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| /optee_os/core/arch/arm/include/sm/ |
| H A D | optee_smc.h | 27b5e34b47fbd3028586ce81d62ce46c55432667 Mon Feb 18 14:16:11 UTC 2019 Volodymyr Babchuk <vlad.babchuk@gmail.com> core: Introduce OPTEE_SMC_GET_THREAD_COUNT
This call should be used to query OP-TEE about number of threads
(basically, CFG_NUM_THREADS build option).
It is introduced after discussion at [1] about possibility to read
number of supported threads. It is needed for XEN OP-TEE mediator to
mitigate possible DoS from virtual guest. If XEN knows number of
OP-TEE threads, it can limit number of standard calls from the guest
on own side.
Also, it can be used by optee client driver, to ratelimit number of calls
from its side.
Link: [1] https://lists.xenproject.org/archives/html/xen-devel/2019-01/msg01460.html
Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
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| /optee_os/core/arch/arm/tee/ |
| H A D | entry_fast.c | 27b5e34b47fbd3028586ce81d62ce46c55432667 Mon Feb 18 14:16:11 UTC 2019 Volodymyr Babchuk <vlad.babchuk@gmail.com> core: Introduce OPTEE_SMC_GET_THREAD_COUNT
This call should be used to query OP-TEE about number of threads
(basically, CFG_NUM_THREADS build option).
It is introduced after discussion at [1] about possibility to read
number of supported threads. It is needed for XEN OP-TEE mediator to
mitigate possible DoS from virtual guest. If XEN knows number of
OP-TEE threads, it can limit number of standard calls from the guest
on own side.
Also, it can be used by optee client driver, to ratelimit number of calls
from its side.
Link: [1] https://lists.xenproject.org/archives/html/xen-devel/2019-01/msg01460.html
Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
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