Re: [RFC PATCH v3 08/27] x86/sgx: Initialize virtual EPC driver even when SGX driver is disabled

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On 1/31/21 9:40 PM, Kai Huang wrote:
>>> -	ret = sgx_drv_init();
>>> +	/* Success if the native *or* virtual EPC driver initialized cleanly. */
>>> +	ret = !!sgx_drv_init() & !!sgx_vepc_init();
>> If would create more dumb code and just add
>>
>> ret = sgx_vepc_init()
>> if (ret)
>>         goto err_kthread;

Jarkko, I'm not sure I understand this suggestion.

> Do you mean you want below?
> 
> 	ret = sgx_drv_init();
> 	ret = sgx_vepc_init();
> 	if (ret)
> 		goto err_kthread;
> 
> This was Sean's original code, but Dave didn't like it.

Are you sure?  I remember the !!&!! abomination being Sean's doing. :)

> Sean/Dave,
> 
> Please let me know which way you prefer.

Kai, I don't really know you are saying here.  In the end,
sgx_vepc_init() has to run regardless of whether sgx_drv_init() is
successful or not.  Also, we only want to 'goto err_kthraed' if *BOTH*
fail.  The code you have above will, for instance, 'goto err_kthread' if
sgx_drv_init() succeeds but sgx_vepc_init() fails.  It entirely
disregards the sgx_drv_init() error code.




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