Messages in this thread | | | Subject | Re: [PATCH v3 07/18] nitro_enclaves: Init misc device providing the ioctl interface | From | Alexander Graf <> | Date | Tue, 9 Jun 2020 12:47:27 +0200 |
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On 01.06.20 05:04, Benjamin Herrenschmidt wrote: > > > On Thu, 2020-05-28 at 15:12 +0200, Greg KH wrote: >> So at runtime, after all is booted and up and going, you just ripped >> cores out from under someone's feet? :) >> >> And the code really handles writing to that value while the module is >> already loaded and up and running? At a quick glance, it didn't seem >> like it would handle that very well as it only is checked at ne_init() >> time. >> >> Or am I missing something? >> >> Anyway, yes, if you can dynamically do this at runtime, that's great, >> but it feels ackward to me to rely on one configuration thing as a >> module parameter, and everything else through the ioctl interface. >> Unification would seem to be a good thing, right? > > I personally still prefer a sysfs file :) I really don't like module > parameters as a way to do such things.
I think we're going in circles :).
A module parameter initialized with module_param_cb gives us a sysfs file that can also have a default parameter set through easily available tooling.
The ioctl has two downsides:
1) It relies on an external application 2) The permission check would be strictly limited to CAP_ADMIN, sysfs files can have different permissions
So I fail to see how a module parameter is *not* giving both of you and me what we want? Of course only if it implements the callback. It was missing that and apologize for that oversight.
Alex
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