84 | char *fpath = NULL, *bpath = NULL, |
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85 | *dev = NULL, *params = NULL, *type = NULL; |
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86 | int i, is_scsi; |
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87 | unsigned int len, num, hd_index; |
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88 | |
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89 | for(i = 0; i < MAX_DISKS + MAX_SCSI_DISKS; i++) |
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90 | media_filename[i] = NULL; |
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91 | |
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92 | xsh = xs_daemon_open(); |
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93 | if (xsh == NULL) { |
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94 | fprintf(logfile, "Could not contact xenstore for domain config\n"); |
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95 | return; |
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96 | } |
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97 | |
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98 | path = xs_get_domain_path(xsh, domid); |
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99 | if (path == NULL) { |
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100 | fprintf(logfile, "xs_get_domain_path() error\n"); |
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101 | goto out; |
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102 | } |
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103 | |
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104 | if (pasprintf(&buf, "%s/device/vbd", path) == -1) |
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105 | goto out; |
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106 | |
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107 | e = xs_directory(xsh, XBT_NULL, buf, &num); |
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108 | if (e == NULL) |
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109 | goto out; |
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110 | |
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111 | for (i = 0; i < num; i++) { |
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112 | /* read the backend path */ |
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113 | if (pasprintf(&buf, "%s/device/vbd/%s/backend", path, e[i]) == -1) |
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114 | continue; |
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115 | free(bpath); |
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116 | bpath = xs_read(xsh, XBT_NULL, buf, &len); |
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117 | if (bpath == NULL) |
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118 | continue; |
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119 | /* read the name of the device */ |
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120 | if (pasprintf(&buf, "%s/dev", bpath) == -1) |
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121 | continue; |
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122 | free(dev); |
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123 | dev = xs_read(xsh, XBT_NULL, buf, &len); |
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124 | if (dev == NULL) |
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125 | continue; |
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126 | is_scsi = !strncmp(dev, "sd", 2); |
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127 | if ((strncmp(dev, "hd", 2) && !is_scsi) || strlen(dev) != 3 ) |
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128 | continue; |
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129 | hd_index = dev[2] - 'a'; |
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130 | if (hd_index >= (is_scsi ? MAX_SCSI_DISKS : MAX_DISKS)) |
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131 | continue; |
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132 | /* read the type of the device */ |
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133 | if (pasprintf(&buf, "%s/device/vbd/%s/device-type", path, e[i]) == -1) |
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134 | continue; |
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135 | free(type); |
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136 | type = xs_read(xsh, XBT_NULL, buf, &len); |
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137 | if (pasprintf(&buf, "%s/params", bpath) == -1) |
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138 | continue; |
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139 | free(params); |
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140 | params = xs_read(xsh, XBT_NULL, buf, &len); |
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141 | if (params == NULL) |
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142 | continue; |
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143 | /* |
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144 | * check if device has a phantom vbd; the phantom is hooked |
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145 | * to the frontend device (for ease of cleanup), so lookup |
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146 | * the frontend device, and see if there is a phantom_vbd |
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147 | * if there is, we will use resolution as the filename |
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148 | */ |
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149 | if (pasprintf(&buf, "%s/device/vbd/%s/phantom_vbd", path, e[i]) == -1) |
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150 | continue; |
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151 | free(fpath); |
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152 | fpath = xs_read(xsh, XBT_NULL, buf, &len); |
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153 | if (fpath) { |
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154 | if (pasprintf(&buf, "%s/dev", fpath) == -1) |
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155 | continue; |
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156 | free(params); |
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157 | params = xs_read(xsh, XBT_NULL, buf , &len); |
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158 | if (params) { |
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159 | /* |
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160 | * wait for device, on timeout silently fail because we will |
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161 | * fail to open below |
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162 | */ |
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163 | waitForDevice(params); |
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164 | } |
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165 | } |
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166 | |
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167 | bs_table[hd_index + (is_scsi ? MAX_DISKS : 0)] = bdrv_new(dev); |
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168 | /* check if it is a cdrom */ |
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169 | if (type && !strcmp(type, "cdrom")) { |
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170 | bdrv_set_type_hint(bs_table[hd_index], BDRV_TYPE_CDROM); |
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171 | if (pasprintf(&buf, "%s/params", bpath) != -1) |
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172 | xs_watch(xsh, buf, dev); |
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173 | } |
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174 | /* open device now if media present */ |
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175 | if (params[0]) { |
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176 | if (bdrv_open(bs_table[hd_index + (is_scsi ? MAX_DISKS : 0)], |
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177 | params, 0 /* snapshot */) < 0) |
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178 | fprintf(stderr, "qemu: could not open hard disk image '%s'\n", |
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179 | params); |
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180 | } |
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181 | } |
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182 | |
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183 | /* Set a watch for log-dirty requests from the migration tools */ |
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184 | if (pasprintf(&buf, "%s/logdirty/next-active", path) != -1) { |
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185 | xs_watch(xsh, buf, "logdirty"); |
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186 | fprintf(logfile, "Watching %s\n", buf); |
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187 | } |
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188 | |
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189 | |
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190 | out: |
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191 | free(type); |
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192 | free(params); |
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193 | free(dev); |
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194 | free(bpath); |
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195 | free(buf); |
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196 | free(path); |
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197 | free(e); |
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198 | return; |
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199 | } |
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200 | |
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201 | int xenstore_fd(void) |
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202 | { |
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203 | if (xsh) |
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204 | return xs_fileno(xsh); |
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205 | return -1; |
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206 | } |
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207 | |
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208 | unsigned long *logdirty_bitmap = NULL; |
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209 | unsigned long logdirty_bitmap_size; |
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210 | extern int vga_ram_size, bios_size; |
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211 | |
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212 | void xenstore_process_logdirty_event(void) |
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213 | { |
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214 | char *act; |
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215 | static char *active_path = NULL; |
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216 | static char *next_active_path = NULL; |
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217 | static char *seg = NULL; |
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218 | unsigned int len; |
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219 | int i; |
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220 | |
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221 | fprintf(logfile, "Triggered log-dirty buffer switch\n"); |
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222 | |
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223 | if (!seg) { |
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224 | char *path, *p, *key_ascii, key_terminated[17] = {0,}; |
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225 | key_t key; |
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226 | int shmid; |
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227 | |
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228 | /* Find and map the shared memory segment for log-dirty bitmaps */ |
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229 | if (!(path = xs_get_domain_path(xsh, domid))) { |
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230 | fprintf(logfile, "Log-dirty: can't get domain path in store\n"); |
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231 | exit(1); |
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232 | } |
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233 | if (!(path = realloc(path, strlen(path) |
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234 | + strlen("/logdirty/next-active") + 1))) { |
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235 | fprintf(logfile, "Log-dirty: out of memory\n"); |
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236 | exit(1); |
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237 | } |
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238 | strcat(path, "/logdirty/"); |
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239 | p = path + strlen(path); |
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240 | strcpy(p, "key"); |
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241 | |
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242 | key_ascii = xs_read(xsh, XBT_NULL, path, &len); |
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243 | if (!key_ascii) { |
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244 | /* No key yet: wait for the next watch */ |
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245 | free(path); |
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246 | return; |
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247 | } |
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248 | strncpy(key_terminated, key_ascii, 16); |
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249 | free(key_ascii); |
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250 | key = (key_t) strtoull(key_terminated, NULL, 16); |
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251 | |
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252 | /* Figure out how bit the log-dirty bitmaps are */ |
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253 | logdirty_bitmap_size = xc_memory_op(xc_handle, |
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254 | XENMEM_maximum_gpfn, &domid) + 1; |
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255 | logdirty_bitmap_size = ((logdirty_bitmap_size + HOST_LONG_BITS - 1) |
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256 | / HOST_LONG_BITS); /* longs */ |
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257 | logdirty_bitmap_size *= sizeof (unsigned long); /* bytes */ |
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258 | |
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259 | /* Map the shared-memory segment */ |
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260 | if ((shmid = shmget(key, |
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261 | 2 * logdirty_bitmap_size, |
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262 | S_IRUSR|S_IWUSR)) == -1 |
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263 | || (seg = shmat(shmid, NULL, 0)) == (void *)-1) { |
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264 | fprintf(logfile, "Log-dirty: can't map segment %16.16llx (%s)\n", |
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265 | (unsigned long long) key, strerror(errno)); |
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266 | exit(1); |
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267 | } |
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268 | |
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269 | fprintf(logfile, "Log-dirty: mapped segment at %p\n", seg); |
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270 | |
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271 | /* Double-check that the bitmaps are the size we expect */ |
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272 | if (logdirty_bitmap_size != *(uint32_t *)seg) { |
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273 | fprintf(logfile, "Log-dirty: got %u, calc %lu\n", |
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274 | *(uint32_t *)seg, logdirty_bitmap_size); |
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275 | return; |
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276 | } |
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277 | |
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278 | /* Remember the paths for the next-active and active entries */ |
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279 | strcpy(p, "active"); |
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280 | if (!(active_path = strdup(path))) { |
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281 | fprintf(logfile, "Log-dirty: out of memory\n"); |
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282 | exit(1); |
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283 | } |
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284 | strcpy(p, "next-active"); |
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285 | if (!(next_active_path = strdup(path))) { |
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286 | fprintf(logfile, "Log-dirty: out of memory\n"); |
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287 | exit(1); |
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288 | } |
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289 | free(path); |
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290 | } |
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291 | |
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292 | /* Read the required active buffer from the store */ |
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293 | act = xs_read(xsh, XBT_NULL, next_active_path, &len); |
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294 | if (!act) { |
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295 | fprintf(logfile, "Log-dirty: can't read next-active\n"); |
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296 | exit(1); |
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297 | } |
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298 | |
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299 | /* Switch buffers */ |
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300 | i = act[0] - '0'; |
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301 | if (i != 0 && i != 1) { |
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302 | fprintf(logfile, "Log-dirty: bad next-active entry: %s\n", act); |
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303 | exit(1); |
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304 | } |
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305 | logdirty_bitmap = (unsigned long *)(seg + i * logdirty_bitmap_size); |
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306 | |
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307 | /* Ack that we've switched */ |
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308 | xs_write(xsh, XBT_NULL, active_path, act, len); |
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309 | free(act); |
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310 | } |
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311 | |
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312 | |
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313 | |
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314 | void xenstore_process_event(void *opaque) |
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315 | { |
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316 | char **vec, *image = NULL; |
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317 | unsigned int len, num, hd_index; |
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318 | |
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319 | vec = xs_read_watch(xsh, &num); |
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320 | if (!vec) |
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321 | return; |
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322 | |
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323 | if (!strcmp(vec[XS_WATCH_TOKEN], "logdirty")) { |
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324 | xenstore_process_logdirty_event(); |
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325 | goto out; |
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326 | } |
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327 | |
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328 | if (strncmp(vec[XS_WATCH_TOKEN], "hd", 2) || |
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329 | strlen(vec[XS_WATCH_TOKEN]) != 3) |
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330 | goto out; |
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331 | hd_index = vec[XS_WATCH_TOKEN][2] - 'a'; |
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332 | image = xs_read(xsh, XBT_NULL, vec[XS_WATCH_PATH], &len); |
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333 | if (image == NULL || !strcmp(image, bs_table[hd_index]->filename)) |
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334 | goto out; /* gone or identical */ |
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335 | |
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336 | do_eject(0, vec[XS_WATCH_TOKEN]); |
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337 | bs_table[hd_index]->filename[0] = 0; |
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338 | if (media_filename[hd_index]) { |
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339 | free(media_filename[hd_index]); |
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340 | media_filename[hd_index] = NULL; |
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341 | } |
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342 | |
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343 | if (image[0]) { |
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344 | media_filename[hd_index] = strdup(image); |
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345 | xenstore_check_new_media_present(5000); |
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346 | } |
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347 | |
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348 | out: |
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349 | free(image); |
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350 | free(vec); |
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351 | } |
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352 | |
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353 | void xenstore_write_vncport(int display) |
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354 | { |
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355 | char *buf = NULL, *path; |
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356 | char *portstr = NULL; |
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357 | |
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358 | if (xsh == NULL) |
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359 | return; |
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360 | |
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361 | path = xs_get_domain_path(xsh, domid); |
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362 | if (path == NULL) { |
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363 | fprintf(logfile, "xs_get_domain_path() error\n"); |
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364 | goto out; |
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365 | } |
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366 | |
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367 | if (pasprintf(&buf, "%s/console/vnc-port", path) == -1) |
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368 | goto out; |
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369 | |
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370 | if (pasprintf(&portstr, "%d", 5900 + display) == -1) |
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371 | goto out; |
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372 | |
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373 | if (xs_write(xsh, XBT_NULL, buf, portstr, strlen(portstr)) == 0) |
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374 | fprintf(logfile, "xs_write() vncport failed\n"); |
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375 | |
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376 | out: |
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377 | free(portstr); |
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378 | free(buf); |
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379 | } |
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380 | |
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381 | int xenstore_read_vncpasswd(int domid) |
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382 | { |
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383 | extern char vncpasswd[64]; |
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384 | char *buf = NULL, *path, *uuid = NULL, *passwd = NULL; |
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385 | unsigned int i, len, rc = 0; |
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386 | |
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387 | if (xsh == NULL) { |
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388 | return -1; |
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389 | } |
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390 | |
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391 | path = xs_get_domain_path(xsh, domid); |
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392 | if (path == NULL) { |
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393 | fprintf(logfile, "xs_get_domain_path() error. domid %d.\n", domid); |
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394 | return -1; |
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395 | } |
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396 | |
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397 | pasprintf(&buf, "%s/vm", path); |
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398 | uuid = xs_read(xsh, XBT_NULL, buf, &len); |
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399 | if (uuid == NULL) { |
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400 | fprintf(logfile, "xs_read(): uuid get error. %s.\n", buf); |
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401 | free(path); |
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402 | return -1; |
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403 | } |
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404 | |
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405 | pasprintf(&buf, "%s/vncpasswd", uuid); |
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406 | passwd = xs_read(xsh, XBT_NULL, buf, &len); |
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407 | if (passwd == NULL) { |
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408 | fprintf(logfile, "xs_read(): vncpasswd get error. %s.\n", buf); |
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409 | free(uuid); |
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410 | free(path); |
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411 | return rc; |
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412 | } |
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413 | |
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414 | for (i=0; i<len && i<63; i++) { |
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415 | vncpasswd[i] = passwd[i]; |
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416 | passwd[i] = '\0'; |
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417 | } |
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418 | vncpasswd[len] = '\0'; |
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419 | pasprintf(&buf, "%s/vncpasswd", uuid); |
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420 | if (xs_write(xsh, XBT_NULL, buf, passwd, len) == 0) { |
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421 | fprintf(logfile, "xs_write() vncpasswd failed.\n"); |
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422 | rc = -1; |
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423 | } |
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424 | |
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425 | free(passwd); |
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426 | free(uuid); |
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427 | free(path); |
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428 | |
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429 | return rc; |
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430 | } |
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431 | |
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432 | |
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433 | /* |
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434 | * get all device instances of a certain type |
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435 | */ |
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436 | char **xenstore_domain_get_devices(struct xs_handle *handle, |
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437 | const char *devtype, unsigned int *num) |
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438 | { |
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439 | char *path; |
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440 | char *buf = NULL; |
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441 | char **e = NULL; |
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442 | |
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443 | path = xs_get_domain_path(handle, domid); |
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444 | if (path == NULL) |
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445 | goto out; |
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446 | |
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447 | if (pasprintf(&buf, "%s/device/%s", path,devtype) == -1) |
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448 | goto out; |
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449 | |
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450 | e = xs_directory(handle, XBT_NULL, buf, num); |
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451 | |
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452 | out: |
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453 | free(path); |
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454 | free(buf); |
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455 | return e; |
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456 | } |
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457 | |
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458 | /* |
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459 | * Check whether a domain has devices of the given type |
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460 | */ |
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461 | int xenstore_domain_has_devtype(struct xs_handle *handle, const char *devtype) |
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462 | { |
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463 | int rc = 0; |
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464 | unsigned int num; |
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465 | char **e = xenstore_domain_get_devices(handle, devtype, &num); |
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466 | if (e) |
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467 | rc = 1; |
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468 | free(e); |
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469 | return rc; |
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470 | } |
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471 | |
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472 | /* |
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473 | * Function that creates a path to a variable of an instance of a |
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474 | * certain device |
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475 | */ |
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476 | static char *get_device_variable_path(const char *devtype, const char *inst, |
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477 | const char *var) |
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478 | { |
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479 | char *buf = NULL; |
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480 | if (pasprintf(&buf, "/local/domain/0/backend/%s/%d/%s/%s", |
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481 | devtype, |
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482 | domid, |
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483 | inst, |
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484 | var) == -1) { |
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485 | free(buf); |
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486 | buf = NULL; |
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487 | } |
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488 | return buf; |
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489 | } |
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490 | |
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491 | char *xenstore_backend_read_variable(struct xs_handle *handle, |
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492 | const char *devtype, const char *inst, |
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493 | const char *var) |
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494 | { |
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495 | char *value = NULL; |
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496 | char *buf = NULL; |
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497 | unsigned int len; |
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498 | |
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499 | buf = get_device_variable_path(devtype, inst, var); |
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500 | if (NULL == buf) |
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501 | goto out; |
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502 | |
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503 | value = xs_read(handle, XBT_NULL, buf, &len); |
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504 | |
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505 | free(buf); |
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506 | |
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507 | out: |
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508 | return value; |
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509 | } |
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510 | |
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511 | /* |
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512 | Read the hotplug status variable from the backend given the type |
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513 | of device and its instance. |
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514 | */ |
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515 | char *xenstore_read_hotplug_status(struct xs_handle *handle, |
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516 | const char *devtype, const char *inst) |
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517 | { |
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518 | return xenstore_backend_read_variable(handle, devtype, inst, |
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519 | "hotplug-status"); |
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520 | } |
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521 | |
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522 | /* |
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523 | Subscribe to the hotplug status of a device given the type of device and |
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524 | its instance. |
---|
525 | In case an error occurrs, a negative number is returned. |
---|
526 | */ |
---|
527 | int xenstore_subscribe_to_hotplug_status(struct xs_handle *handle, |
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528 | const char *devtype, |
---|
529 | const char *inst, |
---|
530 | const char *token) |
---|
531 | { |
---|
532 | int rc = 0; |
---|
533 | char *path = get_device_variable_path(devtype, inst, "hotplug-status"); |
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534 | |
---|
535 | if (path == NULL) |
---|
536 | return -1; |
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537 | |
---|
538 | if (0 == xs_watch(handle, path, token)) |
---|
539 | rc = -2; |
---|
540 | |
---|
541 | free(path); |
---|
542 | |
---|
543 | return rc; |
---|
544 | } |
---|
545 | |
---|
546 | /* |
---|
547 | * Unsubscribe from a subscription to the status of a hotplug variable of |
---|
548 | * a device. |
---|
549 | */ |
---|
550 | int xenstore_unsubscribe_from_hotplug_status(struct xs_handle *handle, |
---|
551 | const char *devtype, |
---|
552 | const char *inst, |
---|
553 | const char *token) |
---|
554 | { |
---|
555 | int rc = 0; |
---|
556 | char *path; |
---|
557 | path = get_device_variable_path(devtype, inst, "hotplug-status"); |
---|
558 | if (path == NULL) |
---|
559 | return -1; |
---|
560 | |
---|
561 | if (0 == xs_unwatch(handle, path, token)) |
---|
562 | rc = -2; |
---|
563 | |
---|
564 | free(path); |
---|
565 | |
---|
566 | return rc; |
---|
567 | } |
---|
568 | |
---|
569 | char *xenstore_vm_read(int domid, char *key, int *len) |
---|
570 | { |
---|
571 | char *buf = NULL, *path = NULL, *value = NULL; |
---|
572 | |
---|
573 | if (xsh == NULL) |
---|
574 | goto out; |
---|
575 | |
---|
576 | path = xs_get_domain_path(xsh, domid); |
---|
577 | if (path == NULL) { |
---|
578 | fprintf(logfile, "xs_get_domain_path(%d): error\n", domid); |
---|
579 | goto out; |
---|
580 | } |
---|
581 | |
---|
582 | pasprintf(&buf, "%s/vm", path); |
---|
583 | free(path); |
---|
584 | path = xs_read(xsh, XBT_NULL, buf, NULL); |
---|
585 | if (path == NULL) { |
---|
586 | fprintf(logfile, "xs_read(%s): read error\n", buf); |
---|
587 | goto out; |
---|
588 | } |
---|
589 | |
---|
590 | pasprintf(&buf, "%s/%s", path, key); |
---|
591 | value = xs_read(xsh, XBT_NULL, buf, len); |
---|
592 | if (value == NULL) { |
---|
593 | fprintf(logfile, "xs_read(%s): read error\n", buf); |
---|
594 | goto out; |
---|
595 | } |
---|
596 | |
---|
597 | out: |
---|
598 | free(path); |
---|
599 | free(buf); |
---|
600 | return value; |
---|
601 | } |
---|
602 | |
---|
603 | int xenstore_vm_write(int domid, char *key, char *value) |
---|
604 | { |
---|
605 | char *buf = NULL, *path = NULL; |
---|
606 | int rc = -1; |
---|
607 | |
---|
608 | if (xsh == NULL) |
---|
609 | goto out; |
---|
610 | |
---|
611 | path = xs_get_domain_path(xsh, domid); |
---|
612 | if (path == NULL) { |
---|
613 | fprintf(logfile, "xs_get_domain_path: error\n"); |
---|
614 | goto out; |
---|
615 | } |
---|
616 | |
---|
617 | pasprintf(&buf, "%s/vm", path); |
---|
618 | free(path); |
---|
619 | path = xs_read(xsh, XBT_NULL, buf, NULL); |
---|
620 | if (path == NULL) { |
---|
621 | fprintf(logfile, "xs_read(%s): read error\n", buf); |
---|
622 | goto out; |
---|
623 | } |
---|
624 | |
---|
625 | pasprintf(&buf, "%s/%s", path, key); |
---|
626 | rc = xs_write(xsh, XBT_NULL, buf, value, strlen(value)); |
---|
627 | if (rc) { |
---|
628 | fprintf(logfile, "xs_write(%s, %s): write error\n", buf, key); |
---|
629 | goto out; |
---|
630 | } |
---|
631 | |
---|
632 | out: |
---|
633 | free(path); |
---|
634 | free(buf); |
---|
635 | return rc; |
---|
636 | } |
---|