Hi Volodymyr,
On 6/19/19 6:54 PM, Volodymyr Babchuk wrote:
This is workaround for OP-TEE 3.5. This is the first OP-TEE release which supports virtualization, but there is no way to tell if OP-TEE was built with that support enabled. We can probe for it by calling SMC that is available only when OP-TEE is built with virtualization support.
Signed-off-by: Volodymyr Babchuk volodymyr_babchuk@epam.com
Acked-by: Julien Grall julien.grall@arm.com
Cheers,
xen/arch/arm/tee/optee.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c index 28d34360fc..14381d6b2d 100644 --- a/xen/arch/arm/tee/optee.c +++ b/xen/arch/arm/tee/optee.c @@ -172,6 +172,16 @@ static bool optee_probe(void) return false; }
- /*
* Workaround: OP-TEE 3.5 have no way to tell if it is build with
* virtualization support. But we can probe for OPTEE_SMC_VM_DESTROYED
* call. It will return OPTEE_SMC_RETURN_UNKNOWN_FUNCTION if
* OP-TEE have no virtualization support enabled.
*/
- arm_smccc_smc(OPTEE_SMC_VM_DESTROYED, 0, 0, 0, 0, 0, 0, 0, &resp);
- if ( resp.a0 == OPTEE_SMC_RETURN_UNKNOWN_FUNCTION )
return false;
}return true;