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qemu / qemu / 0f15423c3234335ca0dbeeae6d19db4699faca07
commit0f15423c3234335ca0dbeeae6d19db4699faca07[log] [tgz]
authorAnthony Liguori <aliguori@us.ibm.com>Mon Nov 14 15:09:45 2011 -0600
committerAnthony Liguori <aliguori@us.ibm.com>Mon Nov 21 14:58:48 2011 -0600
tree1850ee9f90d919d1b6209d5046a6246686902f63
parent38e0735eb76a1479917ef3501a208d4f70998494 [diff]
block: allow migration to work with image files (v3)

Image files have two types of data: immutable data that describes things like
image size, backing files, etc. and mutable data that includes offset and
reference count tables.

Today, image formats aggressively cache mutable data to improve performance.  In
some cases, this happens before a guest even starts.  When dealing with live
migration, since a file is open on two machines, the caching of meta data can
lead to data corruption.

This patch addresses this by introducing a mechanism to invalidate any cached
mutable data a block driver may have which is then used by the live migration
code.

NB, this still requires coherent shared storage.  Addressing migration without
coherent shared storage (i.e. NFS) requires additional work.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
4 files changed
tree: 1850ee9f90d919d1b6209d5046a6246686902f63
  1. audio/
  2. block/
  3. bsd-user/
  4. darwin-user/
  5. default-configs/
  6. docs/
  7. fpu/
  8. fsdev/
  9. gdb-xml/
  10. hw/
  11. libcacard/
  12. linux-headers/
  13. linux-user/
  14. net/
  15. pc-bios/
  16. qapi/
  17. qga/
  18. QMP/
  19. roms/
  20. scripts/
  21. slirp/
  22. sysconfigs/
  23. target-alpha/
  24. target-arm/
  25. target-cris/
  26. target-i386/
  27. target-lm32/
  28. target-m68k/
  29. target-microblaze/
  30. target-mips/
  31. target-ppc/
  32. target-s390x/
  33. target-sh4/
  34. target-sparc/
  35. target-unicore32/
  36. target-xtensa/
  37. tcg/
  38. tests/
  39. trace/
  40. ui/
  41. .gitignore
  42. .gitmodules
  43. a.out.h
  44. acl.c
  45. acl.h
  46. aes.c
  47. aes.h
  48. aio.c
  49. alpha-dis.c
  50. alpha.ld
  51. arch_init.c
  52. arch_init.h
  53. arm-dis.c
  54. arm-semi.c
  55. arm.ld
  56. async.c
  57. balloon.c
  58. balloon.h
  59. bitmap.c
  60. bitmap.h
  61. bitops.c
  62. bitops.h
  63. block-migration.c
  64. block-migration.h
  65. block.c
  66. block.h
  67. block_int.h
  68. blockdev.c
  69. blockdev.h
  70. bswap.h
  71. bt-host.c
  72. bt-host.h
  73. bt-vhci.c
  74. buffered_file.c
  75. buffered_file.h
  76. cache-utils.c
  77. cache-utils.h
  78. Changelog
  79. check-qdict.c
  80. check-qfloat.c
  81. check-qint.c
  82. check-qjson.c
  83. check-qlist.c
  84. check-qstring.c
  85. cmd.c
  86. cmd.h
  87. CODING_STYLE
  88. compatfd.c
  89. compatfd.h
  90. compiler.h
  91. config.h
  92. configure
  93. console.c
  94. console.h
  95. COPYING
  96. COPYING.LIB
  97. coroutine-gthread.c
  98. coroutine-ucontext.c
  99. coroutine-win32.c
  100. cpu-all.h
  101. cpu-common.h
  102. cpu-defs.h
  103. cpu-exec.c
  104. cpus.c
  105. cpus.h
  106. cris-dis.c
  107. cursor.c
  108. cursor_hidden.xpm
  109. cursor_left_ptr.xpm
  110. cutils.c
  111. def-helper.h
  112. device_tree.c
  113. device_tree.h
  114. dis-asm.h
  115. disas.c
  116. disas.h
  117. dma-helpers.c
  118. dma.h
  119. dyngen-exec.h
  120. elf.h
  121. envlist.c
  122. envlist.h
  123. error.c
  124. error.h
  125. error_int.h
  126. event_notifier.c
  127. event_notifier.h
  128. exec-all.h
  129. exec-memory.h
  130. exec.c
  131. gdbstub.c
  132. gdbstub.h
  133. gen-icount.h
  134. HACKING
  135. hmp-commands.hx
  136. hmp.c
  137. hmp.h
  138. host-utils.c
  139. host-utils.h
  140. hppa-dis.c
  141. hppa.ld
  142. i386-dis.c
  143. i386.ld
  144. ia64-dis.c
  145. ia64.ld
  146. input.c
  147. int128.h
  148. iohandler.c
  149. ioport-user.c
  150. ioport.c
  151. ioport.h
  152. iorange.h
  153. iov.c
  154. iov.h
  155. json-lexer.c
  156. json-lexer.h
  157. json-parser.c
  158. json-parser.h
  159. json-streamer.c
  160. json-streamer.h
  161. kvm-all.c
  162. kvm-stub.c
  163. kvm.h
  164. libfdt_env.h
  165. LICENSE
  166. linux-aio.c
  167. m68k-dis.c
  168. m68k-semi.c
  169. m68k.ld
  170. main-loop.c
  171. main-loop.h
  172. MAINTAINERS
  173. Makefile
  174. Makefile.dis
  175. Makefile.hw
  176. Makefile.objs
  177. Makefile.target
  178. Makefile.user
  179. memory.c
  180. memory.h
  181. microblaze-dis.c
  182. migration-exec.c
  183. migration-fd.c
  184. migration-tcp.c
  185. migration-unix.c
  186. migration.c
  187. migration.h
  188. mips-dis.c
  189. mips.ld
  190. module.c
  191. module.h
  192. monitor.c
  193. monitor.h
  194. nbd.c
  195. nbd.h
  196. net.c
  197. net.h
  198. notify.c
  199. notify.h
  200. os-posix.c
  201. os-win32.c
  202. osdep.c
  203. osdep.h
  204. oslib-posix.c
  205. oslib-win32.c
  206. path.c
  207. pci-ids.txt
  208. pflib.c
  209. pflib.h
  210. poison.h
  211. posix-aio-compat.c
  212. ppc-dis.c
  213. ppc.ld
  214. ppc64.ld
  215. qapi-schema-guest.json
  216. qapi-schema-test.json
  217. qapi-schema.json
  218. qbool.c
  219. qbool.h
  220. qdict-test-data.txt
  221. qdict.c
  222. qdict.h
  223. qemu-aio.h
  224. qemu-barrier.h
  225. qemu-char.c
  226. qemu-char.h
  227. qemu-common.h
  228. qemu-config.c
  229. qemu-config.h
  230. qemu-coroutine-int.h
  231. qemu-coroutine-lock.c
  232. qemu-coroutine.c
  233. qemu-coroutine.h
  234. qemu-doc.texi
  235. qemu-error.c
  236. qemu-error.h
  237. qemu-ga.c
  238. qemu-img-cmds.hx
  239. qemu-img.c
  240. qemu-img.texi
  241. qemu-io.c
  242. qemu-lock.h
  243. qemu-log.h
  244. qemu-nbd.c
  245. qemu-nbd.texi
  246. qemu-objects.h
  247. qemu-option.c
  248. qemu-option.h
  249. qemu-options.h
  250. qemu-options.hx
  251. qemu-os-posix.h
  252. qemu-os-win32.h
  253. qemu-progress.c
  254. qemu-queue.h
  255. qemu-sockets.c
  256. qemu-tech.texi
  257. qemu-thread-posix.c
  258. qemu-thread-posix.h
  259. qemu-thread-win32.c
  260. qemu-thread-win32.h
  261. qemu-thread.h
  262. qemu-timer-common.c
  263. qemu-timer.c
  264. qemu-timer.h
  265. qemu-tls.h
  266. qemu-tool.c
  267. qemu-x509.h
  268. qemu-xattr.h
  269. qemu.sasl
  270. qemu_socket.h
  271. qerror.c
  272. qerror.h
  273. qfloat.c
  274. qfloat.h
  275. qint.c
  276. qint.h
  277. qjson.c
  278. qjson.h
  279. qlist.c
  280. qlist.h
  281. qmp-commands.hx
  282. qmp.c
  283. qobject.h
  284. qstring.c
  285. qstring.h
  286. range.h
  287. readline.c
  288. readline.h
  289. README
  290. rules.mak
  291. s390-dis.c
  292. s390.ld
  293. savevm.c
  294. sh4-dis.c
  295. softmmu-semi.h
  296. softmmu_defs.h
  297. softmmu_exec.h
  298. softmmu_header.h
  299. softmmu_template.h
  300. sparc-dis.c
  301. sparc.ld
  302. sparc64.ld
  303. spice-qemu-char.c
  304. sysemu.h
  305. targphys.h
  306. tcg-runtime.c
  307. tci-dis.c
  308. tci.c
  309. test-coroutine.c
  310. test-qmp-commands.c
  311. test-visitor.c
  312. thunk.c
  313. thunk.h
  314. TODO
  315. trace-events
  316. translate-all.c
  317. uboot_image.h
  318. usb-bsd.c
  319. usb-linux.c
  320. usb-redir.c
  321. usb-stub.c
  322. user-exec.c
  323. VERSION
  324. version.rc
  325. vgafont.h
  326. vl.c
  327. x86_64.ld
  328. xen-all.c
  329. xen-mapcache.c
  330. xen-mapcache.h
  331. xen-stub.c
  332. xtensa-semi.c