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| author | Olivier Deprez <olivier.deprez@arm.com> | 2021-11-17 13:54:04 +0100 |
|---|---|---|
| committer | TrustedFirmware Code Review <review@review.trustedfirmware.org> | 2021-11-17 13:54:04 +0100 |
| commit | 095342d3e4fc99213586d784ac485336f9004389 (patch) | |
| tree | 1f0acc3cd5b754b1b8d93958ed161fee5ebc027b | |
| parent | d5c70fa9f998af0815cdeb9e6a42682f210bbdd4 (diff) | |
| parent | aeea04d44d5b8be8843adb31b54529139b4b20a9 (diff) | |
| download | arm-trusted-firmware-095342d3e4fc99213586d784ac485336f9004389.tar.gz | |
Merge "docs(spm): document s-el0 partition support" into integration
| -rw-r--r-- | docs/components/secure-partition-manager.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/docs/components/secure-partition-manager.rst b/docs/components/secure-partition-manager.rst index 057226181..68bb6f2fd 100644 --- a/docs/components/secure-partition-manager.rst +++ b/docs/components/secure-partition-manager.rst @@ -1063,6 +1063,36 @@ streams. Fault handling, Performance Monitor Extensions, Event Handling, MPAM. - No support for independent peripheral devices. +S-EL0 Partition support +========================= +The SPMC (Hafnium) has limited capability to run S-EL0 FF-A partitions using +FEAT_VHE (mandatory with ARMv8.1 in non-secure state, and in secure world +with ARMv8.4 and FEAT_SEL2). + +S-EL0 partitions are useful for simple partitions that don't require full +Trusted OS functionality. It is also useful to reduce jitter and cycle +stealing from normal world since they are more lightweight than VMs. + +S-EL0 partitions are presented, loaded and initialized the same as S-EL1 VMs by +the SPMC. They are differentiated primarily by the 'exception-level' property +and the 'execution-ctx-count' property in the SP manifest. They are host apps +under the single EL2&0 Stage-1 translation regime controlled by the SPMC and +call into the SPMC through SVCs as opposed to HVCs and SMCs. These partitions +can use FF-A defined services (FFA_MEM_PERM_*) to update or change permissions +for memory regions. + +S-EL0 partitions are required by the FF-A specification to be UP endpoints, +capable of migrating, and the SPMC enforces this requirement. The SPMC allows +a S-EL0 partition to accept a direct message from secure world and normal world, +and generate direct responses to them. + +Memory sharing between and with S-EL0 partitions is supported. +Indirect messaging, Interrupt handling and Notifications are not supported with +S-EL0 partitions and is work in progress, planned for future releases. +All S-EL0 partitions must use AArch64. AArch32 S-EL0 partitions are not +supported. + + References ========== |