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

[Jarkko Sakkinen]

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