gdbstub: Add vCont support
This patch adds support for the vCont remote gdb command. It is used by gdb 6.8 or better to switch the debugging focus for single-stepping multi-threaded targets, ie. multi-threaded application in user mode emulation or VCPUs in system emulation. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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