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_babc...@epam.com>
Acked-by: Julien Grall <julien.gr...@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;
}
--
Julien Grall
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