linux-kernel - Re: [PATCH v22 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF

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Date:   Wed, 25 Sep 2019 17:16:09 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, josh@...htriplett.org, luto@...nel.org,
        kai.huang@...el.com, rientjes@...gle.com, cedric.xing@...el.com,
        Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v22 03/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX

On Tue, Sep 24, 2019 at 06:04:42PM +0200, Borislav Petkov wrote:
> > +	/*
> > +	 * 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, software, i.e. the kernel, can't
> > +	 * fix the source of the fault as the EPCM can't be directly modified
> > +	 * by software.  Handle the fault as an access error in order to signal
> > +	 * userspace, e.g. so that userspace can rebuild their enclave(s), even
> 
> s/, e.g.//

Thanks I fixed this in my tree. Also, quite many sentences seem that have
two spacebars after the end of sentence. I fixed those too.

/Jarkko