linux-kernel - Re: [PATCH v27 04/22] x86/sgx: Add SGX microarchitectural data structures

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Date:   Mon, 2 Mar 2020 16:39:32 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     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, bp@...en8.de,
        josh@...htriplett.org, luto@...nel.org, kai.huang@...el.com,
        rientjes@...gle.com, cedric.xing@...el.com, puiterwijk@...hat.com
Subject: Re: [PATCH v27 04/22] x86/sgx: Add SGX microarchitectural data
 structures

On Sun, Feb 23, 2020 at 07:25:41PM +0200, Jarkko Sakkinen wrote:
> Define the SGX microarchitectural data structures used by various SGX
> opcodes. This is not an exhaustive representation of all SGX data
> structures but only those needed by the kernel.
> 
> The data structures are described in:
> 
>   Intel SDM: 37.6 INTEL® SGX DATA STRUCTURES OVERVIEW
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---

...

> +#define SGX_SSA_GPRS_SIZE		182

SSA GPRs size is 184.  Per table 37.9 in the SDM:

  Field    OFFSET (Bytes)    Size (Bytes)

  GSBASE   176               8

Reported by a third party, I'm just the messenger and not that good at math :-).