Hi Chenxu,
On 2021-09-25 07:45, Chenxu Wang wrote:
Hi all,
I want the Guest OS to use the Arm-TF service in Host OS (It is the
same as using Trusted Application in OP-TEE). So I should provide some
parameters and call SMC instruction.
It is unlikely to work out of the box. For a start, the guest is a
different entity altogether, and it is unlikely that ATF can directly
deal with a request coming from the guest, specially if you are passing
any sort of memory reference.
But it returns an "Undefined Instruction" in my Linux v4.9.51.
I find that KVM calls a " kvm_inject_undefined(vcpu);" when handling
the SMC instruction.
You should really get rid of this kernel and move to something more
recent. This UNDEF injection is a bug which has been fixed in more
recent versions of the kernel (by returning -1 instead).
So, if I want the Guest OS to use the "Arm-TF service" or "TA", should
I simply change the kvm_inject_undefined() as "SMC #0", and carefully
handle the input parameters? What else should I do?
You should probably consider relaying the SMC to userspace, and then get
the VMM to do the talking with with the platform TEE driver.
M.
--
Who you jivin' with that Cosmik Debris?
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