Re: [PATCH v2 07/12] optee: use driver internal tee_contex for some rpc

On Fri, 21 Jan 2022 at 18:58, Jerome Forissier jerome@forissier.org wrote:

On 1/21/22 13:54, Sumit Garg wrote:

...

• Jerome, Etienne

On Fri, 14 Jan 2022 at 20:38, Jens Wiklander jens.wiklander@linaro.org wrote:

...

Uses the new driver internal tee_context when allocating driver private shared memory. This decouples the shared memory object from its original tee_context. This is needed when the life time of such a memory allocation outlives the client tee_context.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org

drivers/tee/optee/ffa_abi.c | 16 ++++++++-------- drivers/tee/optee/smc_abi.c | 7 ++++--- 2 files changed, 12 insertions(+), 11 deletions(-)

I guess with this patch we should no longer see issues [1] reported earlier.

Correct. I have tested [1] again in QEMU with this whole series applied and the issue is gone.

Thanks for the confirmation.

Jens,

Can we have a Fixes tag for this and CC stable? I know it won't be directly applicable to stable kernels but we can help with a backport.

-Sumit

-- Jerome

...

FWIW,

Reviewed-by: Sumit Garg sumit.garg@linaro.org

[1] https://github.com/OP-TEE/optee_os/issues/1918

-Sumit

...

diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c index 88a028d4fb7b..5ec484b42432 100644 --- a/drivers/tee/optee/ffa_abi.c +++ b/drivers/tee/optee/ffa_abi.c @@ -424,6 +424,7 @@ static struct tee_shm_pool *optee_ffa_shm_pool_alloc_pages(void) */

static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,

•                                         struct optee *optee,
                                          struct optee_msg_arg *arg)
  

{ struct tee_shm *shm; @@ -439,7 +440,7 @@ static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx, shm = optee_rpc_cmd_alloc_suppl(ctx, arg->params[0].u.value.b); break; case OPTEE_RPC_SHM_TYPE_KERNEL:

•           shm = tee_shm_alloc_priv_kernel_buf(ctx,
  

•           shm = tee_shm_alloc_priv_kernel_buf(optee->ctx,
                                                arg->params[0].u.value.b);
            break;
    default:
  

@@ -493,14 +494,13 @@ static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx, }

static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,

•                               struct optee *optee,
                                struct optee_msg_arg *arg)
  

{

•   struct optee *optee = tee_get_drvdata(ctx->teedev);
  

•   arg->ret_origin = TEEC_ORIGIN_COMMS;
    switch (arg->cmd) {
    case OPTEE_RPC_CMD_SHM_ALLOC:
  

•           handle_ffa_rpc_func_cmd_shm_alloc(ctx, arg);
  

•           handle_ffa_rpc_func_cmd_shm_alloc(ctx, optee, arg);
            break;
    case OPTEE_RPC_CMD_SHM_FREE:
            handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg);
  

@@ -510,12 +510,12 @@ static void handle_ffa_rpc_func_cmd(struct tee_context *ctx, } }

-static void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,

•                            struct optee_msg_arg *arg)
  

+static void optee_handle_ffa_rpc(struct tee_context *ctx, struct optee *optee,

•                            u32 cmd, struct optee_msg_arg *arg)
  

{ switch (cmd) { case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD:

•           handle_ffa_rpc_func_cmd(ctx, arg);
  

•           handle_ffa_rpc_func_cmd(ctx, optee, arg);
            break;
    case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT:
            /* Interrupt delivered by now */
  

@@ -582,7 +582,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx, * above. */ cond_resched();

•           optee_handle_ffa_rpc(ctx, data->data1, rpc_arg);
  

•           optee_handle_ffa_rpc(ctx, optee, data->data1, rpc_arg);
            cmd = OPTEE_FFA_YIELDING_CALL_RESUME;
            data->data0 = cmd;
            data->data1 = 0;
  

diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c index 1dbb13b08381..f2ef76451443 100644 --- a/drivers/tee/optee/smc_abi.c +++ b/drivers/tee/optee/smc_abi.c @@ -621,6 +621,7 @@ static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx, }

static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,

•                                     struct optee *optee,
                                      struct optee_msg_arg *arg,
                                      struct optee_call_ctx *call_ctx)
  

{ @@ -650,7 +651,7 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx, shm = optee_rpc_cmd_alloc_suppl(ctx, sz); break; case OPTEE_RPC_SHM_TYPE_KERNEL:

•           shm = tee_shm_alloc_priv_kernel_buf(ctx, sz);
  

•           shm = tee_shm_alloc_priv_kernel_buf(optee->ctx, sz);
            break;
    default:
            arg->ret = TEEC_ERROR_BAD_PARAMETERS;
  

@@ -746,7 +747,7 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee, switch (arg->cmd) { case OPTEE_RPC_CMD_SHM_ALLOC: free_pages_list(call_ctx);

•           handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
  

•           handle_rpc_func_cmd_shm_alloc(ctx, optee, arg, call_ctx);
            break;
    case OPTEE_RPC_CMD_SHM_FREE:
            handle_rpc_func_cmd_shm_free(ctx, arg);
  

@@ -775,7 +776,7 @@ static void optee_handle_rpc(struct tee_context *ctx,

    switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
    case OPTEE_SMC_RPC_FUNC_ALLOC:

•           shm = tee_shm_alloc_priv_kernel_buf(ctx, param->a1);
  

•           shm = tee_shm_alloc_priv_kernel_buf(optee->ctx, param->a1);
            if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
                    reg_pair_from_64(&param->a1, &param->a2, pa);
                    reg_pair_from_64(&param->a4, &param->a5,
  

-- 2.31.1