linux-kernel - Re: [PATCH v30 07/20] x86/sgx: Enumerate and track EPC sections

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Message-ID: <20200528073628.GA291560@linux.intel.com>
Date:   Thu, 28 May 2020 10:36:28 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.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, puiterwijk@...hat.com,
        Serge Ayoun <serge.ayoun@...el.com>,
        Jethro Beekman <jethro@...tanix.com>
Subject: Re: [PATCH v30 07/20] x86/sgx: Enumerate and track EPC sections

On Wed, May 27, 2020 at 10:35:09PM +0200, Borislav Petkov wrote:
 
> > One idea would be to provide a Kconfig a la NR_CPUS or NODES_SHIFT.  I.e.
> > carve out the bits in sgx_epc_page_desc to allow up to N sections, but let
> > the user limit the number of sections to recoup the unused memory.
> 
> I'd prefer a good estimate of a highest value, say 8 bits, which should
> suffice for the foreseeable future. That's the simplest thing to do and
> our Kconfig symbols space is an abomination of gazillion symbols.

OK, will do.

/Jarkko