linux-kernel - Re: x86/sgx: uapi change proposal

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Date:   Thu, 20 Dec 2018 12:30:17 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Jethro Beekman <jethro@...tanix.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "x86@...nel.org" <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Josh Triplett <josh@...htriplett.org>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        "Dr . Greg Wettstein" <greg@...ellic.com>
Subject: Re: x86/sgx: uapi change proposal

On Wed, Dec 19, 2018 at 06:45:15AM -0800, Sean Christopherson wrote:
> I agree with Jethro, passing the enclave_fd as a param is obnoxious.
> And it means the user needs to open /dev/sgx to do anything with an
> enclave fd, e.g. the enclave fd might be passed to a builder thread,

Please note that this is not really a thing that I care that much in the
end of the day because either approach is straight forward to implement.
That is why asked from Jethro, which is more superfluous.

> Take a look at virt/kvm/kvm_main.c to see how KVM manages anon inodes
> and ioctls for VMs and vCPUs.

I actually grabbed anon inode code from in-kernel LE code and started to
transform it to this framework just because I was familiar with that
snippet (because I wrote it) but yeah the idea is similar as in there.

/Jarkko