exec.c: Don't set cpu->as until cpu_address_space_init
Rather than setting cpu->as unconditionally in cpu_exec_init (and then having target-i386 override this later), don't set it until the first call to cpu_address_space_init. This requires us to initialise the address space for both TCG and KVM (KVM doesn't need the AS listener but it does require cpu->as to be set). For target CPUs which don't set up any address spaces (currently everything except i386), add the default address_space_memory in qemu_init_vcpu(). Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>
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