VirtIO: Fix QEMU crash during Windows PNP tests

Hello,

In some cases bus driver can deassert "bus master" bit in PCI command
register. The driver will no longer be able to update related registers in
the device. Eventually it will cause QEMU to exit in "virtqueue_num_heads"
function.

Attached path that fixes the described issue.

Best regards,
Yan Vugenfirer.

>From 3fdafbdfad676ec8479dc073cff70bf356868bfe Mon Sep 17 00:00:00 2001
From: Yan Vugenfirer <yvugenfi@redhat.com>
Date: Tue, 8 Sep 2009 10:08:14 -0400
Subject: [PATCH] VirtIO: Fix QEMU crash during Windows PNP tests

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
1 file changed
tree: fde1552e456e1726b6102466440fd95f34c611cf
  1. audio/
  2. block/
  3. bsd-user/
  4. darwin-user/
  5. fpu/
  6. gdb-xml/
  7. hw/
  8. linux-user/
  9. pc-bios/
  10. roms/
  11. slirp/
  12. target-alpha/
  13. target-arm/
  14. target-cris/
  15. target-i386/
  16. target-m68k/
  17. target-microblaze/
  18. target-mips/
  19. target-ppc/
  20. target-sh4/
  21. target-sparc/
  22. tcg/
  23. tests/
  24. .gitignore
  25. .gitmodules
  26. a.out.h
  27. acl.c
  28. acl.h
  29. aes.c
  30. aes.h
  31. aio.c
  32. alpha-dis.c
  33. alpha.ld
  34. arm-dis.c
  35. arm-semi.c
  36. arm.ld
  37. balloon.h
  38. block.c
  39. block.h
  40. block_int.h
  41. bswap.h
  42. bt-host.c
  43. bt-host.h
  44. bt-vhci.c
  45. buffered_file.c
  46. buffered_file.h
  47. cache-utils.c
  48. cache-utils.h
  49. Changelog
  50. check-qdict.c
  51. check-qint.c
  52. check-qstring.c
  53. cmd.c
  54. cmd.h
  55. cocoa.m
  56. CODING_STYLE
  57. configure
  58. console.c
  59. console.h
  60. COPYING
  61. COPYING.LIB
  62. cpu-all.h
  63. cpu-common.h
  64. cpu-defs.h
  65. cpu-exec.c
  66. create_config
  67. cris-dis.c
  68. curses.c
  69. curses_keys.h
  70. cutils.c
  71. d3des.c
  72. d3des.h
  73. def-helper.h
  74. device_tree.c
  75. device_tree.h
  76. dis-asm.h
  77. disas.c
  78. disas.h
  79. dma-helpers.c
  80. dma.h
  81. dyngen-exec.h
  82. elf.h
  83. elf_ops.h
  84. envlist.c
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  86. exec-all.h
  87. exec.c
  88. feature_to_c.sh
  89. gdbstub.c
  90. gdbstub.h
  91. gen-icount.h
  92. host-utils.c
  93. host-utils.h
  94. hostregs_helper.h
  95. hpet.h
  96. hppa-dis.c
  97. hppa.ld
  98. hxtool
  99. i386-dis.c
  100. i386.ld
  101. ia64.ld
  102. ioport-user.c
  103. ioport.c
  104. ioport.h
  105. keymaps.c
  106. keymaps.h
  107. kvm-all.c
  108. kvm.h
  109. libfdt_env.h
  110. LICENSE
  111. linux-aio.c
  112. loader.c
  113. m68k-dis.c
  114. m68k-semi.c
  115. m68k.ld
  116. MAINTAINERS
  117. Makefile
  118. Makefile.hw
  119. Makefile.target
  120. microblaze-dis.c
  121. migration-exec.c
  122. migration-fd.c
  123. migration-tcp.c
  124. migration-unix.c
  125. migration.c
  126. migration.h
  127. mips-dis.c
  128. mips.ld
  129. module.c
  130. module.h
  131. monitor.c
  132. monitor.h
  133. nbd.c
  134. nbd.h
  135. net-checksum.c
  136. net.c
  137. net.h
  138. osdep.c
  139. osdep.h
  140. path.c
  141. pci-ids.txt
  142. posix-aio-compat.c
  143. ppc-dis.c
  144. ppc.ld
  145. ppc64.ld
  146. qdict-test-data.txt
  147. qdict.c
  148. qdict.h
  149. qemu-aio.h
  150. qemu-binfmt-conf.sh
  151. qemu-char.c
  152. qemu-char.h
  153. qemu-common.h
  154. qemu-config.c
  155. qemu-config.h
  156. qemu-doc.texi
  157. qemu-img-cmds.hx
  158. qemu-img.c
  159. qemu-img.texi
  160. qemu-io.c
  161. qemu-lock.h
  162. qemu-log.h
  163. qemu-malloc.c
  164. qemu-monitor.hx
  165. qemu-nbd.c
  166. qemu-nbd.texi
  167. qemu-option.c
  168. qemu-option.h
  169. qemu-options.hx
  170. qemu-sockets.c
  171. qemu-tech.texi
  172. qemu-thread.c
  173. qemu-thread.h
  174. qemu-timer.h
  175. qemu-tool.c
  176. qemu.sasl
  177. qemu_socket.h
  178. qint.c
  179. qint.h
  180. qobject.h
  181. qstring.c
  182. qstring.h
  183. readline.c
  184. readline.h
  185. README
  186. rules.mak
  187. s390-dis.c
  188. s390.ld
  189. savevm.c
  190. sdl.c
  191. sdl_keysym.h
  192. sdl_zoom.c
  193. sdl_zoom.h
  194. sdl_zoom_template.h
  195. sh4-dis.c
  196. softmmu-semi.h
  197. softmmu_defs.h
  198. softmmu_exec.h
  199. softmmu_header.h
  200. softmmu_template.h
  201. sparc-dis.c
  202. sparc.ld
  203. sparc64.ld
  204. sys-queue.h
  205. sysemu.h
  206. tap-win32.c
  207. targphys.h
  208. texi2pod.pl
  209. thunk.c
  210. thunk.h
  211. TODO
  212. translate-all.c
  213. uboot_image.h
  214. usb-bsd.c
  215. usb-linux.c
  216. usb-stub.c
  217. VERSION
  218. vgafont.h
  219. vl.c
  220. vnc-auth-sasl.c
  221. vnc-auth-sasl.h
  222. vnc-auth-vencrypt.c
  223. vnc-auth-vencrypt.h
  224. vnc-tls.c
  225. vnc-tls.h
  226. vnc.c
  227. vnc.h
  228. vnc_keysym.h
  229. vnchextile.h
  230. x86_64.ld
  231. x_keymap.c
  232. x_keymap.h