linux-kernel - Re: [PATCH v22 06/24] x86/sgx: Add SGX microarchitectural data structures

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Date:   Tue, 1 Oct 2019 23:39:52 +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
Subject: Re: [PATCH v22 06/24] x86/sgx: Add SGX microarchitectural data
 structures

On Fri, Sep 27, 2019 at 06:27:35PM +0200, Borislav Petkov wrote:
> > +#define SGX_ATTR_RESERVED_MASK	(BIT_ULL(3) | BIT_ULL(7) | GENMASK_ULL(63, 8))
> 
> Looking how bit 7 is part of the reserved mask but you have it above
> as SGX_ATTR_KSS too. Bit 6, OTOH, is not mentioned anywhere and it
> very much looks like you need to have BIT_ULL(6) above as part of the
> reserved mask instead of bit 7.
> 
> Hmmm?

Correct. This a regression. The reserved bit really should be 6 as
stated in:

  Table 37-3.  Layout of ATTRIBUTES Structure

Thank you.

/Jarkko