An apparatus comprising: a memory ; a hardware buffer ; and a processor configured to: convert guest code to native code; store converted guest code into a code cache of the processor ; maintain the hardware buffer configured for tracking respective locations of converted code in the code cache , wherein the hardware buffer is updated based on a respective access to a respective location in the memory associated with a respective location of converted code in the code cache ; and perform a request to modify the respective location in the memory after updating the hardware buffer , wherein the memory comprises a table associated with the hardware buffer for tracking converted code present in the code cache including one or more of tracking modifications to guest code, tracking a type of exception to take in response to modifications to guest code, and tracking whether the guest code has been converted to native code ; wherein updating the hardware buffer includes determining if the hardware buffer includes an entry corresponding to the respective location in the memory , wherein, if the entry does not exist in the hardware buffer , a determination is made if the entry exists in the table , and wherein, if the entry does not exist in the table , the entry is created in the hardware buffer , and is updated to indicate that the respective location was not converted and not modified. a memory ; a hardware buffer ; and a processor configured to: convert guest code to native code; store converted guest code into a code cache of the processor ; maintain the hardware buffer configured for tracking respective locations of converted code in the code cache , wherein the hardware buffer is updated based on a respective access to a respective location in the memory associated with a respective location of converted code in the code cache ; and perform a request to modify the respective location in the memory after updating the hardware buffer , wherein the memory comprises a table associated with the hardware buffer for tracking converted code present in the code cache including one or more of tracking modifications to guest code, tracking a type of exception to take in response to modifications to guest code, and tracking whether the guest code has been converted to native code ; convert guest code to native code; store converted guest code into a code cache of the processor ; maintain the hardware buffer configured for tracking respective locations of converted code in the code cache , wherein the hardware buffer is updated based on a respective access to a respective location in the memory associated with a respective location of converted code in the code cache ; and perform a request to modify the respective location in the memory after updating the hardware buffer , wherein the memory comprises a table associated with the hardware buffer for tracking converted code present in the code cache including one or more of tracking modifications to guest code, tracking a type of exception to take in response to modifications to guest code, and tracking whether the guest code has been converted to native code ; wherein updating the hardware buffer includes determining if the hardware buffer includes an entry corresponding to the respective location in the memory , wherein, if the entry does not exist in the hardware buffer , a determination is made if the entry exists in the table , and wherein, if the entry does not exist in the table , the entry is created in the hardware buffer , and is updated to indicate that the respective location was not converted and not modified. <EOS>