linux-kernel - Re: [PATCH v32 08/21] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections

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Date:   Mon, 1 Jun 2020 08:15:17 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Serge Ayoun <serge.ayoun@...el.com>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v32 08/21] x86/sgx: Initialize metadata for Enclave Page
 Cache (EPC) sections

Hi,

Sorry I didn't respond to v31 with this so that it could
have been fixed in v32.

On 6/1/20 12:52 AM, Jarkko Sakkinen wrote:
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 2d3f963fd6f1..d246c6071e8d 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1948,6 +1948,22 @@ config X86_INTEL_TSX_MODE_AUTO
>  	  side channel attacks- equals the tsx=auto command line parameter.
>  endchoice
>  
> +config INTEL_SGX
> +	bool "Intel SGX"
> +	depends on X86_64 && CPU_SUP_INTEL
> +	depends on CRYPTO=y
> +	depends on CRYPTO_SHA256=y
> +	select SRCU
> +	select MMU_NOTIFIER
> +	help
> +	  Intel(R) SGX is a set of CPU instructions that can be used by
> +	  applications to set aside private regions of code and data, referred
> +	  to as enclaves. An enclave's private memory can only be accessed by
> +	  code running within the enclave. Accesses from outside the enclave,
> +	  including other enclaves, are disallowed by hardware.

Either the prompt
	bool "Intel SGX"
or the help text should tell us what SGX means.
(Software Guard eXtensions)

> +
> +	  If unsure, say N.
> +
>  config EFI
>  	bool "EFI runtime service support"
>  	depends on ACPI

thanks.
-- 
~Randy