xen: Introduce the Xen mapcache

On IA32 host or IA32 PAE host, at present, generally, we can't create
an HVM guest with more than 2G memory, because generally it's almost
impossible for Qemu to find a large enough and consecutive virtual
address space to map an HVM guest's whole physical address space.
The attached patch fixes this issue using dynamic mapping based on
little blocks of memory.

Each call to qemu_get_ram_ptr makes a call to qemu_map_cache with the
lock option, so mapcache will not unmap these ram_ptr.

Blocks that do not belong to the RAM, but usually to a device ROM or to
a framebuffer, are handled in a separate function. So the whole RAMBlock
can be map.

Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
11 files changed
tree: d74d75e9b70fd2ced0daf705062260dab19b40c4
  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-user/
  13. net/
  14. pc-bios/
  15. QMP/
  16. roms/
  17. scripts/
  18. slirp/
  19. sysconfigs/
  20. target-alpha/
  21. target-arm/
  22. target-cris/
  23. target-i386/
  24. target-lm32/
  25. target-m68k/
  26. target-microblaze/
  27. target-mips/
  28. target-ppc/
  29. target-s390x/
  30. target-sh4/
  31. target-sparc/
  32. target-unicore32/
  33. tcg/
  34. tests/
  35. ui/
  36. .gitignore
  37. .gitmodules
  38. a.out.h
  39. acl.c
  40. acl.h
  41. aes.c
  42. aes.h
  43. aio.c
  44. alpha-dis.c
  45. alpha.ld
  46. arch_init.c
  47. arch_init.h
  48. arm-dis.c
  49. arm-semi.c
  50. arm.ld
  51. async.c
  52. balloon.c
  53. balloon.h
  54. bitmap.c
  55. bitmap.h
  56. bitops.c
  57. bitops.h
  58. block-migration.c
  59. block-migration.h
  60. block.c
  61. block.h
  62. block_int.h
  63. blockdev.c
  64. blockdev.h
  65. bswap.h
  66. bt-host.c
  67. bt-host.h
  68. bt-vhci.c
  69. buffered_file.c
  70. buffered_file.h
  71. cache-utils.c
  72. cache-utils.h
  73. Changelog
  74. check-qdict.c
  75. check-qfloat.c
  76. check-qint.c
  77. check-qjson.c
  78. check-qlist.c
  79. check-qstring.c
  80. cmd.c
  81. cmd.h
  82. CODING_STYLE
  83. compatfd.c
  84. compatfd.h
  85. config.h
  86. configure
  87. console.c
  88. console.h
  89. COPYING
  90. COPYING.LIB
  91. cpu-all.h
  92. cpu-common.h
  93. cpu-defs.h
  94. cpu-exec.c
  95. cpus.c
  96. cpus.h
  97. cris-dis.c
  98. cursor.c
  99. cursor_hidden.xpm
  100. cursor_left_ptr.xpm
  101. cutils.c
  102. def-helper.h
  103. device_tree.c
  104. device_tree.h
  105. dis-asm.h
  106. disas.c
  107. disas.h
  108. dma-helpers.c
  109. dma.h
  110. dyngen-exec.h
  111. elf.h
  112. envlist.c
  113. envlist.h
  114. exec-all.h
  115. exec.c
  116. gdbstub.c
  117. gdbstub.h
  118. gen-icount.h
  119. HACKING
  120. hmp-commands.hx
  121. host-utils.c
  122. host-utils.h
  123. hpet.h
  124. hppa-dis.c
  125. hppa.ld
  126. i386-dis.c
  127. i386.ld
  128. ia64-dis.c
  129. ia64.ld
  130. input.c
  131. iohandler.c
  132. ioport-user.c
  133. ioport.c
  134. ioport.h
  135. iorange.h
  136. iov.c
  137. iov.h
  138. json-lexer.c
  139. json-lexer.h
  140. json-parser.c
  141. json-parser.h
  142. json-streamer.c
  143. json-streamer.h
  144. kvm-all.c
  145. kvm-stub.c
  146. kvm.h
  147. libfdt_env.h
  148. LICENSE
  149. linux-aio.c
  150. m68k-dis.c
  151. m68k-semi.c
  152. m68k.ld
  153. MAINTAINERS
  154. Makefile
  155. Makefile.dis
  156. Makefile.hw
  157. Makefile.objs
  158. Makefile.target
  159. Makefile.user
  160. microblaze-dis.c
  161. migration-exec.c
  162. migration-fd.c
  163. migration-tcp.c
  164. migration-unix.c
  165. migration.c
  166. migration.h
  167. mips-dis.c
  168. mips.ld
  169. module.c
  170. module.h
  171. monitor.c
  172. monitor.h
  173. nbd.c
  174. nbd.h
  175. net.c
  176. net.h
  177. notify.c
  178. notify.h
  179. os-posix.c
  180. os-win32.c
  181. osdep.c
  182. osdep.h
  183. oslib-posix.c
  184. oslib-win32.c
  185. path.c
  186. pci-ids.txt
  187. pflib.c
  188. pflib.h
  189. poison.h
  190. posix-aio-compat.c
  191. ppc-dis.c
  192. ppc.ld
  193. ppc64.ld
  194. qbool.c
  195. qbool.h
  196. qdict-test-data.txt
  197. qdict.c
  198. qdict.h
  199. qemu-aio.h
  200. qemu-barrier.h
  201. qemu-char.c
  202. qemu-char.h
  203. qemu-common.h
  204. qemu-config.c
  205. qemu-config.h
  206. qemu-doc.texi
  207. qemu-error.c
  208. qemu-error.h
  209. qemu-img-cmds.hx
  210. qemu-img.c
  211. qemu-img.texi
  212. qemu-io.c
  213. qemu-lock.h
  214. qemu-log.h
  215. qemu-malloc.c
  216. qemu-nbd.c
  217. qemu-nbd.texi
  218. qemu-objects.h
  219. qemu-option.c
  220. qemu-option.h
  221. qemu-options.h
  222. qemu-options.hx
  223. qemu-os-posix.h
  224. qemu-os-win32.h
  225. qemu-progress.c
  226. qemu-queue.h
  227. qemu-sockets.c
  228. qemu-tech.texi
  229. qemu-thread-posix.c
  230. qemu-thread-posix.h
  231. qemu-thread-win32.c
  232. qemu-thread-win32.h
  233. qemu-thread.h
  234. qemu-timer-common.c
  235. qemu-timer.c
  236. qemu-timer.h
  237. qemu-tool.c
  238. qemu-x509.h
  239. qemu.sasl
  240. qemu_socket.h
  241. qerror.c
  242. qerror.h
  243. qfloat.c
  244. qfloat.h
  245. qint.c
  246. qint.h
  247. qjson.c
  248. qjson.h
  249. qlist.c
  250. qlist.h
  251. qmp-commands.hx
  252. qobject.h
  253. qstring.c
  254. qstring.h
  255. range.h
  256. readline.c
  257. readline.h
  258. README
  259. rules.mak
  260. rwhandler.c
  261. rwhandler.h
  262. s390-dis.c
  263. s390.ld
  264. savevm.c
  265. sh4-dis.c
  266. simpletrace.c
  267. simpletrace.h
  268. softmmu-semi.h
  269. softmmu_defs.h
  270. softmmu_exec.h
  271. softmmu_header.h
  272. softmmu_template.h
  273. sparc-dis.c
  274. sparc.ld
  275. sparc64.ld
  276. spice-qemu-char.c
  277. sysemu.h
  278. targphys.h
  279. tcg-runtime.c
  280. thunk.c
  281. thunk.h
  282. TODO
  283. trace-events
  284. translate-all.c
  285. uboot_image.h
  286. usb-bsd.c
  287. usb-linux.c
  288. usb-stub.c
  289. VERSION
  290. version.rc
  291. vgafont.h
  292. vl.c
  293. x86_64.ld
  294. xen-all.c
  295. xen-mapcache-stub.c
  296. xen-mapcache.c
  297. xen-mapcache.h
  298. xen-stub.c