Re: [PATCH v3 02/18] nitro_enclaves: Define the PCI device interface

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On 27/05/2020 01:21, Greg KH wrote:
On Tue, May 26, 2020 at 08:01:36PM +0300, Paraschiv, Andra-Irina wrote:

On 26/05/2020 09:44, Greg KH wrote:
On Tue, May 26, 2020 at 01:13:18AM +0300, Andra Paraschiv wrote:
+struct enclave_get_slot_req {
+	/* Context ID (CID) for the enclave vsock device. */
+	u64 enclave_cid;
+} __attribute__ ((__packed__));
Can you really "pack" a single member structure?

Anyway, we have better ways to specify this instead of the "raw"
__attribute__ option.  But first see if you really need any of these, at
first glance, I do not think you do at all, and they can all be removed.
There are a couple of data structures with more than one member and multiple
field sizes. And for the ones that are not, gathered as feedback from
previous rounds of review that should consider adding a "flags" field in
there for further extensibility.
Please do not do that in ioctls.  Just create new calls instead of
trying to "extend" existing ones.  It's always much easier.

I can modify to have "__packed" instead of the attribute callout.
Make sure you even need that, as I don't think you do for structures
like the above one, right?

For the ones like the above, not, I just customized the usage of "__packed".

Thanks,
Andra



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