accel/hvf: Mention hvf_arch_update_guest_debug() must run on vCPU Since hvf_arch_update_guest_debug() calls hvf_arch_set_traps() and hvf_arch_update_guest_debug(), which must run on a vCPU, it also must. Mention it. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Mads Ynddal <mads@ynddal.dk> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>