| Message ID | 20190619175333.29938-5-volodymyr_babchuk@epam.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | TEE mediator (and OP-TEE) support in XEN | expand |
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; > } > >
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; }
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> --- xen/arch/arm/tee/optee.c | 10 ++++++++++ 1 file changed, 10 insertions(+)