migration: consolidate VMStateField.start

The member VMStateField.start is used for two things, partial data
migration for VBUFFER data (basically provide migration for a
sub-buffer) and for locating next in QTAILQ.

The implementation of the VBUFFER feature is broken when VMSTATE_ALLOC
is used. This however goes unnoticed because actually partial migration
for VBUFFER is not used at all.

Let's consolidate the usage of VMStateField.start by removing support
for partial migration for VBUFFER.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>

Message-Id: <20170203175217.45562-1-pasic@linux.vnet.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
15 files changed
tree: a3f0ec57065500119bc1d2f1a3cd195728dcfcb2
  1. audio/
  2. backends/
  3. block/
  4. bsd-user/
  5. chardev/
  6. contrib/
  7. crypto/
  8. default-configs/
  9. disas/
  10. docs/
  11. fpu/
  12. fsdev/
  13. gdb-xml/
  14. hw/
  15. include/
  16. io/
  17. libdecnumber/
  18. linux-headers/
  19. linux-user/
  20. migration/
  21. nbd/
  22. net/
  23. pc-bios/
  24. po/
  25. qapi/
  26. qga/
  27. qobject/
  28. qom/
  29. replay/
  30. roms/
  31. scripts/
  32. slirp/
  33. stubs/
  34. target/
  35. tcg/
  36. tests/
  37. trace/
  38. ui/
  39. util/
  40. .dir-locals.el
  41. .exrc
  42. .gitignore
  43. .gitmodules
  44. .mailmap
  45. .travis.yml
  46. accel.c
  47. aio-posix.c
  48. aio-win32.c
  49. arch_init.c
  50. async.c
  51. atomic_template.h
  52. balloon.c
  53. block.c
  54. blockdev-nbd.c
  55. blockdev.c
  56. blockjob.c
  57. bootdevice.c
  58. bt-host.c
  59. bt-vhci.c
  60. Changelog
  61. CODING_STYLE
  62. configure
  63. COPYING
  64. COPYING.LIB
  65. cpu-exec-common.c
  66. cpu-exec.c
  67. cpus-common.c
  68. cpus.c
  69. cputlb.c
  70. device-hotplug.c
  71. device_tree.c
  72. disas.c
  73. dma-helpers.c
  74. dump.c
  75. exec.c
  76. gdbstub.c
  77. HACKING
  78. hax-stub.c
  79. hmp-commands-info.hx
  80. hmp-commands.hx
  81. hmp.c
  82. hmp.h
  83. iohandler.c
  84. ioport.c
  85. iothread.c
  86. kvm-all.c
  87. kvm-stub.c
  88. LICENSE
  89. main-loop.c
  90. MAINTAINERS
  91. Makefile
  92. Makefile.objs
  93. Makefile.target
  94. memory.c
  95. memory_ldst.inc.c
  96. memory_mapping.c
  97. module-common.c
  98. monitor.c
  99. numa.c
  100. os-posix.c
  101. os-win32.c
  102. page_cache.c
  103. qapi-schema.json
  104. qdev-monitor.c
  105. qdict-test-data.txt
  106. qemu-bridge-helper.c
  107. qemu-doc.texi
  108. qemu-ga.texi
  109. qemu-img-cmds.hx
  110. qemu-img.c
  111. qemu-img.texi
  112. qemu-io-cmds.c
  113. qemu-io.c
  114. qemu-nbd.c
  115. qemu-nbd.texi
  116. qemu-option-trace.texi
  117. qemu-options-wrapper.h
  118. qemu-options.h
  119. qemu-options.hx
  120. qemu-seccomp.c
  121. qemu-tech.texi
  122. qemu-timer.c
  123. qemu.nsi
  124. qemu.sasl
  125. qmp.c
  126. qtest.c
  127. README
  128. replication.c
  129. replication.h
  130. rules.mak
  131. softmmu_template.h
  132. spice-qemu-char.c
  133. tcg-runtime.c
  134. tci.c
  135. thread-pool.c
  136. thunk.c
  137. tpm.c
  138. trace-events
  139. translate-all.c
  140. translate-all.h
  141. translate-common.c
  142. user-exec-stub.c
  143. user-exec.c
  144. VERSION
  145. version.rc
  146. vl.c
  147. xen-common-stub.c
  148. xen-common.c
  149. xen-hvm-stub.c
  150. xen-hvm.c
  151. xen-mapcache.c