linux-kernel - Re: [PATCH v14 09/19] x86/mm: x86/sgx: Signal SEGV_SGXERR for #PFs w/ PF

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Message-ID: <CALCETrVAhiwv+g5fzVO3ZSHZgcQKbeeG8r3HUcXO9k7Gi94NdQ@mail.gmail.com>
Date:   Tue, 25 Sep 2018 15:53:48 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     X86 ML <x86@...nel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        nhorman@...hat.com, npmccallum@...hat.com,
        "Ayoun, Serge" <serge.ayoun@...el.com>, shay.katz-zamir@...el.com,
        linux-sgx@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 09/19] x86/mm: x86/sgx: Signal SEGV_SGXERR for #PFs w/ PF_SGX

Minor nit:

On Tue, Sep 25, 2018 at 6:12 AM Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
>
> From: Sean Christopherson <sean.j.christopherson@...el.com>
>

> by (c) as the kernel doesn't really have any other reasonable option,
> e.g. we could kill the task or panic, but neither is warranted.

Not killing the task is quite nice, but...

> +       /*
> +        * Access is blocked by the Enclave Page Cache Map (EPCM),
> +        * i.e. the access is allowed by the PTE but not the EPCM.
> +        * This usually happens when the EPCM is yanked out from
> +        * under us, e.g. by hardware after a suspend/resume cycle.
> +        * In any case, there is nothing that can be done by the
> +        * kernel to resolve the fault (short of killing the task).

Maybe s/killing the task/sending a signal/?

--Andy