Abstract: Mitigating or managing an effect known as “rowhammer” upon a DRAM device may include a memory controller receiving an activation count threshold value from the DRAM device. The memory controller may detect row activation commands directed to the DRAM device and count the number of the row activation commands. The memory controller may send a mitigative refresh command to the DRAM device based on the result of comparing the counted number of row activation commands with the received activation count threshold value.

Abstract: An effect known as “rowhammer” may be mitigated in a DRAM organized in sub-banks of two or more rows. Row activation commands directed to a sub-bank may be detected. The number of row activation commands occurring within a refresh window may be counted and compared with a threshold. When it is detected that the number of row activation commands within the refresh window exceeds the threshold, an additional refresh command may be provided to the DRAM.

Abstract: The present disclosure generally relates to techniques for defending against row hammer attacks. Some aspects of the present disclosure include systems and techniques for defending against row hammer attacks using dynamic assignment of guard rows. One example computing device for memory protection generally includes at least one memory and one or more processors coupled to the at least one memory and configured to: receive a first memory assignment for a service; determine, in response to receiving the first memory assignment, that the service is associated with a type of data; assign guard rows adjacent to a memory subset to protect the memory subset based on the determination; and dedicate at least a portion of the memory subset for storage of data for the service.

Abstract: A DRAM memory controller is provided that identifies a marker command directed to a given row in a DRAM. If a threshold probability is satisfied in response to an identification of the marker command, the DRAM memory controller commands the DRAM to refresh a neighboring row in the DRAM. The neighboring row may be a neighboring of the given row or of a recently-closed row.