Re: [PATCH v38 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call

[Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>]

On Tue, Sep 15, 2020 at 02:05:19PM +0300, Jarkko Sakkinen wrote:
> +struct sgx_enclave_run {
> +	__u64 tcs;
> +	__u32 flags;
> +	__u32 exit_reason;
> +
> +	union {
> +		sgx_enclave_exit_handler_t user_handler;
> +		__u64 __user_handler;
> +	};

I will replace this with just:

	__u64 user_handler;

> +	__u64 user_data;
> +
> +	union {
> +		struct sgx_enclave_exception exception;
> +
> +		/* Pad the entire struct to 256 bytes. */
> +		__u8 pad[256 - 32];
> +	};
> +};

Resulting:


struct sgx_enclave_run {
	__u64 tcs;
	__u32 flags;
	__u32 exit_reason;
	__u64 user_handler;
	__u64 user_data;

	union {
		struct sgx_enclave_exception exception;

		/* Pad the entire struct to 256 bytes. */
		__u8 pad[256 - 32];
	};
};

BTW, why there is that padding?

/Jarkko