riscv: pmp: Add support for unlocked global PMP entries #99520
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This was referenced Nov 17, 2025
jimmyzhe
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Adds the Kconfig option PMP_NO_LOCK to remove the PMP Lock bit usage. The global entry is an internal detail of the driver implementation and should not be reflected in the user interface. This allows the application to dynamically reconfigure the PMP entries without requiring hard reset. This is essential for firmware that performs an RO-to-RW jump. By keeping these system entries unlocked, higher-privileged M-mode code can dynamically reconfigure memory permissions during the secure handover process, which is not possible if the entries are permanently locked during early boot. Signed-off-by: Firas Sammoura <[email protected]>
Adds four new test cases to validate the PMP stack guard protection when `CONFIG_PMP_NO_LOCK` is enabled (i.e., when PMP entries are not globally locked). Signed-off-by: Firas Sammoura <[email protected]>
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Adds the Kconfig option
PMP_NO_LOCKto remove the PMP Lock bit usage. The global entry is an internal detail of the driver implementation and should not be reflected in the user interface. This allows the application to dynamically reconfigure the PMP entries without requiring hard reset. This is essential for firmware that performs an RO-to-RW jump. By keeping these system entries unlocked, higher-privileged M-mode code can dynamically reconfigure memory permissions during the secure handover process, which is not possible if the entries are permanently locked during early boot.Adds four new test cases to validate the PMP stack guard protection when
CONFIG_PMP_NO_LOCKis enabled (i.e., when PMP entries are not globally locked).