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did you mean 'pv_get_reg'? [-Werror=implicit-function-declaration] *val = hvm_get_reg(v, msr); ^~~~~~~~~~~ pv_get_reg msr.c:431:16: error: nested extern declaration of 'hvm_get_reg' [-Werror=nested-externs] msr.c: In function 'guest_wrmsr': msr.c:675:9: error: implicit declaration of function 'hvm_set_reg'; did you mean 'pv_set_reg'? [-Werror=implicit-function-declaration] hvm_set_reg(v, msr, val); ^~~~~~~~~~~ pv_set_reg msr.c:675:9: error: nested extern declaration of 'hvm_set_reg' [-Werror=nested-externs] cc1: all warnings being treated as errors Jan