This small patchset fixes the incorrect behaviour of the vCont command
in the gdb stub. 

The first patch, as suggested be Paolo, refactors some code. The most
visible change is that it moves vm_start to cpus.c 

The second one fixes the incorrect behaviour of the vCont command.
Previously, continuing or stepping a single thread (CPU) caused all
other CPUs to be started too, whereas the GDB specification clearly
states that without a default action all threads not explicitly
mentioned in the command should stay stopped.

So if the Qemu gdbstub receives a  vCont;c:1  packet, no other CPU
should be restarted except the first, and when a  vCont;s:1  is
received, the first CPU should be stepped without restarting the others.
With this patchset Qemu now behaves as expected.

See here for reference material about the packets:

Claudio Imbrenda (2):
  move vm_start to cpus.c
  gdbstub: Fix vCont behaviour

 cpus.c                     |  61 +++++++++++-
 gdbstub.c                  | 226 +++++++++++++++++++++++++++++++++++----------
 hw/i386/kvmvapic.c         |   2 +
 include/sysemu/cpus.h      |   1 +
 include/sysemu/sysemu.h    |   2 +
 target-s390x/misc_helper.c |   2 +
 vl.c                       |  32 +------
 7 files changed, 249 insertions(+), 77 deletions(-)


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