# Re: \[PATCH v2 03/11\] arm64: gunyah: Add Gunyah hypercalls ABI

- From: Dmitry Baryshkov \<hidden\>
- Date: 2022-08-02 13:34:58 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2022/08/8208323
- Thread: https://ratatoskr.run/linux-arm-kernel/2022/08/8208280/t.md

```text
On 02/08/2022 00:12, Elliot Berman wrote:
> Add initial support to perform Gunyah hypercalls. The arm64 ABI for
> Gunyah hypercalls generally follows the SMC Calling Convention.

Seeing a c&p (or c&rework) from arm-smccc.h, could you please describe:

1) Why can't you use the existing arm_smccc_1_1_hvc()? I checked, you don't seem to be getting more than 4 values back.

2) If #1 is not possible, why can't you add necessary glue code to the arm-smccc.h (as your code to support nargs/multiple return values is generic enough) and use corresponding macro in asm/gunyah.h ?

-- 
With best wishes
Dmitry
```