linux-kernel - Re: [PATCH v17 07/23] x86/mm: x86/sgx: Add new 'PF

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Message-ID: <20181118083816.GN5897@linux.intel.com>
Date:   Sun, 18 Nov 2018 10:38:16 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        linux-sgx@...r.kernel.org, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, mark.shanahan@...el.com, luto@...capital.net,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v17 07/23] x86/mm: x86/sgx: Add new 'PF_SGX' page fault
 error code bit

On Fri, Nov 16, 2018 at 03:33:35PM -0800, Dave Hansen wrote:
> On 11/15/18 5:01 PM, Jarkko Sakkinen wrote:
> > The SGX bit is set in the #PF error code if and only if the fault is
> > detected by the Enclave Page Cache Map (EPCM), a hardware-managed
> > table that enforces the paging permissions defined by the enclave,
> > e.g. to prevent the kernel from changing the permissions of an
> > enclave's page(s).
> 
> This should probably also mention that, despite being a page fault,
> X86_PF_SGX has nothing to do with paging itself.

A valid point.

/Jarkko