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

thanks,

greg k-h

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