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qemu / qemu / bd28f835652e396841bb73080a07bcc08fe21bf0
commitbd28f835652e396841bb73080a07bcc08fe21bf0[log] [tgz]
authorKevin Wolf <kwolf@redhat.com>Mon Sep 13 18:08:52 2010 +0200
committerKevin Wolf <kwolf@redhat.com>Tue Sep 21 15:39:42 2010 +0200
tree7f8b026a2beb604f1f6b7f47c90b13b734df4f44
parentb8a83a4f79ca4cd0689117b119ffaa1a91b00d52 [diff]
qcow2: Avoid bounce buffers for AIO read requests

qcow2 used to use bounce buffers for any AIO requests. This does not only imply
unnecessary copying, but also unbounded allocations which should be avoided.

This patch removes bounce buffers from the normal AIO read path, and constrains
them to a constant size for encrypted images.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
3 files changed
tree: 7f8b026a2beb604f1f6b7f47c90b13b734df4f44
  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. linux-user/
  12. net/
  13. pc-bios/
  14. QMP/
  15. roms/
  16. slirp/
  17. sysconfigs/
  18. target-alpha/
  19. target-arm/
  20. target-cris/
  21. target-i386/
  22. target-m68k/
  23. target-microblaze/
  24. target-mips/
  25. target-ppc/
  26. target-s390x/
  27. target-sh4/
  28. target-sparc/
  29. tcg/
  30. tests/
  31. ui/
  32. .gitignore
  33. .gitmodules
  34. a.out.h
  35. acl.c
  36. acl.h
  37. aes.c
  38. aes.h
  39. aio.c
  40. alpha-dis.c
  41. alpha.ld
  42. arch_init.c
  43. arch_init.h
  44. arm-dis.c
  45. arm-semi.c
  46. arm.ld
  47. async.c
  48. balloon.c
  49. balloon.h
  50. block-migration.c
  51. block-migration.h
  52. block.c
  53. block.h
  54. block_int.h
  55. blockdev.c
  56. blockdev.h
  57. bswap.h
  58. bt-host.c
  59. bt-host.h
  60. bt-vhci.c
  61. buffered_file.c
  62. buffered_file.h
  63. cache-utils.c
  64. cache-utils.h
  65. Changelog
  66. check-qdict.c
  67. check-qfloat.c
  68. check-qint.c
  69. check-qjson.c
  70. check-qlist.c
  71. check-qstring.c
  72. cmd.c
  73. cmd.h
  74. CODING_STYLE
  75. config.h
  76. configure
  77. console.c
  78. console.h
  79. COPYING
  80. COPYING.LIB
  81. cpu-all.h
  82. cpu-common.h
  83. cpu-defs.h
  84. cpu-exec.c
  85. cpus.c
  86. cpus.h
  87. create_config
  88. cris-dis.c
  89. cursor.c
  90. cursor_hidden.xpm
  91. cursor_left_ptr.xpm
  92. cutils.c
  93. def-helper.h
  94. device_tree.c
  95. device_tree.h
  96. dis-asm.h
  97. disas.c
  98. disas.h
  99. dma-helpers.c
  100. dma.h
  101. dyngen-exec.h
  102. elf.h
  103. envlist.c
  104. envlist.h
  105. exec-all.h
  106. exec.c
  107. feature_to_c.sh
  108. gdbstub.c
  109. gdbstub.h
  110. gen-icount.h
  111. HACKING
  112. host-utils.c
  113. host-utils.h
  114. hpet.h
  115. hppa-dis.c
  116. hppa.ld
  117. hxtool
  118. i386-dis.c
  119. i386.ld
  120. ia64-dis.c
  121. ia64.ld
  122. input.c
  123. ioport-user.c
  124. ioport.c
  125. ioport.h
  126. iov.c
  127. iov.h
  128. json-lexer.c
  129. json-lexer.h
  130. json-parser.c
  131. json-parser.h
  132. json-streamer.c
  133. json-streamer.h
  134. kvm-all.c
  135. kvm-stub.c
  136. kvm.h
  137. libfdt_env.h
  138. LICENSE
  139. linux-aio.c
  140. m68k-dis.c
  141. m68k-semi.c
  142. m68k.ld
  143. MAINTAINERS
  144. Makefile
  145. Makefile.dis
  146. Makefile.hw
  147. Makefile.objs
  148. Makefile.target
  149. Makefile.user
  150. microblaze-dis.c
  151. migration-exec.c
  152. migration-fd.c
  153. migration-tcp.c
  154. migration-unix.c
  155. migration.c
  156. migration.h
  157. mips-dis.c
  158. mips.ld
  159. module.c
  160. module.h
  161. monitor.c
  162. monitor.h
  163. nbd.c
  164. nbd.h
  165. net-checksum.c
  166. net.c
  167. net.h
  168. notify.c
  169. notify.h
  170. os-posix.c
  171. os-win32.c
  172. osdep.c
  173. osdep.h
  174. path.c
  175. pci-ids.txt
  176. poison.h
  177. posix-aio-compat.c
  178. ppc-dis.c
  179. ppc.ld
  180. ppc64.ld
  181. qbool.c
  182. qbool.h
  183. qdict-test-data.txt
  184. qdict.c
  185. qdict.h
  186. qemu-aio.h
  187. qemu-barrier.h
  188. qemu-binfmt-conf.sh
  189. qemu-char.c
  190. qemu-char.h
  191. qemu-common.h
  192. qemu-config.c
  193. qemu-config.h
  194. qemu-doc.texi
  195. qemu-error.c
  196. qemu-error.h
  197. qemu-img-cmds.hx
  198. qemu-img.c
  199. qemu-img.texi
  200. qemu-io.c
  201. qemu-lock.h
  202. qemu-log.h
  203. qemu-malloc.c
  204. qemu-monitor.hx
  205. qemu-nbd.c
  206. qemu-nbd.texi
  207. qemu-objects.h
  208. qemu-option.c
  209. qemu-option.h
  210. qemu-options.h
  211. qemu-options.hx
  212. qemu-os-posix.h
  213. qemu-os-win32.h
  214. qemu-queue.h
  215. qemu-sockets.c
  216. qemu-tech.texi
  217. qemu-thread.c
  218. qemu-thread.h
  219. qemu-timer.c
  220. qemu-timer.h
  221. qemu-tool.c
  222. qemu-x509.h
  223. qemu.sasl
  224. qemu_socket.h
  225. qerror.c
  226. qerror.h
  227. qfloat.c
  228. qfloat.h
  229. qint.c
  230. qint.h
  231. qjson.c
  232. qjson.h
  233. qlist.c
  234. qlist.h
  235. qobject.h
  236. qstring.c
  237. qstring.h
  238. range.h
  239. readline.c
  240. readline.h
  241. README
  242. rules.mak
  243. rwhandler.c
  244. rwhandler.h
  245. s390-dis.c
  246. s390.ld
  247. savevm.c
  248. sh4-dis.c
  249. simpletrace.c
  250. simpletrace.h
  251. simpletrace.py
  252. softmmu-semi.h
  253. softmmu_defs.h
  254. softmmu_exec.h
  255. softmmu_header.h
  256. softmmu_template.h
  257. sparc-dis.c
  258. sparc.ld
  259. sparc64.ld
  260. sysemu.h
  261. targphys.h
  262. tcg-runtime.c
  263. texi2pod.pl
  264. thunk.c
  265. thunk.h
  266. TODO
  267. trace-events
  268. tracetool
  269. translate-all.c
  270. uboot_image.h
  271. usb-bsd.c
  272. usb-linux.c
  273. usb-stub.c
  274. VERSION
  275. vgafont.h
  276. vl.c
  277. x86_64.ld