Re: [PATCH v6 04/10] optee: sync secure world ABI headers

Sumit Garg
2025-03-25T06:20:39Z

Hi Jens,

It has taken a bit of time for me to review this patch-set as I am
settling in my new role.

On Wed, Mar 05, 2025 at 02:04:10PM +0100, Jens Wiklander wrote:
> Update the header files describing the secure world ABI, both with and
> without FF-A. The ABI is extended to deal with restricted memory, but as
> usual backward compatible.
>
> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
> ---
> drivers/tee/optee/optee_ffa.h | 27 ++++++++++---
> drivers/tee/optee/optee_msg.h | 65 ++++++++++++++++++++++++++++++--
> drivers/tee/optee/optee_smc.h | 71 ++++++++++++++++++++++++++++++++++-
> 3 files changed, 154 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h
> index 257735ae5b56..7bd037200343 100644
> --- a/drivers/tee/optee/optee_ffa.h
> +++ b/drivers/tee/optee/optee_ffa.h
> @@ -81,7 +81,7 @@
> * as the second MSG arg struct for
> * OPTEE_FFA_YIELDING_CALL_WITH_ARG.
> * Bit[31:8]: Reserved (MBZ)
> - * w5: Bitfield of secure world capabilities OPTEE_FFA_SEC_CAP_* below,
> + * w5: Bitfield of OP-TEE capabilities OPTEE_FFA_SEC_CAP_*
> * w6: The maximum secure world notification number
> * w7: Not used (MBZ)
> */
> @@ -94,6 +94,8 @@
> #define OPTEE_FFA_SEC_CAP_ASYNC_NOTIF BIT(1)
> /* OP-TEE supports probing for RPMB device if needed */
> #define OPTEE_FFA_SEC_CAP_RPMB_PROBE BIT(2)
> +/* OP-TEE supports Restricted Memory for secure data path */
> +#define OPTEE_FFA_SEC_CAP_RSTMEM BIT(3)
>
> #define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
>
> @@ -108,7 +110,7 @@
> *
> * Return register usage:
> * w3: Error code, 0 on success
> - * w4-w7: Note used (MBZ)
> + * w4-w7: Not used (MBZ)
> */
> #define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3)
>
> @@ -119,16 +121,31 @@
> * Call register usage:
> * w3: Service ID, OPTEE_FFA_ENABLE_ASYNC_NOTIF
> * w4: Notification value to request bottom half processing, should be
> - * less than OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE.
> + * less than OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE
> * w5-w7: Not used (MBZ)
> *
> * Return register usage:
> * w3: Error code, 0 on success
> - * w4-w7: Note used (MBZ)
> + * w4-w7: Not used (MBZ)
> */
> #define OPTEE_FFA_ENABLE_ASYNC_NOTIF OPTEE_FFA_BLOCKING_CALL(5)
>
> -#define OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE 64
> +#define OPTEE_FFA_MAX_ASYNC_NOTIF_VALUE 64
> +
> +/*
> + * Release Restricted memory
> + *
> + * Call register usage:
> + * w3: Service ID, OPTEE_FFA_RECLAIM_RSTMEM
> + * w4: Shared memory handle, lower bits
> + * w5: Shared memory handle, higher bits
> + * w6-w7: Not used (MBZ)
> + *
> + * Return register usage:
> + * w3: Error code, 0 on success
> + * w4-w7: Note used (MBZ)
> + */
> +#define OPTEE_FFA_RELEASE_RSTMEM OPTEE_FFA_BLOCKING_CALL(8)
>
> /*
> * Call with struct optee_msg_arg as argument in the supplied shared memory
> diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h
> index e8840a82b983..1b558526e7d9 100644
> --- a/drivers/tee/optee/optee_msg.h
> +++ b/drivers/tee/optee/optee_msg.h
> @@ -133,13 +133,13 @@ struct optee_msg_param_rmem {
> };
>
> /**
> - * struct optee_msg_param_fmem - ffa memory reference parameter
> + * struct optee_msg_param_fmem - FF-A memory reference parameter
> * @offs_lower: Lower bits of offset into shared memory reference
> * @offs_upper: Upper bits of offset into shared memory reference
> * @internal_offs: Internal offset into the first page of shared memory
> * reference
> * @size: Size of the buffer
> - * @global_id: Global identifier of Shared memory
> + * @global_id: Global identifier of the shared memory
> */
> struct optee_msg_param_fmem {
> u32 offs_low;
> @@ -165,7 +165,7 @@ struct optee_msg_param_value {
> * @attr: attributes
> * @tmem: parameter by temporary memory reference
> * @rmem: parameter by registered memory reference
> - * @fmem: parameter by ffa registered memory reference
> + * @fmem: parameter by FF-A registered memory reference
> * @value: parameter by opaque value
> * @octets: parameter by octet string
> *
> @@ -296,6 +296,18 @@ struct optee_msg_arg {
> */
> #define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001
>
> +/*
> + * Values used in OPTEE_MSG_CMD_LEND_RSTMEM below
> + * OPTEE_MSG_RSTMEM_RESERVED Reserved
> + * OPTEE_MSG_RSTMEM_SECURE_VIDEO_PLAY Secure Video Playback
> + * OPTEE_MSG_RSTMEM_TRUSTED_UI Trused UI
> + * OPTEE_MSG_RSTMEM_SECURE_VIDEO_RECORD Secure Video Recording
> + */
> +#define OPTEE_MSG_RSTMEM_RESERVED 0
> +#define OPTEE_MSG_RSTMEM_SECURE_VIDEO_PLAY 1
> +#define OPTEE_MSG_RSTMEM_TRUSTED_UI 2
> +#define OPTEE_MSG_RSTMEM_SECURE_VIDEO_RECORD 3
> +
> /*
> * Do a secure call with struct optee_msg_arg as argument
> * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd
> @@ -337,6 +349,49 @@ struct optee_msg_arg {
> * OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is
> * normal world unable to process asynchronous notifications. Typically
> * used when the driver is shut down.
> + *
> + * OPTEE_MSG_CMD_LEND_RSTMEM lends restricted memory. The passed normal
> + * physical memory is restricted from normal world access. The memory
> + * should be unmapped prior to this call since it becomes inaccessible
> + * during the request.
> + * Parameters are passed as:
> + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT
> + * [in] param[0].u.value.a OPTEE_MSG_RSTMEM_* defined above
> + * [in] param[1].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT
> + * [in] param[1].u.tmem.buf_ptr physical address
> + * [in] param[1].u.tmem.size size
> + * [in] param[1].u.tmem.shm_ref holds restricted memory reference
> + *
> + * OPTEE_MSG_CMD_RECLAIM_RSTMEM reclaims a previously lent restricted
> + * memory reference. The physical memory is accessible by the normal world
> + * after this function has return and can be mapped again. The information
> + * is passed as:
> + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT
> + * [in] param[0].u.value.a holds restricted memory cookie
> + *
> + * OPTEE_MSG_CMD_GET_RSTMEM_CONFIG get configuration for a specific
> + * restricted memory use case. Parameters are passed as:
> + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INOUT
> + * [in] param[0].value.a OPTEE_MSG_RSTMEM_*
> + * [in] param[1].attr OPTEE_MSG_ATTR_TYPE_{R,F}MEM_OUTPUT
> + * [in] param[1].u.{r,f}mem Buffer or NULL
> + * [in] param[1].u.{r,f}mem.size Provided size of buffer or 0 for query
> + * output for the restricted use case:
> + * [out] param[0].value.a Minimal size of SDP memory
> + * [out] param[0].value.b Required alignment of size and start of
> + * restricted memory
> + * [out] param[1].{r,f}mem.size Size of output data
> + * [out] param[1].{r,f}mem If non-NULL, contains an array of
> + * uint16_t holding endpoints that
> + * must be included when lending
> + * memory for this use case
> + *
> + * OPTEE_MSG_CMD_ASSIGN_RSTMEM assigns use-case to restricted memory
> + * previously lent using the FFA_LEND framework ABI. Parameters are passed
> + * as:
> + * [in] param[0].attr OPTEE_MSG_ATTR_TYPE_VALUE_INPUT
> + * [in] param[0].u.value.a holds restricted memory cookie
> + * [in] param[0].u.value.b OPTEE_MSG_RSTMEM_* defined above
> */
> #define OPTEE_MSG_CMD_OPEN_SESSION 0
> #define OPTEE_MSG_CMD_INVOKE_COMMAND 1
> @@ -346,6 +401,10 @@ struct optee_msg_arg {
> #define OPTEE_MSG_CMD_UNREGISTER_SHM 5
> #define OPTEE_MSG_CMD_DO_BOTTOM_HALF 6
> #define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7
> +#define OPTEE_MSG_CMD_LEND_RSTMEM 8
> +#define OPTEE_MSG_CMD_RECLAIM_RSTMEM 9
> +#define OPTEE_MSG_CMD_GET_RSTMEM_CONFIG 10
> +#define OPTEE_MSG_CMD_ASSIGN_RSTMEM 11
> #define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004
>
> #endif /* _OPTEE_MSG_H */
> diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h
> index 879426300821..abc379ce190c 100644
> --- a/drivers/tee/optee/optee_smc.h
> +++ b/drivers/tee/optee/optee_smc.h
> @@ -264,7 +264,6 @@ struct optee_smc_get_shm_config_result {
> #define OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM BIT(0)
> /* Secure world can communicate via previously unregistered shared memory */
> #define OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM BIT(1)
> -
> /*
> * Secure world supports commands "register/unregister shared memory",
> * secure world accepts command buffers located in any parts of non-secure RAM
> @@ -280,6 +279,10 @@ struct optee_smc_get_shm_config_result {
> #define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6)
> /* Secure world supports probing for RPMB device if needed */
> #define OPTEE_SMC_SEC_CAP_RPMB_PROBE BIT(7)
> +/* Secure world supports Secure Data Path */
> +#define OPTEE_SMC_SEC_CAP_SDP BIT(8)
> +/* Secure world supports dynamic restricted memory */
> +#define OPTEE_SMC_SEC_CAP_DYNAMIC_RSTMEM BIT(9)
>
> #define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
> #define OPTEE_SMC_EXCHANGE_CAPABILITIES \
> @@ -451,6 +454,72 @@ struct optee_smc_disable_shm_cache_result {
>
> /* See OPTEE_SMC_CALL_WITH_REGD_ARG above */
> #define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19
> +/*
> + * Get Secure Data Path memory config
> + *
> + * Returns the Secure Data Path memory config.
> + *
> + * Call register usage:
> + * a0 SMC Function ID, OPTEE_SMC_GET_SDP_CONFIG
> + * a2-6 Not used, must be zero
> + * a7 Hypervisor Client ID register
> + *
> + * Have config return register usage:
> + * a0 OPTEE_SMC_RETURN_OK
> + * a1 Physical address of start of SDP memory
> + * a2 Size of SDP memory
> + * a3 Not used
> + * a4-7 Preserved
> + *
> + * Not available register usage:
> + * a0 OPTEE_SMC_RETURN_ENOTAVAIL
> + * a1-3 Not used
> + * a4-7 Preserved
> + */
> +#define OPTEE_SMC_FUNCID_GET_SDP_CONFIG 20

Let's have a consistent ABI naming here. I think RSTMEM is more generic
rather than SDP, so let's use same naming convention as we use for FF-A
ABI.

-Sumit

> +#define OPTEE_SMC_GET_SDP_CONFIG \
> + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SDP_CONFIG)
> +
> +struct optee_smc_get_sdp_config_result {
> + unsigned long status;
> + unsigned long start;
> + unsigned long size;
> + unsigned long flags;
> +};
> +
> +/*
> + * Get Secure Data Path dynamic memory config
> + *
> + * Returns the Secure Data Path dynamic memory config.
> + *
> + * Call register usage:
> + * a0 SMC Function ID, OPTEE_SMC_GET_DYN_SHM_CONFIG
> + * a2-6 Not used, must be zero
> + * a7 Hypervisor Client ID register
> + *
> + * Have config return register usage:
> + * a0 OPTEE_SMC_RETURN_OK
> + * a1 Minamal size of SDP memory
> + * a2 Required alignment of size and start of registered SDP memory
> + * a3 Not used
> + * a4-7 Preserved
> + *
> + * Not available register usage:
> + * a0 OPTEE_SMC_RETURN_ENOTAVAIL
> + * a1-3 Not used
> + * a4-7 Preserved
> + */
> +
> +#define OPTEE_SMC_FUNCID_GET_DYN_SDP_CONFIG 21
> +#define OPTEE_SMC_GET_DYN_SDP_CONFIG \
> + OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_DYN_SDP_CONFIG)
> +
> +struct optee_smc_get_dyn_sdp_config_result {
> + unsigned long status;
> + unsigned long size;
> + unsigned long align;
> + unsigned long flags;
> +};
>
> /*
> * Resume from RPC (for example after processing a foreign interrupt)
> --
> 2.43.0
>