linux-kernel - Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

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Message-ID: <20181218132711.GD25667@linux.intel.com>
Date:   Tue, 18 Dec 2018 15:27:11 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Dave Hansen <dave.hansen@...el.com>, X86 ML <x86@...nel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-sgx@...r.kernel.org, nhorman@...hat.com,
        npmccallum@...hat.com, "Ayoun, Serge" <serge.ayoun@...el.com>,
        shay.katz-zamir@...el.com,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Svahn, Kai" <kai.svahn@...el.com>, mark.shanahan@...el.com,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

On Mon, Dec 17, 2018 at 09:02:03PM -0800, Andy Lutomirski wrote:
> That's what unmap_mapping_range(), etc do for you, no?  IOW make a
> struct address_space that represents the logical enclave address
> space, i.e. address 0 is the start and the pages count up from there.
> You can unmap pages whenever you want, and the core mm code will take
> care of zapping the pages from all vmas referencing that
> address_space.

OK, so it does. Did not have time to look at it last night (about
3AM) :-) Yes, we could use that to do the N process zapping.

Based on this discussion I can take the first steps with the swapping
code.

And yeah, I don't think we need anon inode for this one. Can just use
the dev inode (did not check in detail but on the surface looks like
it).

/Jarkko