linux-kernel - Re: [PATCH v6 3/5] x86/sgx: Define error codes for use by ENCLS[EUPDATESVN]

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Message-ID: <aDCalY6qL0lhBiwo@kernel.org>
Date: Fri, 23 May 2025 18:56:05 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Elena Reshetova <elena.reshetova@...el.com>
Cc: dave.hansen@...el.com, seanjc@...gle.com, kai.huang@...el.com,
	mingo@...nel.org, linux-sgx@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	asit.k.mallick@...el.com, vincent.r.scarlata@...el.com,
	chongc@...gle.com, erdemaktas@...gle.com, vannapurve@...gle.com,
	dionnaglaze@...gle.com, bondarn@...gle.com, scott.raynor@...el.com
Subject: Re: [PATCH v6 3/5] x86/sgx: Define error codes for use by
 ENCLS[EUPDATESVN]

On Thu, May 22, 2025 at 12:21:36PM +0300, Elena Reshetova wrote:
> Add error codes for ENCLS[EUPDATESVN], then SGX CPUSVN update
> process can know the execution state of EUPDATESVN and notify
> userspace.
> 
> Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> ---
>  arch/x86/include/asm/sgx.h | 37 ++++++++++++++++++++++---------------
>  1 file changed, 22 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
> index 6a0069761508..1abf1461fab6 100644
> --- a/arch/x86/include/asm/sgx.h
> +++ b/arch/x86/include/asm/sgx.h
> @@ -28,21 +28,22 @@
>  #define SGX_CPUID_EPC_MASK	GENMASK(3, 0)
>  
>  enum sgx_encls_function {
> -	ECREATE	= 0x00,
> -	EADD	= 0x01,
> -	EINIT	= 0x02,
> -	EREMOVE	= 0x03,
> -	EDGBRD	= 0x04,
> -	EDGBWR	= 0x05,
> -	EEXTEND	= 0x06,
> -	ELDU	= 0x08,
> -	EBLOCK	= 0x09,
> -	EPA	= 0x0A,
> -	EWB	= 0x0B,
> -	ETRACK	= 0x0C,
> -	EAUG	= 0x0D,
> -	EMODPR	= 0x0E,
> -	EMODT	= 0x0F,
> +	ECREATE		= 0x00,
> +	EADD		= 0x01,
> +	EINIT		= 0x02,
> +	EREMOVE		= 0x03,
> +	EDGBRD		= 0x04,
> +	EDGBWR		= 0x05,
> +	EEXTEND		= 0x06,
> +	ELDU		= 0x08,
> +	EBLOCK		= 0x09,
> +	EPA		= 0x0A,
> +	EWB		= 0x0B,
> +	ETRACK		= 0x0C,
> +	EAUG		= 0x0D,
> +	EMODPR		= 0x0E,
> +	EMODT		= 0x0F,
> +	EUPDATESVN	= 0x18,
>  };
>  
>  /**
> @@ -73,6 +74,10 @@ enum sgx_encls_function {
>   *				public key does not match IA32_SGXLEPUBKEYHASH.
>   * %SGX_PAGE_NOT_MODIFIABLE:	The EPC page cannot be modified because it
>   *				is in the PENDING or MODIFIED state.
> + * %SGX_INSUFFICIENT_ENTROPY:	Insufficient entropy in RNG.
> + * %SGX_NO_UPDATE:		EUPDATESVN was successful, but CPUSVN was not
> + *				updated because current SVN was not newer than
> + *				CPUSVN.
>   * %SGX_UNMASKED_EVENT:		An unmasked event, e.g. INTR, was received
>   */
>  enum sgx_return_code {
> @@ -81,6 +86,8 @@ enum sgx_return_code {
>  	SGX_CHILD_PRESENT		= 13,
>  	SGX_INVALID_EINITTOKEN		= 16,
>  	SGX_PAGE_NOT_MODIFIABLE		= 20,
> +	SGX_INSUFFICIENT_ENTROPY	= 29,
> +	SGX_NO_UPDATE				= 31,
>  	SGX_UNMASKED_EVENT		= 128,
>  };
>  
> -- 
> 2.45.2
> 

Saving reviewed-by up until head of the series looks good to me but
in principle this is as good as it can get ;-)

BR, Jarkko